Patent Application
20220297265
There has already been proposed in DE 10 2010 003 616 A1 an abrasion tool device having at least one backing unit, and having at least one fastening unit for detachably fastening an abrasive to the backing unit, wherein the backing unit comprises at least one backing element on which the abrasive is arranged via the fastening unit.
The invention is based on an abrasion tool device, in particular an abrasion plate, having at least one backing unit, in particular a support pad or a support plate, and having at least one fastening unit for detachably fastening an abrasive, in particular an abrasive paper or an abrasive fleece, to the backing unit, wherein the backing unit comprises at least one backing element on which the abrasive is arranged via the fastening unit.
It is proposed that the backing element be made from a material having a melting temperature of more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., very particularly preferably more than 240° C., and particularly advantageously preferably more than 250° C. Preferably, the material from which the backing element is formed has a melting temperature that in particular is less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and particularly advantageously preferably less than 260° C. It is also conceivable for the material from which the backing element is formed to have a melting temperature of more than 350° C. Preferably, the material from which the backing element is formed has a melting temperature that is less than 350° C. and greater than 180° C., in particular less than 300° C. and greater than 200° C., preferably less than 280° C. and greater than 220° C., particularly preferably less than 280° C. and greater than 240° C., and very particularly preferably less than 280° C. and greater than 250° C. Preferably, the backing element is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature of more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., very particularly preferably more than 240° C., and particularly advantageously preferably more than 250° C. Preferably, the backing element is at least mainly, in particular at least substantially entirely, is made from the material having a melting temperature of less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and particularly advantageously preferably less than 260° C. Preferably, the backing element is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that is less than 350° C. and greater than 180° C., in particular less than 300° C. and greater than 200° C., preferably less than 280° C. and greater than 220° C., particularly preferably less than 280° C. and greater than 240° C., and very particularly preferably less than 280° C. and greater than 250° C. That “the backing element is made at least substantially entirely from a material” is to be understood to mean, in particular, that the backing element is made at least 90% by volume, preferably at least 95% by volume, and particularly preferably at least 98% by volume, from the material. In particular, the material of the backing element is realized, for example, as a metal, in particular a metal alloy, as a ceramic, as a composite material and/or as a plastic. The backing element is preferably, in particular at least mainly, plate-like, with in particular two at least partially opposite sides of the backing element aligned parallel to a plane of main extent of the backing element. A “plane of main extent” of a component, in particular of the backing element, is to be understood to mean, in particular, a plane that is parallel to a largest lateral face of a smallest notional cuboid that only just completely encloses the unit. Preferably, the backing element has at least one contact face that is realized, in particular at least mainly, as a flat face. Preferably, the fastening unit is arranged on the backing element via the contact face. In particular, the contact face is aligned parallel to the plane of main extent of the backing element.
In particular, the abrasion tool device comprises at least one connection region for connecting at least the abrasion tool device, in particular at least the backing unit and the fastening unit, to an abrasion power tool, in particular a multifunction power tool that can be driven in an oscillating manner. Preferably, the contact face is arranged on a side of the backing unit, in particular of the backing element, that faces away from the connection region. It is also conceivable, however, for the contact face to be arranged on a side of the backing element that faces toward the connection region. It is conceivable for the connection region to be made from a material having a melting temperature of at least more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., very particularly preferably more than 240° C., and particularly advantageously preferably more than 250° C. In particular, it is conceivable for the connection region to be made from a material having a melting temperature of less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and very particularly preferably less than 260° C. Preferably, the connection region is made from a material having a melting temperature that is less than 350° C. and greater than 180° C., in particular less than 300° C. and greater than 200° C., preferably less than 280° C. and greater than 220° C., particularly preferably less than 280° C. and greater than 240° C., and very particularly preferably less than 280° C. and greater than 250° C. It is conceivable for the connection region to be made from the same material as the backing element. Preferably, the connection region is connected at least in a rotationally fixed manner to the backing unit, in particular the backing element, in particular is realized as a single piece with the backing unit, in particular the backing element. “As a single piece” is to be understood to mean, in particular, connected at least in a materially bonded manner, for example by a welding process, an adhesive process, an injection process and/or another process considered appropriate by persons skilled in the art, and/or, advantageously, formed in one piece such as, for example, by being produced from a casting and/or by being produced in a single or multi-component injection process and, advantageously, from a single blank. It is conceivable for the connection region to be of a multipart design. In particular, the abrasion tool device comprises at least one axis of motion about which at least the backing unit, in particular the backing element, the fastening unit and/or the abrasive can be moved, at least partially, in particular can be driven by means of a drive unit of the abrasion power tool. Preferably, the backing element is arranged transversely, in particular perpendicularly, to the axis of motion, the plane of main extent of the backing element being in particular perpendicular to the axis of motion. That a straight line and/or a plane, in particular the plane of main extent of the backing element, is aligned “perpendicularly” to a further straight line or a further plane, in particular the axis of motion, is to be understood to mean, in particular, that the straight line or plane and the further straight line or further plane, in particular as viewed in a projection plane, enclose an angle of 90°, and the angle has a maximum deviation of in particular less than 8°, advantageously less than 5° and particularly advantageously less than 2°. In particular, production tolerances must be taken into account in arrangements of components, in perpendicular to each other. Preferably, the alignment of the contact face is perpendicular to the axis of motion. Preferably, the connection region and/or the backing element delimit at least one form-fitting recess, in particular a multiplicity of form-fitting recesses, via which at least the backing unit and/or the connection region can be fastened to the abrasion power tool, in particular to a tool receiver of the abrasion power tool. Preferably, the connection region is designed for connection to a rotary oscillation drive of the abrasion power tool. In particular, the abrasion tool device is designed to be moved back and forth in an oscillatory manner about the axis of motion by the rotary oscillation drive, at a frequency of 5000 to 25000 oscillations per minute and with a swivel angle of 0.5° to 7°. Preferably, when the abrasion tool device is moving in an oscillatory manner about the axis of motion, the abrasion tool device is acted upon in a constant manner in opposite directions about the axis of motion. In particular, a large amount of frictional heat is produced when the abrasion tool device is moving in an oscillatory manner with the swivel angle, in particular the swivel angle described above, in particular due to the fact that the abrasive is being moved over a small surface area, preferably compared to a larger swivel angle.
Preferably, the backing unit has exactly one, in particular plate-like, backing element. It is also conceivable, however, for the backing unit to have more than one backing element, the backing elements being in particular connected to each other mechanically or in a materially bonded manner. Preferably, the backing element delimits at least one recess, in particular a multiplicity of recesses, designed to dissipate heat from the abrasive and/or the backing element to an environment surrounding the backing unit. Preferably, the backing element is realized in such a manner that the recesses extend from a side on which the contact face is arranged, preferably over a maximum thickness of the backing element, to a side of the backing element that faces toward the connection region. In particular, in a design of the abrasion tool device in which the backing element delimits a multiplicity of recesses, it is conceivable for the backing element to be realized in such a manner that the recesses are arranged with an even distribution over the contact face of the backing element, in particular around the connection region and/or the axis of motion. In particular, the backing element has at least one face that delimits the recess. Preferably, the face delimiting the recess is arranged, in particular at least partially, perpendicularly to the contact face. It is also conceivable, however, for the face delimiting the recess to be arranged, in particular at least partially, transversely to the contact face and/or the axis of motion. It is conceivable for the faces of the backing element that delimit the recesses, in particular as viewed in the plane of main extent of the backing element, to be of an at least identical basic shape. Preferably, the recess delimited by the backing element is designed at least to increase a diffusion of heat generated during an abrasion process, in particular in a processing region of the abrasive, from the contact face to a side of the backing unit, in particular of the backing element, that faces away from the fastening unit, preferably as compared with a design of the backing element in which the backing element is realized without recesses.
Owing to the design of the abrasion tool device according to the invention, an advantageously high degree of robustness and stability becomes possible, in particular with regard to temperature-related loads acting upon the backing unit, in particular the backing element. An advantageously high processing accuracy can be achieved, in particular because it is possible to achieve an advantageously high resistance of the backing element, for example temperature-related deformations and/or damage. It is thus possible to ensure an advantageously permanently homogeneous processing surface. It is advantageously possible to prevent wear phenomena, for example partial melting, of the backing element, which can occur due to the generation of a large amount of heat, in particular in the case of relatively high contact pressure and/or relatively long periods of use. It is thus possible, advantageously, to ensure that the abrasive is securely connected to the backing element.
It is furthermore proposed that the fastening unit comprise at least one fastening element, for fastening the abrasive to the backing unit, in particular to the backing element, that is at least mainly, or at least substantially entirely, made from a material having a melting temperature of more than 160° C., in particular more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., very preferably more than 240° C., and particularly advantageously preferably more than 250° C. Preferably, the fastening element is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that in particular is less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and very particularly preferably less than 260° C. Preferably, the fastening element is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that is less than 350° C. and greater than 160° C., in particular less than 300° C. and greater than 180° C., preferably less than 280° C. and greater than 200° C., particularly preferably less than 280° C. and greater than 220° C., and very particularly preferably less than 280° C. and greater than 240° C. Preferably, the fastening element of the fastening unit is made from a material different from that of the backing element. For example, the fastening element of the fastening unit is realized as a hook-and-loop fastening, as an adhesive bonded joint, in particular a re-releasable adhesive bonded joint, as a hook, as a clip, as a vacuum element or the like. Preferably, the fastening element of the fastening unit has a basic shape, as viewed in a plane of main extent of the fastening element, at least an outer contour of the basic shape of the fastening element corresponding to an outer contour of the basic shape of the backing element. Preferably, the fastening element of the fastening unit is realized so as to correspond to a fastening element of the abrasive. In particular in a design of the abrasion tool device in which the fastening element of the fastening unit is realized as a part of a hook-and-loop fastening, the fastening element of the fastening unit is preferably, in particular at least mainly, made from a fiber-reinforced thermoplastic. In particular in a design of the abrasion tool device in which the fastening element is of a design other than an adhesive bonded joint, the fastening unit preferably has at least one adhesive element that is designed to fasten the fastening element to the backing element. An advantageously high degree of robustness and stability of the fastening element of the fastening unit becomes possible, in particular with regard to temperature-related loads acting upon the fastening element of the fastening unit. An advantageously secure connection of the abrasive to the backing unit, in particular to the backing element, can be achieved.
It is also proposed that the fastening unit comprise at least one, in particular the aforementioned, adhesive element, that is designed to replaceably fasten the fastening unit, in particular a fastening element, preferably the aforementioned, of the fastening unit that is realized as a hook-and-loop fastening, to the backing element. The adhesive element is realized, for example, as a bonding agent. Preferably, the adhesive element is realized so as to be re-releasable. Preferably, the adhesive element is designed to connect the fastening element to the backing element in a materially bonded manner. Preferably, the adhesive element extends at least mainly over a face of the fastening element that faces toward the backing element and/or over a face of the backing element that faces toward the fastening element. In particular, the adhesive element is arranged with an even distribution over the face of the fastening element that faces toward the backing element and/or over the face of the backing element that faces toward the fastening element. Preferably, the adhesive element is arranged, on the backing element, on the contact face of the backing element. Particularly preferably, the adhesive element is made from a material having a melting temperature of more than 160° C., in particular more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., and very particularly preferably more than 240° C. Preferably, the adhesive element is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that in particular is less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and very particularly preferably less than 260° C. Preferably, the adhesive element is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that is less than 350° C. and greater than 160° C., in particular less than 300° C. and greater than 180° C., preferably less than 280° C. and greater than 200° C., particularly preferably less than 280° C. and greater than 220° C., and very particularly preferably less than 280° C. and greater than 240° C. Preferably, the adhesive element has an at least substantially unchanged holding force, in particular bonding force, at a temperature that is less than the melting temperature of the material of the adhesive element. An advantageously secure connection of the fastening element to the backing element can be ensured. An advantageously secure connection of the abrasive to the backing element can be ensured, in particular because the fastening element of the fastening unit can be changed, for example following wear due to temperature or attrition. In particular, owing to the replaceable fastening of the fastening element, use of a plurality of different abrasives in combination becomes possible. Advantageously low maintenance costs can be achieved, in particular because the fastening element can be changed independently of the backing element, enabling the backing element to be reused.
It is additionally proposed that the backing unit, in particular the backing element, have a maximum thickness of at most 5 mm, preferably at most 3 mm, more preferably at most 2 mm, particularly preferably at most 1 mm and very particularly preferably at most 0.8 mm, perpendicularly to a, in particular the aforementioned, contact face of the backing unit with the fastening unit. Preferably, the backing element has a flatness on the contact face of maximally 8%, preferably maximally 4%, and particularly preferably maximally 2% of the maximum thickness. In particular, the backing element is realized in such a manner that the maximum thickness extends from the contact face to a bearing contact surface of the backing element at which the connection region bears against the backing element. It is conceivable for the fastening unit, in particular the fastening element of the fastening unit, to have a maximum thickness of at most 4 mm, preferably at most 3 mm, and particularly preferably at most 2 mm, perpendicularly to a face of the fastening element of the fastening unit that faces toward the contact face of the backing element. In particular, the adhesive element has a maximum thickness of at most 3 mm, preferably at most 2 mm, and particularly preferably at most 1 mm, perpendicularly to a face of the adhesive element that faces toward the contact face of the backing element. An advantageously compact abrasion tool device becomes possible. In particular, due to the low maximum thickness of the backing unit, in particular of the backing element, an advantageously high processing accuracy can be achieved.
It is also proposed that the abrasion tool device have at least one heat transfer coating, which is arranged between the backing unit, in particular the backing element, and the fastening unit, preferably on the contact face, and/or is arranged on a side of the fastening unit, in particular of the fastening element of the fastening unit, that faces away from the backing unit, in particular the backing element. A “heat transfer coating” is to be understood to mean, in particular, a coating designed to increase an amount of heat removed via a component, in particular the backing unit and/or the fastening unit of the abrasion tool device, as compared with an identical, uncoated component. Preferably, the heat transfer coating of the abrasion tool device bears at least substantially with full surface contact against the contact face and/or against the side of the fastening unit, in particular of the fastening element of the fastening unit, that faces away from the backing unit, in particular the backing element. That a component, in particular the heat transfer coating of the abrasion tool device, bears “at least substantially with full surface contact” against another component, in particular the backing unit, the backing element, the fastening unit and/or the fastening element of the fastening unit, is to be understood to mean, in particular, that the component has at least one face that bears with at least 90%, preferably at least 84% and particularly preferably at least 98% contact against the other component. Preferably, the heat transfer coating of the abrasion tool device has a greater thermal conduction characteristic than the backing unit, in particular the backing element, and/or the fastening unit, in particular the fastening element of the fastening unit. A “thermal conduction characteristic” is to be understood to mean, in particular, a characteristic of a component, in particular of the heat transfer coating, of the backing unit and/or of the fastening unit, that influences a thermal conductivity of the component. Preferably, the thermal conduction characteristic is proportional to an amount of heat that is removed via the component per time interval. In particular, the thermal conduction characteristic is realized as a thermal conductivity, in particular a thermal conduction coefficient, as an equivalent thermal conductivity, as an equivalent thermal resistance, as a length-related thermal transmission coefficient, as a point-related thermal transmission coefficient or the like. For example, the heat transfer coating is made at least partially from a metal, in particular a seminoble metal, preferably copper, a noble metal and/or an alkaline earth metal, a carbon compound, in particular graphene, diamond, and/or a graphite close to graphene or the like. Preferably, the heat transfer coating is realized as a thin layer, in particular a flat layer, the heat transfer coating having in particular a maximum thickness of at most 1 mm, preferably at most 0.5 mm and particularly preferably at most 0.3 mm. It is also conceivable for the heat transfer coating to be realized as a structure distributed, in particular evenly, over the contact face. Alternatively or additionally it is conceivable for the heat transfer coating to be vapor-deposited onto the contact face and/or the fastening element of the fastening unit, or applied by means of an electrolysis process. An advantageously high degree of robustness and stability of the abrasion tool device becomes possible, in particular because heat generated on the abrasive can be dissipated advantageously rapidly via the heat transfer coating. An advantageously high level of thermal conduction, thermal convection and/or thermal diffusion can be achieved in abrasion applications.
It is furthermore proposed that the fastening unit comprise at least one, in particular the aforementioned, fastening element, wherein the fastening element of the fastening unit bears, preferably via the adhesive element, at least substantially with full surface contact against the backing element, in particular the contact face. Preferably, the fastening unit, in particular the fastening element of the fastening unit, delimits cut-outs that are designed to dissipate heat from the abrasive and/or the backing unit to an environment surrounding the fastening unit, in particular the fastening element of the fastening unit. Preferably, the fastening unit, in particular the fastening element of the fastening unit, is realized in such a manner that the cut-outs extend from a side on which the fastening element of the fastening unit is arranged on the contact face, over a maximum thickness of the fastening unit, in particular of the fastening element of the fastening unit, to a side of the fastening unit, in particular of the fastening element of the fastening unit, that faces toward the abrasive. It is conceivable for edges of the fastening element of the fastening unit that delimit the cut-outs to at least partially overlap and/or border the recesses and/or form-fitting recesses delimited by the backing element, as viewed along the contact face. It is conceivable for the fastening element of the fastening unit and the backing element to be realized in such a manner that the edges of the fastening element of the fastening unit delimiting the cut-outs, and edges of the backing element delimiting the recesses and/or form-fitting recesses, are arranged at least mainly congruently, as viewed along the contact face. An advantageously high degree of robustness and stability of the abrasion tool device becomes possible, in particular because an advantageously secure connection of the fastening element of the fastening unit and of the backing element can be achieved.
It is furthermore proposed that the abrasion tool device comprise at least one protective unit, which is arranged on the backing element and is designed, in particular during an abrasion operation, to protect a workpiece, the backing element or an external unit, in particular from damage, and/or to damp an impact, in particular a direct impact, of the backing element on the workpiece or on the external unit. Preferably, the protective unit has at least one protective element that is arranged in particular on an outer side of the backing element, in particular on an outer edge of the backing element and/or on an outer face of the backing element that faces away from the abrasive and/or the contact face. In particular, the protective element, in particular as viewed perpendicularly to the plane of main extent of the backing element, has an outer edge or face that has a greater minimum distance than has the outer edge of the backing element from the axis of motion. Preferably, the protective element is arranged at a distance from the contact face and/or the abrasive. Preferably, the outer face of the backing element is oriented at least mainly transversely, in particular perpendicularly, or parallel to the plane of main extent of the backing element. In particular in a design in which the outer face of the backing element is oriented transversely, in particular perpendicularly, to the plane of main extent of the backing element, the outer face of the backing element is arranged, in particular at least mainly, around the axis of motion. In particular, the outer edge is arranged within the plane of main extent of the backing element and extends at least substantially entirely around the axis of motion. In particular, the external unit is realized as an object delimiting the workpiece, in particular the workpiece to be processed, such as, for example, a wall or a ceiling, a body part of a user or the like. Preferably, the outer edge and/or the outer face of the backing element are/is arranged at a distance from the contact face. It is also conceivable, however, for the outer face of the backing element to at least partially delimit the contact face. Preferably, the protective element is arranged, along the outer edge and/or the outer face of the backing element, at least mainly, in particular at least substantially entirely, around the axis of motion. It is conceivable for the protective element, in particular as viewed perpendicularly to the plane of main extent of the backing element, to at least partially enclose the backing element in a region of the outer edge, the protective element in particular encompassing the outer edge of the backing element. Particularly preferably, the protective element, as viewed perpendicularly to the plane of main extent of the backing element, is arranged on the backing element at least mainly, in particular entirely, on a side of a plane of the backing unit that extends along the contact face and/or along the outer face of the backing element that is aligned parallel to the contact face. In particular in a design of the protective unit in which the protective element encloses and/or encompasses the outer edge, the protective element preferably extends at least partially, in particular at least mainly, over a maximum thickness of the backing element at the outer edge. It is conceivable for the protective element to bear exclusively against the outer face of the backing element that is aligned transversely, in particular perpendicularly, to the contact face, or against the outer face of the backing element that is aligned parallel to the contact face. In particular in a design of the protective unit in which the protective element bears exclusively against the outer face of the backing element that is aligned parallel to the contact face, the protective element preferably extends out from the axis of motion, beyond the outer edge of the backing element. Preferably, the protective element, in particular as viewed perpendicularly to the plane of main extent of the backing element, has a maximum thickness of in particular at least 0.3 mm, preferably at least 0.5 mm, preferably at least 0.8 mm and particularly preferably at least 1 mm. Preferably, a minimum thickness of the protective element is at most 1 cm, preferably at most 0.5 mm and preferably at most 3 mm. In particular, the protective element bears against the backing element along the outer edge and/or the outer face of the backing element. Preferably, the protective element, in particular as viewed perpendicularly to the plane of main extent of the backing element, has an outer edge or face that has a greater minimum distance than has the outer edge of the backing element from the axis of motion. Preferably, the protective element is connected as a single piece to the backing element, in particular by means of an adhesive bonded joint, or is fastened to the backing element by means of a form-fitting and/or force-fitting connection. For example, it is conceivable for the backing element to have, in a region of the outer edge and/or the outer face of the backing element, at least one or more form-fitting and/or force-fitting extensions designed to fasten the protective element. Particularly preferably, the protective unit, in particular the protective element, is made from a material having a melting temperature of more than 160° C., in particular more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., and very particularly preferably more than 240° C. Preferably, the protective unit, in particular the protective element, is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that in particular is less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and very particularly preferably less than 260° C. Preferably, the protective unit, in particular the protective element, is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that is less than 350° C. and greater than 160° C., in particular less than 300° C. and greater than 180° C., preferably less than 280° C. and greater than 200° C., particularly preferably less than 280° C. and greater than 220° C., and very particularly preferably less than 280° C. and greater than 240° C.
Preferably the protective unit, in particular the protective element, is made from a plastic, in particular a thermoplastic or a polyamide, and/or of a rubber. For example, the protective unit, in particular the protective element, is made from a glass-fiber-reinforced plastic, from a partially aromatic polyamide, in particular of the Grivory GV-5H type, or from polyphenylene sulfide. It is conceivable, for example, for the protective element to be realized as a rubber lip. Preferably, the protective element is made from a material that has a lesser stiffness than the backing element, in particular the material from which the backing element is made. It is conceivable for the protective unit, in particular the protective element, to be realized so as to be replaceable, in particular the protective unit, in particular the protective element, being separable from the backing element without leaving any residue and/or non-destructively. Alternatively, it is conceivable for the protective unit to comprise more than one protective element, arranged along the outer edge and/or the outer face of the backing element. In particular in a design in which the protective unit has more than one protective element, it is conceivable for the protective elements to only partially cover the outer edge and/or the outer face of the backing element, for example in a region of corners of a basic shape of the backing element. Unintentional damage to the backing element, in particular at the outer edge and/or the outer face of the backing element, can advantageously be prevented in an abrasion operation. Advantageously, unintentional damage, in particular scratching or staining, of the workpiece or of the external unit can be prevented.
It is additionally proposed that the protective unit, in particular a protective element of the protective unit, have a melting temperature of more than 220° C., preferably more than 240° C., and more preferably more than 260° C. Unintentional damage to the backing element, in particular at the outer edge and/or the outer face of the backing element, due to temperature-related effects can advantageously be prevented in an abrasion operation. Unintentional damage to the workpiece or the external unit, in particular melting or rubbing-off, can advantageously be prevented.
It is also proposed that the protective unit comprise at least one, in particular the aforementioned, protective element, wherein the protective element, as viewed along a central axis of the backing element and/or of the protective element, has an outer edge, in particular the aforementioned, that has a greater minimum distance than has an outer edge, in particular the aforementioned, of the backing element from the central axis of the backing element. The protective element can advantageously prevent an unintentional collision of the outer edge of the backing element against the workpiece or against an object surrounding the workpiece. Advantageously low maintenance costs can be achieved, in particular because the protective element can be replaced and/or made from a less expensive material than the backing element. In particular, the axis of motion comprises the central axis of the backing element. Preferably, the central axis of the backing element and/or of the protective element, as viewed in the plane of main extent of the backing element, comprises a geometric mid-point of a shape of the backing element. Preferably, the central axis of the backing element and/or of the protective element is arranged at least substantially perpendicularly to the plane of main extent of the backing element. Preferably, the outer edge of the backing element, as viewed in the plane of main extent of the backing element, is part of an outer contour of the backing element.
It is furthermore proposed that the protective unit comprise at least one, in particular the aforementioned, protective element that has at least one outer face which, at least substantially perpendicularly to a central axis, in particular the aforementioned, of the backing element and/or of the protective element, has a greater maximum distance than has an outer edge, in particular the aforementioned, of the backing element from the central axis, and which, in particular in at least one state in which the protective element is arranged on the backing element, as viewed in a sectional plane comprising the central axis of the backing element and/or of the protective element, is at least substantially inclined relative to the central axis of the backing element and/or of the protective element. It is advantageously possible to prevent an unintentional collision of the protective element against the workpiece or against an object surrounding the workpiece during tilting of the abrasion power tool and/or of the abrasion tool device attached thereto. Preferably, the outer face of the protective element is at least substantially inclined with respect to the contact face of the backing element. “Substantially inclined” is to be understood to mean, in particular, an alignment of a straight line, a plane or a direction, in particular at least one plane that is tangential to the outer face of the protective element, as viewed in a sectional plane of the protective element that comprises the central axis, relative to another straight line, another plane or a reference direction, in particular the central axis, a straight line that is at least substantially parallel to the central axis and/or the contact face, the straight line, the plane or the direction with the other straight line, the other plane or the reference direction, in particular as viewed in a projection plane, spanning an angle from an angular range of from 8° to 92°, preferably from 15° to 85°, and more preferably from 20° to 80°. In particular, the at least substantially inclined orientation, in particular of the outer face of the protective element and of the central axis, is to be understood to mean an orientation different from a parallel orientation and from a perpendicular orientation. Preferably, the outer edge of the protective element, in particular as viewed in a plane of main extent of the protective element, delimits the outer face of the protective element at least partially, in particular at least substantially entirely, around the central axis of the backing element and/or a central axis of the protective element. Preferably, the central axis of the protective element, in at least one state in which the protective element is arranged on the backing element, comprises the central axis and/or the axis of motion of the backing element. In particular, the central axis of the protective element is arranged at least substantially perpendicularly to the plane of main extent of the protective element. Preferably, the plane of main extent of the protective element, in at least one state in which the protective element is arranged on the backing element, is arranged at least substantially parallel to the plane of main extent of the backing element. Preferably, the protective element has a connection direction, the protective element being designed to be arranged on, in particular fastened to, the backing element by a movement in the connection direction. Preferably, the connection direction is arranged at least substantially parallel to the central axis of the backing element and/or of the protective element. In particular, the connection direction is at least substantially perpendicular to the plane of main extent of the protective element. Preferably, the outer face of the protective element has, relative to the central axis of the backing element and/or of the protective element, an angle from an angular range of from 8° to 92°, preferably from 15° to 85° and more preferably from 20° to 80°, that is spanned, in particular in the connection direction, by a, in particular virtual, point of intersection of a straight line, that extends at least substantially parallel to the central axis and through the outer edge of the protective element, and by the outer face of the protective element. Alternatively or additionally, the protective element has at least one further outer face that has a greater minimum distance than has the outer edge of the backing element from the central axis of the backing element and that, in particular in at least one state in which the protective element is arranged on the backing element, as viewed in a sectional plane comprising the central axis of the backing element, is at least substantially inclined relative to the central axis of the backing element. Preferably, the outer face of the protective element has, relative to the central axis of the backing element and/or of the protective element, an angle from an angular range of from 8° to 92°, preferably from 15° to 85° and more preferably from 20° to 80°, that is spanned, in particular contrary to the connection direction, by a, in particular virtual, point of intersection of a straight line, that extends at least substantially parallel to the central axis and through the outer edge of the protective element, and by the further outer face. Preferably, the further outer face of the protective element is arranged on a side of the protective element that faces away from the backing element, in particular the contact face. In particular, the further outer face of the protective element is arranged on an underside of the protective element. Preferably, the further outer face of the protective element, as viewed at least substantially perpendicularly to the central axis of the backing element and/or of the protective element, delimits a contour of the protective element, in particular a contour delimiting the protective element in the connection direction. Preferably, the outer face and the further outer face of the protective element are arranged at a distance from each other on the protective element. It is also conceivable, however, for the outer face and the further outer face of the protective element to at least partially delimit each other, in particular on one side in each case. Preferably, the outer face and/or the further outer face of the protective element are/is realized with a flat surface. It is also conceivable, however, for the outer face and/or the further outer face of the protective element to be curved.
It is also proposed that the protective unit comprise at least one, in particular the aforementioned, protective element, that extends, at least substantially perpendicularly to a, in particular the aforementioned, central axis of the backing element and/or of the protective element, at least mainly, in particular at least substantially entirely, over a maximum extent of the backing element. An advantageously stable and robust design of the protective element becomes possible, in particular because the protective element can be advantageously supported over the maximum extent by the backing element. Advantageously extensive protection of the backing element by the protective unit can be achieved. Preferably, the protective element surrounds the backing element, in particular when the protective unit is in an assembled state, as viewed along the central axis of the backing element and/or of the protective element, at least mainly, in particular at least substantially entirely. Preferably, the protective element, in particular when the protective unit is in an assembled state and/or is arranged on the backing element, extends at least mainly, in particular at least substantially entirely, along an, in particular upper, outer edge of the backing element, the protective element in particular bearing against the outer edge of the backing element. It is conceivable for the protective unit to comprise more than one protective element, each bearing against the outer edge of the backing element and, in particular, realized at a distance from each other. It is also conceivable, however, for the protective elements to be arranged against each other and/or connected to each other for the purpose of arrangement on and/or fastening to the backing element.
It is additionally proposed that the backing element realize at least one holding means that is designed to hold the protective unit, in particular a protective element, in particular the aforementioned, of the protective unit, on the backing element in a force-fitting and/or form-fitting manner. An advantageously stable connection between the backing element and the protective element becomes possible. It is advantageously possible to dispense with additional fastening elements for holding the protective element on the backing element. Thus, an advantageously low number of components of the abrasion tool device, and thus also advantageously low production costs, can be achieved. Particularly preferably, the backing element and the at least one holding means are in each case realized as a single part. In particular, the holding means is realized as an extension, in particular a pin, a protrusion or the like, or as a recess. In particular, the protective element is realized so as to correspond to the backing element and the holding means, and is designed to be connected to the backing element in a force-fitting and/or form-fitting manner, in particular via the holding means. Preferably, the protective element realizes at least one counter-holding means that is designed to act in combination with the holding means for the purpose of connecting the protective element and the backing element in a force-fitting and/or form-fitting manner, in particular when the protective element is arranged on the backing element. Particularly preferably, the protective element and the at least one counter-holding means are realized as a single part. For example, the counter-holding means, in particular corresponding to the holding means, is realized as an extension, in particular a pin, a protrusion or the like, or as a recess. Preferably, the holding means is arranged, in particular as viewed from the central axis of the backing element, in an outer peripheral region of the backing element, which in particular adjoins the outer edge of the backing element. In particular, the counter-holding means, in particular as viewed from the central axis of the protective element, is arranged in an outer peripheral region of the protective element. In particular, the at least one holding means is arranged on a side of the backing element that faces away from the contact face. Preferably, the at least one counter-holding means is arranged on a side of the protective element arranged in the connection direction. It is conceivable for the backing element to comprise more than one holding means. In particular, it is conceivable for the protective element to comprise more than one counter-holding means. In particular, a number of holding means corresponds to a number of counter-holding means. In a preferred design, the holding means and/or the counter-holding means are evenly distributed around a central axis of the backing element and/or of the protective element.
It is furthermore proposed that the fastening unit comprise at least one intermediate element that is designed to be arranged between the backing element and the abrasive so as to be in particular at least substantially non-destructively removable and/or replaceable at least substantially without use of any tools, wherein the intermediate element is made from a material having a melting temperature of more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., very preferably more than 240° C., and particularly advantageously preferably more than 250° C. An advantageously high degree of flexibility of the abrasion tool device becomes possible, in particular in respect of application possibilities and combinations with different designs of abrasive, with preferably, at the same time, an advantageously unaltered high degree of resistance in respect of temperature-related damage. It becomes possible to achieve an advantageously application-specific and/or situation-specific adjustment of external dimensions of the abrasion tool device, of a density of the abrasion tool device, of a shape of the abrasion tool device, in particular in respect of supporting of differently shaped abrasives, of removal of heat to the backing element or the like. For abrasion in corners, for example, the intermediate element can be used to convert a rounded shape of the backing element, advantageously simply and rapidly, in particular without disassembling the entire abrasion tool device, into an at least partially angular support surface for receiving the abrasive. “Substantially non-destructive” is to be understood to mean, in particular, that a component, in particular the intermediate element, is not irreversibly changed, in particular damaged, plastically deformed or destroyed, during an activity, in particular during a removal and/or replacement of the intermediate element. In particular, an at least substantially non-destructive elastic bending of the component is conceivable. An activity that can be performed “substantially without use of any tools”, in particular a removal and/or replacement of the intermediate element, is to be understood to mean, in particular, as an activity that can be performed without the aid of tools, such as parting-off tools such as, for example, a saw, a wedge or the like, and/or chemical parting-off agents such as, for example, solvents or the like. Preferably, the intermediate element can be fastened to the backing element and/or the abrasive via at least one fastening element and/or a bonding agent of the fastening unit. It is conceivable for the/a heat transfer coating to be arranged on the intermediate element, in particular on an underside of the intermediate element that faces toward the abrasive. For example, the intermediate element can be fastened to the backing element and/or the abrasive via a hook-and-loop fastening of the fastening unit. In particular, a fastening means of the hook-and-loop fastening is connected to the intermediate element in a materially bonded manner. For example, the intermediate element is made from at least one plastic, in particular polyurethane, or of at least one metal. Particularly preferably, the intermediate element is made from materials/a material other than a foam. In particular in a design in which the intermediate element is made from a metal, a maximum thickness of the intermediate element is preferably less than 3 mm, preferably less than 2 mm and preferably less than 1.5 mm. In addition, for optimized heat distribution away from the abrasive, it is conceivable for the intermediate element to comprise cut-outs or protuberances that are arranged in particular at least partially on an underside of the intermediate element that faces toward the abrasive. Preferably, the intermediate element and the backing element are of a modular design, it being conceivable for the abrasion tool device to be operated with and without an intermediate element. Preferably, the intermediate element is at least substantially plate-like. A “substantially plate-like” component, in particular the intermediate element, is to be understood to mean, in particular, a three-dimensional element that, as viewed in a development in a plane, has a non-circular cross-sectional area in a cross-section perpendicular to the plane and, perpendicularly to the plane, has a material thickness that in particular is at least substantially constant and that is less than 50%, preferably less than 25%, and particularly preferably less than 10% of an areal extent of the three-dimensional element parallel to the plane, in particular of a smallest areal extent of the element parallel to the plane. In particular, the intermediate element is realized as an intermediate pad or an intermediate plate. Preferably, the intermediate element is designed to define a shape of the abrasive supported by the backing element, in particular the contact face of the backing element. In particular, the intermediate element has a seating face designed for arrangement of the intermediate element on the backing element. In particular, the seating face of the intermediate element is arranged on a side of the intermediate element that faces toward the backing element, in particular when the abrasion tool device is in an assembled state. Preferably, the seating face of the intermediate element, in particular as viewed along the central axis of the backing element, is at least substantially identical in shape to the contact face of the backing element. Preferably, the intermediate element comprises a contact face designed for arrangement of the abrasive on the intermediate element. Preferably, the seating face of the intermediate element, in particular as viewed along a central axis of the intermediate element, is at least substantially identical in shape to the abrasive, in particular to a base surface of the abrasive in a plane of main extent of the abrasive. It is conceivable for the contact face and the seating face of the intermediate element to be at least substantially identical, or to differ, in design. Preferably, it is conceivable for the contact face and the seating face of the intermediate element to differ from each other in their basic geometric shape. For example, one shape of the seating face of the intermediate element is rounded or round, in particular in the shape of circular surface, while a shape of the contact face of the intermediate element has at least one corner, in particular for processing at a corner of a workpiece or an area surrounding the workpiece. Alternatively or additionally, it is conceivable for the intermediate element to be designed for adapting a stiffness for supporting the abrasive element, in particular without removing and/or replacing the backing element. It is conceivable for the intermediate element to have a stiffness that differs from a stiffness of the backing element and/or a modulus of elasticity that differs from a modulus of elasticity of the backing element, for example to protect a workpiece to be processed that has a particularly soft or particularly hard surface for processing. In particular, abrasion power tools each have at least one limit value for a maximum moment of inertia of the abrasion tool device, in particular at least of the backing unit, the fastening unit and the abrasive, in respect of a rotation about the axis of motion and/or the central axis of the backing element. Preferably, a ratio of a moment of inertia of the backing element, with respect to a rotation about the axis of motion, and of the limit value for a maximum moment of inertia of the abrasion tool device is at most 0.75, preferably at most 0.6, and more preferably at most 0.5. In particular, a ratio of the moment of inertia of the backing element and of the limit value for a maximum moment of inertia of the abrasion tool device is at least 0.1, preferably at least 0.2, and more preferably at least 0.3. Preferably, a proportion of the maximum moment of inertia of the abrasion tool device, which corresponds to a difference of the limit value for a maximum moment of inertia of the abrasion tool device and the moment of inertia of the backing element in respect of a rotation about the axis of motion, is available for a moment of inertia of the fastening unit, in particular of the intermediate element, and of the abrasive with respect to a rotation about the axis of motion. Preferably, a ratio of a common moment of inertia of the fastening unit, in particular the intermediate element, and the abrasive with respect to a rotation about the axis of motion and of the limit value for a maximum moment of inertia of the abrasion tool device corresponds to a value from a range of values of from 0.25 to 0.9, preferably from 0.4 to 0.8, and more preferably from 0.5 to 0.7. Preferably, a quotient of the moment of inertia of the backing element in respect of a rotation about the axis of motion and a weight of the backing element corresponds to a value from a range of values of from 250 mm2 to 1800 mm2, preferably from 250 mm2 to 2000 mm2, and more preferably from 250 mm2 to 2500 mm2. Preferably, a ratio of the moment of inertia of the backing element in respect of a rotation about the axis of motion and a maximum surface area of the contact face of the backing element corresponds to a value from a range of values of from 0.001 kg to 0.01 kg, preferably from 0.003 kg to 0.008 kg, and more preferably from 0.004 kg to 0.006 kg.
It is additionally proposed that the backing element be realized as a strut structure. Preferably, the strut structure is realized in the manner of a skeleton. Preferably, the strut structure is composed of a multiplicity of identical elementary cells or elementary meshes, which in particular are each composed of a plurality of struts. An “elementary cell” is to be understood to mean, in particular, a three-dimensional basic body, wherein a uniform grid or a uniform structure, in particular the strut structure, can be formed by a juxtaposition of a multiplicity of basic bodies in at least one direction in space. An “elementary mesh” is to be understood to mean, in particular, a two-dimensional basic body, in particular a two-dimensional arrangement, wherein a uniform grid or a uniform structure, in particular the strut structure, can be formed by a juxtaposition of a multiplicity of basic bodies in at least one direction along a plane. Preferably, the backing element is composed of more than one layer of elementary cells or elementary meshes of the strut structure. It is conceivable for the strut structure to be composed of a multiplicity of at least more than one elementary cell or elementary mesh of the strut structure in each case. It is conceivable for the elementary cells or elementary meshes of the strut structure, as viewed in a plane of main extent of the backing unit, to have an n-cornered basic shape such as, for example, a rectangular or honeycomb basic shape. For example, the strut structure is realized as a cubic grid, with struts arranged along the grid lines. It is also conceivable for the strut structure to have a honeycomb structure at least along an axis of the backing element that in particular is aligned perpendicularly to the contact face, wherein in particular the elementary cells of the strut structure each have the shape of an equilateral hexagon in at least one sectional plane. In particular in a design of the backing element in which the backing element is composed of more than one layer of elementary meshes of the strut structure, it is conceivable for layers of elementary meshes to be arranged offset from one another, in particular along an axis of the backing element that is aligned perpendicularly to the contact face. Alternatively or additionally, it is conceivable for the layers of the elementary meshes to extend parallel to the contact face of the backing element and, in particular, to be arranged along an axis of the backing element that is aligned perpendicularly to the contact face, alternately from layer to layer in an offset manner along at least one axis aligned parallel to the contact face. In particular, it is conceivable for the strut structure to have a graphite structure. An advantageously high degree of robustness and stability of the abrasion tool device becomes possible, in particular with a simultaneously advantageously low mass and advantageously high thermal conduction of the backing element.
It is also proposed that the backing unit comprise at least one support element, wherein the support element at least mainly encloses the backing element, and wherein the support element has a thermal conduction characteristic that is greater than a thermal conduction characteristic of the backing element. Preferably, the support element is designed to dissipate heat generated at the abrasive. In particular, the support element is designed to protect the backing element against impacts and/or plastic deformations, in particular of the individual struts, in a design of the abrasion tool device in which the backing element is realized as a strut structure. In particular in a design of the abrasion tool device in which the backing element is realized as a strut structure, the backing element is preferably arranged, in particular as an endoskeleton, at least mainly, within the support element. Preferably, the support element is at least mainly, preferably at least substantially entirely, made from the material having a melting temperature of more than 160° C., in particular more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., very particularly preferably more than 240° C., and particularly advantageously preferably more than 250° C. Preferably, the support element is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that in particular is less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and very particularly preferably less than 260° C. Preferably, the support element is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that is less than 350° C. and greater than 160° C., in particular less than 300° C. and greater than 180° C., preferably less than 280° C. and greater than 200° C., particularly preferably less than 280° C. and greater than 220° C., and very particularly preferably less than 280° C. and greater than 240° C. In particular, the support element is at least mainly made from a foam or other plastic. Preferably, the backing element has a greater stiffness than the support element. An advantageously high degree of robustness and stability of the abrasion tool device becomes possible.
Also proposed is an abrasive, comprising at least one working face that has a multiplicity of abrasive elements, and comprising at least one interface or connection face for arrangement on or connection to the fastening unit of an abrasion tool device according to the invention, wherein the interface or connection face has at least one, preferably the aforementioned, fastening element, in particular realized as a hook-and-loop fastening, which is made in particular at least mainly, preferably at least substantially entirely, from a material having a melting temperature of more than 160° C., in particular more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., very particularly preferably more than 240° C., and particularly advantageously preferably more than 250° C. Preferably, the fastening element of the abrasive is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that in particular is less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and very particularly preferably less than 260° C. Preferably, the fastening element of the abrasive is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that is less than 350° C. and greater than 160° C., in particular less than 300° C. and greater than 180° C., preferably less than 280° C. and greater than 200° C., particularly preferably less than 280° C. and greater than 220° C., and very particularly preferably less than 280° C. and greater than 240° C. Preferably, the abrasive is realized as a replaceable abrasive. In particular in a design of the abrasive in which the fastening element of the abrasive is realized as a part of a hook-and-loop fastening, the fastening element of the abrasive is preferably, in particular at least mainly, made from a fiber-reinforced thermoplastic. Preferably, the interface or the connection face, in particular the fastening element of the abrasive, bears at least substantially with full surface contact against the working face, in particular on a side of the working face that faces away from the abrasive elements. Preferably, the interface or the connection face, in particular the fastening element of the abrasive, extends at least mainly over an entire side of the working face. Preferably, the working face and/or the interface or connection face has a basic shape, as viewed in a plane of main extent of the abrasive, at least one outer contour of the basic shape of the working face and/or of the interface or connection face corresponding to an outer contour of the basic shape of the backing element. Alternatively or additionally, it is conceivable for the interface or the connection face, in particular the fastening element, to be arranged in an evenly distributed manner over an entire side of the working face. An advantageously high degree of robustness and stability becomes possible, in particular with regard to temperature-related loads acting upon the fastening element of the abrasive. The abrasive can be used for an advantageously long period of time. An advantageously secure connection of the abrasive to the abrasion tool device becomes possible.
It is furthermore proposed that the abrasive have at least one heat transfer coating arranged between the working face and the fastening element. In particular, the heat transfer coating is at least substantially similar to the heat transfer coating, described above, of the abrasion tool device. Preferably, the heat transfer coating of the abrasive is designed to remove heat generated at the working face during an abrasion process. Preferably, the heat transfer coating of the abrasive bears at least substantially with full surface contact against the working face and/or the fastening element of the abrasive. Preferably, the heat transfer coating of the abrasive has a higher thermal conduction characteristic than the working face and/or the fastening element of the abrasive. An advantageously high degree of robustness and stability of the abrasive becomes possible, in particular because heat generated at the abrasive can advantageously be dissipated rapidly via the heat transfer coating. An advantageously high level of thermal conduction, thermal convection and/or thermal diffusion can be achieved in abrasion applications.
Also proposed is an abrasion tool system, comprising at least one abrasion tool device according to the invention, and comprising at least one abrasive according to the invention. Preferably, the abrasive is connected to the abrasion tool device, in particular replaceably, in at least one state of assembly of the abrasion tool system. An advantageously high degree of robustness and stability of the abrasion tool system becomes possible, in particular with regard to temperature-related loads during an abrasion process. An advantageously high processing accuracy can be achieved, in particular because it is possible to achieve an advantageously high resistance of the backing element, for example temperature-related deformations and/or damage. It is thus possible to ensure an advantageously permanently homogeneous processing surface. It is advantageously possible to prevent wear phenomena, for example partial melting, of the backing element, which can occur due to the generation of a large amount of heat, in particular in the case of relatively high contact pressure and/or relatively long periods of use. It is thus possible, advantageously, to ensure that the abrasive is securely connected to the backing element.
The abrasion tool device according to the invention, the abrasive according to the invention and/or the abrasion tool system according to the invention are/is not intended in this case to be limited to the application and embodiment described above. In particular, the abrasion tool device according to the invention, the abrasive according to the invention and/or the abrasion tool system according to the invention may have a number of individual elements, components and units that differs from a number stated herein, in order to fulfill an operating principle described herein. Moreover, in the case of the value ranges specified in this disclosure, values lying within the stated limits are also to be deemed as disclosed and applicable in any manner.
Further advantages are given by the following description of the drawings. Four exemplary embodiments of the invention are represented in the drawings. The drawings, the description and the claims contain numerous features in combination. Persons skilled in the art will also expediently consider the features individually and combine them to create appropriate further combinations.
In the drawings:
The abrasion tool device 12a has a protective unit 80a, which is arranged on the backing element 22a and is designed to protect a workpiece or an external unit, in particular from damage, and/or to damp an impact, in particular a direct impact, of the backing element 22a on the workpiece or on the external unit, in particular during an abrasion operation, the workpiece and the external unit in particular not being shown in
The protective unit 80a comprises a protective element 84a arranged on an outer side 88a of the backing element 22a. The protective element 84a is arranged on an outer edge 82a of the backing element and on two outer faces 90a, 92a of the backing element 22a that face away from the abrasive 20a and the contact face 34a. The protective element 84a is arranged at a distance from the contact face 34a and the abrasive 20a. Preferably, one outer face 90a of the two outer faces 90a, 92a is aligned transversely, in particular perpendicularly, to the contact face 34a and at least partially delimits the contact face 34a. Preferably, a further outer face 92a of the two outer faces 90a, 92a is aligned parallel to the contact face 34a. The outer face 90a extends at least substantially entirely around the axis of motion 26a. In particular, the outer edge 82a is arranged within the plane of main extent of the backing element 22a and extends at least substantially entirely around the axis of motion 26a. Preferably, the outer edge 82a and the outer face 92a that is aligned parallel to the contact face 34a are arranged at a distance from the contact face 34a. The protective element 84a is arranged, along the outer edge 82a of the backing element 22a, at least substantially entirely around the axis of motion 26a. The protective element 84a, in particular as viewed perpendicularly to the plane of main extent of the backing element 22a, at least partially encloses the backing element 22a in a region of the outer edge 82a. In particular, the protective element 84a encompasses the outer edge 82a of the backing element 22a. The protective element 84a, as viewed perpendicularly to the plane of main extent of the backing element 22a, is arranged on the backing element 22a at least mainly, in particular entirely, on a side of a plane of the backing unit 16a that extends along the contact face 34a. The protective element 84a extends at least mainly, in particular at least substantially entirely, over a maximum thickness 50a of the backing element 22a at the outer edge 82a. The protective element 84a, in particular as viewed perpendicularly to the plane of main extent of the backing element 22a, has a maximum thickness 86a of in particular at least 0.3 mm, preferably at least 0.5 mm, preferably at least 0.8 mm, and particularly preferably at least 1 mm. The protective element 84a bears, along the outer edge 82a of the backing element 22a, against the outer face 90a and the further outer face 92a of the backing element 22a. The protective element 84a is connected as a single piece to the backing element 22a, in particular by means of an adhesive bonded joint. It is also conceivable, however, for the protective element 84a to be fastened to the backing element 22a by means of a form-fitting and/or force-fitting connection, in particular the backing element 22a having, in a region of the outer edge 82a, the outer face 90a and/or the further outer face 92a, at least one or more form-fitting and/or force-fitting extensions designed to fasten the protective element 84a. The protective unit 80a, in particular the protective element 84a, is made from a material having a melting temperature of more than 160° C., in particular more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., and very particularly preferably more than 240° C. The protective unit 80s, in particular the protective element 84a, is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that in particular is less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and very particularly preferably less than 260° C. The protective unit 80a, in particular the protective element 84a, is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that is less than 350° C. and greater than 160° C., in particular less than 300° C. and greater than 180° C., preferably less than 280° C. and greater than 200° C., particularly preferably less than 280° C. and greater than 220° C., and very particularly preferably less than 280° C. and greater than 240° C. The protective unit 80a, in particular the protective element 84a, is made from a plastic, in particular a thermoplastic. It is also conceivable, however, for the protective unit 80a, in particular the protective element 84a, to be made from a polyamide and/or from a rubber. Preferably, the protective element 84a is made from a material that has a lesser stiffness than the backing element 22a, in particular the material from which the backing element 22a is made. The protective unit 80a, in particular the protective element 84a, is realized so as to be replaceable, in particular the protective unit 80a, in particular the protective element 84a, being separable from the backing element 22a without leaving any residue and/or non-destructively. However, other designs of the protective unit 80a are also conceivable, for example comprising more than one protective element 84a, arranged along the outer edge 82a, the outer face 90a and/or the further outer face 92a. In particular in a design in which the protective unit 80a has more than one protective element 84a, it is conceivable for the protective elements 84a to only partially cover the outer edge 82a, the outer face 90a and/or the further outer face 92a of the backing element 22a, for example in a region of corners of a basic shape of the backing element 22a. Alternatively, it is conceivable for the protective element 84a to be arranged, in particular exclusively, on the backing element 22a via the further outer face 92a, in particular the protective element 84a, as viewed perpendicularly to the plane of main extent of the backing element 22a, extending out from the axis of motion 26a, beyond the outer edge 82a of the backing element 22a. Alternatively, it is conceivable for the protective element 84a to be arranged, in particular exclusively, on the backing element 22a, on the outer face 90a of the backing element 22a. The protective element 84a, in particular as viewed perpendicularly to the plane of main extent of the backing element 22a, has an outer edge or face that has a greater minimum distance than have/has the outer edge 82a and/or the outer face 90a of the backing element 22a from the axis of motion.
The fastening unit 18a has an adhesive element 30a realized as a bonding agent, which is designed to replaceably fasten the fastening element 28a of the fastening unit 18a, realized as a hook-and-loop fastening, to the backing element 22a. The adhesive element 30a is designed to connect the fastening element 28a of the fastening unit 18a to the backing element 22a in a materially bonded manner. In
The backing element 22a delimits six recesses 36a designed to dissipate heat from the abrasive 20a and/or the backing element 22a to an environment surrounding the backing unit 16a. The backing element 22a is realized in such a manner that the recesses 36a extend from a side on which the contact face 34a is arranged, preferably over a maximum thickness of the backing element 22a, to a side of the backing element 22a that faces toward the connection region 14a. The backing element 22a is realized in such a manner that the recesses 36a are arranged, with an even distribution over the contact face 34a of the backing element 22a, around the axis of motion 26a, in particular the connection region 14a. The faces 38a of the backing element 22a that delimit the recesses 36a, as viewed in the plane of main extent of the backing element 22a, are of an identical basic shape. Preferably, the faces delimiting the recesses 36a are arranged perpendicularly to the contact face 34a. The recesses 36a delimited by the backing element 22a are designed at least to increase a diffusion of heat generated during an abrasion process, in particular in a processing region 40a of the abrasive 20a, from the contact face 34a to a side of the backing unit 16a, in particular of the backing element 22a, that faces away from the fastening unit 18a, preferably as compared with a design of the backing element 22a in which the backing element 22a is realized without recesses. The connection region 14a delimits, via an outer side 33a, six recesses 35a which, when the connection region 14a is fastened to the backing unit 16a, in particular as viewed perpendicularly to the plane of main extent of the backing element 22a, are arranged congruently with the recesses 36a of the backing element 22a. Preferably, the outer side 33a of the connection region 14a, in regions of the recesses 35a, 36a delimiting by the backing element 22a and the connection region 14a, is at least partially parallel, in particular flush, with the faces 32a of the backing element 22a that delimit the recesses 36a delimited by the backing element 22a. In particular, the backing element 22a delimits at least one further recess 37a, which extends around the axis of motion 26a. The further recess 37a, as viewed in a plane of main extent of the backing element 22a, is arranged in a region of the backing element 22a in which the connection region 14a is arranged on the backing element 22a. However, other designs of the backing unit 16a, in particular of the backing element 22a, are also conceivable.
The abrasion tool device 12a has a heat transfer coating 42a, which is arranged between the backing unit 16a, in particular the backing element 22a, and the fastening unit 18a, preferably on the contact face 34a. It is also conceivable, however, for the heat transfer coating 42a to be arranged on the fastening unit 18a on a side of the fastening unit 18a, in particular of the fastening element 28a of the fastening unit 18a, that faces away from the backing unit 16a, in particular the backing element 22a. The heat transfer coating 42a bears at least substantially with full surface contact against the fastening element 28a of the fastening unit 18a. The heat transfer coating 42a has a greater thermal conduction characteristic than the backing unit 16a, in particular the backing element 22a, and/or the fastening unit 18a, in particular the fastening element 28a of the fastening unit 18a. The heat transfer coating 42a is made of copper. However, other designs of the heat transfer coating 42a are also conceivable, the heat transfer coating 42a being made, for example, from a noble metal and/or an alkaline earth metal, a carbon compound, in particular graphene, diamond, and/or a graphite close to graphene or the like. The heat transfer coating 42a is in particular vapor-deposited onto the fastening element 28a of the fastening unit 18a.
The fastening element 28a of the fastening unit 18a bears at least substantially with full surface contact against the backing element 22a, in particular the contact face 34a, via the adhesive element 30a. The fastening unit 18a, in particular the fastening element 28a of the fastening unit 18a, delimits six cut-outs 44a that are designed to dissipate heat from the abrasive 20a and/or the backing unit 16a to an environment surrounding the fastening unit 18a, in particular the fastening element 28a of the fastening unit 18a. The fastening unit 18a, in particular the fastening element 28a of the fastening unit 18a, is realized in such a manner that the cut-outs 44a extend from a side on which the fastening element 28a of the fastening unit 18a is arranged on the contact face 34a, over a maximum thickness 46a of the fastening unit 18a, in particular of the fastening element 28a of the fastening unit 18a, to a side of the fastening unit 18a, in particular of the fastening element 28a of the fastening unit 18a, that faces toward the abrasive 20a. The fastening element 28a is realized in such a manner that the cut-outs 44a are arranged uniformly around the axis of motion 26a, as viewed in the plane of main extent of the fastening element 28a of the fastening unit 18a. In particular, the fastening element 28a of the fastening unit 18a delimits, around the axis of motion 26a, a recess 48a arranged so as to correspond to the further recess 37a of the backing element 22a around the axis of motion 26a. However, other designs of the fastening unit 18a, in particular of the fastening element 28a of the fastening unit 18a, are also conceivable, for example as an adhesive bonded joint, in particular a re-releasable adhesive bonded joint, as a hook, as a clip, as a vacuum element or the like.
The abrasive 20a comprises a working face 54a, which has a multiplicity of abrasive elements, and a connection face 53a for connection to the fastening unit 18a of the abrasion tool device 12a. The connection face 53a comprises a fastening element 78a, realized as part of a hook-and-loop fastening, that is made from a material having a melting temperature of more than 160° C., in particular more than 180° C., preferably more than 200° C., particularly preferably more than 220° C., very preferably more than 240° C., and particularly advantageously preferably more than 250° C. Preferably, the fastening element 78a of the abrasive 20a is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that in particular is less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and very particularly preferably less than 260° C. Preferably, the fastening element 78a of the abrasive 20a is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that is less than 350° C. and greater than 160° C., in particular less than 300° C. and greater than 180° C., preferably less than 280° C. and greater than 200° C., particularly preferably less than 280° C. and greater than 220° C., and very particularly preferably less than 280° C. and greater than 240° C. The fastening element 78a of the abrasive 20a is realized so as to correspond to the fastening element 28a of the fastening unit 18a. The fastening element 78a of the abrasive 20a is made of a fiber-reinforced thermoplastic. The connection face 53a, in particular the fastening element 78a of the abrasive 20a, bears at least substantially with full surface contact against the working face 54a, on a side of the working face 54a that faces away from the abrasive elements. The connection face 53a, in particular the fastening element 78a of the abrasive 20a, extends over an entire side of the working face 54a. The working face 54a and the connection face 53a each have a basic shape, as viewed in a plane of main extent of the abrasive 20a, at least one outer contour of the basic shape of the working face 54a and of the connection face 53a corresponding to an outer contour of the basic shape of the backing element 22a. The working face 54a has a maximum thickness 56a of 2 mm parallel to the axis of motion 26a. The connection face 53a, in particular the fastening element 78a of the abrasive 20a, has a maximum thickness 58a of 2 mm parallel to the axis of motion 26a. The abrasive 20a comprises a heat transfer coating 60a, which is arranged between the working face 54a and the fastening element 78a of the abrasive 20a. Preferably, the heat transfer coating 60a of the abrasive 20a is designed to remove heat generated at the working face 54a during an abrasion process. The heat transfer coating 60a of the abrasion tool device 12a and the heat transfer coating 42a of the abrasive 20a are each realized as a flat, thin layer and have a maximum thickness 62a of 0.3 mm parallel to the axis of motion 26a. The heat transfer coating 60a of the abrasive 20a bears at least substantially with full surface contact against the working face 54a and against the fastening element 78a of the abrasive 20a. The heat transfer coating 60a of the abrasive 20a has in particular a higher thermal conduction characteristic than the working face 54a and the fastening element 78a of the abrasive 20a. However, other designs of the abrasive 20a, in particular of the fastening element 78a of the abrasive 20a, are also conceivable.
The protective element 84e is arranged on an outer side of the backing element 22e that faces away from the abrasive and/or a contact face 34e of the backing element 22e. The protective element 84e bears against the outer edge 102e of the backing element 22e. Preferably, the protective element 84e is arranged at a distance from the contact face 34e of the backing element 22e and/or from the abrasive. The backing element 22e has an outer face 114e that, on a side of the outer face 114e of the backing element 22e that faces away from the contact face 34e of the backing element 22e, is at least partially covered by the protective element 84e. The outer face 114e of the backing element 22e is aligned at least substantially perpendicularly to the plane of main extent 103e of the backing element 22e, and is arranged around the axis of motion 26e and/or the central axis 96e of the backing element 22e and/or of the protective element 84e. In particular, the outer face 114e of the backing element 22e realizes the outer edge 102e of the backing element 22e. The outer edge 102e of the backing element 22e is arranged within the plane of main extent 103e of the backing element 22e, and extends at least substantially entirely around the axis of motion 26e and/or the central axis 96e of the backing element 22e and/or of the protective element 84e. The outer face 114e of the backing element 22e delimits the contact face 34e of the backing element 22e via a side edge of the outer face 114e of the backing element 22e. The protective element 84e is arranged on the backing element 22e, along the outer edge 102e and/or the outer face 114e of the backing element 22e, at least substantially entirely around the axis of motion 26e and/or the central axis 96e. The protective element 84e encompasses the outer edge 102e of the backing element 22e at least substantially perpendicularly to the central axis 96e of the backing element 22e. The protective element 84e extends at least mainly over a maximum thickness 50e of the backing element 22e, in particular at the outer edge 102e of the backing element 22e. Preferably, the protective element 84e, in particular as viewed perpendicularly to the plane of main extent 103e of the backing element 22e, has a maximum thickness 86e of in particular at least 0.3 mm, preferably at least 0.5 mm, more preferably at least 0.8 mm, and particularly preferably at least 1 mm. Preferably, a minimum thickness 86e of the protective element 84e is at most 1 cm, preferably at most 0.5 mm and preferably at most 3 mm. Preferably, the maximum thickness 86e of the protective element 84e is less than the maximum thickness 50e of the backing element 22e. Preferably, the protective unit 80e, in particular the protective element 84e, is at least mainly, in particular at least substantially entirely, made from the material having a melting temperature that in particular is less than 350° C., preferably less than 300° C., particularly preferably less than 280° C., and very particularly preferably less than 260° C. The protective unit 80e, in particular the protective element 84e, is made from a glass-fiber-reinforced plastic. However, other designs of the protective unit 80e, in particular of the protective element 84e, are also conceivable, for example made from a thermoplastic or a polyamide, and/or from a rubber, from a partially aromatic polyamide, in particular of the type Grivory GV-5H, or from polyphenylene sulfide Preferably, the protective element 84e is made from a material that has a lesser stiffness than the backing element 22e, in particular the material from which the backing element 22e is made. It is conceivable for the protective unit 80e, in particular the protective element 84e, to be realized so as to be replaceable, in particular the protective unit 80e, in particular the protective element 84e, being separable from the backing element 22e without leaving any residue and/or non-destructively. Alternatively, it is conceivable for the protective unit 80e to comprise more than one protective element 84e, arranged on the backing element 22e, along the outer edge 102e and/or the outer face 114e of the backing element 22e. In particular in a design in which the protective unit 80e has more than one protective element 84e, it is conceivable for the protective elements 84e of the protective unit 80e to only partially cover the outer edge 102e and/or the outer face 114e of the backing element 22e, for example in a region of corners of a basic shape of the backing element 22e.
The protective element 84e has two outer faces 112e, 113e, which, in particular in at least one state in which the protective element 84e is arranged on the backing element 22e, as viewed in a sectional plane comprising the central axis 96e of the backing element 22e and/or of the protective element 84e, are at least substantially inclined relative to the central axis 96e of the backing element 22e and/or of the protective element 84e. The outer edge 98e of the protective element 84e delimits the outer faces 112e, 113e of the protective element 84e at least partially, in particular at least substantially entirely, as viewed around the central axis 96e of the backing element 22e and/or of the protective element 84e. Preferably, a plane of main extent of the protective element 84e, in at least one state in which the protective element 84e is arranged on the backing element 22e, is arranged at least substantially parallel to the plane of main extent 103e of the backing element 22e. The outer faces 112e, 113e of the protective element 84e have, at least substantially perpendicularly to the central axis 96e of the backing element 22e and/or of the protective element 84e, in each case a greater maximum distance 104e from the central axis 96e of the backing element 22e and/or of the protective element 84e than has the outer edge 102e of the backing element 22e. The protective element 84e has a connection direction 116e, the protective element 84e being designed to be arranged on, in particular fastened to, the backing element 22e by a movement in the connection direction 116e. The connection direction 116e is arranged at least substantially parallel to the central axis 96e of the backing element 22e and/or of the protective element 84e. The connection direction 116e is at least substantially perpendicular to the plane of main extent of the protective element 84e. The two outer faces 112e, 113e of the protective element 84e each have an angle 118e, 120e, relative to the central axis 96e of the backing element 22e and/or of the protective element 84e, from an angular range in particular of from 8° to 92°, preferably from 15° to 85°, and more preferably from 20° to 80°. One outer face 112e of the two outer faces 112e, 113e of the protective element 84e has an angle 118e, relative to the central axis 96e of the backing element 22e and/or of the protective element 84e, that is spanned in the connection direction 116e by a, in particular virtual, point of intersection 122e of a straight line, that extends at least substantially parallel to the central axis 96e and through the outer edge 98e of the protective element 84e, and by the outer face 112e of the protective element 84e. A further outer face 113e of the two outer faces 112e, 113e of the protective element 84e has an angle 120e, relative to the central axis 96e of the backing element 22e and/or of the protective element 84e, that is spanned contrary to the connection direction 116e by a, in particular virtual, point of intersection 124e of the straight line, that extends at least substantially parallel to the central axis 96e and through the outer edge 98e of the protective element 84e, and by the further outer face 113e of the protective element 84e. Preferably, the further outer face 113e of the protective element 84e realizes a chamfer on an outer edge of the protective element 84e that faces away from the contact face 34e. In particular, the outer face 112e of the protective element 84e realizes a chamfer on an outer edge of the protective element 84e that faces toward the contact face 34e. The further outer face 113e of the protective element 84e is arranged on a side of the protective element 84e that faces away from the backing element 22e, in particular the contact face 34e. The outer face 112e of the protective element 84e, as viewed at least substantially perpendicularly to the central axis 96e of the backing element 22e and/or of the protective element 84e, realizes a contour 126e of the protective element 84e, in particular delimiting the protective element 84e in the connection direction 116e. Preferably, the outer face 112e and the further outer face 113e of the protective element 84e are arranged at a distance from each other on the protective element 84e. It is also conceivable, however, for the outer face 112e and the further outer face 113e of the protective element 84e to at least partially delimit each other, in particular on one side in each case. Preferably, the two outer faces 112e, 113e, in particular the outer face 112e and the further outer face 113e, of the protective element 84e are realized with a flat surface. It is also conceivable, however, for the outer face 112e and/or the further outer face 113e of the protective element 84e to be curved.
The protective element 84e extends, at least substantially perpendicularly to the central axis 96e of the backing element 22e and/or of the protective element 84e, at least substantially entirely over a maximum extent 106e of the backing element 22e (see also
The protective element 84e realizes three counter-holding means 128e, which are designed to act in combination with the holding means 108e for the purpose of connecting the protective element 84e and the backing element 22e in a force-fitting and/or form-fitting manner, in particular when the protective element 84e is arranged on the backing element 22e. Particularly preferably, the protective element 84e and the counter-holding means 128e are realized as a single part. The counter-holding means 128e are each realized and arranged so as to correspond to one of the holding means 108e. The counter-holding means 128e are realized as extensions, which are intended in particular to engage in the holding means 108e when the protective element 84e is arranged on the backing element 22e. However, other designs of the backing element 22e, in particular of the holding means 108e, and/or of the protective element 84e, in particular of the counter-holding means 128e, are also conceivable. For example, it is conceivable for the counter-holding means 128e to be realized as recesses that are designed to act in combination with holding means 108e realized as pins or other types of extensions. The holding means 108e, in particular as viewed from the central axis 96e of the backing element 22e, are each arranged in an outer peripheral region of the backing element 22e, which in particular adjoins the outer edge 102e of the backing element 22e. The counter-holding means 128e, in particular as viewed from the central axis 96e of the protective element 84e, are each arranged in an outer peripheral region of the protective element 84e. The holding means 108e are arranged on a side of the backing element 22e that faces away from the contact face 34e, in particular the contact face 34e in
The intermediate element 110f has a seating face 136f designed for arrangement of the intermediate element 110f on the backing element 22f. In particular, the seating face 136f is arranged on a side of the intermediate element 110f that faces toward the backing element 22f, in particular when the abrasion tool device 12f is in an assembled state. Preferably, the seating face 136f, in particular as viewed along the central axis 96f of the backing element 22f, is at least substantially identical in shape to the contact face 34f of the backing element 22f. The intermediate element 110f comprises a contact face 138f designed for arrangement of the abrasive 20f on the intermediate element 110f. Preferably, the seating face 136f of the intermediate element 110f, in particular as viewed along a central axis of the intermediate element 110f that, in particular when the intermediate element 110f is arranged on the backing element 22f, comprises the central axis 96f of the backing element 22f, is at least substantially identical in shape to the abrasive 20f, in particular to a base surface of the abrasive 20f in a plane of main extent of the abrasive 20f It is conceivable for the contact face 138f and the seating face 136f of the intermediate element 110f to be at least substantially identical, or to differ, in design.
Preferably, it is conceivable for the contact face 138f and the seating face 136f of the intermediate element 110f to differ from each other in their basic geometric shape.
The abrasion tool device 12f, in particular the intermediate element 110f and the backing element 22f, is/are of a modular design, it being conceivable in particular for the abrasion tool device 12f and/or the abrasion tool system 10f to be operated with and without an intermediate element 110f. The intermediate element 110f is designed to adapt a contact face 34f of the backing element 22f to a shape of the abrasive 20f that may differ from a shape of the contact face 34f, in order to support the abrasive 20f. Preferably, the intermediate element 110f can be used to process a workpiece with differently shaped abrasives 20f, in particular without removing the backing element 22f. For example, without changing and/or removing the backing element 22f, a round abrasive 20f can be used for working a flat face of a workpiece by means of a round intermediate element 110f and/or, for working in a corner, an intermediate element 110f realized with at least one corner can be used with an angular abrasive 20f supported by the intermediate element 110f. The intermediate element 110f is designed to adapt a counterforce of the abrasion tool device 12f that counteracts a force transmitted from the workpiece, via the abrasive 20f, to the abrasion tool device 12f as work is being performed on a workpiece, in particular for the purpose of protecting the workpiece, the abrasive 20f and/or the abrasion tool device 12f, and/or for the purpose of protecting a user. For example, in the case of working on a softer surface such as, for example, wood, a lower counterforce is advantageous than, for example, in the case of working on metal, with the intermediate element 110f, which in particular has a lesser stiffness than the backing element 22f, being arranged between the backing element 22f and the abrasive 20f in the case of working on wood. In particular, it is conceivable for the abrasion tool device 12f, in the case of working on metal, to be used without the intermediate element 110f or with a further intermediate element, in particular made of a stiffer material than the intermediate element 110f.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2019 213 375.4 | Sep 2019 | DE | national |
| 10 2020 207 733.9 | Jun 2020 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2020/074557 | 9/3/2020 | WO |
