Patent Application
20250018519
There already exist known tool receiving devices for portable machine tools, in particular angle grinders, wherein the known tool receiving devices comprise at least one output unit with at least one output spindle which can be rotated, at least one rapid clamping unit which is arranged on the output spindle and comprises at least one torque transmission element that is connected to the output spindle in a rotationally fixed manner, and at least one securing element, in particular a securing element which is movably mounted in an axial direction along an output axis of the output spindle, at least one locking unit for preventing the output spindle from rotating, and at least one actuating unit that has at least one actuating element, in particular a movably mounted actuating element, by means of which the locking unit can be actuated, in particular as a result of a movement of the actuating element.
The invention proceeds from a tool receiving devices for portable machine tool, in particular for an angle grinder, the tool receiving device comprising at least one output unit with at least one output spindle which can be rotated, at least one rapid clamping unit which is arranged on the output spindle and comprises at least one torque transmission element that is connected to the output spindle in a rotationally fixed manner, and at least one securing element, in particular a securing element which is movably mounted in an axial direction along an output axis of the output spindle, at least one locking unit for preventing the output spindle from rotating, and at least one actuating unit that has at least one actuating element, in particular a movably mounted actuating element, by means of which the locking unit can be actuated, in particular as a result of a movement of the actuating element.
It is proposed that the actuating element be provided to actuate the rapid clamping unit, in particular as a result of a movement of the actuating element, in particular the securing member or the torque transmission element. The actuating element is preferably designed as a mechanical actuating element, for example as an actuating bracket, as an actuating lever, as an actuating push button, as an actuating slider or the like. The actuating element is preferred to be movably, in particular pivotably, rotatably, or translationally movably, mounted on a housing of the portable machine tool. However, it is also contemplated that the actuating element may be designed as an electrical or electronic actuating element, for example as a button, a switch, a touch-sensitive actuating sensor, or the like that generates an electrical or electronic signal as the result of an actuation, it being possible to process the signal using a computing unit of the tool receiving device or the portable machine tool so as to actuate the locking unit. In one embodiment of the actuating element as an electrical or electronic actuating element, it is contemplated that an actuation of the actuating element can be detected and an electrical signal provided for actuation of one or more actuators which is/are provided for moving the securing element and/or a locking element of the locking unit can be generated as a function of sensing the actuation. The term “provided” is understood in particular to mean specifically configured, specifically programmed, specifically designed, and/or specifically equipped. In particular, the phrase “an object being provided for a specific function” is intended to mean that the object fulfills and/or performs this specific function in at least one application—and/or operating state. By means of the embodiment according to the invention, a high ease of operation can advantageously be achieved, in particular because two units, in particular the locking unit and the rapid clamping unit, can be actuated substantially simultaneously as a result of an actuation of the actuating element. An operator can be advantageously protected from injury, since advantageously rotation of the output spindle can be reliably prevented when an insertable tool is being changed. Simple installation and/or removal of an insertable tool can be facilitated in the tool receiving device. Advantageously, components, in particular further actuating elements, are not needed, advantageously saving design space or making better use of already existing design space.
Preferably, the output unit is provided for driving an insertable tool rotatingly about the output axis, for example a cutting disc or a grinding disc or the like, the tool being attached to the rapid clamping unit. However, it is also contemplated that the output unit is provided for driving the insertable tool, which is attached to the rapid clamping unit, oscillatingly about the output axis. Preferably, the output unit is operatively connected to a drive unit of the portable machine tool in a manner already known to a person skilled in the art, in particular via at least one drive sprocket of the drive unit. The rotating or oscillating movement of the output unit, in particular of the output spindle and the rapid clamping unit arranged thereon, can preferably be generated as a result of the output unit cooperating with the drive unit of the portable machine tool, which comprises at least one electric motor or a pneumatic motor. The rapid clamping unit is preferably connected to the output spindle in a rotationally fixed manner. The rotational or oscillating movement of the output spindle is preferably transmittable, via the rapid clamping unit, in particular by means of the torque transmission element, to the insertable tool arranged on the rapid clamping unit. The torque transmission element preferably comprises a plurality of torque transmission projections, in particular at least two, preferably at least three, and more preferably at least four. The torque transmission projections are preferably arranged evenly distributed along a circumferential direction of the rapid clamping unit, in particular n-symmetrically. However, it is also contemplated that the torque transmission projections are arranged non-uniformly along the circumferential direction. The circumferential direction preferably runs in a plane extending at least substantially perpendicular to the output axis. The term “substantially perpendicular” is understood in particular to mean an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, in particular as viewed in a projection plane, include an angle of 90°, and the angle has a maximum deviation of, in particular, less than 8°, advantageously less than 5°, and more advantageously less than 2°. The torque transmission projections are preferably arranged along the circumferential direction offset relative to one another, in particular in the case of two torque transmission projections by 180°, in particular in the case of three torque transmission projections by 120°, and in particular more preferably in the case of four torque transmission projections by 90°. Preferably, the rapid clamping unit is provided for receiving small insertable tools, for example insertable tools having a maximum diameter of 200 mm or less.
Preferably, the securing element is arranged on the output spindle in a captive manner. In particular, the securing element captively arranged on the output spindle, and/or any other component arranged on the output spindle in a captive manner, in particular in an open state and in a closed state of the rapid clamping unit, is captively connected to the output spindle. A “open state” of the rapid clamping unit is to be understood in particular as a state of the rapid clamping unit that allows removal of the insertable tool arranged on the rapid clamping unit and/or that allows the rapid clamping unit to receive installation of the insertable tool on the rapid clamping unit. A “closed state” of the rapid clamping unit is to be understood in particular as a state of the rapid clamping unit in which an insertable tool is fixed to the output unit and functionally ready and/or in which a, in particular non-destructive, removal of an insertable tool from the output unit is prevented. In particular, in the closed state of the rapid clamping unit, the securing element is provided for making a force—and/or positive-locking connection for the purposes of securing or fastening the insertable tool to the rapid clamping unit with the insertable tool.
Preferably, a positive locking, in particular axially, can be achieved by means of the securing element preferably by clamping at least a part of the insertable tool between at least two components of the rapid clamping unit. It is contemplated that the securing element, in particular in addition to the axial positive locking, generates a positive locking in the radial direction and/or the circumferential direction, wherein the circumferential direction lies in a plane whose surface normal is at least substantially parallel to the output axis. The securing element is in particular mounted translationally and/or rotationally about the output axis along a direction extending at least substantially parallel to the output axis, in particular in relation to the output unit. The term “substantially parallel” is in particular intended to mean an alignment of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation relative to the reference direction, of in particular less than 8°, advantageously less than 5° and more advantageously less than 2°. Preferably, an axis of movement of the fixing element is coaxial with the output axis.
Preferably, the rapid clamping unit comprises at least one spring element for applying a spring force to the securing element or the torque transmission element, in particular a spring force acting along the output axis, preferably in the direction of the torque transmission element or in the direction of the securing element. Preferably, the spring element is designed as a compression spring, in particular a spiral compression spring. However, another embodiment of the spring element that would appear sensible to a person skilled in the art could also be contemplated. It is preferable for one end of the spring element to be supported at the securing element or the torque transmission element. Preferably, an other end of the spring element is supported at a housing projection of the housing of the portable machine tool or at a bearing element, in particular a rolling bearing, for example a ball bearing or the like, of the output unit. The bearing element is preferably provided for rotatably mounting the output spindle in the housing. The spring element is preferably provided to implement an automatic resetting function of the rapid clamping unit in the closed state. However, alternatively or in addition to the spring element, it is also contemplated that the rapid clamping unit comprises at least one actuator for implementing an automatic resetting function.
The locking unit preferably comprises a locking element that is provided for a form-locked and/or force-locked connection to the output spindle or to a further locking element of the locking unit, in particular that is connected to the output spindle in a rotationally fixed manner, in at least one state, in particular in the open state, of the rapid clamping unit. The locking element is preferably movably mounted along a direction transverse, in particular at least substantially perpendicular, to the output axis, in particular translationally movably mounted. However, it is also contemplated that locking element is movably mounted along another direction that may appear meaningful to a person skilled in the art, for example, translationally movably mounted along a direction extending at least substantially parallel to the output axis. The locking element or the further locking element can be designed integrally with the securing element or integrally with the torque transmission element or can be designed as a separate component. The locking element or the further locking element is preferably movable as a result of an actuation of the actuating element, in particular directly by means of the actuating element or indirectly by means of the actuating element. The term “integral” should in particular understood to mean connected at least by substance-to-substance bonding, e.g., by a welding process, an adhesive bonding process, a process of molding on and/or another process that appears advantageous to a person skilled in the art, and/or advantageously formed in one piece, e.g., by production from a casting and/or by production in a single- or multi-component injection molding process and advantageously from a single blank. In a one-piece embodiment of the locking element with the securing element, the locking element is preferably designed as an axial projection of the securing element, which is arranged in particular on a side of the securing element facing away from the torque transmission element and is provided for engaging in the further locking element in the open state of the rapid clamping unit. In a one-piece embodiment of the locking element with the torque transmission element, the locking element is preferably embodied as an axial projection of the torque transmission element, which is arranged in particular on a side of the torque transmission element facing away from the securing element and is provided for engaging in the further locking element in the open state of the rapid clamping unit. Preferably, in a one-piece embodiment of the locking element with the securing element or with the torque transmission element arranged fixed to the housing inside the housing, in particular designed as a locking recess into which the locking element, designed as an axial projection, engages to block a rotational movement of the output spindle. However, it is also contemplated that the locking element is formed as a locking recess arranged on the securing element or on the torque transmission element, and the further locking element is designed as a locking projection that engages in the locking element as a result of a movement of the securing element or the torque transmission element relative to the further locking element. Other embodiments and/or arrangements of the locking unit that appear to be useful to a person skilled in the art are also contemplated. It is also contemplated that the tool receiving device according to the invention is designed independently of the locking unit in an alternative embodiment. In the alternative embodiment of the tool receiving device according to the invention, in particular in the alternative embodiment designed independently of the locking unit, the tool receiving device according to the invention preferably comprises at least one output unit which has at least one rotatingly driven output spindle, at least one rapid clamping unit arranged on the output spindle, the rapid clamping unit including at least one torque transmission element connected to the output spindle, in particular in a rotationally fixed manner, and at least one securing element, in particular a securing element axially movably mounted along an output axis of the output spindle, and at least one actuating unit which includes at least one actuating element, in particular movably mounted, the actuating element able to actuate the rapid clamping unit, in particular the securing element or the torque transmission element, in particular as a result of a movement of the actuating element, preferably in a manner described herein.
Furthermore, it is proposed that the tool receiving device comprises at least one gear unit provided for converting a movement of the actuating element for actuating the locking unit into a movement of the securing element or of the torque transmission element or for converting a movement of the actuating element for actuating the securing element or the torque transmission element into a movement of the locking unit, in particular of the locking element. The gear unit preferably comprises at least one gear element arranged on the actuating element, or at least cooperates with the actuating element, in particular sits against the actuating element. Preferably, the actuating element acts directly on the gear element or the gear element is arranged on the actuating element. Preferably, a movement of the actuating element is transferrable directly to the gear element. Preferably, the actuating element is fixedly connected to the gear element. By “fixedly” what is meant is a connection between at least two components, in particular the actuating element and the gear element, or between two units in which a movement of one of the components, or one of the units, is in particular directly transferrable to the other component or the other unit. In a pivotable mounting of the actuating element, the gear element is preferably connected to the actuating element in a rotationally fixed manner. In a translationally movable mounting of the actuating element, the gear element is preferably connected to the actuating element at least in a technically movable manner, in particular fixedly connected to the actuating element. The gear unit can involve any embodiments that appears to be useful to a person skilled in the art, such as an embodiment as a cam gear, as a cogged gear, as a rack gear, as a coupling gear or the like. The gear unit may be designed as a purely mechanical gear unit or as an actuator-assisted gear unit. By means of the embodiment according to the invention, converting an operating force into an actuating force can be achieved in a constructively simple manner. A high level of operating comfort can be advantageously achieved, in particular because two units, in particular the locking unit and the rapid clamping unit can be actuated substantially simultaneously as a result of an actuation of the actuating element and/or because a low operator force for actuating the actuating element can advantageously be converted into a large force for movement of the locking element and/or the securing element.
It is also proposed that the tool receiving device comprises at least one, in particular the aforementioned, gear unit, having at least one, in particular ramp-shaped, gear element, in particular the aforementioned gear element, which is provided for converting a translational or rotational movement of the actuating element into a translational movement of the securing element or the torque transmission element, in particular along a direction extending at least substantially parallel to the output axis of the output spindle. Preferably, the gear element is provided for displacing the securing element or the torque transmission element along the direction extending at least substantially parallel to the output axis of the output spindle counter to the spring force of the spring element, as a function of a movement of the actuating element. Preferably, the securing element or the torque transmission element comprises at least one ramp-shaped region, in particular a circumferential collar, which is designed to correspond to the ramp-shaped gear element. Preferably, a slope of the ramp-shaped gear element and/or of the ramp-shaped region of the securing element or of the torque transmission element is less than 50°, preferably less than 40°, and more preferably less than 30°. The ramp-shaped gear element can be formed from an oblique plane or can be designed as a helical line. The ramp-shaped gear element can be arranged on the actuating element or can be arranged on an additional component of the gear unit that cooperates with the actuating element. The ramp-shaped gear element can be rotatably or translationally movably mounted, in particular inside the housing of the portable machine tool. As an alternative to the gear element, it is contemplated that the actuating unit comprises an actuator that moves the securing element or the torque transmission element along the direction extending at least substantially parallel to the output axis as a function of an actuation of the actuating element. The actuator can be designed as a spindle drive, as a piston drive, for example as a hydraulic or as a pneumatic piston, as an electric motor or the like. By means of the embodiment according to the invention, a redirection of a direction of movement can be effectuated in a constructively simple manner. A high level of ease of use can advantageously be achieved together with low space requirements, in particular because as a result of the redirection of the direction of movement, a pre-existing design space can be advantageously used in a meaningful way. Converting an operating force into an actuating force can be achieved in a constructively simple manner. A high level of operator comfort can be advantageously achieved, in particular because a low operating force for actuating the actuating element can advantageously be converted into a high force for moving the locking element and/or the securing element. A preferred force distribution of an operating force necessary for the movement of the securing element and/or the locking element can advantageously be facilitated.
It is also proposed that the tool receiving device comprises at least one, in particular the aforementioned, gear unit, which includes at least one, in particular further or the aforementioned, gear element which cooperates with a projection arranged on the securing element or on the torque transmission element, in particular with the circumferential collar to effect a movement of the securing element or the torque transmission element as a function of an actuation of the actuating element. It is contemplated that the ramp-shaped gear element which is fixedly connected, in particular in a rotationally fixed manner, to the actuating element, cooperates with the projection arranged on the securing element or on the torque transmission element, in particular with the circumferential collar, to effect a movement of the securing element or the torque transmission element as a function of an actuation of the actuating element, wherein the circumferential collar is designed to correspond to the ramp-shaped gear element. Alternatively, it is contemplated that the gear unit comprises a further gear element which is translationally mounted in the housing of the portable machine tool and connected to the actuating element via the ramp-shaped gear element, wherein the further gear element cooperates with the projection arranged on the securing element or on the torque transmission element, in particular with the circumferential collar, to effect a movement of the securing element or of the torque transmission element as a function of an actuation of the actuating element. The further gear element is preferably designed as a rack. Preferably, the further gear element comprises a driving projection arranged transversely, in particular at least substantially perpendicularly, relative to a longitudinal axis of the further gear element, the driving projection being provided for cooperation with the projection arranged on the securing element, in particular the circumferential collar. The further gear element preferably includes a ramp projection provided for cooperating with the ramp-shaped gear element. The ramp projection preferably extends transversely, in particular at least substantially perpendicularly, relative to the longitudinal axis of the further gear element, in particular at an end of the further gear element which faces away from the drive projection of the further gear element. Preferably, the ramp projection comprises at least one ramp-shaped region, in particular a seating surface inclined toward the longitudinal axis of the further gear element. The ramp-shaped region of the ramp projection is preferably designed to correspond to the ramp-shaped gear element. In particular, the ramp-shaped region of the ramp projection has a slope corresponding to the ramp-shaped gear element. By means of the embodiment according to the invention, a reliable movement of the securing element can advantageously be realized as a function of the actuation of the actuating element. A movement coupling between the rapid clamping unit and the locking unit can be realized in a constructively simple manner. A high level of ease of use can advantageously be achieved together with low space requirements, in particular because as a result of the redirection of the direction of movement, a pre-existing design space can be advantageously used in a meaningful way. A particularly high level of operating comfort can advantageously be achieved.
Furthermore, it is proposed that the tool receiving device comprises at least one, in particular the aforementioned, gear unit which includes at least one, in particular the aforementioned further gear element or the aforementioned gear element for moving the securing element or the torque transmission element as a function of an actuation of the actuating element, wherein the in particular aforementioned further gear element, or the aforementioned gear element, is arranged, in at least one operational state, in a non-contacting state relative to the securing element or to the torque transmission element. Preferably, the gear element, in particular the aforementioned further gear element or the aforementioned gear element, is arranged, in a closed state of the rapid clamping unit, in a non-contacting state relative to the securing element or the torque transmission element. In particular, the in particular aforementioned further or aforementioned gear element, in a closed state of the rapid clamping unit, is arranged spaced apart, in particular, along a direction extending at least substantially parallel to the drive axis relative to the securing element, in particular relative to the projection of the securing element, or relative to the torque transmission element, in particular relative to the projection of the torque transmission element. Preferably, this can be realized by an offset arrangement of the securing element or of the torque transmission element and of the gear element, in particular the aforementioned further or the aforementioned gear element, along the direction at least substantially parallel to the drive axis, said arrangement existing at least in the closed state of the rapid clamping unit. In the closed state of the rapid clamping unit, the securing element is movable by means of the spring force of the spring element at most to a position of the securing element, that a distance between the in particular aforementioned further or the aforementioned gear element exists, in particular between the projection of the securing element and the ramp-shaped gear element or between the projection of the securing element and the projection of the further gear element. By means of the embodiment according to the invention, advantageously during an operation of the portable tool machine provided with the tool receiving device, wear on the securing element and/or the gear unit can be countered during a rotation of the rapid clamping unit. Advantageously, a long service life of the tool receiving device can be achieved.
It is further suggested that the securing element is movable along a direction of movement as a function of an actuation of the actuating element, the direction being transverse, in particular at least substantially perpendicular, to a direction of movement of the locking unit along which a locking element, in particular the aforementioned locking element, is movable as a function of an actuation of the actuating element. Preferably, the direction of movement of the securing element is at least substantially parallel to the output axis. Preferably, a direction of movement of the locking element, in particular in an embodiment of the locking element which is separate from the securing element, is transverse, in particular at least substantially perpendicular, to the output axis. However, it is also contemplated that the direction of movement of the securing element and/or the direction of movement of the locking element has/have a different orientation that may appear to be useful to a person skilled in the art. By means of the embodiment according to the invention, an already existing design space can be meaningfully used. A movement coupling between the rapid clamping unit and the locking unit can be realized in a constructively simple manner.
In addition, in particular in at least one embodiment, it is suggested that the tool receiving device comprises at least one gear unit, in particular the aforementioned gear unit, which comprises at least one gear element, in particular the aforementioned ramp-shaped gear element, which is arranged on a locking element, in particular the aforementioned locking element, of the locking unit, in particular designed in one piece with the locking element of the locking unit. The locking element preferably comprises at least one transverse projection provided for engagement in a locking recess of the further locking element, in particular connected to the output spindle in a rotationally fixed manner. The transverse projection extends, in particular in a mounted state, preferably starting from a base body of the locking element, along a direction extending at least substantially perpendicularly relative to the output axis, in the direction of the output spindle. Preferably, the transverse projection extends at least substantially parallel to a main extension plane of the base body of the locking element. The main extension plane of the base body of the locking element extends, in particular in a mounted state, at least substantially perpendicular to the output axis. The ramp-shaped gear element arranged on the locking element is preferably provided for cooperating with the ramp projection of the further gear element, in particular to move the securing element along the direction of movement of the securing element extending at least substantially parallel to the output axis. By means of the embodiment according to the invention, an already existing design space can be meaningfully used. Costs, assembly costs and components can be advantageously reduced. A movement coupling between the rapid clamping unit and the locking unit can be realized in a constructively simple manner.
Furthermore, it is proposed that the tool receiving device includes at least one detent unit which secures the actuating element, the rapid clamping unit, and/or the locking unit in at least one actuated position. The detent unit preferably comprises at least one detent element provided for securing the actuating element in an actuated position by means of a form-locked and/or force-locked connection. The detent element can act directly on the actuating element or can indirectly act on the actuating element by interposing one or more components, in particular components of the gear unit, in order to secure the actuating element in an actuated position by means of a form-locked and/or force-locked connection. It is also contemplated that the detent element is provided for securing the actuating element by means of an action of a magnetic force in an actuated position. Further embodiments of the detent unit for securing the actuating element in an actuated position that appear to be useful to a person skilled in the art are also contemplated. The detent unit is preferably provided for securing the rapid clamping unit in the open state, in particular as a result of a securing of the actuating element in an actuated position, and for securing the locking unit in a locked state in which a rotational movement of the output spindle is blocked by a form-lock mechanism. By means of the embodiment according to the invention, a high level of ease of use can advantageously be achieved. An operator can be advantageously protected from injury, since advantageously rotation of the output spindle can be reliably prevented when an insertable tool is being changed out.
It is further proposed that the tool receiving device comprises at least one detent unit which secures the actuating element, the rapid clamping unit and/or the locking unit in at least one actuated position and that the tool receiving device comprises at least one, in particular the aforementioned gear unit, wherein the detent unit is at least partially integral with the gear unit. In particular, it should be understood that a unit being designed integral with another unit means that the unit and the other unit comprise at least one commonly used component that is provided for the functioning of the unit and of the other unit. Preferably, the detent element of the detent unit is integrally designed with the ramp-shaped gear element. In particular, the detent element is designed as a flat surface or as a depression that connects directly to the ramp-shaped gear element, in particular to the inclined plane. Preferably, the securing element or the further gear element, in particular the ramp projection, sits against the detent element in a secured state of the actuating element. Preferably, as a result of the effect of the spring force of the spring element, the securing element or the further gear element, in particular the ramp projection, is pressed against the detent element in a secured state, whereby a movement of the securing element or the further gear element, and thereby of the actuating element, can in particular be prevented. The further gear element, in particular the ramp projection, preferably comprises a flattened region, in particular a flat surface, which is provided for cooperation with the detent element. Preferably, the flattened region is arranged between two ramp-shaped regions of the further gear element, in particular of the ramp projection. Preferably, the detent element is designed such that the secured position is releasable by a snap, in particular as a result of a movement of the detent element counter to a direction of a detent movement. By means of the embodiment according to the invention, a high level of ease of use can advantageously be achieved. An operator may be advantageously protected from injury, as it may be advantageously ensured that an unwanted snap back of the actuating element may be reliably prevented. An advantageously compact embodiment can be achieved. An already existing design space can be meaningfully used.
It is further proposed that the tool receiving device, in particular in an alternative configuration, comprises at least one guide unit provided for guiding a movement of the torque transmission element and limiting a maximum travel distance, in particular at least a maximum rotational distance, of the torque transmission element relative to the output spindle. Preferably, the guide unit is provided for guiding an axial movement of the torque transmission element relative to the output spindle. Alternatively or additionally, the guide unit is preferably provided for guiding a rotational movement of the torque transmission element relative to the output spindle, in particular for guiding a rotational movement of the torque transmission element about the output spindle. The torque transmission element is in particular rotatable along an angular range of less than 90°, preferably less than 60°, and more preferably more than 15° relative to the output spindle. Preferably, the torque transmission element is rotatable along the circumferential direction relative to the output spindle. The torque transmission element is preferably axially movable along a maximum axial distance of in particular less than 10 mm, preferably less than 5 mm, and more preferably less than 3 mm relative to the output spindle. The torque transmission element can perform a stepped movement relative to the output spindle by way of the guide unit, such as an axial movement followed by a rotational movement or vice versa, or the torque transmission element can perform a superimposed movement, such as an superposition of an axial movement and a rotational movement, relative to the output spindle, by means of the guide unit. The torque transmission element is movable using the guide unit, preferably relative to the securing element, in particular to allow the rapid clamping unit to be transitioned from an open state to a closed state or vice versa. By means of the embodiment according to the invention, a simple installation and/or removal of an insertable tool on the tool receiving device can be facilitated. A reliable movement, particularly of the torque transmission element, can be facilitated within predetermined limits. Advantageously, reliable and accurate positioning of the torque transmission element relative to the securing element can be realized, in particular to allow for ease of removal of an insertable tool from the rapid clamping unit or ease of insertion of the insertable tool on the rapid clamping unit.
In addition, it is suggested that the guide unit is configured as a slot guide, wherein at least one slot element of the guide unit is arranged on the output spindle, in particular fixed in place, and at least one further slot element of the guide unit is arranged on the torque transmission element, in particular fixed in place. Preferably, the slot element is designed as a bolt that is connected to the output spindle in a rotationally fixed manner. However, it is also contemplated that the slot element has a different embodiment, which appears to a person skilled in the art as a sensible embodiment, for example an embodiment as a projection, as a groove, as a land, as a threaded gear or the like. The slot element preferably extends transversely, in particular at least substantially perpendicular, to the output axis, in particular in an embodiment of the slot element as a bolt. Preferably, the slot element extends transversely through the output spindle, in particular at least into the securing element or past the securing element into the torque transmission element, in particular into the further slot element arranged on the torque transmission element. The slot element can protrude out past the output spindle on one side, two sides or multiple sides. Preferably, the securing element is connected to the output spindle by means of the slot element in a rotationally fixed manner. In particular, the securing element is arranged axially secured to the output spindle by way of the slot element along the output axis. The further slot element is preferably designed as a guide groove. Preferably, the slot element engages in the further slot element. Preferably, the guide unit comprises two further slot elements arranged in a mirror-symmetrical manner on the torque transmission element, each of which is designed as a guide groove. Preferably, the slot element engages into both further slot elements. However, it is also contemplated that the slot element is designed as a guide groove and is inserted into the output spindle, wherein the further slot element is designed as a bolt arranged on the torque transmission element in a rotationally fixed manner and extends through the slot element designed as a guide groove. The torque transmission element is preferably connected, by way of a cooperation of the slot element and the further slot element, to the output spindle in a rotationally fixed manner in the closed state of the rapid clamping unit. By means of the embodiment according to the invention, a motion trajectory, in particular of the torque transmission element relative to the output spindle, can be predetermined in a constructively simple manner. Reliable movement, in particular of the torque transmission element, within predetermined limits can be facilitated, in particular to realize a transition of the rapid clamping unit from the open state to the closed state, and vice versa. Advantageously, reliable and accurate positioning of the torque transmission element relative to the securing element can be realized, in particular to facilitate ease of removal of an insertable tool from the rapid clamping unit or ease of insertion of the insertable tool on the rapid clamping unit.
Furthermore, it is proposed that the guide unit comprises at least one slot element arranged on the output spindle, in particular fixed in place, in particular the aforementioned slot element which is connected to the torque transmission element for co-rotation of the torque transmission element. Preferably, the slot element is connected in shape-locked and/or force-locked fashion to the torque transmitting element to effect a co-rotation of the torque transmitting element. Preferably, the slot element engages in the further slot element arranged on the torque transmission element and sits against edge regions of the slot element designed as a guide groove to effect a co-rotation. Preferably, in at least a closed state of the rapid clamping unit, the slot element is provided for co-rotation of the torque transmission element, in particular for transferring torques from the output spindle to the torque transmission element. By means of the embodiment according to the invention, co-rotation of the torque transmission element, at least in a closed state of the rapid clamping unit, can be implemented in a constructively simple manner, wherein a movement of the torque transmission element is also achievable by the guide unit, which is provided for transitioning the rapid clamping unit to an open state, for example. A motion trajectory, in particular of the torque transmission element relative to the output spindle, can be provided in a constructively simple manner.
It is further preferably suggested, that the guide unit comprises at least one, in particular a further, slot element, in particular the aforementioned further slot element, which has at least two guide track portions that extend transversely relative to one another, in particular an axially extending guide track portion and a circumferential guide track portion. Preferably, the two guide track portions that extend transversely relative to each other are arranged immediately adjacent to each other. Preferably, the axially extending guide track portion has a main orientation that is at least substantially parallel to the output axis. The circumferential guide track portion is preferably arranged angled relative to the axial guide track portion, in particular when viewed in a projection plane. Preferably, the circumferential guide track portion extends along the circumferential direction with a slope, in particular similar to a portion of a thread profile of a thread. The circumferential guide track portion extends along the circumferential direction, in particular along an angular range of less than 90°, preferably less than 70°, and more preferably less than 50°. The guide unit is preferably designed such that the torque transmission element is rotatable along an angular range of, for example, 45° relative to the securing element. Other angular ranges that appear to be useful to a person skilled in the art are also contemplated that make sense to transition the rapid clamping unit from a closed state to an open state. Preferably, an overlap of an insertable tool as a result of a rotation of the torque transmission element relative to the securing element, in particular along a range of 45°, is released by the securing element. Preferably, the insertable tool is co-rotatable with the torque transmission element, in particular as a result of a seating of sections of a tool hub of the insertable tool on torque transmission projections of the torque transmission element in a state of the insertable tool arranged on the rapid clamping unit. By means of the embodiment according to the invention, an axial displacement of the torque transmission element and of the securing element can be implemented first in a constructively simple manner before a rotational movement to release an insertable tool takes place. Advantageously, a tool and/or component-protective movement of the torque transmission element can be facilitated, in particular with a low tendency to abrasion wear when the rapid clamping unit is actuated.
In addition, a portable machine tool, in particular an angle grinder, is suggested, having at least one tool receiving device according to the invention. The term “portable machine tool” is in this context understood to mean a machine tool for machining workpieces, the machine tool able to be transported and/or held by an operator without the need for a transport machine. In particular, the portable machine tool has a mass that is less than 40 kg, preferably less than 10 kg, and more preferably less than 5 kg. Preferably, the portable machine tool is designed as an angle grinder. However, it is also contemplated that the portable machine tool may have another embodiment, which appears to be useful to a person skilled in the art, such as an embodiment as a circular saw, as an oscillating machine tool, as a grinding machine or the like. By means of the embodiment according to the invention, a high level of ease of operation comfort can advantageously be achieved, in particular because two units, in particular the locking unit and the rapid clamping unit, can be actuated substantially simultaneously as a result of actuation of the actuating element. An operator can be advantageously be protected from injury, since advantageously rotation of the output spindle can be reliably prevented when an insertable tool is being changed out. Simple installation and/or removal of an insertable tool can be facilitated in the tool receiving device. Advantageously, components, in particular further actuating elements, are not needed, advantageously saving design space or making better use of already existing design space.
The tool receiving device according to the invention and/or the portable machine tool according to the invention should not be limited to the application and embodiment described above. In particular, the tool receiving device according to the invention and/or the portable machine tool according to the invention can include a number of individual elements, components, and units that deviates from a number of individual elements, components, and units cited herein in order to fulfill a mode of operation described herein.
Further advantages follow from the description of the drawings hereinafter. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will appropriately also consider the features individually and combine them into additional advantageous combinations.
Shown are:
The rapid clamping unit 18a is preferably connected to the output spindle 16a in a rotationally fixed manner. A rotational or oscillating movement of the output spindle 16a is preferably transferrable to the insertable tool 54a arranged on the rapid clamping unit 18a, the transfer being done via the rapid clamping unit 18a, in particular via the torque transmission element 20a. The torque transmission element 20a preferably includes a plurality of torque transmission projections 66a, 68a (only two torque transmission projections 66a, 68a shown in
The torque transmission element 20a preferably includes at least one axial securing projection 72a, 74a, 76a, 78a, in particular at least four axial securing projections 72a, 74a, 76a, 78a (see also
Preferably, the securing element 24a comprises a seating edge 80a, in particular four seating edges 80a (see
The securing element 24a is mounted translationally movably at the output spindle 16a, in particular along a direction extending at least substantially parallel to the output axis 22a. The securing element 24a is connected to the output spindle 16a in a rotationally fixed but axially movable manner by means of a force and/or positive connection (see also
Further, the tool receiving device 10a comprises at least one locking unit 26a for securing the output spindle 16a against a rotational movement (the locking unit 26a is only shown dashed in
The locking unit 26a preferably comprises a locking element 48a provided for a form-locked and/or force-locked connection to a further locking element 86a of the locking unit 26a in at least one state, particularly in an open state of the rapid clamping unit 18a. Locking element 48a is connected to output spindle 16a in a rotationally fixed manner. Preferably, the locking element 48a is movably mounted, in particular translationally movably mounted, along a direction extending at least substantially parallel to the output axis 22a. However, it is also contemplated that locking element 48a is movably mounted along another direction that may appear meaningful to a person skilled in the art. Preferably, the locking element 48a is integrally formed with the securing element 24a. The further locking element 86a is preferably integrally formed with the housing 52a. The locking element 48a is preferably movable as a result of actuation of the actuating element 30a, in particular directly by means of the actuating element 30a or indirectly by means of the actuating element 30a. The locking element 48a is preferably designed as an axial projection of the securing element 24a, the projection being in particular arranged on a side of the securing element 24a facing away from the torque transmission element 20a and being provided for engaging the further locking element 86a in the open state of the rapid clamping unit 18a. Preferably, the further locking element 86a is arranged fixed to the housing inside the housing 52a, in particular as a locking recess into which the locking element 48a designed as the axial projection engages to block a rotational movement of the output spindle 16a.
The tool receiving device 10a preferably comprises at least one gear unit 32a provided to convert a movement of the actuating element 30a for actuating the locking unit 26a into a movement of the securing member 24a. It is also contemplated, however, that the gear unit 32a, in particular in a design of the tool receiving device 10a independent of the locking unit 26a, is only provided to convert a movement of the actuating element 30a into a movement of the securing element 24a, in particular to transition the rapid clamping unit 18a to an open state. The gear unit 32a preferably comprises at least one gear element 34a arranged on the actuating element 30a. Preferably, the gear element 34a is arranged directly on the actuating element 30a. Preferably, movement of the actuating element 30a is directly transferable to the gear element 34a. In a pivoting movement of the actuating element 30a about the pivot axis 92a of the actuating element 30a, the gear element 34a may also be moved about the pivot axis 92a. Preferably, the actuating element 30a is connected to the gear element 34a in a rotationally fixed manner. The gear element 34a is preferably arranged on a bearing element 88a, in particular a bearing sleeve or a bearing bolt, of the actuating unit 28a to allow for a pivoting mounting of the actuating element 30a, in particular it is formed integrally with the bearing member 88a. The bearing element 88a is connected to the actuating element 30a in a rotationally fixed manner. The gear element 34a is connected to the actuating element 30a in a rotationally fixed manner (see also
The gear element 34a is preferably ramp shaped. The ramp-shaped gear element 34a is preferably provided to convert rotational movement of the actuating element 30a into a translational movement of the securing element 24a, in particular along a direction extending at least substantially parallel to the output axis 22a of the output spindle 16a. Preferably, the gear element 34a is provided to displace the securing element 24a, against the spring force of the spring element 82a, along the direction extending at least substantially parallel to the output axis 22a of the output spindle 16a, as a function of the movement of the actuating element 30a. The gear element 34a cooperates in particular with a projection 42a arranged on the securing element 24a, in particular a circumferential collar of the securing element 24a, to cause a movement of the securing element 24a as a function of an actuation of the actuating element 30a. Preferably, the securing element 24a comprises at least one ramp-shaped region formed by the projection 42a of the securing element 24a. The ramp-shaped region is designed to correspond to the ramp-shaped gear element 34a. Preferably, a slope of the ramp-shaped gear element 34a and/or of the ramp-shaped region of the securing member 24a is less than 50°, preferably less than 40°, and more preferably less than 30°. The ramp-shaped gear element 34a may be formed from an inclined plane or may be designed as a helical line. Preferably, the ramp-shaped region formed by the projection 42a of the securing element 24a is a part of the gear unit 32a.
The gear element 34a provided for moving the securing element 24a as a function of an actuation of the actuating element 30a is arranged in a non-contacting state relative to the securing member 24a in at least one operational state. Preferably, in a closed state of the rapid clamping unit 18a, the gear element 34a is arranged in a non-contacting state relative to the securing element 24a. In particular, in a closed state of the rapid clamping unit 18a, the gear element 34a is arranged spaced apart relative to the securing member 24a, in particular relative to the projection 42a of the securing member 24a, along a direction that is at least substantially parallel to the output axis 22a. To make contact between the securing element 24a, in particular between the projection 42a of the securing element 24a, and the gear element 34a, the actuating element 30a may be pivoted, in particular starting from an initial position, by an angle, in particular by an angle of less than 10°. Only after the gear element 34a is seated at securing element 24a, in particular the projection 42a of the securing element 24a, can translational movement of the securing element 24a be achieved by a rotational movement of the gear element 34a.
The tool receiving device 10a comprises at least one detent unit 50a which secures the actuating element 30a, the rapid clamping unit 18a, and/or the locking unit 26a in at least one actuated position. The detent unit 50a preferably comprises at least one detent element 90a, which is provided for securing the actuating element 30a in an actuated position by means of a form-locked and/or force-locked connection. Detent element 90a may directly act on the actuating element 30a or indirectly act on the actuating element 30a by interposing one or more components, in particular components of gear unit 32a, to secure actuating element 30a in an actuated position by means of a form-locked and/or force-locked connection. The detent unit 50a is preferably provided to secure the rapid clamping unit 18a in the open state, in particular as a result of securing the actuating element 30a in an actuated position, and to secure the locking unit 26a in a locked state in which rotational movement of the output spindle 16a is blocked by a form lock.
The detent unit 50a is designed at least partially integrally with the gear unit 32a. Preferably, the detent element 90a of the detent unit 50a is integrally designed with the ramp-shaped gear element 34a. In particular, the detent element 90a is designed as a flat surface or as a depression that sits directly against the ramp-shaped gear element 34a, in particular the oblique plane. Preferably, the securing element 24a, in particular the projection 42a of the securing element 24a, sits against the detent element 90a in a secured state. Preferably, as a result of the action of the spring force of the spring element 82a, the securing element 24a, in particular the projection 42a of the securing element 24a, is pressed against the detent element 90a in a secured state. Advantageously, a movement of the actuating element 30a may be countered by a frictional force and/or a form lock. The gear element 34a preferably includes a flattened region, in particular extending at least substantially perpendicular to the pivot axis 92a, in particular a flat surface forming the detent element 90a. Preferably, the detent element 90a forms a type of plateau on the bearing member 88a. Preferably, a shoulder (not shown in detail here) is formed between the detent element 90a and the gear element 34a, in particular to effectuate reliable holding in the secured position. Preferably, the detent element 90a is configured such that the secured position is releasable by a snap, in particular as a result of a movement of the detent element 90a counter to a direction of detent movement. By means of the described embodiment of the tool receiving device 10a, a high level of ease of operation can advantageously be achieved, in particular because two units, in particular the locking unit 26a and the rapid clamping unit 18a can be actuated substantially simultaneously as a result of actuation of the actuating element 30a. An operator can be advantageously protected from injury because, during an insertable tool change, it can be advantageously ensured that a rotation of the output spindle 16a can be reliably prevented. Simple installation and/or removal of the insertable tool 54a on the rapid clamping unit 18a can be facilitated.
The locking unit 26b preferably comprises a locking element 48b provided for a form-locked and/or force-locked connection to a further locking element 86b of the locking unit 26b, in particular connected to the output spindle 16b in a rotationally fixed manner, in at least one state, in particular in the open state of the rapid clamping unit 18b. Preferably, the locking element 48a is movably mounted, in particular translationally movably mounted, along a direction extending laterally, in particular at least substantially perpendicularly, to the output axis 22a. However, it is also contemplated that the locking element 48a is movably mounted along another direction that may appear meaningful to a person skilled in the art. The locking element 48b preferably comprises at least one transverse projection 98b, which is provided for engaging a locking recess 100b of the further locking element 86b, which in particular is connected to the output spindle 16b in a rotationally fixed manner (see also
The tool receiving device 10b comprises at least one gear unit 32b having at least one, in particular ramp-shaped, gear element 34b, 36b, preferably two, in particular ramp-shaped, gear elements 34b, 36b which is/are arranged on the locking element 48b of the locking unit 26b, in particular integrally formed with the locking element 48b of the locking unit 26b (see also FIG. 7). The ramp-shaped gear element(s) 34b, 36b arranged on the locking element 48b is/are preferably provided to cooperate with a ramp projection 102b, 104b of another gear element 38b, 40b (see also
The gear unit 32b preferably comprises at least two further gear elements 38b, 40b of an at least substantially analogous embodiment. A description of one of the further gear elements 38b, 40b can preferably read as analogous to the other of the further gear elements 38b, 40b. The further gear element 38b, 40b is translationally mounted in a housing (not shown in detail here) of the portable machine tool and is operatively connected to the actuating element 30b via the ramp-shaped gear element 34b, 36b. Preferably, the further gear element 38b, 40b cooperates with a projection 42b arranged on the securing member 24b, in particular a circumferential collar, of the securing member 24b to effect a movement of the securing member 24b as a function of an actuation of the actuation member 30b. The further gear element 38b, 40b is preferably configured as a drawbar. Preferably, the further gear element 38b, 40b comprises a driving projection 106b arranged transversely, in particular at least substantially perpendicularly, to a longitudinal axis of the further gear element 38b, 40b (see also
The tool receiving device 10b includes at least one detent unit 50b that secures the actuating element 30b, the rapid clamping unit 18b, and/or the locking unit 26b in at least one actuated position, the detent unit 50b being formed at least partially integrally with the gear unit 32b. Preferably, the detent unit 50b comprises at least one detent element 90b, in particular at least two detent elements 90b, 108b (see also
The torque transmission element 20c preferably comprises a plurality of torque transmission projections 66c, 68c (only two torque transmission projections 66c, 68c are shown in
The securing element 24c preferably comprises at least one axial securing projection 72c, 74c, 76c, 78c, in particular at least four axial securing projections 72c, 74c, 76c, 78c (see also
Preferably, the torque transmission element 20c comprises a seating edge 80c, in particular four seating edges 80c (in
Preferably, the tool receiving device 10c comprises at least one gear unit 32c (shown only dashed in
The tool receiving device 10c preferably comprises at least one guide unit 110c provided for guiding a movement of the torque transmission element 20c and for limiting a maximum travel distance, in particular at least a maximum rotational distance, of the torque transmission element 20c relative to the output spindle 16c. The guide unit 110c is preferably designed as a slotted guide, wherein at least one slot element 112c of the guide unit 110c is arranged on the output spindle 16c, in particular fixed in place, and at least one further slot element 114c of the guide unit 110c is arranged on the torque transmission element 20c, in particular fixed in place. Preferably, the guide unit 110c is provided for guiding an axial movement and rotational movement of the torque transmission element 20c relative to the output spindle 16c. The torque transmission element 20c may perform a stepped movement relative to the output spindle 16c using the guide unit 110c, such as an axial movement followed by rotational movement or vice versa, for example, or the torque transmission element 20c may perform a superimposed movement using the guide unit 110c, such as a superposition of an axial movement and rotational movement, for example, relative to the output spindle 16c. The torque transmission element 20c is movable by the guide unit 110c, preferably relative to the securing element 24c, in particular to allow the rapid clamping unit 18c to transition from an open state to a closed state or vice versa.
The guide unit 110c preferably comprises at least the slot element 112c, which is arranged, in particular, fixed in position on the output spindle 16c and which is connected to the torque transmission element 20c for co-rotation of the torque transmission element 20c. Preferably, the guide unit 110c comprises at least the slot element 114c, in particular the further slot element, comprising at least two guide track portions 116c, 118c that extend transversely relative to one another, in particular an axially extending guide track portion 116c and a circumferential guide track portion 118c. Preferably, the slot element 112c designed as a bolt that is connected to the output spindle 16c in a rotationally fixed manner. It is also contemplated, however, that the slot element 112c has a different design which would seem useful to a person skilled in the art, such as a design as an projection, as a groove, as a land, as a threaded gear or the like. Preferably, the slot element 112c extends transversely, in particular at least substantially perpendicularly, to the output axis 22c, in particular in a configuration of the slot element 112c as a bolt. Preferably, the slot element 112c extends transversely through the output spindle 16c, particularly at least up to the securing element 24c inward, or past the securing element 24c and up to the torque transfer element 20c, in particular into the further slot element 114c arranged on the torque transfer member 20c. The slot element 112c may protrude out past the output spindle 16c on one side, two sides or multiple sides. Preferably, the securing element 24c is connected to the output spindle 16c by means of the slot element 112c in a rotationally fixed manner. In particular, the securing element 24c is arranged axially secured to the output spindle 16c by way of the slot element 112c along the output axis 22c. The further slot element 114c is preferably designed as a guide groove. Preferably, the slot element 112c engages with the further slot element 114c. Preferably, the guide unit 110c comprises two further slot elements 114c arranged in a mirror-symmetrical manner on the torque transmission element 20c, each of which is designed as a guide groove. Preferably, the slot element 112c engages into both further slot elements 114c. The torque transmission element 20c is preferably connected to the output spindle 16c in a rotationally fixed manner by way of cooperation of the slot element 112c and the further slot element 114c/the further slot elements 114c at least in the closed state of the rapid clamping unit 18c. With regard to further features of the tool receiving device 10c shown in
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2021 213 564.1 | Nov 2021 | DE | national |
| 10 2022 203 059.1 | Mar 2022 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2022/079865 | 10/26/2022 | WO |
