Patent Application
20230264334
DE 10 2011 007 660 A1 discloses a striking mechanism device for a hand-held power tool, having at least one hammer tube, the hammer tube being provided for guiding a striker and/or a drive piston.
The invention proceeds from a striking mechanism device for a hand-held power tool, having at least one hammer tube, in particular made of sheet metal, wherein the hammer tube is provided for guiding a striker and/or a drive piston.
It is proposed that the hammer tube is designed to be seamlessly longitudinally slotted over at least substantially the entire longitudinal extension of the hammer tube. The striking mechanism device is preferably designed as a pneumatic striking mechanism, in particular as a wobble striking mechanism or as an eccentric striking mechanism. The pneumatic striking mechanism device preferably comprises the striker and/or the drive piston, which is configured to drive the striker. A compression chamber of the striking mechanism device is preferably arranged between the striker and the drive piston, in which compression chamber an air cushion can be compressed during operation of the striking mechanism device designed as a pneumatic striking mechanism. The drive piston can be driven, for example, via a wobble drive of the striking mechanism device designed as a wobble striking mechanism, or via an eccentric drive of the striking mechanism device designed as an eccentric striking mechanism. The drive piston and the striker preferably have substantially the same maximum outside diameter. The hammer tube preferably has a circular cross section, in particular over the entire longitudinal extension of the hammer tube. The longitudinal extension of the hammer tube, in particular the entire longitudinal extension of the hammer tube, preferably runs in parallel with a main axis of extension of the hammer tube. A “main axis of extension” of an object is to be understood in particular as an axis which runs in parallel with a longest edge of a smallest geometric cuboid which substantially completely encloses the object. The fact that the hammer tube is designed to be “seamlessly longitudinally slotted” should be understood in particular to mean that the hammer tube, preferably a peripheral surface of the hammer tube, has at least one longitudinal slot which is preferably at least free of a glued seam, a welded seam, or the like. The hammer tube preferably has exactly one longitudinal slot. Furthermore, it is also conceivable that the hammer tube has a plurality of longitudinal slots. The longitudinal slot is preferably formed in the peripheral surface of the hammer tube. The longitudinal slot runs in particular in parallel with the main axis of extension of the hammer tube. However, it is also conceivable that the longitudinal slot runs transversely, in particular at an angle of particularly less than 90°, preferably less than 45°, and very particularly preferably less than 15°, to the main axis of extension of the hammer tube. The hammer tube is preferably designed to be rotationally symmetrical with respect to the main axis of extension of the hammer tube. In particular, the hammer tube, in particular the peripheral surface thereof, has two free longitudinal edges that delimit the longitudinal slot. The two free longitudinal edges are preferably situated opposite each other, in particular at least when viewed along a circumferential direction of the hammer tube running at least in a plane extending perpendicularly to the main axis of extension. The two free longitudinal edges are preferably designed without teeth and/or have a straight profile along a portion that corresponds to at least 25% of a maximum longitudinal extension of the hammer tube. The two free longitudinal edges preferably run in parallel with the main axis of extension of the hammer tube. However, it is also conceivable that the two free longitudinal edges run transversely, in particular at an angle of particularly less than 90°, preferably less than 45° and very particularly preferably less than 15°, to the main axis of extension of the hammer tube. The longitudinal slot is in particular free of a weld seam, an adhesive seam, or the like, preferably over the entire longitudinal extension of the hammer tube. A region between the two free longitudinal edges, in particular at least as viewed along the circumferential direction of the hammer tube, is preferably free of an adhesive seam, a welded seam, or the like, preferably over the entire longitudinal extension of the hammer tube.
The striking mechanism device preferably comprises at least one hammer tube guide element in which the hammer tube can preferably be arranged. The hammer tube is preferably arranged in the hammer tube guide element at least in one operating state. The hammer tube guide element is preferably of tubular design. The hammer tube guide element preferably has at least one circular internal cross section. A plurality of bearing ribs, on which in particular the hammer tube rests in at least one operating state, is preferably formed on an inner side of the hammer tube guide element. Each of the main axes of extension of the bearing ribs preferably runs in parallel with a main axis of extension of the hammer tube guide element. The bearing ribs preferably extend over an entire longitudinal extension of the hammer tube guide element. The longitudinal extension, in particular the entire longitudinal extension, of the hammer tube guide element preferably runs in parallel with the main axis of extension of the hammer tube guide element. The bearing ribs are preferably distributed along a circumferential direction of the hammer tube guide element which runs in a plane perpendicular to the main axis of extension of the hammer tube guide element. In particular, the bearing ribs are designed to be interrupted in some places, in particular at least as viewed along the respective main axes of extension of the bearing ribs. However, it is also conceivable that the bearing ribs, at least as viewed along the respective main axes of extension of the bearing ribs, are designed without interruption. A maximum longitudinal extension of the hammer tube guide element preferably corresponds to the maximum longitudinal extension of the hammer tube. At least in one operating state, the hammer tube is preferably at least substantially completely surrounded by the hammer tube guide element, in particular at least as viewed radially. “At least substantially completely” should be understood to mean in particular at least 50%, preferably at least 75%, and particularly preferably at least 90% of a total volume and/or a total mass of an object, in particular the hammer tube. The hammer tube guide element can be formed, for example, at least partially, preferably completely, from a light metal, in particular aluminum or the like, or from a plastics material. The hammer tube guide element can preferably be non-positively fastened to a gear housing of the striking mechanism device and/or the hand-held power tool. It is also conceivable that the hammer tube guide element is designed as a single piece together with the gear housing of the striking mechanism device and/or the hand-held power tool. “As a single piece” is to be understood in particular to mean at least connected by a material bond, for example by a welding process, an adhesive process, an injection molding process, and/or another process that appears sensible to a person skilled in the art, and/or advantageously formed as a single piece, such as by manufacture from a single casting and/or by manufacture in a one-component or multi-component injection molding process, and advantageously from a single blank.
The design according to the invention advantageously makes it possible to produce a hammer tube in a particularly simple manner. A striking mechanism device can advantageously be provided with a particularly light hammer tube. Production costs can advantageously be saved. A striking mechanism device with a particularly precisely fitting hammer tube can advantageously be provided, while at the same time being cost-effective to manufacture. A particularly comfortable and precisely fitting assembly of a hammer tube on a hammer tube guide element can advantageously be made possible.
It is also proposed that the hammer tube has two free longitudinal edges, in particular the free longitudinal edges already mentioned above, which, in particular at least in one operating state, adjoin and contact each other without a material bond. The two free longitudinal edges preferably adjoin and contact each other without a material bond over the entire longitudinal extension of the hammer tube. In particular, the two free longitudinal edges, viewed along the circumferential direction of the hammer tube, adjoin each other, in particular in such a way that the end faces of the longitudinal edges touch, or the longitudinal edges overlap and, viewed along a perpendicular to the main axis of extension of the hammer tube, adjoin each other. The two free longitudinal edges are preferably at least in contact with each other when the hammer tube is arranged in the hammer tube guide element. A maximum outside diameter of the hammer tube preferably corresponds, in particular in at least one embodiment, to a maximum inside diameter of the hammer tube guide element. The maximum inside diameter of the hammer tube guide element is particularly preferably smaller than the maximum outside diameter of the hammer tube. The dimensions of the hammer tube and/or the hammer tube guide element, in particular the maximum inside diameter of the hammer tube guide element and/or the maximum outside diameter of the hammer tube, are preferably selected in such a way that the arrangement of the hammer tube in the hammer tube guide element prevents out-of-roundness in the hammer tube, and a distance between the two free longitudinal edges or the like can be corrected. The maximum inside diameter of the hammer tube guide element is specified in particular by the bearing ribs of the hammer tube guide element. It is conceivable that by inserting the hammer tube into the hammer tube guide element, a movement of the two free longitudinal edges toward each other can be produced, in particular until the two free longitudinal edges contact each other. A cost-effective and lightweight hammer tube can advantageously be provided, which can be arranged with a particularly precise fit on a hammer tube guide element. A certain sealing of the longitudinally slotted hammer tube can advantageously be achieved.
Furthermore, it is proposed, in particular additionally or alternatively, that the hammer tube has two free longitudinal edges, in particular the free longitudinal edges already mentioned above, with a cavity or a spacing being formed between the longitudinal edges. A gap is preferably formed between the two free longitudinal edges. In particular, the two free longitudinal edges are spaced apart from each other, viewed along the circumferential direction of the hammer tube, in particular in such a way that end faces of the two free longitudinal edges are not in contact. The cavity or the spacing can preferably be formed between the two free longitudinal edges, at least when the hammer tube is not arranged in the hammer tube guide element. However, it is also conceivable that a cavity or a spacing is formed between the two free longitudinal edges when the hammer tube is arranged in the hammer tube guide element, in particular depending on a permissible tolerance range for a minimum inside diameter of the hammer tube for guiding the striker. The cavity or the spacing preferably extends along the entire longitudinal extension of the hammer tube. The two free longitudinal edges, viewed in the circumferential direction, preferably have a maximum spacing of in particular less than 1 mm, preferably less than 0.5 mm, particularly preferably less than 0.1 mm, and very particularly preferably less than 0.01 mm. The cavity or the spacing is in particular at least free of a weld seam, an adhesive seam, or the like. A high fit precision of the hammer tube can advantageously be ensured in a particularly simple manner; at the same time, the hammer tube can be produced cost-effectively.
It is also proposed that the striking mechanism device has at least one cover element which, in particular at least in one operating state, contacts an outer surface of the hammer tube and overlaps a longitudinal slot in the hammer tube—in particular, the previously mentioned longitudinal slot of the hammer tube—in such a way that a gap seal can be produced between the longitudinal slot and the cover element. The cover element preferably overlaps the longitudinal slot at least as viewed along the circumferential direction of the hammer tube. The cover element preferably overlaps the longitudinal slot over an entire longitudinal extension of the longitudinal slot. The cover element has in particular at least one main axis of extension, which preferably runs in parallel with the main axis of extension of the hammer tube and/or to the main axis of extension of the hammer tube guide element at least in one operating state. The cover element preferably overlaps the longitudinal slot when the hammer tube is arranged in the hammer tube guide element, in particular in an operating position. However, it is also conceivable, particularly in at least one embodiment, for the cover element to overlap the longitudinal slot when the hammer tube is arranged in the hammer tube guide element and when the hammer tube is separated from the hammer tube guide element. The cover element is preferably arranged between two bearing ribs of the bearing ribs, preferably at least as viewed along the circumferential direction of the hammer tube guide element, in particular at least when the hammer tube is arranged in the hammer tube guide element. The cover element is preferably provided to seal the longitudinal slot in a fluid-tight manner, in particular in an air-tight manner. The region, in particular the cavity or the spacing, between the two free longitudinal edges is preferably at least substantially, preferably completely, free of the cover element. The cover element is preferably designed differently from the hammer tube. Alternatively, however, it is conceivable for the cover element to be formed by the hammer tube, wherein at least one free longitudinal edge of the two free longitudinal edges of the hammer tube is folded back in such a way, in particular in a Z or S shape, in particular at least when viewed along the circumferential direction of the hammer tube, that a gap seal can be produced. Advantageously, it is then possible to seal a cost-effectively produced, seamlessly longitudinally slotted hammer tube. Advantageously, fluid-tightness of a hammer tube can be ensured, with a particularly high fit precision of the hammer tube at the same time.
It is further proposed that the striking mechanism device, in particular in at least one embodiment, has at least one cover element—in particular, the previously mentioned cover element—which, in particular at least in one operating state, contacts an outer surface of the hammer tube—in particular, the previously mentioned outer surface—and in particular has the aforementioned hammer tube guide element in which the hammer tube can be arranged, wherein, along a circumferential direction—in particular, the previously mentioned circumferential direction—of the hammer tube guide element, at least one recess is formed on an inner side—in particular, the previously mentioned inner side—of the hammer tube guide element, in which recess the cover element is arranged. The recess is preferably delimited by at least two bearing ribs of the bearing ribs, in particular bearing ribs which are directly adjacent along the circumferential direction of the hammer tube guide element. In at least one embodiment, in particular at least in one operating state, the cover element is preferably surrounded by the hammer tube guide element, in particular at least as viewed along a circumferential direction of the cover element that runs in a plane perpendicular to the main axis of extension of the cover element. Preferably, the cover element is covered, in particular at least in one operating state, by the hammer tube and/or the hammer tube guide element, in particular at least as viewed along a transverse axis of the cover element. The transverse axis of the cover element preferably runs perpendicularly to the main axis of extension of the cover element. Advantageously, a space-saving gap seal of a particularly cost-effective and light hammer tube—in particular, a hammer tube that is seamlessly longitudinally slotted—can be made possible. A cover element for the gap seal can advantageously be arranged in a particularly easy-to-assemble manner.
Furthermore, it is proposed that the striking mechanism device, in particular in at least one embodiment, has at least one cover element—in particular, the previously mentioned cover element—which, in particular at least in one operating state, contacts an outer surface—in particular, the previously mentioned outer surface—of the hammer tube, and a hammer tube guide element—in particular, the previously mentioned hammer tube guide element—in which the hammer tube can be arranged, wherein the hammer tube guide element has at least one elongate elevation which forms the cover. The elongate elevation preferably extends over the entire longitudinal extension of the hammer tube guide element. The elongate elevation preferably has a curvature, in particular at least as viewed along the circumferential direction of the hammer tube guide element, which corresponds to a curvature of the hammer tube, preferably the outer surface of the hammer tube, in particular at least as viewed along the circumferential direction of the hammer tube, preferably at least in a region of the longitudinal slot. The elongate elevation is preferably arranged between two bearing ribs of the bearing ribs, in particular at least as viewed along the circumferential direction of the hammer tube guide element. The elongate elevation preferably forms a gap seal, in particular in addition to or as an alternative to the cover element. By using the hammer tube guide element to seal the seamlessly longitudinally slotted hammer tube, particularly low production costs can be achieved for a striking mechanism device. Advantageously, a desired sealing of the hammer tube in the region of the longitudinal slot can be achieved, at least in one operating state, by already existing components of the striking mechanism device. A particularly robust gap seal can advantageously be provided.
It is also proposed that the striking mechanism device, in particular in at least one embodiment, has at least one cover element—in particular, the previously mentioned cover element—which contacts an outer surface of the hammer tube—in particular, the previously mentioned outer surface—with the cover element being formed by an element which is glued to the hammer tube element. The cover element is designed, for example, as an adhesive strip, adhesive tape, or the like. It is also conceivable that the cover element is designed as a strip-like component which is in particular at least partially, preferably completely, made of metal or plastics material and is preferably attached to the outer surface of the hammer tube by means of an adhesive. The cover element preferably has a curvature, at least along the circumferential direction of the cover element, which corresponds to the curvature of the hammer tube, preferably the outer surface of the hammer tube, in particular at least as viewed along the circumferential direction of the hammer tube, preferably at least in a region of the longitudinal slot. A sealing of a hammer tube that is produced cost-effectively and is light and seamlessly longitudinally slotted can advantageously be achieved, in particular even if the hammer tube is not arranged in the hammer tube guide element. Advantageously, a cover element that can be easily replaced and/or repaired can be provided. The cover element can advantageously be checked for damage and/or leaks in a particularly simple manner.
Furthermore, it is proposed that the striking mechanism device, in particular in at least one embodiment, has at least one cover element—in particular, the previously mentioned cover element—which contacts an outer surface of the hammer tube—in particular, the previously mentioned outer surface—with the cover element being formed by a rubber and/or foam element. It is conceivable that the rubber and/or foam element is designed as a pre-compressed foam sealing strip, as a rubber sealing strip, or the like. The rubber and/or foam element is preferably arranged, in particular clamped, between the hammer tube and the hammer tube guide element, in particular at least in one operating state. At least one rubber and/or foam element designed as a pre-compressed foam sealing strip is preferably provided to expand slowly over time in order to particularly preferably produce the gap seal. In at least one embodiment, a rubber and/or foam element designed as a rubber sealing strip is preferably arranged in a longitudinal groove of the hammer tube guide element, in particular in at least one operating state, and the rubber and/or foam element, at least in a state in which the hammer tube is not arranged in the hammer tube guide element, protrudes past the longitudinal groove, preferably at least as viewed along a radial axis of the hammer tube guide element. The rubber and/or foam element designed as a rubber sealing strip can preferably be compressed by the arrangement of the hammer tube in the hammer tube guide element, in order in particular to produce the gap seal. The longitudinal groove preferably extends at least over the entire longitudinal extension of the hammer tube guide element. A main axis of extension of the longitudinal groove preferably runs in parallel with the main axis of extension of the hammer tube guide element. Advantageously, a desired gap seal of a cost-effectively produced and lightweight, seamlessly slotted hammer tube can be achieved, wherein a sealing cover element can be replaced, checked for damage, and/or cleaned particularly easily and in particular in a non-destructive manner.
In addition, it is proposed that the striking mechanism device, in particular in at least one embodiment, has at least one cover element—in particular, the previously mentioned cover element—which contacts an outer surface of the hammer tube—in particular, the previously mentioned outer surface—wherein the cover element is designed as a tubular element with at least one ventilation opening arranged in a peripheral surface of the cover element, the ventilation opening being intended to align, in at least one operating state, with at least one ventilation opening formed in a peripheral surface of the hammer tube. It is conceivable that the peripheral surface of the hammer tube and/or the peripheral surface of the cover element has a plurality of ventilation openings. The hammer tube is preferably, at least in one operating state, at least substantially completely enclosed by the cover element, in particular at least as viewed radially. In particular, the hammer tube is arranged coaxially to the cover element at least in one operating state. The maximum outside diameter of the hammer tube preferably corresponds to a maximum inside diameter of the cover element. The maximum outside diameter of the cover element preferably corresponds to the maximum inside diameter of the hammer tube guide element. The maximum inside diameter of the hammer tube guide element is particularly preferably smaller than the maximum outside diameter of the cover element. The cover element is designed identically to the hammer tube, for example, in particular excluding the maximum inside and/or outside diameter and/or excluding the dimensions and/or a number of ventilation openings thereof. In particular, at least one positioning element is formed on the cover element for axial positioning and/or for positioning in a circumferential direction of the cover element which runs in a plane perpendicular to the main axis of extension of the cover element relative to the hammer tube. A plurality of positioning elements is preferably formed on the cover element, and these are distributed along the circumferential direction of the cover element. The positioning element of the cover element is preferably—and the plurality of positioning elements of the cover element is particularly preferably—formed on an axial end of the cover element. A further axial end of the cover element, which is in particular arranged remote from the axial end of the cover element, is preferably formed without positioning elements. The positioning element of the cover element is preferably designed as an outwardly directed tab. It is also conceivable for the positioning element of the cover element to be in the form of a different positioning element that appears sensible to a person skilled in the art. In particular, the positioning element of the cover element is provided to interact with a positioning element of the hammer tube for axial positioning and/or for positioning the cover element relative to the hammer tube. Advantageously, a desired gap seal of a cost-effectively produced and lightweight, seamlessly slotted hammer tube can be achieved, wherein a sealing cover element can be replaced, checked for damage, and/or cleaned particularly easily and in particular in a non-destructive manner. Proper assembly of the cover element on the hammer tube can advantageously be facilitated.
In addition, it is proposed that the striking mechanism device comprises at least one hammer tube guide element—in particular, the previously mentioned hammer tube guide element—wherein at least one positioning element—in particular, the previously mentioned positioning element—is formed on the hammer tube, which is used for axial positioning and/or for positioning in a circumferential direction—in particular, in the previously mentioned circumferential direction—of the hammer tube relative to the hammer tube guide element, wherein the positioning element is designed in particular as an outwardly directed tab. Preferably, at least a plurality of positioning elements are preferably formed on the hammer tube, and are preferably distributed along the circumferential direction of the hammer tube. The positioning element, in particular the plurality of positioning elements, is/are preferably formed on the hammer tube on an axial end of the hammer tube. A further axial end of the hammer tube, which is in particular arranged remote from the axial end of the hammer tube, is particularly preferably free of positioning elements. The positioning element is intended to interact with at least one positioning element of the hammer tube guide element for the purpose of axially positioning the hammer tube and/or for positioning in the circumferential direction of the hammer tube relative to the hammer tube guide element. At least one positioning element, preferably a plurality of positioning elements, is preferably formed on the hammer tube guide element. The positioning elements of the hammer tube guide element are preferably formed on an axial end of the hammer tube guide element. A further axial end of the hammer tube guide element, which is arranged in particular remote from the axial end of the hammer tube guide element, is preferably free of positioning elements. The positioning element of the hammer tube guide element is preferably formed on one of the bearing ribs, in particular on an axial end of this one bearing rib of the bearing ribs. The positioning element is preferably designed as a recess, latching notch, latching lug, or the like, to which the positioning element of the hammer tube preferably forms the counterpart. Preferably, a movement of the hammer tube along the circumferential direction of the hammer tube relative to the hammer tube guide element and/or an axial movement of the hammer tube relative to the hammer tube guide element is blocked in at least one direction by the interaction of the positioning element of the hammer tube with the positioning element of the hammer tube guide element. Advantageously, the cost-effectively manufactured, particularly light, seamlessly longitudinally slotted hammer tube can be mounted with a precise fit on the hammer tube guide element in a particularly comfortable manner. Improper positioning of the hammer tube relative to the hammer tube guide element can advantageously be counteracted.
Furthermore, it is proposed that the striking mechanism device has at least one clamping element and a hammer tube guide element—in particular, the previously mentioned hammer tube guide element—the clamping element being provided for axially clamping the hammer tube with the hammer tube guide element. The clamping element is designed, for example, as an elastic element, in particular as a piece of rubber, preferably as an O-ring. The clamping element is intended to rest on the positioning element, in particular on the multiple positioning elements, of the hammer tube at least in one operating state. The hammer tube is preferably clamped axially to the hammer tube guide element by the clamping element by means of a fastening, in particular a screw connection, of the hammer tube guide element to the gear housing of the striking mechanism device and/or hand-held power tool or to a flange of the striking mechanism device. The clamping element is arranged in particular between the gear housing of the striking mechanism device and/or the hand-held power tool or the flange and the hammer tube guide element. A particularly rigid and precise fit of the cover element and/or the hammer tube can advantageously be ensured. An undesired disassembly of the hammer tube can advantageously be counteracted.
The invention also proceeds from a method for producing a hammer tube—in particular, the previously mentioned hammer tube—of a striking mechanism device according to the invention. It is proposed that, in at least one method step, a longitudinal slot—in particular, the previously mentioned longitudinal slot—of the hammer tube is produced in the hammer tube over at least substantially the entire longitudinal extension of the hammer tube—in particular, over the previously mentioned longitudinal extension. The longitudinal slot is preferably produced in a bending process. It is also conceivable that the longitudinal slot is introduced into a solid tube during an extrusion process or after an extrusion process. A hammer tube can advantageously be produced at low cost, and in particular can be arranged with a particularly precise fit on a hammer tube guide element.
Furthermore, it is proposed that the longitudinal slot is produced by bending a plate-shaped metal sheet. In at least one method step, the plate-shaped metal sheet is preferably bent into a tubular shape, such that at least two free longitudinal edges of the metal sheet preferably lie opposite each other. The two opposite free longitudinal edges of the metal sheet preferably form the two free longitudinal edges of the hammer tube. A particularly light hammer tube can advantageously be produced particularly cost-effectively.
In addition, a hand-held power tool is proposed—in particular, the previously mentioned power tool—in particular a hammer drill and/or chisel hammer, having at least one striking mechanism device according to the invention. The hand-held power tool can be designed, for example, as a hammer drill, a chisel hammer, a demolition hammer, or a rotary percussion drill, or another hand-held power tool that a person skilled in the art deems appropriate. The hand-held power tool is preferably designed as a portable, in particular plug-in or battery-operated, hand-held power tool. It is also conceivable that the hand-held power tool is designed as a pneumatic hand-held power tool. The configuration according to the invention advantageously makes it possible to provide a hand-held power tool with a particularly cost-effective and lightweight striking mechanism device.
The striking mechanism device according to the invention, the method according to the invention, and/or the hand-held power tool according to the invention should not be limited to the application and embodiment described above. In particular, the striking mechanism device according to the invention, the method according to the invention and/or the hand-held power tool according to the invention can have a number of individual elements, components and units as well as method steps that differs from the number specified here in order to fulfill a function described herein. In addition, in the case of the value ranges specified in this disclosure, values within the mentioned limits are also to be considered as disclosed and usable as desired.
Further advantages result from the following description of the drawings. Six embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form meaningful further combinations.
In the drawings:
The striking mechanism device 10a is designed as a pneumatic striking mechanism, in particular as a wobble striking mechanism or as an eccentric striking mechanism. The striking mechanism device 10a preferably comprises at least one striker 16a. The striking mechanism device 10a preferably comprises a drive piston (not shown here), which is configured to drive the striker 16a. The pneumatic striking mechanism device 10a comprises at least one hammer tube 14a (cf.
The striking mechanism device 10a comprises at least one hammer tube guide element 28a, in which the hammer tube 14a can be arranged. At least in one operating state, the hammer tube 14a is arranged in the hammer tube guide element 28a (cf.
The hammer tube 14a has a longitudinal slot 26a. The longitudinal slot 26a is formed in a lateral surface 50a of the hammer tube 14a. The longitudinal slot 26a extends in parallel with the main axis of extension 48a of the hammer tube 14a. However, it is also conceivable that the longitudinal slot 26a extends transversely, in particular at an angle of in particular less than 90°, preferably less than 45° and very particularly preferably less than 15°, to the main axis of extension 48a of the hammer tube 14a. The hammer tube 14a is rotationally symmetrical to the main axis of extension 48a of the hammer tube 14a. The hammer tube 14a has two free longitudinal edges 18a, 20a. The two free longitudinal edges 18a, 20a delimit the longitudinal slot 26a. The two free longitudinal edges 18a, 20a lie opposite each other, at least when viewed along a circumferential direction of the hammer tube 14a which extends in a plane perpendicular to the main axis of extension 48a of the hammer tube 14a. The two free longitudinal edges 18a, 20a are designed without teeth and/or have a straight profile along a portion that corresponds to at least 25% of a maximum longitudinal extension of the hammer tube 14a. The two free longitudinal edges 18a, 20a run in parallel with the main axis of extension 48a of the hammer tube 14a. However, it is also conceivable that the two free longitudinal edges 18a, 20a run transversely, in particular at an angle of in particular less than 90°, preferably less than 45° and very particularly preferably less than 15°, to the main axis of extension 48a of the hammer tube 14a. The longitudinal slot 26a is free of a weld seam, an adhesive seam, or the like, in particular over the entire longitudinal extension of the hammer tube 14a. A region between the two free longitudinal edges 18a, 20a, at least as viewed along the circumferential direction of the hammer tube 14a, is free of an adhesive seam, a welded seam, or the like, in particular over the entire longitudinal extension of the hammer tube 14a.
The two free longitudinal edges 18a, 20a contact each other without a material bond, at least in one operating state. The two free longitudinal edges 18a, 20a are at least in contact with each other when the hammer tube 14a is arranged in the hammer tube guide element 28a. The two free longitudinal edges 18a, 20a contact each other without a material bond over the entire longitudinal extension of the hammer tube 14a. A maximum outside diameter of the hammer tube 14a corresponds to a maximum inside diameter of the hammer tube guide element 28a. The maximum inside diameter of the hammer tube guide element 28a is particularly preferably smaller than the maximum outside diameter of the hammer tube 14a. Dimensions of the hammer tube 14a and/or the hammer tube guide element 28a, in particular the maximum inside diameter of the hammer tube guide element 28 and/or the maximum outside diameter of the hammer tube 14a, are selected in such a way that an arrangement of the hammer tube 14a in the hammer tube guide element 28a prevents out-of-roundness in the hammer tube 14a and a distance between the two free longitudinal edges 18a, 20a or the like can be corrected. The maximum inside diameter of the hammer tube guide element 28a is specified by the bearing ribs 52a of the hammer tube guide element 28a. By inserting the hammer tube 14a into the hammer tube guide element 28a, a movement of the two free longitudinal edges 18a, 20a can be produced, in particular until the two free longitudinal edges 18a, 20a contact each other.
Alternatively or additionally, it is conceivable that a cavity or a spacing is formed between the two free longitudinal edges 18a, 20a. A gap is formed between the two free longitudinal edges 18a, 20a. The two free longitudinal edges 18a, 20 are spaced apart from each other, viewed along the circumferential direction of the hammer tube 14a, in particular in such a way that end faces of the two free longitudinal edges 18a, 20a are not in contact. The cavity or the spacing is or can be formed between the two free longitudinal edges 18a, 20a, at least when the hammer tube 14a is not arranged in the hammer tube guide element 28a. It is also conceivable that a cavity or a spacing is formed between the two free longitudinal edges 18a, 20a when the hammer tube 14a is arranged in the hammer tube guide element 28a, in particular depending on a permissible tolerance range for a minimum inside diameter of the hammer tube 14a for guiding the striker 16a. The cavity or the spacing preferably extends along the entire longitudinal extension of the hammer tube. The two free longitudinal edges, viewed in the circumferential direction, preferably have a maximum spacing of in particular less than 1 mm, preferably less than 0.5 mm, particularly preferably less than 0.1 mm, and very particularly preferably less than 0.01 mm. The cavity or the spacing is in particular at least free of a weld seam, an adhesive seam, or the like.
The striking mechanism device 10a has at least one cover element 22a which, in particular in at least one operating state, contacts an outer surface 24a of the hammer tube 14a and overlaps the longitudinal slot 26a of the hammer tube 14a in such a way that a gap seal can be produced between the longitudinal slot 26a and the cover element 22a (cf.
Alternatively, it is conceivable in at least one exemplary embodiment for the cover element 22a to be formed by the hammer tube 14a, wherein, for example, at least one free longitudinal edge 18a of the two free longitudinal edges 18a, 20a of the hammer tube 14a is folded back in such a manner, in particular in a Z or S shape, in particular at least when viewed along the circumferential direction of the hammer tube 14a, that a gap seal can be produced.
The hammer tube guide element 28a has at least one elongate elevation 30a which forms the cover element 22a. The elongate elevation 30a extends over the entire longitudinal extension of the hammer tube guide element 28a. The elongate elevation 30a preferably has a curvature, in particular as viewed along the circumferential direction of the hammer tube guide element 28a, which corresponds to a curvature of the hammer tube 14a, preferably the outer surface 24a of the hammer tube 14a, in particular as viewed along the circumferential direction of the hammer tube 14a, at least in a region of the longitudinal slot 26a. The elongate elevation 30a is arranged between two bearing ribs 52a of the bearing ribs 52a, at least as viewed along the circumferential direction of the hammer tube guide element 28a.
A plurality of positioning elements 40a is formed on the hammer tube 14a, which positioning elements are provided for axial positioning and/or for positioning in a circumferential direction of the hammer tube 14a relative to the hammer tube guide element 28a. It is also conceivable that only at least one positioning element 40a is formed on the hammer tube 14a. The positioning elements 40a are designed as outwardly directed tabs. The positioning elements 40a are distributed along the circumferential direction of the hammer tube 14a. The positioning elements 40a are formed on an axial end 58a of the hammer tube 14a. A further axial end 60a of the hammer tube 14a, which is arranged remote from the axial end 58a of the hammer tube 14a, is free of positioning elements. The positioning elements 40a are intended to interact with at least one positioning element 62a of the hammer tube guide element 28a for the purpose of axial positioning of the hammer tube 14a and/or for positioning in the circumferential direction of the hammer tube 14a relative to the hammer tube guide element 28a. A plurality of positioning elements 62a is formed on the hammer tube guide element 28a. The positioning elements 62a of the hammer tube guide element 28a are formed on an axial end 64a of the hammer tube guide element 28a. A further axial end of the hammer tube guide element 28a, which is arranged remote from the axial end 64a of the hammer tube guide element 28a, is free of positioning elements. The positioning elements 62a of the hammer tube guide element 28a are formed on the bearing ribs 52a, in particular on axial ends of the bearing ribs 52a. The positioning elements 62a of the hammer tube guide element 28a are designed as latching notches to which the positioning elements 40a of the hammer tube 14a form the counterpart. A movement of the hammer tube 14a along the circumferential direction of the hammer tube 14a relative to the hammer tube guide element 28a and/or an axial movement of the hammer tube 14a relative to the hammer tube guide element 28a is blocked in at least one direction by the interaction of the positioning elements 40a of the hammer tube 14a with the positioning elements 62a of the hammer tube guide element 28a.
The striking mechanism device 10a has at least one clamping element 42a, which is provided for axially clamping the hammer tube 14a with the hammer tube guide element 28a. The clamping element is designed, for example, as an elastic element, in particular as a piece of rubber, preferably as an O-ring. The clamping element 42a is intended to rest on the plurality of positioning elements 40a of the hammer tube 14a at least in one operating state. The hammer tube 14a is clamped axially to the hammer tube guide element 28a by the clamping element 42a by means of a fastening, in particular a screw connection, of the hammer tube guide element 28a to a flange 66a of the hand-held power tool 12a. The clamping element 42a is arranged between the flange 66a and the hammer tube guide element 28a.
Further embodiments of the invention are shown in
The cover element 22b overlaps a longitudinal slot 26b in the hammer tube 14b when the hammer tube 14b is arranged in a hammer tube guide element 28b of the striking mechanism device 10b and when the hammer tube 14b is separated from the hammer tube guide element 28b. A plurality of bearing ribs 52b, on which in particular the hammer tube 14b rests in at least one operating state, is preferably formed on an inner side 34b of the hammer tube guide element 28b. The cover element 22b is arranged between two bearing ribs 52b of the bearing ribs 52b, at least as viewed along a circumferential direction of the hammer tube guide element 28b. In at least one operating state, the cover element 22b is surrounded by the hammer tube guide element 28b, at least as viewed along a circumferential direction of the cover element 22b which runs in a plane perpendicular to a main axis of extension 48b of the cover element 22b. The cover element 22b is covered at least in one operating state by the hammer tube 14b and/or the hammer tube guide element 28b, at least as viewed along a transverse axis of the cover element 22b. The transverse axis of the cover element 22b runs perpendicularly to the main axis of extension axis 48b of the cover element 22b.
The cover element 22b is designed, for example, as an adhesive strip, adhesive tape, or the like. The cover element 22b has a curvature, at least along the circumferential direction of the cover element 22b, which corresponds to the curvature of the hammer tube 14b, preferably the outer surface 24b of the hammer tube 14b, in particular as viewed along the circumferential direction of the hammer tube 14b, preferably at least in a region of the longitudinal slot 26b.
The cover element 22c overlaps a longitudinal slot 26c in the hammer tube 14c when the hammer tube 14c is arranged in a hammer tube guide element 28c of the striking mechanism device 10c and when the hammer tube 14c is separated from the hammer tube guide element 28c. A plurality of bearing ribs 52c, on which in particular the hammer tube 14c rests in at least one operating state, is preferably formed on an inner side 34c of the hammer tube guide element 28c. The cover element 22c is arranged between two bearing ribs 52c of the bearing ribs 52c, at least as viewed along a circumferential direction of the hammer tube guide element 28c. In at least one operating state, the cover element 22c is surrounded by the hammer tube guide element 28c, at least as viewed along a circumferential direction of the cover element 22c which runs in a plane perpendicular to a main axis of extension 48c of the cover element 22c. The cover element 22c is covered at least in one operating state by the hammer tube 14c and/or the hammer tube guide element 28c, at least as viewed along a transverse axis of the cover element 22c. The transverse axis of the cover element 22c runs perpendicularly to the main extension axis 48c of the cover element 22c. The cover element 22c is designed as a strip-like component which is at least partially, preferably completely, made of metal or plastics material and is attached to the outer surface 24c of the hammer tube 14c by means of an adhesive.
At least in one operating state, the hammer tube 14f is at least substantially completely surrounded by the cover element 22f, in particular at least as viewed radially. In at least one operating state, the hammer tube 14f is arranged radially with respect to the cover element 22f. The maximum outside diameter of the hammer tube 14f corresponds to a maximum inside diameter of the cover element 22f. The maximum outside diameter of the cover element 22f corresponds to a maximum inside diameter of a hammer tube guide element (not shown here) 28f of the striking mechanism device 10f; the maximum inside diameter of the hammer tube guide element 28f is particularly preferably smaller than the maximum outside diameter of the cover element 22f. The cover element 22f is at least substantially identical to the hammer tube 14f except for a maximum inside and/or outside diameter and/or except for dimensions and/or a number of ventilation openings. Positioning elements 76f are formed on the cover element 22f, which positioning elements are provided for axial positioning and/or for positioning in a circumferential direction of the cover element 22f, which runs in a plane perpendicular to the main axis of extension 56f of the cover element 22f, relative to the hammer tube 14f. The positioning elements 76f are distributed along the circumferential direction of the cover element 22f. The plurality of positioning elements 76f are formed on an axial end 78f of the cover element 22f. A further axial end (not shown here) of the cover element 22f which is arranged remote from the axial end 78f of the cover element 22f, is designed without positioning elements. The positioning elements 76f of the cover element 22f are designed as outwardly directed tabs. It is also conceivable for the positioning elements 76f of the cover element 22f to be in the form of other positioning elements that appear sensible to a person skilled in the art. The positioning elements 76f of the cover element 22f are provided for interacting with positioning elements 40f of the hammer tube 14f for axial positioning and/or for positioning along the circumferential direction of the cover element 22f relative to the hammer tube 14f.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2020 208 757.1 | Jul 2020 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2021/066732 | 6/21/2021 | WO |
