Power tool

Abstract

A power tool, in particular a chipping hammer, comprising a tool mounting element for receiving and holding a tool, in particular a chisel, and a device for selectively rotating the tool mounting element. The device comprises: an impact mechanism housing having a connecting device; a coupling element having an attachment device; and a disconnect coupling element for reversibly separating the coupling element from the impact mechanism housing, wherein the coupling element is reversibly configurable in a first position or a second position, and wherein, in the first position, the coupling element is releasably connected to the impact mechanism housing such that rotation of the tool mounting element about a rotational axis is prevented, and in the second position, the coupling element is movable relative to the impact mechanism housing such that the tool mounting element is able to rotate relative to the impact mechanism housing about the rotational axis.

Description

Technical field

[0001] The invention relates to a power tool, in particular a chipping hammer, which comprises a tool mounting element for receiving and holding a tool, in particular a chisel, and a device for selectively rotating the tool mounting element. Background art

[0002] Hammer drills and / or chipping hammers of the type mentioned at the beginning are generally known from the prior art.

[0003] As a result of the continuous and invariable use of the chisel in the chipping hammer for acting on mineral materials, the abrasive action of the material may cause one-sided or irregular wear at the tip of the chisel.

[0004] To counteract this irregular wear of the chisel, the chisel must be rotated at regular intervals about its longitudinal axis. For this purpose, the chisel must be removed from the associated tool fitting, rotated and reinserted into the tool fitting. However, chipping hammers known from the prior art already have a device for rotating the tool fitting together with the chisel without removing the chisel from the chipping hammer.

[0005] However, the previously known devices on chipping hammers for rotating the tool fitting together with the chisel are generally complex, expensive and difficult to operate. Summary of the invention

[0006] The object of the invention is to provide a power tool comprising an improved device for selectively rotating a tool mounting element.

[0007] This object is achieved by a power tool, in particular a chipping hammer, which comprises a tool mounting element for receiving and holding a tool, in particular a chisel, and a device for selectively rotating the tool mounting element.

[0008] According to the invention, the device comprises: an impact mechanism housing having a connecting device; a coupling element having an attachment device; and a disconnecting coupling element for reversibly separating the coupling element from the impact mechanism housing, wherein the coupling element is reversibly adjustable to a first position or a second position, and wherein, in the first position, the coupling element is releasably connected to the impact mechanism housing such that rotation of the tool mounting element about the axis of rotation is prevented, and in the second position, the coupling element is movable relative to the impact mechanism housing such that the tool mounting element can rotate relative to the impact mechanism housing about the axis of rotation.

[0009] According to an advantageous configuration of the invention, the percussion mechanism housing may comprise connecting means and the coupling element may comprise attachment means corresponding to the connecting means, such that as a result of the connecting means being reversibly connected to the attachment means, the coupling element is releasably connected to the percussion mechanism housing.

[0010] According to a further advantageous configuration of the invention, both the connecting means and the corresponding attachment means may be configured in the form of a toothing. This simply results in a large number of setting or orientation options for a rotationally fixed form-fit between the connecting means and the attachment means.

[0011] According to an advantageous configuration of the invention, threaded means may be comprised between the disconnecting coupling element and the coupling element, such that as a result of the disconnecting coupling element rotating about the axis of rotation, the coupling element is axially displaced at least to the extent that the connecting means and the attachment means are separated from each other and the coupling element, together with the tool fitting element, is able to rotate relative to the percussion mechanism housing.

[0012] According to a further advantageous configuration of the invention, an actuating cap may be comprised, which is configured such that in the installed state, at least one part of the percussion mechanism housing, the coupling element, and the disconnecting coupling element can be received inside the actuating cap, and as a result of the actuating cap rotating about the axis of rotation, the disconnecting coupling element rotates about the axis of rotation.

[0013] According to an advantageous configuration of the invention, the actuating cap may at least comprise a retaining sleeve and an unlocking sleeve, wherein the unlocking sleeve is able to rotate relative to the retaining sleeve about the axis of rotation, and the unlocking sleeve is connected to the disconnecting coupling element for joint rotation, such that as a result of the unlocking sleeve rotating about the axis of rotation, the disconnecting coupling element also rotates about the axis of rotation.

[0014] According to a further advantageous configuration of the invention, the actuating cap may comprise at least one ventilation duct through which an air flow for cooling the internal volume of the actuating cap can flow in the axial direction. Thus, almost optimal cooling inside the actuating cap and of the components located inside the actuating cap can be achieved.

[0015] Further advantages will become apparent from the following description of the drawings. Various exemplary embodiments of the invention are shown in the drawings. The drawings, the description, and the claims contain many combinations of features. Those skilled in the art will also conveniently consider these features individually and combine them to form useful further combinations. Description of the Drawings

[0016] In the drawings, the same and similar components are denoted by the same reference numerals. In the drawings:

[0017] Figure 1 A perspective view of the front end of a power tool having a tool holding device is shown;

[0018] Figure 2 A perspective view of the tool holding device is shown;

[0019] Figure 3 A perspective view of the disconnecting element is shown;

[0020] Figure 4 A front perspective view of the coupling element is shown;

[0021] Figure 5 A rear perspective view of the coupling element is shown;

[0022] Figure 6 A further rear perspective view of the coupling element and a detailed view of the attachment device are shown;

[0023] Figure 7 A front view of the coupling element is shown;

[0024] Figure 8 A side view of the coupling element is shown;

[0025] Figure 9 A rear view of the coupling element is shown;

[0026] Figure 10 A side sectional view of the coupling element and the disconnecting element in a separated state is shown;

[0027] Figure 11 A front perspective view of the coupling element and the disconnecting element in combination is shown;

[0028] Figure 12 A rear perspective view of the coupling element and the disconnecting element in combination is shown;

[0029] Figure 13 A side sectional view of the coupling element and the disconnecting element in combination is shown;

[0030] Figure 14 A rear perspective view of the coupling element and the disconnecting element in combination inside the actuating cap is shown;

[0031] Figure 15 A sectional perspective view of the coupling element and the disconnecting element in combination inside the actuating cap is shown;

[0032] Figure 16 A rear view of the coupling element and the disconnecting element in combination inside the actuating cap is shown;

[0033] Figure 17Shows a side sectional view of the coupling element and the disconnecting coupling element combined inside the actuating cap;

[0034] Figure 18 Shows a perspective view of the impact mechanism housing with connecting means;

[0035] Figure 19 Shows a perspective view of the tool assembly element;

[0036] Figure 20 Shows a perspective sectional view of the tool assembly device;

[0037] Figure 21 Shows a detailed view of the impact mechanism housing with connecting means and the coupling element with attachment means;

[0038] Figure 22 Shows another detailed view of the impact mechanism housing with connecting means and the coupling element with attachment means; and

[0039] Figure 23 Shows a side sectional view of the tool assembly device without the actuating cap, where the impact mechanism housing and the coupling element are in a separated state. Detailed Description

[0040] Figure 1 Shows the front part of the power tool 1. In this case, the power tool is configured in the form of a chipping hammer. However, the power tool 1 can also be configured in the form of a combination hammer.

[0041] The power tool 1 configured as a chipping hammer mainly comprises a power tool housing 2, a tool assembly device 50, and a handle. The power tool housing 2 comprises a front end 2a and a rear end. The drawings only show a part of the power tool housing 2 and the front end 2a. The handle is located at the rear end of the power tool housing 2 and is used to hold and guide the power tool 1. The rear end of the power tool housing 2 and the handle are not shown in the drawings.

[0042] Furthermore, the power tool 1 comprises an impact mechanism 4 for causing the tool 5 (i.e., the chisel) located in the tool assembly device 50 to strike. The impact mechanism 4 particularly comprises an impact mechanism housing 6. The impact mechanism housing 6 can also be referred to as a guide tube housing and is basically configured as an elongated hollow cylinder having a front end 6a and a rear end 6b. The front end 6a and the rear end 6b can be referred to as components of the impact mechanism housing 6. In particular, the front end 6a is a component of the impact mechanism housing 6. The essential components of the impact mechanism 4 are arranged or positioned in the impact mechanism housing 6. The essential components of the impact mechanism 4 include, for example, an excitation piston 7, an impact piston 8, a guide tube 9, and an anvil 10 (see Figure 20 and Figure 23 ). As can be seen from Figure 18It is obvious that a connecting device 11 in the form of a tenon joint is provided at the front end 6a of the impact mechanism housing 6. As a result of the configuration, the connecting device 11 can also be referred to as a crown. The respective teeth of the connecting device 11 configured as a tenon joint extend in the axial direction M.

[0043] In addition, the components of the impact mechanism 4 are not shown in the drawings.

[0044] As described in more detail below, the impact mechanism housing 6 is positioned in the power tool 1 such that the front end 6a of the impact mechanism housing 6 or the connecting device 11 at the front end 6a of the impact mechanism housing 6 is located in the tool assembly device 50, with reference to Figure 23 .

[0045] The tool assembly device 50 is positioned at the front end 2a of the power tool housing 2 and mainly includes a tool assembly element 3, an actuating cap 13, and a device 14 for selectively rotating the tool assembly element 3.

[0046] The device 14 for selectively rotating the tool assembly element 3 mainly includes a coupling element 15, a disconnecting element 16, and a spring element 31.

[0047] The coupling element 15 is shown in Figures 4 to 9 and is basically configured as a cylindrical sleeve or a hollow cylinder. The coupling element 15 can also be referred to as a coupling collar and includes a front end 15a and a rear end 15b. An anti-rotation member 19 is included at the front end 15a of the coupling element 15. The anti-rotation member 19 further includes a plurality of axially positioned recesses 15c, with reference to Figure 4 . In this case, the recesses 15c are positioned at regular intervals around the outer lateral surface of the front end 15a of the coupling element 15. The anti-rotation member 19 having the recesses 15c is used to connect to the actuating cap 13 for combined rotation. The actuating cap 13 includes a plurality of elongated ridges 20 on its inner lateral surface, which are arranged at regular intervals and extend in the axial directions M and N.

[0048] When the elongated ridges 20 on the actuating cap 13 engage in the elongated recesses 15c in the coupling element 15 (with reference to Figure 17 ), the connection for combined rotation between the coupling element 15 and the actuating cap 13 is achieved by form fit. As a result of the recesses 15c being configured in the form of axially extending slots or grooves, when the coupling element 15 and the actuating cap 13 are connected together, the coupling element 15 can move relative to the actuating cap 13 in the axial directions M and N.

[0049] At the rear end 15b of the coupling element 15, the lateral surface has three incisions 21 which are regularly distributed around the circumference of the coupling element 15, thereby correspondingly causing three bulges 22 to be regularly distributed around the circumference of the coupling element 15. As is particularly evident from Figure 8 it is obvious that the bulges 22 are configured substantially in a wedge shape. In other words, the side surfaces 22a of each bulge 22 extend obliquely in the axial direction. The side surfaces 22a of the bulges 22 that extend obliquely in the axial direction can also be referred to as the shoulders of the bulges 22.

[0050] In addition, as is evident from Figure 5 , Figure 6 and Figure 9 the coupling element 15 includes an attachment device 23. In this case, the attachment device 23 is configured as a toothing and is positioned in the inner peripheral region 24 of the coupling element 15 which is configured as a cylindrical sleeve. The toothing is oriented such that the individual teeth of the toothing extend in the axial direction N.

[0051] Furthermore, the coupling element 15 includes a central incision 25 which can also be referred to as a through-hole. As will be described in more detail below, in the assembled or installed state, the tool assembly element 3 is introduced into the coupling element 15. In this case, the central incision 25 of the coupling element 15 is configured such that a rotatably secure connection is formed between the coupling element 15 and the tool assembly element 3 introduced into the central incision 25 of the coupling element 15. However, in the assembled or installed state with the tool assembly element 3, the coupling element 15 can move axially relative to the tool assembly element 3. In the present exemplary embodiment, the central incision 25 of the coupling element 15 is configured in an octagonal manner. However, the central incision 25 of the coupling element 15 can also have some other polygonal shape. Regarding the selection of the shape of the central incision 25 of the coupling element 15, care should be taken to ensure that a connection for combined rotation but allowing axial movement is ensured between the coupling element 15 and the tool assembly element 3 in the assembled or installed state.

[0052] The disconnect coupling element 16 is shown particularly in Figure 3 and is configured substantially as a cylindrical sleeve or ring.

[0053] On the outer lateral surface 16a of the disconnect coupling element 16, three guides 26 are included at regular intervals (i.e., offset by 120° relative to each other). In this case, each guide 26 includes two recesses 26a that extend parallel to each other in the axial direction M and a rib 26b formed therebetween. The guides 26 are used to connect the disconnect coupling element 16 to the actuating cap 13 for combined rotation.

[0054] On the inner lateral face 16b of the disconnecting element 16, three elevations 27 are positioned at regular intervals (i.e., offset by 120° relative to each other). Each of these elevations 27 is substantially configured as a wide rib having a front end 27a and a rear end 27b. At the front end 27a of the elevation 27, two chamfers 28 are provided opposite to each other such that the elevation 27 tapers in the direction M. Each chamfer 26 has a contact face 28a. The chamfers 28 and the contact faces 28a are substantially the same on each elevation 27.

[0055] In this case, the configuration of each chamfer 28 of the inner elevation 27 on the disconnecting element 16 should be selected such that the angle α of the chamfer 28 corresponds to the angle α' of the side face 22a (shoulder) of each elevation 22 of the connecting element 15. As described in more detail below, in the assembled state of the connecting element 15 and the disconnecting element 16, the contact face 28a of the chamfer 28 of the elevation 27 of the disconnecting element 16 abuts against the side face 22a (shoulder) of the elevation 22 of the connecting element 15, such that when the disconnecting element 16 moves relative to the connecting element 15, the contact face 28a of the chamfer 28 of the disconnecting element 16 can slide in a planar manner along the side face 22a (shoulder) of each elevation 22 of the connecting element 15, or the disconnecting element 16 can guide the connecting element 15 and displace it in the axial direction M, refer to Figure 12 and Figure 13 。

[0056] The connecting element 15 and the disconnecting element 16 together form a threaded device 60, because as a result of the rotation of the connecting element 15 relative to the disconnecting element 16, a linear stroke or linear movement is generated in the direction M.

[0057] The inner diameter D16 of the disconnecting element 16 is slightly larger than the outer diameter D15 of the connecting element 15, such that in the assembled state, the connecting element 15 can be introduced into the inner volume of the disconnecting element 16, refer to Figure 13 and Figure 17 。

[0058] The actuating cap 13 is shown in particular in Figure 1 、 Figure 2 and Figures 14 to 17 and is mainly used to cover the tool assembly device 50 and actuate the disconnecting element 16. The actuating cap 13 mainly comprises a first cylindrical part 13a, a second cylindrical part 13b and a third cylindrical part 13c. As is obvious from the drawings, the three cylindrical parts 13a, 13b, 13c have different diameters and are arranged in a layered manner such that the actuating cap 13 tapers in the axial direction M.

[0059] According to the first embodiment, the actuating cap 13 is configured as one piece, refer to Figures 14 to 17However, according to an alternative embodiment, the actuating cap 13 may also be configured as more than one piece. Thus, the first cylindrical portion 13a, the second cylindrical portion 13b, and the third cylindrical portion 13c may be releasably connected to each other.

[0060] According to another embodiment, the actuating cap 13 may comprise at least a retaining sleeve and an unlocking sleeve. In this case, according to a first embodiment of the actuating cap 13, the retaining sleeve substantially corresponds to the first cylindrical portion 13a and the second cylindrical portion 13b, wherein the first cylindrical portion 13a and the second cylindrical portion 13b are connected together. In this case, according to a first embodiment of the actuating cap 13, the unlocking sleeve substantially corresponds to the third cylindrical portion 13c. The unlocking sleeve is capable of rotating relative to the retaining sleeve about the axis of rotation Q in the rotational direction R. The unlocking sleeve is further connected to the disconnecting element 16 for joint rotation, such that as a result of the unlocking sleeve rotating about the axis of rotation Q, the disconnecting element 16 also rotates about the axis of rotation Q.

[0061] As is particularly evident from Figure 17 the inner lateral surface of the second cylindrical portion 13b of the actuating cap 13 has a plurality of elongate ridges 20 which are arranged at regular intervals and extend in the axial directions M, N. These elongate ridges 20 are configured such that they correspond to the recesses 15c at the front end 15a of the coupling element 15, so that in the mounted state, a connection for joint rotation but allowing axial displacement can be formed between the actuating cap 13 and the coupling element 15.

[0062] As can be seen from Figure 14 , Figure 15 and Figure 16 it is evident that the third cylindrical portion of the actuating cap 13 has three pairs of longitudinal ribs 29 which are regularly distributed (i.e., offset from each other by 120°) on the inner lateral surface. Figure 15 Only two longitudinal ribs are shown in

[0063] Figure 19The tool mounting element 3 shown is substantially configured as an elongate sleeve having a first part 3a and a second part 3b. In this case, the outer diameter of the first part 3a is slightly smaller than the outer diameter of the second part 3b. Further, the first part 3a includes an internal volume 3c for receiving a tool 5 configured as a chisel. Further, an octagonal area 3d is provided at the rear end of the first part 3a. The configuration of the octagonal area 3d of the first part 3a of the tool mounting element 3 corresponds to the configuration of the central cutout 25 in the coupling element 15. As Figure 20 and Figure 23 shown, when the tool mounting element 3 has been introduced into the coupling element 15, there is a connection for joint rotation between the tool mounting element 3 and the coupling element 15. However, relative movement between the tool mounting element 3 and the coupling element 15 in the axial directions M, N is possible. However, care should be taken to ensure that there is always a connection for joint rotation between the tool mounting element 3 and the coupling element 15, even when the tool mounting element 3 and the coupling element 15 are displaced relative to each other in the axial directions M, N.

[0064] To mount the tool mounting device 50 or the device for selectively rotating the tool mounting element 3, the coupling element 15 is first positioned in the disconnect coupling element 16 such that the contact surface 28a of each chamfer 28 of the projection 27 of the disconnect coupling element 16 abuts against the respective side 22a of the shoulder of the projection 22 of the coupling element 15, reference Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 and Figure 17 . As a result of the contact surface 28a of the chamfer 28 abutting against the side 22a of the projection 22, a force can be transmitted from the disconnect coupling element 16 to the coupling element 15 in the axial direction M.

[0065] As is apparent from Figure 20 and Figure 23 , in the installed or assembled state, the tool mounting element 3 is connected to the coupling element 15 such that the octagonal area 3d of the first part 3a of the tool mounting element 3 is positioned in the octagonal central cutout 25 in the coupling element 15. In particular in Figure 20 , the coupling element 15 is shown in a first position in which the coupling element 15 is connected to the tool mounting element 3 for joint rotation. In Figure 22 , the coupling element 15 is shown in a second position in which the coupling element 15 is not connected to the tool mounting element 3 for joint rotation and the coupling element 15 and the tool mounting element 3 can be rotated relative to each other.

[0066] Furthermore, the disconnecting element 16 is connected to the percussion mechanism housing 6 such that the toothing or teeth of the connecting means 11 of the percussion mechanism housing 6 engage with the toothing or teeth of the attachment means 23 of the coupling element 15, so that when the percussion mechanism housing 6 and the coupling element 15 are arranged at a certain axial distance from one another, there is a connection for joint rotation between the percussion mechanism housing 6 and the coupling element 15. In Figure 20 it, the percussion mechanism housing 6 and the coupling element 15 are shown at a first axial distance from one another such that there is a toothing engagement or releasable connection between the connecting means 11 of the percussion mechanism housing 6 and the attachment means 23 of the coupling element 15. Since the percussion mechanism housing 6 is connected to the power tool housing 2 of the power tool 1 for joint rotation, the coupling element 15 is also positioned for joint rotation inside the power tool housing 2 of the power tool 1 when there is a connection for joint rotation between the connecting means 11 of the percussion mechanism housing 6 and the attachment means 23 of the coupling element 15.

[0067] As Figures 20 to 23 shown, the coupling element 15, the disconnecting element 16, the tool assembly element 3 and the front end 6a of the percussion mechanism housing 6 are positioned inside the actuating cap 13. Furthermore, a pressing element 30 and a compression spring element 31 are contained inside the actuating cap 13. The pressing element 30 is at an axial distance in front of the coupling element 15 in the axial direction M. The compression spring element 31 is positioned between the pressing element 30 and the coupling element 15 such that the spring force of the compression spring element 31 acts between the pressing element 30 and the coupling element 15 and thus pushes the pressing element 30 and the coupling element 15 apart in the axial directions M, N. At the same time, the coupling element 15 is pushed onto the disconnecting element 16 in the axial direction N. In order to move the coupling element 15 in the axial direction M, the spring force of the compression spring element 31 is counteracted.

[0068] As already described above, the disconnecting element 16 is positioned in the actuating cap 13 such that these pairs of longitudinal ribs 29 on the third cylindrical part 13c of the actuating cap 13 engage in recesses in the outer lateral faces of the disconnecting element 16, reference Figure 15 . Furthermore, the coupling element 15 is positioned in the actuating cap 13 such that the elongated projection 20 on the second cylindrical part 13b of the actuating cap 13 engages with a recess 15c at the front end 15a of the coupling element 15, so that there is a connection for joint rotation between the actuating cap 13 and the coupling element 15 but allowing movement in the axial directions M, N.

[0069] To actuate the device 14 for selectively rotating the tool mounting element 3 and as a result be able to rotate the tool mounting element 3 about the axis of rotation Q in the rotational direction R, the actuating cap 13 is rotated about the axis of rotation Q. As a result of the third cylindrical part 13c of the actuating cap 13 being connected to the disconnecting element 16 for joint rotation, the disconnecting element 16 also rotates about the axis of rotation Q. The actuating cap 13 is rotated about the axis of rotation Q as far as the tool mounting element 3 is intended to be rotated about the axis of rotation Q.

[0070] When the disconnecting element 16 rotates about the axis of rotation Q, the contact surfaces 28a of the respective chamfers 28 of the three elevations 27 on the inner lateral face of the disconnecting element 16 bear against the correspondingly inclined extending lateral faces 22a (shoulders) of the elevations 22 of the connecting element 15 in the axial direction M. As a result, by means of the disconnecting element 16, the connecting element 15 is caused to rotate about the axis of rotation Q and is pushed in the axial direction M. As a result of the displacement of the connecting element 15 in the axial direction M, the toothing of the connecting device 11 of the impact mechanism housing 6 and the attachment device 23 of the connecting element 15 is separated. As is evident from Figure 23 there is still a connection or a form-fit connection for joint rotation in the region X between the connecting element 15 and the tool mounting element 3, even when the connecting element 15 and the impact mechanism housing 6 are no longer connected for joint rotation.

[0071] Figure 21 shows a state in which the connecting device 11 of the impact mechanism housing 6 and the attachment device 23 of the connecting element 15 are at an axial spacing from each other but the toothing of the connecting device 11 and the attachment device 23 has not yet been completely separated. The connecting element 15 has been rotated about the axis of rotation Q by a certain amount in the rotational direction R. In contrast, Figure 22 shows the connecting device 11 and the attachment device 23 spaced further apart in the axial direction M by a greater axial spacing than in Figure 21 . In Figure 22In the figure, the coupling element 15 has rotated by a further amount about the axis of rotation Q in the direction of rotation R. The respective tips of the teeth of the toothing of the connecting device 11 and the attachment device 23 are positioned vertically opposite one another. In this state, the coupling element 15 is pressed against the compression spring element 31 in the axial directions M, N, such that the compression spring element 31 is compressed to a certain extent. The spring force of the compression spring element 31 acts in the axial direction N against the coupling element 15. When the coupling element 15 is rotated further about the axis of rotation Q by means of the disconnecting element 16 in the direction of rotation R, the tips of the teeth of the connecting device 11 and the attachment device 23 are no longer positioned opposite one another, and as a result of the spring force of the compression spring element 31, the coupling element 15 is brought into a new orientation of rotation about the axis of rotation Q relative to the impact mechanism housing 6. The coupling element 15 and the tool mounting element 3 connected to the coupling element 15 for joint rotation, together with the tool 5 located in the tool mounting element 3, have now rotated about the axis of rotation Q relative to the impact mechanism housing 6, such that as a result, the tool 5 configured as a chisel is positioned in a changing orientation relative to the power tool 1.

[0072] As can be seen from Figure 20 the figure, the actuating cap 13 comprises a first ventilation duct 41 and a second ventilation duct 42 through which an air flow LS for cooling the interior volume of the actuating cap 13 can flow in the axial direction M. The air flow LS can also be referred to as a fluid. Furthermore, as shown in particular Figure 1 and Figure 2 the figure, the actuating cap 13 comprises a first outflow opening 43 and a second outflow opening 44. The first outflow opening 43 is positioned between the first cylindrical part 13a and the second cylindrical part 13b of the actuating cap 13, and the second outflow opening 44 is positioned between the second cylindrical part 13b and the third cylindrical part 13c of the actuating cap 13. Through the first outflow opening 43 and the second outflow opening 44, the air flow LS can flow out of the actuating cap 13. The first outflow opening 43 represents the end of the first ventilation duct 41, and the second outflow opening 44 represents the end of the second ventilation duct 42. As described above, if, according to an alternative embodiment, the actuating cap 13 is configured as a single part, the actuating cap 13 comprises only one ventilation duct and thus also only one outflow opening. An embodiment of the actuating cap configured as only one part is not shown in the figures.

Claims

1. A power tool (1) comprising a tool mounting element (3) for receiving and holding a tool (5) and a device (14) for selectively rotating the tool mounting element (3), Among them, The device (14) comprises: - at least one component (6a, 6b) of the impact mechanism housing (6), - a coupling element (15), and - a disconnecting element (16) for reversibly separating the coupling element (15) from the impact mechanism housing (6), wherein the coupling element (15) is reversibly positionable in a first position or a second position, and wherein, in the first position, the coupling element (15) is releasably connected to the impact mechanism housing (6) such that rotation of the tool mounting element (3) about a rotational axis (Q) is prevented, and in the second position, the coupling element (15) is movable relative to the impact mechanism housing (6) such that the tool mounting element (3) is able to rotate relative to the impact mechanism housing (6) about the rotational axis (Q), wherein at least one component (6a, 6b) of the impact mechanism housing (6) comprises a connecting means (11), and the coupling element (15) comprises an attaching means (23) corresponding to the connecting means (11) such that as a result of the connecting means (11) being reversibly connected to the attaching means (23), the coupling element (15) is releasably connected to at least one component (6a, 6b) of the impact mechanism housing (6), characterized in that a threaded means (60) is comprised between the disconnecting element (16) and the coupling element (15) such that as a result of the disconnecting element (16) rotating about the rotational axis (Q), the coupling element (15) is moved axially (M) at least to an extent such that the connecting means (11) and the attaching means (23) are separated from each other and the coupling element (15) together with the tool mounting element (3) is able to rotate relative to the impact mechanism housing (6).

2. The power tool (1) according to claim 1, It is characterized in that Both the connecting means (11) and the corresponding attaching means (23) are configured in the form of a toothing.

3. The power tool (1) according to claim 1 or 2, It is characterized in that comprising an actuating cap (13) configured such that in the installed state, at least one component (6a, 6b) of the impact mechanism housing (6), the coupling element (15) and the disconnecting element (16) can be received inside the actuating cap (13), and as a result of the actuating cap (13) rotating about the rotational axis (Q), the disconnecting element (16) rotates about the rotational axis (Q).

4. The power tool (1) according to claim 3, It is characterized in that The actuating cap (13) comprises at least a retaining sleeve and an unlocking sleeve, wherein the unlocking sleeve is rotatable relative to the retaining sleeve about the axis of rotation (Q), and the unlocking sleeve is connected to the disconnecting element (16) for joint rotation such that, as a result of rotation of the unlocking sleeve about the axis of rotation (Q), the disconnecting element (16) also rotates about the axis of rotation (Q).

5. The power tool (1) according to claim 3, Characterized in that, The actuating cap (13) comprises at least one ventilation duct (41, 42) through which an air flow (LS) for cooling the internal volume of the actuating cap (13) can flow in an axial direction (M).

6. The power tool (1) according to claim 1, It is characterized in that The power tool (1) is a chipping hammer.

7. The power tool (1) according to claim 1, It is characterized in that The tool (5) is a chisel.

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