Hand-held power tool

Abstract

A hand-held power tool (100) is proposed, having a tool receptacle (140) which is provided with a tubular tool holder (210) in which an application tool (190) can be locked by means of an associated locking device (200), wherein the locking device (200) locks the application tool (190) in the tool holder (210) in a locked position (201) by means of at least one locking element (250). The locking device (200) has a locking sleeve (220) and a spring-loaded pressure ring (230) which is spring-loaded via an associated spring element (280), wherein the spring-loaded pressure ring (230) loads the locking sleeve (220) into the locked position (201) and loads the at least one locking element (250) in the locked position (201) against the tool holder (210).

Description

Technical Field

[0001] The present invention relates to a handheld power tool having a tool receiving section equipped with a tubular tool holder, wherein an applied tool can be locked in the tool holder by an associated locking device, wherein the locking device locks the applied tool in the tool holder by at least one locking element in the locked position. Background Technology

[0002] Handheld machine tools with locking devices are known from the prior art. The locking device is used to lock an application tool arranged in an associated tool holder. Here, the application tool is locked in the tool holder by a locking element. The locking device has a sleeve, and the locking element is in continuous contact with the sleeve during operation of the handheld machine tool and during locking and unlocking of the application tool. Summary of the Invention

[0003] This invention relates to a handheld power tool having a tool receiving portion equipped with a tubular tool retainer. An applied tool can be locked in the tool retainer by an associated locking device, wherein the locking device, in a locked position, locks the applied tool in the tool retainer by at least one locking element. The locking device has a locking sleeve and a spring-loaded pressure ring by an associated spring element, wherein the spring-loaded pressure ring loads the locking sleeve into the locked position and, in the locked position, loads the at least one locking element against the tool retainer.

[0004] This invention enables the provision of a handheld machine tool in which a locking device with reduced wear is provided by loading the at least one locking element onto a tool retainer. This thus increases the service life of the locking device.

[0005] Preferably, a stop sleeve is provided, which has a contact surface on its inner circumference, wherein, in the locked position, the at least one locking element is loaded by a pressure ring in such a way as to abut against the contact surface.

[0006] Therefore, better wear resistance in terms of the movement of the at least one locking element can be easily achieved.

[0007] The locking sleeve preferably has a radial outer sleeve and a radial inner sleeve at one axial end, which are arranged coaxially with each other, wherein the outer sleeve and the inner sleeve are constructed as a single piece with the locking sleeve, wherein a receiving portion is constructed between the outer sleeve and the inner sleeve, and the stop sleeve is fitted into the receiving portion.

[0008] Therefore, a compact locking sleeve can be provided.

[0009] In one embodiment, the tool retainer and the locking sleeve, especially the inner sleeve, each have at least one associated slot, in which the at least one locking element is arranged.

[0010] Therefore, a safe and reliable arrangement of the at least one locking element can be achieved.

[0011] Preferably, the groove of the locking sleeve, especially the inner sleeve, is at least approximately U-shaped, with an open end facing the spring-loaded pressure ring.

[0012] Therefore, the at least one locking element can be simply arranged in the slot.

[0013] The locking sleeve, especially the outer sleeve, preferably has at least one radially inwardly pointing widening portion on its inner circumference, while the stop sleeve has at least one receiving portion belonging to the widening portion on its outer circumference for forming the anti-torsion of the locking sleeve.

[0014] Therefore, torsional resistance can be easily and uncomplicated, which prevents the locking sleeve from rotating, thereby preventing the locking element from rotating freely and preventing lateral forces that may cause wear acting on the locking element.

[0015] In one embodiment, a locking sleeve forms an internal storage portion, and the spring-loaded pressure ring is arranged in the internal storage portion.

[0016] Therefore, a safe and reliable arrangement of the pressure ring can be achieved.

[0017] The spring-loaded pressure ring preferably has at least one receiving portion on its end facing the at least one locking element for forming line contact or surface contact with the at least one locking element in the locked position.

[0018] Therefore, wear on the at least one locking element and / or locking device can be easily reduced.

[0019] Preferably, the locking sleeve has a first material, particularly plastic, while the spring-loaded pressure ring has a second material, particularly metal.

[0020] Therefore, suitable materials for reducing wear can be readily and easily provided.

[0021] Preferably, the handheld tool is constructed as an electric hammer or electric pick, wherein the tubular tool holder is a hammer tube.

[0022] Therefore, suitable handheld machine tools can be provided easily and without complexity. Attached Figure Description

[0023] The invention will be explained in detail in the following description with reference to the embodiments shown in the accompanying drawings. The drawings show:

[0024] Figure 1 This is a side view of a handheld machine tool according to the invention, which has a tool receiving portion according to the invention.

[0025] Figure 2 yes Figure 1 Longitudinal section of the tool holder in the locked position.

[0026] Figure 3 yes Figure 1 and Figure 2 Longitudinal section of the tool holder in the unlocked position.

[0027] Figure 4 It belongs to Figures 1 to 3 A three-dimensional view of the pressure ring of the tool holder.

[0028] Figure 5 It belongs to Figures 1 to 3 A perspective view of the stop sleeve of the tool holder.

[0029] Figure 6 The allocation is viewed from the first side. Figures 1 to 3 A perspective view of the locking sleeve of the tool holder.

[0030] Figure 7 It's viewed from the second side. Figure 6 A three-dimensional view of the locking sleeve.

[0031] Figure 8 yes Figure 6 and Figure 7 Longitudinal section view of the locking sleeve.

[0032] Figure 9 It is along Figure 2 The direction of arrow IX in the middle is visible. Figure 2 A cross-sectional view of the tool accommodating part in the locked position. Detailed Implementation

[0033] In the accompanying drawings, elements with the same or similar functions are given the same reference numerals and are described in detail only once.

[0034] Figure 1An exemplary handheld power tool 100 is shown, having a housing 110 in which a drive unit 120 is arranged for driving a tool holder 140. The tool holder 140 is preferably configured to accommodate an application tool 190 and is preferably a 22 mm hexagonal tool holder, but it can also be configured as an SDSmax or SDSplus tool holder. Optionally, the drive unit 120 is equipped with a driven unit 130, particularly a transmission mechanism, but the handheld power tool 100 can also be configured without the driven unit 130. Furthermore, the handheld power tool 100 preferably has an impact mechanism 150 for generating impact pulses. The impact pulses of the impact mechanism 150 can be generated in a manner known to those skilled in the art. Impact mechanisms suitable for implementing the impact mechanism 150 are well known to those skilled in the art, and therefore, for the sake of clarity and brevity, the impact mechanism 150 is not described in detail.

[0035] In the illustration, the housing 110 has a handle 105 on its side 104 opposite to the tool housing 140 and an optional additional handle 115 on its side 102 facing the tool housing 140. In the illustration, the handheld power tool 100 can be connected to the power grid via a power cord 199, but the handheld power tool 100 can also operate without a power cord, for example, via a battery pack. Preferably, the handheld power tool 100 is constructed in the form of a hammer drill or electric pick. Such handheld power tools 100 are well known from the prior art, and therefore are not described in detail for the sake of brevity.

[0036] Figure 2 Show Figure 1 The tool receiving portion 140, as shown in the figure, has a locking device 200 in a locked position 201, in which... Figure 1 An exemplary application tool 190 is locked in a tool receiving portion 140. The locking device 200 has a longitudinal extension direction 203 defining an axial direction and a radial direction 206. The tool receiving portion 140 preferably has a tubular tool holder 210 for receiving the application tool 190. Preferably, the tubular tool holder 210 has a hammer tube and is particularly preferably integrally constructed with the hammer tube.

[0037] The tool holder 210 preferably has a content receiving portion 212. An exemplary fitting is arranged in the right segment of the content receiving portion 212 as shown in the figure. Figure 1 The impact mechanism 150 has an impactor 214, while the application tool 190 is arranged in the left section of the contents 212 shown in the figure. The application tool 190 here has a fixing section 205 facing the impactor 214, and the application tool 190 is fixed in the tool holder 210 via the fixing section by a locking device 200. In addition, the tool holder 210 preferably has at least one slot 216.

[0038] Preferably, the locking device 200 is equipped with at least one locking element 250, which can be arranged in the at least one slot 216 for locking the application tool 190. Preferably, two or three locking elements 250 are provided, but more than three locking elements 250 may also be present. In the figures, the at least one locking element 250 is constructed as a sphere. However, the at least one locking element 250 can also be constructed in any other form, such as a roller or any shape having spherical segments.

[0039] Preferably, the application tool 190 can be locked in the tool holder 210 by the locking device 200. The locking device 200 here locks the application tool 190 in the tool holder 210, preferably by the at least one locking element 250, in the locked position 201.

[0040] Preferably, the locking device 200 has a locking sleeve 220 and a spring-loaded pressure ring 230 via an associated spring element 280. The spring-loaded pressure ring 230 preferably loads the locking sleeve 220 into a locked position 201. In the locked position 201, preferably, the at least one locking element 250 is loaded against the tool holder 210, preferably at least regionally loaded.

[0041] Preferably, the locking sleeve 220 has a first axial end 291 facing the impactor 214 and an opposing second axial end 292. On the second axial end 292, the locking sleeve 220 preferably has a radially arranged outer sleeve 226 and a radially arranged inner sleeve 228. The outer sleeve and the inner sleeves 226, 228 are preferably constructed as a single piece. A receiving portion 225 is preferably formed between the outer sleeve and the inner sleeves 226, 228, into which the stop sleeve 240 is fitted.

[0042] Preferably, the locking sleeve 220 has a right section 222 shown in the figure, which has a receiving portion 221 in which a spring-loaded pressure ring 230 is arranged. Section 222 is preferably arranged in the region of the impactor 214 and connected to the outer sleeve and inner sleeves 226, 228 via an operating section 224, wherein the outer sleeve and inner sleeves 226, 228 are arranged in the region of the application tool 190. Preferably, the locking sleeve 220, especially the inner sleeve 228, constitutes a positioning section 227 for positioning in the region of the slot 216 on the outer periphery 218 of the tool receiving portion 210. Here, a resting edge 223 is preferably constructed in the region of the operating section 224 to limit the pressure ring 230 along the longitudinal extension direction 203, or axially.

[0043] The tool holder 210 and locking sleeve 220, especially the inner sleeve 228, preferably each have at least one corresponding slot 216, 229. Preferably, the at least one locking element 250 is arranged in the at least one corresponding slot 216, 229. In one embodiment, the corresponding slot 229 of the locking sleeve 220, especially the inner sleeve 228, is configured to be at least approximately U-shaped, with an open end (…). Figure 6 (620 in the middle). Preferably, the open end (620) Figure 6 The pressure ring 230 is arranged facing the spring-loaded pressure ring.

[0044] The spring-loaded pressure ring 230 is preferably annularly constructed with an inner receiving portion 231 and preferably has a surrounding outer flange 236. Preferably, the outer flange 236 forms the outer periphery of the pressure ring 230. On its side facing the impactor 214, the pressure ring 230 has a resting surface 234 in the figure, through which the spring element 280 loads the pressure ring 230 toward the outer sleeve and inner sleeves 226, 228.

[0045] On its end face 235 facing at least one locking element 250, the pressure ring 230 preferably rests against the abutment edge 223 of the operating section 224, or is loaded against the abutment edge 223 by a spring element 280. Furthermore, the pressure ring 230 preferably has at least one receiving portion 232, particularly on its internal receiving portion 231, for forming line or surface contact with the at least one locking element 250 in the locked position 201. The receiving portion 232 is preferably arranged facing the locking element 250.

[0046] Furthermore, the locking sleeve 220 preferably has a first material, while the spring-loaded pressure ring 230 has a second material. The first material is preferably a plastic, especially a shape-stable plastic, such as a rigid plastic. Furthermore, the plastic may be constructed as a reinforced plastic, especially a fiber-reinforced and / or carbon fiber-reinforced plastic, such as polyamide with glass fibers. The second material is preferably a metallic material, preferably steel. In particular, the second material is preferably a hardenable material, such as a metal or a sintered material.

[0047] In addition, a stop sleeve 240 is provided. The stop sleeve 240 preferably has a disc-shaped flange 241 arranged away from the impactor 214, and a sleeve section 242 arranged facing the impactor 214. On its inner periphery 249, the stop sleeve 240, especially the sleeve section 242, preferably has a contact surface 244. The sleeve section 242 is arranged in the receiving portion 225 of the locking sleeve 220 in the locked position 201. In the locked position 201, preferably, the at least one locking element 250 is loaded by the pressure ring 230 against the contact surface 244. The contact surface 244 is preferably fan-shaped. During unlocking and / or locking, the sleeve section 242 is preferably arranged only in sections within the receiving portion 225.

[0048] A protective cover 270 is preferably arranged on the free end 209 of the tool holder 210. Furthermore, a damping element 260 is preferably arranged between the protective cover 270 and the second axial end 292 of the locking device 200.

[0049] exist Figure 2 In the locked position 201 shown, the locking element 250 is arranged in slots 216 and 229. Here, the pressure ring 230 loads the locking element 250 against the tool holder 210. The application tool 190 arranged in the tool holder 210 is here fixed or locked on the fixed section 205 by the locking element 250.

[0050] Figure 3 Show Figure 1 and Figure 2 Tool housing 140, Figure 2 The locking device 200 is in the unlocked position 301, in which the application tool 190 is unlocked in the tool receiving portion 140. It should be noted that in the unlocked position 301, the application tool 190 is not fixed in the tool receiving portion 140, but is pushed into or removed from it. Preferably, the handheld power tool 100 is not operated in the unlocked position 301.

[0051] In the unlocked position 301, the locking sleeve 220 is preferably positioned to the right in the illustration by the operator of the handheld tool 100 applying the operating section 224 in the direction of arrow 305. Here, the spring element 280 is compressed, and the locking element 250 is released. When the tool 190 is exemplarily removed from the tool holder 210, or when the tool 190 is moved in the direction of arrow 306, i.e., to the left in the illustration, the locking element 250 moves radially 206 away from the slot 216 of the tool holder 210.

[0052] In one embodiment, the locking element 250 is in direct contact with the locking sleeve 220 only in the unlocked position 301. Because this direct contact is achieved by the operator of the handheld machine tool 100 manually moving the locking sleeve 220, unnecessary wear or damage to the locking sleeve 220 can be prevented.

[0053] Figure 4 It shows Figure 2 and Figure 3 The locking device 200 has a pressure ring 230. In the figure, the pressure ring 230 has three receiving portions 232 on its end face 235 facing the locking element 250 for... Figure 2 In the locked position 201, a line contact or surface contact is formed with the at least one locking element 250. Figure 4The accommodating portion 232 shown is preferably configured to form a surface contact with the locking element 250. As described above, the accommodating portion 232 is associated with the inner accommodating portion 231. Preferably, the accommodating portions 232 are arranged uniformly in the circumferential direction. However, the accommodating portions 232 may also be arranged non-uniformly in the circumferential direction.

[0054] Figure 5 Show Figure 2 and Figure 3 The locking device 200 has a stop sleeve 240. Here, Figure 5 The disc-shaped flange 241 and sleeve section 242 are shown, the sleeve section 242 having a mating surface 244 arranged on the inner periphery 249. Furthermore, the stop sleeve 240 has at least one corresponding widening portion on its outer periphery 509. Figure 6 The receiving portion 510 (610) is used to form the anti-torsion of the locking sleeve 220. Figure 5 The diagram shows two receiving sections 510.

[0055] Figure 6 Show Figure 2 and Figure 3 The locking device 200 includes a locking sleeve 220 and its first and second axial ends 291, 292. Preferably, the sleeves 226, 228 of the locking sleeve 220, which are arranged coaxially with each other, are constructed as a single piece.

[0056] Furthermore, the locking sleeve 220, and especially the outer sleeve 226, preferably has at least one radially inwardly pointing, or rather, along the radial direction 602 of the locking sleeve 220, widening portion 610 on its inner periphery 604. In the figures, three widening portions 610 are arranged on the outer sleeve 226. The widening portions 610 are preferably arranged in… Figure 5 The stop sleeve 240 is housed in the receiving portion 510 and preferably in conjunction with... Figure 5 The receiving portion 510 forms the anti-torsion function of the locking sleeve 220. The widened portion 610 preferably has a semi-circular cross-section.

[0057] Preferably, the slot 229 of the locking sleeve 220, especially the inner sleeve 228, is configured to be at least approximately U-shaped, the U-shape having an open end 620. This open end 620 is preferably arranged facing the first axial end 291 of the locking sleeve 220. The open end 620, in particular, faces... Figure 2 , Figure 3 and Figure 4 The spring-loaded pressure ring 230 is arranged.

[0058] also, Figure 6 The control section 224 is indicated, which has an outer diameter larger than that of the outer sleeve 226 and section 222. The locking sleeve 220 is preferably loaded or moved by the operator via the control section 224. Figure 3The unlocked state is 301.

[0059] Figure 7 Shown as viewed from its first axial end 291 Figure 6 The locking sleeve 220 is shown with a slot 229 having an open end 620 that is at least approximately U-shaped. Furthermore, Figure 7 Indicate the adjacent edge 223 of section 222. Figure 4 The pressure ring 230 rests against the abutment edge with its end face 235.

[0060] Figure 8 It shows Figure 6 and Figure 7 The locking sleeve 220 and the arrangement of the slot 229 on the inner sleeve 228 are shown. Figure 8 The outer sleeve and inner sleeve 226, 228 are shown to be arranged concentrically with each other, wherein the two sleeves 226, 228 are connected to each other via abutment edge 223 in the region of operating section 224.

[0061] Figure 9 Show Figures 1 to 3 The locking device 200 is shown, and the widened portion 610 is arranged in the receiving portion 510 of the stop sleeve 240 to form the anti-torsion of the locking sleeve 220. Furthermore, Figure 9 Three locking elements 250, shown in the illustration, are loaded onto the abutment tool holder 210. Here, the locking elements 250 preferably secure the application tool 190 to its fixed section 205.

Claims

1. A handheld power tool (100) having a tool receiving section (140) equipped with a tubular tool holder (210) in which an application tool (190) can be locked by an associated locking device (200), wherein, The locking device (200) locks the application tool (190) in the tool holder (210) in the locked position (201) by at least one locking element (250), wherein the locking device (200) has a locking sleeve (220) and a spring-loaded pressure ring (230) via an associated spring element (280), wherein the spring-loaded pressure ring (230) loads the locking sleeve (220) into the locked position (201). And in the locked position (201), the at least one locking element (250) is loaded against the tool holder (210), wherein a stop sleeve (240) is provided, the stop sleeve having a contact surface (244) on its inner circumference, the contact surface having an inclined section, wherein in the locked position (201), the at least one locking element (250) is loaded by a pressure ring (230) against the inclined section of the contact surface (244).

2. The handheld machine tool according to claim 1, characterized in that, The locking sleeve (220) has a radial outer sleeve (226) and a radial inner sleeve (228) arranged coaxially with each other at one axial end (292), wherein the outer sleeve and the inner sleeve are constructed as one piece with the locking sleeve (220), and a receiving portion is constructed between the outer sleeve and the inner sleeve, into which the stop sleeve (240) is fitted.

3. The handheld machine tool according to claim 2, characterized in that, The tool holder (210) and the locking sleeve (220) each have at least one associated slot, in which the at least one locking element (250) is arranged.

4. The handheld machine tool according to claim 3, characterized in that, The matching slot of the locking sleeve (220) is approximately U-shaped, the U-shape having an open end (620) which is arranged facing the spring-loaded pressure ring (230).

5. The handheld machine tool according to any one of claims 2 to 4, characterized in that, The locking sleeve (220) has at least one radially inwardly pointing widening portion (610) on its inner periphery, and the stop sleeve (240) has at least one receiving portion corresponding to the widening portion (610) on its outer periphery (509), the receiving portion being used to form an anti-torsion portion of the locking sleeve (220).

6. The handheld machine tool according to any one of claims 1 to 4, characterized in that, The locking sleeve (220) forms a content compartment (221), and a spring-loaded pressure ring (230) is arranged in the content compartment.

7. The handheld machine tool according to any one of claims 1 to 4, characterized in that, The spring-loaded pressure ring (230) has at least one receiving portion on its end side (235) facing the at least one locking element (250) for forming line contact or surface contact with the at least one locking element (250) in the locked position (201).

8. The handheld machine tool according to any one of claims 1 to 4, characterized in that, The locking sleeve (220) has a first material, and the spring-loaded pressure ring (230) has a second material.

9. The handheld machine tool according to any one of claims 1 to 4, wherein the handheld machine tool is constructed in the form of a drill hammer or a chisel hammer, wherein, The tubular tool holder (210) is a hammer tube.

10. The handheld machine tool according to claim 3, characterized in that, The inner sleeve (228) has at least one associated slot, in which the at least one locking element (250) is arranged.

11. The handheld machine tool according to claim 10, characterized in that, The matching slot of the inner sleeve (228) is approximately U-shaped, the U-shape having an open end (620) which is arranged facing the spring-loaded pressure ring (230).

12. The handheld machine tool according to claim 5, characterized in that, The outer sleeve (226) has at least one radially inwardly pointing widening (610) on its inner circumference.

13. The handheld machine tool according to claim 8, characterized in that, The first material is plastic, and the second material is metal.

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