Hand-held power tool comprising a tool holder and a locking unit

Abstract

The invention relates to a hand-held power tool comprising a housing in which a drive motor and a gearing mechanism for driving a tool holder (150) are arranged, wherein the tool holder (150) is provided with a holder sleeve (299). The hand-held power tool also comprises a locking unit (190) for locking and unlocking an insert tool (140) which can be arranged in the holder sleeve (299). The locking unit (190) is paired with at least one locking element (245) which is acted upon by a spring element (246), and the holder sleeve (299) has a spring receiving area (243) for receiving the spring element (246). According to the invention, the spring receiving area (243) is arranged at least approximately parallel to the rotational axis (201) of the tool holder (150).

Description

[0001] Description

[0002] title

[0003] Hand tool with a tool holder and a locking unit

[0004] State of the art

[0005] The present invention relates to a hand-held power tool with a housing in which a drive motor and a gear for driving a tool holder are arranged, wherein the tool holder is provided with a receiving sleeve, and with a locking unit for locking and unlocking an insert tool that can be arranged in the receiving sleeve, wherein the locking unit is assigned at least one locking element acted upon by a spring element, and wherein the receiving sleeve has a spring holder for receiving the spring element.

[0006] Such a handheld power tool with a locking unit is known from the prior art. The handheld power tool has a housing in which a drive motor and a gear for driving a tool holder are arranged. The tool holder is provided with a receiving sleeve. Furthermore, a locking unit is provided for locking and unlocking an insert tool that can be arranged in the receiving sleeve. At least one locking element acted upon by a spring element is assigned to the locking unit, wherein the receiving sleeve has a spring receptacle for receiving the spring element. The spring receptacle is arranged perpendicular to a rotational axis of the tool holder and acts on the locking element perpendicular to the tool holder into the receiving sleeve.

[0007] Disclosure of the invention

[0008] The invention relates to a handheld power tool comprising a housing in which a drive motor and a gear for driving a tool holder are arranged, wherein the tool holder is provided with a receiving sleeve, and comprising a locking unit for locking and unlocking an insert tool that can be arranged in the receiving sleeve. At least one locking element acted upon by a spring element is assigned to the locking unit, and wherein the receiving sleeve has a spring holder for receiving the spring element. The spring holder is arranged at least approximately parallel to a rotational axis of the tool holder.

[0009] The invention thus makes it possible to provide a hand-held power tool which has a compact locking unit due to the spring holder arranged at least approximately parallel to the rotation axis of the tool holder.

[0010] Preferably, the spring receptacle is arranged between an inner receptacle of the receiving sleeve and at least one bearing element of the tool holder arranged on the outer circumference of the receiving sleeve.

[0011] This makes it possible to easily arrange the spring retainer in a suitable manner to form a compact locking unit.

[0012] Preferably, the spring holder is closed at least partially by the at least one bearing element along the rotation axis of the tool holder.

[0013] This enables a safe and reliable arrangement of the spring element that can be arranged in the spring holder.

[0014] The spring holder is preferably aligned at a predetermined angle to the rotation axis of the tool holder.

[0015] This makes it easy and uncomplicated to arrange the spring holder at least approximately parallel to the rotation axis of the tool holder.

[0016] Preferably, the spring receptacle in the receiving sleeve is arranged substantially transversely to a receptacle of the locking element. This allows for a suitable arrangement of the spring receptacle relative to the locking element in a simple manner.

[0017] Preferably, the spring element is arranged at least in sections within an inner circumference of the at least one bearing element.

[0018] Thus, a compact arrangement of the spring element can be provided.

[0019] The spring element is preferably arranged at least in sections radially to the rotation axis of the tool holder between the inner receptacle of the receiving sleeve and the at least one bearing element.

[0020] This allows for a compact arrangement of the spring element in a simple and uncomplicated manner.

[0021] According to one embodiment, a recess for arranging a ring element associated with the spring element is arranged on the outer circumference of the receiving sleeve.

[0022] This enables a safe and reliable arrangement of the ring element on the receiving sleeve.

[0023] Preferably, the ring element presses the spring element into the spring receptacle.

[0024] This enables a simple and robust arrangement of the spring element in the spring holder.

[0025] According to one embodiment, the locking unit has an actuating sleeve for unlocking an insert tool that can be arranged in the tool holder, wherein the actuating sleeve is provided for releasing the locking element acted upon by the spring element.

[0026] This allows for easy unlocking. Preferably, the operating sleeve is movable in a direction away from the handheld power tool to unlock an insert tool arranged in the tool holder.

[0027] This enables safe and reliable unlocking with a comparatively short travel distance of the operating sleeve.

[0028] Preferably, the locking element is arranged in at least one state at least partially within an inner circumference of the at least one bearing element.

[0029] This enables a stable arrangement of the locking element.

[0030] The locking element is preferably arranged in at least one state radially to the rotation axis of the tool holder between the inner receptacle of the receiving sleeve and the at least one bearing element.

[0031] This enables a simple and robust arrangement of the locking element.

[0032] According to one embodiment, the locking unit is arranged at least in sections radially to the rotation axis of the tool holder between the inner receptacle of the receiving sleeve and the at least one bearing element.

[0033] This makes it easy to create a compact design for the locking unit.

[0034] Preferably, the spring receptacle is designed such that the at least one bearing element touches each other in sections on its inner circumference facing the tool holder and the spring element arranged in the spring receptacle.

[0035] This makes it easy and uncomplicated to support the spring element.

[0036] Brief description of the drawings The invention is explained in more detail in the following description with reference to exemplary embodiments shown in the drawings. They show:

[0037] Fig. 1 is a schematic view of a hand-held power tool with a tool holder and a locking unit,

[0038] Fig. 2 shows a longitudinal section through the tool holder and the locking unit of Fig. 1 in an unlocking position, as well as a plan view of an insert tool,

[0039] Fig. 3 shows a longitudinal section through the tool holder and the locking unit of Fig. 2 when inserting the insert tool of Fig. 2 into the tool holder,

[0040] Fig. 4 shows a section of a longitudinal section through the tool holder and the locking unit of Fig. 2 and Fig. 3 during an advanced insertion of the insert tool of Fig. 2 into the tool holder,

[0041] Fig. 5 shows a section of a longitudinal section through the tool holder and the locking unit of Fig. 2 to Fig. 4 in a locking position,

[0042] Fig. 6 is a longitudinal section through the tool holder and the locking unit of Fig. 2 to Fig. 5 when the insert tool is loaded from the tool holder in the locking position, and

[0043] Fig. 7 shows a section of a longitudinal section through the tool holder and the locking unit of Fig. 2 to Fig. 6 during unlocking.

[0044] Description of the embodiments

[0045] In the figures, elements with the same or comparable function are provided with identical reference symbols and are described in detail only once.

[0046] Fig. 1 shows a handheld power tool 100 provided with a tool holder 150, which has a housing 110 with a handle 126. According to one embodiment, the handheld power tool 100 can be mechanically and electrically connected to a battery pack 130 for mains-independent power supply. Illustratively, an electric drive motor 114, supplied with power by the battery pack 130, and a gear 118 are arranged in the housing 110. The drive motor 114 can be actuated, i.e. switched on and off, for example, via a handset 128 and can be any type of motor, e.g., an electronically commutated motor or a DC motor. Preferably, the drive motor 114 can be electronically controlled or regulated in such a way that both reversing operation and specifications regarding a desired rotational speed can be implemented.The functioning and construction of a suitable drive motor are sufficiently known from the state of the art, so that a detailed description of them is omitted here for the sake of brevity.

[0047] The drive motor 114 is connected via an associated motor shaft 116 to the gearbox 118, which converts rotation of the motor shaft 116 into rotation of an output shaft 124. This conversion preferably occurs such that the output shaft 124 rotates relative to the motor shaft 116 with increased torque but reduced rotational speed. The drive motor 114 is illustratively arranged in a motor housing 115. The gearbox 118 is arranged in a gearbox housing 119. The gearbox housing 119 and the motor housing 115 are arranged, by way of example, in the housing 110.

[0048] According to one embodiment, a mechanical percussion mechanism 122 is provided. The drive motor 114 is connected to the gear mechanism 118 via an associated motor shaft 116 such that rotation of the motor shaft 116 is converted into rotation of an intermediate shaft 120 provided between the gear mechanism 118 and the percussion mechanism 122. The mechanical percussion mechanism 122 and / or the gear mechanism 118 are illustratively arranged in a common gear housing 119. Alternatively, the mechanical percussion mechanism 122 can also be arranged in a separate percussion mechanism housing.

[0049] The mechanical impact mechanism 122 connected to the intermediate shaft 120 is, for example, a rotary or rotational impact mechanism that generates high-intensity, sudden rotational pulses and transmits them to an output shaft 124, e.g., an output spindle. The mechanical impact mechanism is referred to below as the "mechanical rotary impact mechanism 122." In particular, the mechanical rotary impact mechanism 122 is provided for the impact drive of the tool holder 150. The mechanical rotary impact mechanism 122 has a spring-loaded impact body (205 in Fig. 2) that is coupled to the intermediate shaft 120 and is mounted on the intermediate shaft 120 so as to be displaceable in the axial direction 102 of the gear 118.

[0050] The tool holder 150 is provided on the output shaft 124. It is preferably designed to accommodate insert tools and is preferably connectable to an insert tool 140 with an external polygonal coupling. The insert tool 140 is designed, for example, as a screwdriver bit with an external polygonal coupling, illustratively an octagonal coupling. Such a screwdriver bit is sufficiently known from the prior art, so that a detailed description is omitted here for the sake of brevity. Furthermore, a locking unit 190 is provided for locking and unlocking the insert tool 140, which is illustratively arranged in the tool holder 150.

[0051] Fig. 2 shows the tool holder 150 and the locking unit 190 of Fig. 1, wherein the locking unit 190 is illustrated in an unlocking position 200, as well as with the insert tool 140 arranged, for example, outside the tool holder 150. The tool holder 150 illustratively has a receiving sleeve 299 in which the insert tool 140 arranged therein can be locked. For this purpose, the locking unit 190 is assigned at least one locking element 245, which is acted upon by a spring element 246.

[0052] Preferably, the receiving sleeve 299 has a spring receptacle 243 for receiving the spring element 246. According to one embodiment, the spring receptacle 243 is formed as an elongated hole. Preferably, the spring receptacle 243 is milled.

[0053] Preferably, at least one spring element 246 is arranged in at least one spring receptacle 243. Preferably, two diametrically opposed spring receptacles 243, each with a spring element 246, are provided. However, any number of spring receptacles 243 arranged in the circumferential direction of the receiving sleeve 299 can be provided. According to one embodiment, the at least one, or illustratively two, spring elements 246 are designed as compression springs with an inner diameter 248. Preferably, the inner diameter 248 is smaller than a diameter 249 of the locking element 245. According to one embodiment, the spring element 246 comprises plastic with spring properties.

[0054] According to one embodiment, the locking element 245 associated with each spring element 246 is designed as a rotationally symmetrical element, such as a ball. Alternatively, the locking element 245 can also be designed as a pin.

[0055] According to the invention, the spring receptacle 243 is arranged approximately parallel to a rotational axis 201 of the tool holder 150. In particular, the spring receptacle 243 is aligned at a predetermined angle 209 to the rotational axis 201 of the tool holder 150. The angle 209 is preferably between 0° and 80°, in particular between 5° and 20°. The angle 209 is preferably 12°.

[0056] The spring receptacle 243 is preferably arranged radially between an inner receptacle 241 of the receiving sleeve 299 and at least one bearing element 231, 232 of the tool holder 150 arranged on the outer circumference 247 of the receiving sleeve 299. The spring receptacle 243 is at least partially closed off by the at least one bearing element 231, 232 along the rotation axis 201 of the tool holder 150. An inner circumference of at least one bearing element 232 facing the receiving sleeve 299 covers the spring receptacle 243. The at least one bearing element 232 preferably touches one another in sections on its inner circumference facing the tool holder 150 and the spring element 246 arranged in the spring receptacle 243. Preferably, the locking unit 190 is arranged at least in sections radially to the rotation axis 201 of the tool holder 150 between the inner receptacle 241 of the receiving sleeve 299 and the at least one bearing element 231, 232.

[0057] Illustratively, two bearing elements 231, 232 are provided, which are arranged in a bearing receptacle 230 of the housing 110. Preferably, the bearing receptacle 230 is arranged in the gear housing 119 or a percussion mechanism housing of the optional mechanical rotary percussion mechanism 122. The two bearing elements 231, 232 preferably abut one another along a longitudinal extension 203 of the tool holder 150. Preferably, the two bearing elements 231, 232 are designed as rolling bearings, in particular ball bearings. It should be noted that only one bearing element 231, 232 can also be provided.

[0058] Preferably, the spring receptacle 243 is arranged in the receiving sleeve 299 substantially transversely to a receptacle 242 of the locking element 245. Furthermore, the spring element 246 is preferably arranged at least partially within an inner circumference 298 of the at least one bearing element 231, 232. Likewise, the spring element 246 is preferably arranged at least partially radially to the rotation axis 201 of the tool holder 150 between the inner receptacle 241 of the receiving sleeve 299 and the at least one bearing element 231, 232.

[0059] Furthermore, the locking unit 190 illustratively has an actuating sleeve

[0060] 250 for unlocking the insert tool 140 that can be arranged in the tool holder 150, wherein the actuating sleeve 250 is provided for releasing the locking element 245 acted upon by the spring element 246. The operating sleeve 250 preferably has an actuating section 252 on its inner circumference facing the inner receptacle 241.

[0061] In the unlocking position 200 shown in Fig. 2, the locking element 245 partially abuts the application section 252. Furthermore, the operating sleeve 250 is fixed to an outer circumference 247 of the receiving sleeve 299 via a disc-shaped fixing element 254. A locking ring 253 is preferably assigned to the disc-shaped fixing element 254. The locking ring 253 is arranged in a circumferential groove formed on the outer circumference 247 of the receiving sleeve 299. A spring element is preferably arranged axially between the application section 252 and the disc-shaped fixing element 254.

[0062] 251. The spring element 251 is designed to act upon the operating sleeve 250 along the longitudinal extension 203 of the tool holder 150 toward at least one bearing element 231, 232.

[0063] Furthermore, a recess 262 for arranging a ring element 260 associated with the spring element 246 is preferably arranged on the outer circumference 247 of the receiving sleeve 299. The ring element 260 preferably urges the spring element 246 into the spring receptacle 243. When the spring element 246 is compressed, the ring element 260 prevents the spring element 246 from being radially pushed out toward the operating sleeve 250. Furthermore, the ring element 260 is preferably designed as an axial stop for the operating sleeve 250 or the urging element 252 of the operating sleeve 250. Furthermore, the ring element 260 is preferably designed as a visual and dirt protection device, which can prevent dirt from entering the locking unit 190. According to one embodiment, the ring element 260 is designed as an O-ring or snap ring.

[0064] Preferably, the spring receptacle 243 and / or the receptacle 242 of the locking element 245 are configured in the manner of a cylinder or truncated cone. Preferably, the tool holder 150 has at least one spring element 246 associated with the locking element 245 and at least one spring element 251 associated with the operating sleeve 250.

[0065] It should be noted that in the context of the present invention, the term "radial" refers to a direction approximately perpendicular to the longitudinal extent 203 of the tool holder 150. Furthermore, the term "axial" refers to a direction along or parallel to the longitudinal extent 203 of the tool holder 150. Thus, the radial direction 202 is oriented approximately perpendicular to the axial direction 102 of the gear 118 or along the longitudinal extent 203 of the tool holder 150. Furthermore, the axial direction 102 is oriented substantially parallel to the longitudinal extent 203 of the tool holder 150 or parallel to a rotation axis 201 of the tool holder 150.

[0066] According to one embodiment of the handheld power tool 100 with the mechanical rotary impact mechanism 122 of Fig. 1 , the mechanical rotary impact mechanism 122 has an impact body 205 and an anvil 220 that can be acted upon by the impact body 205. The anvil 220 is preferably assigned to the tool holder 150. In particular, the anvil 220 is preferably formed integrally with the tool holder 150. The mechanical rotary impact mechanism 122 generates sudden, high-intensity rotary pulses and transmits them to the output shaft 124 or, via the anvil 220, to the receiving sleeve 299. The spring-loaded impact body 205 is mounted so as to be displaceable in the axial direction 102 of the gear 118. Such a mechanical rotary impact mechanism 122 is sufficiently known from the prior art, so that a detailed description is omitted here for the sake of brevity. Furthermore, Fig. 2 shows the insert tool 140, which is illustratively designed as a bit tool.The insert tool 140 has a locking region 210. As described in Fig. 1, the locking region 210 has an external polygon. For locking with the at least one locking element 245, the locking region 210 has a locking groove 211 on its outer circumference.

[0067] Fig. 3 shows the tool holder 150 and the locking unit 190 of Fig. 1 and Fig. 2 during insertion of the insert tool 140 along an arrow 301 into the inner receptacle 241 of the tool holder 150. Illustratively, the locking region 210 is arranged in sections in the inner receptacle 241 of the receiving sleeve 299. The diametrically opposite locking elements 245 are not yet loaded in Fig. 3.

[0068] During such insertion, only the insert tool 140 is inserted into the internal receptacle 241. The operating sleeve 250 does not have to be actuated in a predetermined direction by an operator of the hand-held power tool 100 of Fig. 1.

[0069] Fig. 4 shows the tool holder 150 and the locking unit 190 of Fig. 2 and Fig. 3 in a position 499, with a more advanced insertion of the insert tool 140 in the direction of arrow 301 into the inner receptacle 241 of the tool holder 150 compared to Fig. 2. In this case, the locking region 210, or an edge 410 of the insert tool 140 assigned to an end face of the locking region 210, acts on the diametrically arranged locking elements 245 from the inner receptacle 241 toward the outer circumference 247 of the receiving sleeve 299. The locking elements 245 are pressed against the spring elements 246 against a spring force of the spring elements 246. The operating sleeve 250 remains essentially stationary.

[0070] In position 499 shown in Fig. 4, the locking element 245 shown is arranged on an inner circumference of the ring element 260 facing the locking element 245. Furthermore, the locking element 245 is arranged at least partially within the inner circumference 298 of the at least one bearing element 231, 232. Furthermore, the locking element 245 is preferably arranged radially to the rotation axis 201 of the tool holder 150 between the inner receptacle 241 of the receiving sleeve 299 and the at least one bearing element 231, 232.

[0071] Fig. 5 shows the tool holder 150 and the locking unit 190 from Fig. 2 to Fig. 4 in a locking position 500. In the locking position 500, the insert tool 140 has been moved in the direction of arrow 301 into the inner receptacle 241 compared to Fig. 2 to Fig. 4, so that the locking portion 210 is arranged in the inner receptacle 241. The locking element 245 locks the insert tool 140 to the locking groove 211 in the inner receptacle 241 of the tool holder 150. The locking element 245 is urged against its receptacle 242 by the spring element 246. At the same time, the loading section 252 of the operating sleeve 250 presses the locking element 245 into the locking groove 210 of the insert tool 140. The locking element 245 is arranged radially between the insert tool 140 and the loading section 252.Here, the locking element 245 is preferably arranged axially next to the at least one bearing element 231, 232.

[0072] Fig. 6 shows the tool holder 150 and the locking unit 190 of Fig. 2 to Fig. 5 in the locking position 500, wherein an axial force 601 acts on the insert tool 140 out of the internal receptacle 241. The axial force 601 symbolizes, for example, a pulling action on the insert tool 140. In this case, the application section 252 acts on the locking element 245 against the locking groove 211 of the insert tool 140, whereby the latter is locked in the internal receptacle 241.

[0073] Fig. 7 shows the tool holder 150 and the locking unit 190 from Fig. 2 to Fig. 5 when the insert tool 140 is unlocked. For unlocking, the operating sleeve 250 is actively moved axially away from the handheld power tool 100 of Fig. 1 in the direction of an arrow 701 by a user of the handheld power tool 100 of Fig. 1, and in the process the insert tool 140 is also moved out of the tool holder 150 in the direction of arrow 701. In the process, the spring element 251 of the operating sleeve 250 is compressed, as a result of which the loading section 252 releases the locking element 245. As a result, the locking element 245 moves along its receptacle 242 out of the inner receptacle 241, preferably approximately radially, as a result of which the locking element 245 is finally arranged axially next to the loading section 252. In particular, the locking element 245 is arranged in sections in the axial direction 102 between the ring element 260 and the loading section 252.

Claims

Claims 1. Hand-held power tool (100) with a housing (110) in which a drive motor (114) and a gear (118) for driving a tool holder (150) are arranged, wherein the tool holder (150) is provided with a receiving sleeve (299), and with a locking unit (190) for locking and unlocking an insert tool (140) that can be arranged in the receiving sleeve (299), wherein the locking unit (190) is assigned at least one locking element (245) acted upon by a spring element (246), and wherein the receiving sleeve (299) has a spring holder (243) for receiving the spring element (246), characterized in that the spring holder (243) is arranged at least approximately parallel to a rotation axis (201) of the tool holder (150).

2. Hand tool according to claim 1, characterized in that the spring receptacle (243) is arranged between an inner receptacle (241) of the receiving sleeve (299) and at least one bearing element (231, 232) of the tool holder (150) arranged on the outer circumference (247) of the receiving sleeve (299).

3. Hand tool according to claim 2, characterized in that the spring holder (243) is closed at least in regions along the rotation axis (201) of the tool holder (150) by the at least one bearing element (231, 232).

4. Hand tool according to one of the preceding claims, characterized in that the spring holder (243) is aligned at a predetermined angle (209) to the rotation axis (201) of the tool holder (150).

5. Hand tool according to one of the preceding claims, characterized in that the spring receptacle (243) in the receiving sleeve (299) is arranged substantially transversely to a receptacle (242) of the locking element (245) is arranged.

6. Hand tool according to one of the preceding claims, characterized in that the spring element (246) is arranged at least in sections within an inner circumference (298) of the at least one bearing element (231, 232).

7. Hand tool according to one of the preceding claims, characterized in that the spring element (246) is arranged at least in sections radially to the rotation axis (201) of the tool holder (150) between the inner receptacle (241) of the receiving sleeve (299) and the at least one bearing element (231, 232).

8. Hand tool according to one of the preceding claims, characterized in that a recess (262) for arranging a ring element (260) associated with the spring element (246) is arranged on the outer circumference (247) of the receiving sleeve (299).

9. Hand tool according to claim 8, characterized in that the ring element (260) urges the spring element (246) into the spring receptacle (243).

10. Hand tool according to one of the preceding claims, characterized in that the locking unit (190) has an actuating sleeve (250) for unlocking an insert tool (140) that can be arranged in the tool holder (150), wherein the actuating sleeve (250) is provided for releasing the locking element (245) acted upon by the spring element (246).

11. Hand tool according to claim 9, characterized in that the operating sleeve (250) is movable along a direction (701) pointing away from the hand tool (100) in order to unlock an insert tool (140) arranged in the tool holder (150).

12. Hand tool according to one of claims 2 to 11, characterized in that the locking element (245) in at least one state (499) is arranged at least in sections within an inner circumference (298) of the at least one bearing element (231, 232).

13. Hand tool according to one of claims 2 to 12, characterized in that the locking element (245) is arranged in at least one state (499) radially to the rotation axis (201) of the tool holder (150) between the inner receptacle (241) of the receiving sleeve (299) and the at least one bearing element (231, 232).

14. Hand tool according to one of claims 2 to 13, characterized in that the locking unit (190) is arranged at least in sections radially to the rotation axis (201) of the tool holder (150) between the inner receptacle (241) of the receiving sleeve (299) and the at least one bearing element (231, 232).

15. Hand tool according to one of claims 2 to 14, characterized in that the spring holder (243) is designed such that the at least one bearing element (232) on its inner circumference facing the tool holder (150) and the spring element (246) arranged in the spring holder (243) touch each other in sections.

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