JP2013233647A - Handheld machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new handheld machine tool which has a tool holder having an inner storage part and a lock device, and enables simple and comfortable tool replacement in every operating condition.SOLUTION: A handheld machine tool has a tool holder (150) having at least one inner storage part (290) formed for connection with a using tool (140), wherein a lock device (240) having heat conductive lock sleeves (310, 360) for locking the using tool (140) in the inner storage part (290) is correspondingly disposed in the inner storage part (290). In the handheld machine tool, at least a heat insulating protective element (252) is correspondingly disposed in the heat conductive lock sleeve (310, 360).

Description

  The present invention is a hand-held machine tool including a tool holder having at least one inner housing portion formed for coupling with a tool to be used, and locks the tool to be used in the inner housing portion to the inner housing portion. The present invention relates to a hand-held machine tool in which a lock device having a heat-conductive lock sleeve is correspondingly arranged.

  Such a known hand-held machine tool formed as a rotary impact driver (Drehschlagschrauber) has a tool holder with a polygonal inner receptacle, which is connected to the outer polygon It is possible to couple to a tool used, for example, a driver bit including a section. The tool holder is mainly composed of a metal component, and, together with a driver bit arranged in the tool holder, hits through a rotary hitting mechanism arranged correspondingly when hitting the rotary impact driver. It can be driven. In order to fix or lock the driver bit in the polygonal inner housing, a locking device is provided with a thermally conductive metal locking sleeve.

  The disadvantage in the known prior art is that during the hitting operation of such a hand-held machine tool, the high frequency vibration or vibration of the metal component of the tool holder is generated by the high frequency hit, and these vibrations or vibrations are generated. However, it can lead to heating of the metal lock sleeve above 90 ° C. This makes it difficult to handle such a hand-held machine tool, for example, when changing tools, which leads to a loss of comfort when using the hand-held machine tool.

  An object of the present invention is to provide a new hand-held machine tool that includes a tool holder having an inner housing portion and a locking device, and enables simple and comfortable tool change in all operating conditions.

  The above-described problem is a hand-held machine tool including a tool holder having at least one inner housing portion formed for coupling with a tool to be used, and locks the tool to be used in the inner housing portion to the inner housing portion. This is solved by a hand-held machine tool with a correspondingly arranged locking device with a heat-conducting locking sleeve. A protective element that is at least heat-insulating is arranged in correspondence with the heat-conductive lock sleeve.

  Therefore, the present invention realizes the provision of a hand-held machine tool that enables easy and safe handling of the hand-held machine tool in all operating states by using a heat-insulating protective element.

  Advantageously, the thermally insulating protective element at least partially surrounds the thermally conductive locking sleeve.

  Therefore, reliable and reliable heat insulation from the heat conductive lock sleeve can be realized.

  According to one aspect, the heat-insulating protective element is formed like a sleeve covering the heat-conductive locking element.

  Therefore, the present invention provides a hand-held machine tool provided with a simple and inexpensive heat-insulating protective element.

  Advantageously, the thermally insulating protective element is attached to a thermally conductive locking sleeve.

  Therefore, it is possible to provide a strong and reliable heat insulating part.

  It is advantageous if the heat-insulating protective element is crimped over the heat-transferring lock sleeve.

  Therefore, the heat insulating protective element can be attached to the heat conductive lock sleeve in a simple manner.

  According to one aspect, the heat-insulating protection element is integrally formed with the heat-conductive lock sleeve.

  Therefore, the present invention makes it possible to provide a hand-held machine tool provided with a heat-insulating protective element having high operational reliability. This is because the protective element is not removable or separable without being destroyed and is therefore not removable or separable due to mishandling of the heat transfer lock sleeve.

  Advantageously, the heat-conductive locking element is embedded in the heat-insulating protective element during plastic injection molding of the heat-insulating protective element.

  Thus, in a simple manner, a relatively inexpensive production of a lock sleeve with a heat-insulating protective element can be made possible even with a large production quantity.

  According to one aspect, the heat insulating protective element is formed to emit light.

  Therefore, the present invention makes it possible to provide a hand-held machine tool with a lock sleeve that enables a reliable and comfortable handling of the hand-held machine tool even in a relatively dark use area.

  It is advantageous if the insulating protective element comprises a heat insulating material, in particular rubber.

  Therefore, a robust and inexpensive protection element can be provided.

  The problem mentioned at the outset is a tool holder for a hand-held machine tool with at least one inner receptacle formed for coupling with a tool used, wherein the tool holder for the handheld machine tool is arranged in the inner receptacle within the inner receptacle. This is also solved by a tool holder for a hand-held machine tool, to which a locking device with a thermally conductive locking sleeve for locking the tool in use is arranged. At least a heat-insulating protective element is arranged in correspondence with the heat-transfer lock sleeve.

  In the following, the present invention will be described in detail with reference to exemplary embodiments shown in the drawings.

It is the schematic which shows the handheld machine tool by 1 aspect provided with the use tool. It is a perspective view of the driven shaft which has the tool holder shown in FIG. 1 provided with the locking device by 1 mode. FIG. 3 is a cross-sectional view of a driven shaft having the tool holder shown in FIGS. 1 and 2 and the locking device shown in FIG. 2.

  FIG. 1 shows a hand-held machine tool 100 with a tool holder 150. The handheld machine tool 100 has a housing 110 with a handgrip 126. According to the embodiment, the hand-held machine tool 100 can be mechanically and electrically connected to the charging pack 130 for power supply independent of the power supply network.

  The handheld machine tool 100 is exemplarily formed as a rechargeable rotary impact driver (Drehschlagschrauber). However, the invention is not limited to rechargeable rotary impact drivers, but rather may be used in different power tools in which the tool is rotated, and the power tool can be operated by a charge pack independent of the power supply network Or is operable depending on the power supply network, it may be used, for example, in drivers, drills, impact drills and the like. Furthermore, the present invention is not limited to electric motor driven handheld machine tools, but can be generally used in tools that can use the tool holder 150 described in FIGS. 2 and 3.

  In the casing 110, an electric drive motor 114, a transmission device 118, and a striking mechanism 122 that are fed by the charging pack 130 are disposed. The drive motor 114 can be operated, for example, switched on and off, for example via a manual switch 128 and can be of any motor type, ie an electronically commutated motor or a direct current motor. Advantageously, the drive motor 114 can be electronically open-loop controlled or closed-loop controlled, in which case it is possible to achieve reverse operation as well as pre-setting for the desired rotational speed. The function type and structure of a suitable drive motor are well known from the prior art and will not be described in further detail for the sake of brevity.

  The drive motor 114 is connected to the transmission device 118 via a correspondingly arranged motor shaft 116. The transmission 118 converts the rotation of the motor shaft 116 into the rotation of a drive member 120 provided between the transmission 118 and the striking mechanism 122, for example, a drive (input) shaft. This conversion is advantageously performed so that the drive member 120 rotates at an increased torque relative to the motor shaft 116 but at a reduced rotational speed. The drive motor 114 is illustratively disposed within the motor housing 115, and the transmission 118 is disposed within the transmission housing 119. In this case, the transmission housing 119 and the motor housing 115 are disposed in the housing 110, for example.

  The striking mechanism 122 coupled to the drive member 120 forms an extremely concentrated shock angular momentum or impulse moment (Drehimplus) and transmits it to a driven (output) shaft 124, eg, a driven spindle, eg, rotation. It is a type or rotary type striking mechanism. A tool holder 150 is provided on the driven shaft 124. The tool holder 150 is advantageously formed for mounting a tool to be used, and according to one embodiment, the tool to be used has an outer connection, for example a driver bit and a tool to have an inner connection. For example, it can also be combined with a socket wrench (Steckschluessel). Illustratively, the tool holder 150 can be coupled to a use tool 140 having an outer polygon (polygon bolt) connection 142 or a use tool having an inner polygon (polygon socket) connection.

  The working tool 140 is formed as a driver bit having an outer polygonal connecting part 142 formed as an example of a hexagonal connecting part. The outer polygonal connecting portion 142 is disposed in an appropriate inner accommodating portion (reference numeral 290 in FIG. 2) provided in the tool holder 150. Such a form of driver bit is well known from the known prior art, so a detailed description is omitted here for the sake of brevity.

  FIG. 2 shows a driven shaft 124 including the tool holder 150 shown in FIG. The proximal end region 202 with the driven cam 208 of the driven shaft 124 shown in FIG. 1 is coupled to the striking mechanism 122 of the handheld machine tool 100. According to one embodiment, an axial extension 220 is formed in the distal end region 204 of the driven shaft 124. The extended portion 220 is advantageously formed integrally with a tool holder 150 having an outer housing portion 210 and an inner housing portion 290, and is formed integrally with the tool holder 150, that is, in one piece. And is advantageous.

  According to one embodiment, the driven shaft 124 has a first section 214 that is preferably cylindrical in the direction from the driven cam 208 towards the distal end region 204. . This first section has a first diameter D1. The driven shaft 124 is reduced in diameter at the first annular shoulder 215 and transitions to the cylindrical second section 216. This second section 216 has a second diameter D2, in this case D2 <D1. In the second annular shoulder (reference numeral 396 in FIG. 3), the driven shaft 124 is again reduced in diameter and moved to the outer housing portion 210. The outer housing part 210 itself moves to the axial extension part 220 in the third annular shoulder 217.

  The tool holder 150 having the outer housing portion 210 and the inner housing portion 290 is illustratively formed integrally with the driven shaft 124, and is preferably formed integrally with the driven shaft 124, that is, in one piece. ing. The outer housing part 210 is advantageously associated with a resiliently deformable holding element 230, and the inner housing part 290 is associated with an operable locking device 240.

  The outer housing part 210 is, for example, a polygonal outer housing part, and is preferably a rectangular outer housing part. This rectangular outer housing has, for example, four sides 261, 262, 263, 264 which are preferably flat when viewed in the radial direction, and according to one embodiment are manufactured according to European or North American industry standards. Is formed to accommodate a tool, such as a socket wrench, having an inner polygonal connection. The side surfaces 261, 262, 263, and 264 are connected to each other through, for example, a chamfered corner portion.

  The outer receptacle 210 transitions to an axial extension 220 in the direction of the distal end region 204 of the driven shaft 124. The extension 220 has, for example, a terminal collar 222. The end collar 222 has a conical chamfered end towards the distal end 204. The diameter of this end collar 222 is the distance between two opposite sides of the outer receiving part 210, such as the distance between the side 261 and the side 263 or the distance between the side 262 and the side 264. It is formed smaller than.

  In order to position a tool, such as a socket wrench, manufactured according to European and North American industry standards and having an inner polygonal connection, for example a socket wrench, to the outer housing 210, it is held in the region of the axial extension 220. Element 230 is attached. The holding element 230 illustratively has a position fixing member 234. The position fixing member 234 is advantageously formed as an elastically deformable metal C-ring.

  The inner accommodating portion 290 is formed inside the driven shaft 124 as, for example, a polygonal inner accommodating portion, and serves to accommodate the driver bit 140 shown in FIG. Illustratively, the inner housing part 290 has a hexagonal inner molded part 280. In order to lock the driver bit 140 shown in FIG. 1, for example, a lock device 240 that can be operated via an operation element 250 formed in a sleeve shape is disposed in the inner housing portion 290.

  According to the first embodiment, the operating sleeve 250 has a distal end against the spring force applied by a correspondingly arranged spring element (reference numeral 242 in FIG. 3) to unlock the tool 140 used. It can slide from the locked position to the unlocked position in the direction of the region 204 (reference numeral 399 in FIG. 3). For example, the operating sleeve 250 is composed of three parts as shown in FIG. 3 and has at least one protective element 252 that is at least thermally insulating with an outer grip region 254. . According to one embodiment, the protective element 252 comprises a heat insulating material, for example a hard plastic that is thermally insulated or an elastomer, especially rubber, that is thermally insulated.

  The heat insulating protective element 252 may be formed to emit light, for example, by a material that emits light. Thereby, the self-light emission of the protection element 252 can be enabled in the use area of the hand-held machine tool 100, particularly in a relatively dark or light-use area. Further, the protective element 252 may be configured with a variety of different color configurations and / or color patterns, which may allow easy identification of the corresponding handheld machine tool.

  For example, an arbitrary cover (Blende) 256 is disposed on the operation sleeve 250. This cover 256 may be formed as a blinder and further serves to seal the locking device 240. According to one embodiment, the cover 256 may be formed from a hard plastic and is attached to the operating sleeve 250 in any form, such as screw fastening, press fitting, clamping, locking, bonding and / or welding. Has been.

  FIG. 3 shows a portion 200 of the apparatus shown in FIG. 2 with the driven shaft 124 and tool holder 150 shown in FIGS. The tool holder 150 includes a holding element 230 and a locking device 240 including an operation sleeve 250. The holding element 230 has, for example, a metal C-ring 234 and a spring element 334 which is preferably formed as an O-ring made of an elastic rubber material. The spring element 334 is arranged in a correspondingly arranged annular groove 330 provided in the axial extension 220. The O-ring 334 serves to apply a predetermined spring force in the radial direction to the C-ring 234 after assembly.

  According to one embodiment, the operating sleeve 250 has a heat insulating protective element 252 with an outer grip region 254. The protection element 252 is disposed, for example, corresponding to the heat transfer lock elements 310 and 360 formed in, for example, a sleeve shape of the lock device 240. The lock sleeves 310 and 360 serve to lock the tool 140 shown in FIG. 1 in the inner housing portion 290 having the hexagonal inner molded portion 280. For example, the metal heat transfer operation member 310 is used. have. The operation member 310 is attached to a holding member 360 which is made of, for example, metal and has a corresponding heat conductivity. An arbitrary cover 256 shown in FIG. 2 is screwed to the operation member 310, for example. Furthermore, the locking device 240 is formed, for example, as a locking element 311, 312, 313, 314, a spring element 242, for example formed as a compression spring and arranged inside the operating member 310 and the holding member 360, for example as a C-ring and And a holding element 246 disposed in an annular groove 218 provided on the outer peripheral surface of the driven shaft 124.

  The locking elements 311, 312, 313, 314 are formed, for example, like rock balls, and are formed, for example, in the region of the second shoulder 396 in the cylindrical second portion 216 of the driven shaft 124, for example at least Disposed within the first and second radial openings 305; 306. In this case, the balls 311 and 312 are introduced into the opening 305 of the driven shaft 124, and the balls 313 and 314 are introduced into the opening 306 of the driven shaft 124. In this case, the second radial opening 306 is formed on the opposite side of the first radial opening 305, for example, on the diameter. The lock balls 311, 312, 313, 314 are held in the openings 305; 306 by an inner annular shoulder 315 formed in the operation member 310, for example, and the balls 311, 312, 313, 314 are pressed to the corresponding lock positions. Is done. This lock position corresponds to the lock position of the operation sleeve 250 or the lock device 240. In the unlocking position of the operation sleeve 250 or the lock device 240, the annular shoulder 315 inside the operation member 310 releases the lock balls 311, 312, 313 and 314. Accordingly, these lock balls 311, 312, 313, 314 are removed from the inner housing portion 290 into the corresponding radial openings 305, 306 of the driven shaft 124 when the tool 140 shown in FIG. 1 is removed. It is movable radially outwardly as indicated by arrows 397 and 398 in the direction of the enlarged inner peripheral surface 316 that connects to the inner annular shoulder 315 of the operating member 310, thereby allowing the tool 140 to be used. Can be released.

  According to the first embodiment, the operation member 310 and the holding member 360 are each formed in a sleeve shape and are coupled to each other via the thread fastening portion 350. For this purpose, the operating member 310 has, for example, a female thread 319 formed at least partially in a spiral shape. The female thread 319 is screwed onto the male thread 369 formed in a spiral shape at least partially on the holding member 360 in order to form the thread fastening portion 350. However, the use of helically formed female threads and male threads is merely exemplary and should not be understood as limiting the present invention. Rather, other thread types or mounting types may be used. For example, the female thread 319 of the operating member 310 and the male thread 369 of the holding member 360 may each be formed at least partially as a concentric shaft, and in this case, the male thread 369 is formed on the female thread 319. Crimped to cover. Further, for example, the fastening of the holding member 360 and the operating member 310 can be performed by a screw screwed in a radial direction, by a pin press-fitted and / or glued or welded in the radial direction, or by a glued and / or welded transverse direction. It can be realized with pins or tangential pins. Furthermore, the operating member 310 and the holding member 360 may form an integral, ie one-piece, locking sleeve as described in EP 2039449.

  For example, the holding member 360 with the annular inner shoulder 365 facing the annular shoulder 215 is oriented in the direction towards the locking position of the operating sleeve 250, for example by a spring element 242 arranged between the restraining element 246 and the inner shoulder 365. It is biased in the direction opposite to the arrow 399. In order to allow movement of the operating sleeve 250 from this locked position to the unlocked position, the operating sleeve 250 may be gripped by a user in a grip area 254 provided in the heat-insulating protective element 252 and the holding member 360 is moved in the direction of arrow 399 against the spring force applied by spring element 242.

  According to the first embodiment, the heat-insulating protective element 252 at least partially surrounds the lock sleeves 310 and 360 formed by the operation member 310 or the holding member 360, for example, at least surrounds the operation member 310. Yes. In this case, the heat insulating protective element 252 is formed like a sleeve, for example. This sleeve can completely cover the heat-conducting lock sleeve 310, 360 and is preferably attached to the lock sleeve 310, 360.

  In order to attach the heat-insulating protection element 252 to the heat-conductive lock sleeves 310 and 360, the protection element 252 is crimped so as to cover the lock sleeves 310 and 360 or the operation member 310, that is, is press-fitted. It's okay. For example, the protective element 252 has a plurality of webs or protrusions 384 directed radially inward on the inner peripheral surface 318. These protrusions 384 mesh with corresponding notches or recesses 382 provided on the outer peripheral surface of the operation member 310.

  The above-described attachment of the heat insulating protective element 252 to the heat conductive lock sleeves 310, 360 is advantageously used when the heat insulating protective element 252 is formed from rubber. On the other hand, when the protective element 252 is manufactured from a hard plastic that is thermally insulated, the heat insulating protective element 252 is integrally formed with the heat conductive lock sleeves 310 and 360, specifically, the operation member 310 thereof. obtain. For this purpose, the heat-conductive lock sleeves 310 and 360 or the operating member 310 thereof can be embedded in the heat-insulating protective element 252 when the protective element 252 is plastic injection molded.

DESCRIPTION OF SYMBOLS 100 Handheld machine tool 110 Housing 114 Electric motor 115 Motor housing 116 Motor shaft 118 Transmission device 119 Transmission device 120 Drive member 122 Stroke mechanism 124 Driven shaft 126 Hand grip 128 Manual switch 130 Charging pack 140 Tool used 142 Outside polygonal shape Joint 150 Tool holder 202 Proximal end region 204 Distal end region 208 Driven cam 210 Outer housing 214 First section 216 Second section 218 Annular groove 220 Expansion section 222 End collar 230 Holding element 234 C ring 240 Locking device 242 Spring element 246 Holding element 250 Operation element 252 Protection element 254 Grip region 256 Cover 261 Side 262 Side 263 Side surface 264 Side surface 280 Inner molding portion 290 Inner housing portion 305 Opening 306 Opening 310 Lock sleeve operation member 311, 312, 313, 314 Lock element 315 Inner annular shoulder 316 Inner peripheral surface 318 Inner peripheral surface 319 Female thread 330 Annular groove 334 Spring element 350 Thread fastening portion 360 Lock sleeve holding member 369 Male screw 382 Concave portion 384 Protrusion 396 Second shoulder 397 direction 398 direction 399 direction

Claims (10)

A hand-held machine tool comprising a tool holder (150) having at least one inner housing (290) formed for coupling with a working tool (140), the inner housing (290) comprising In a hand-held machine tool in which a locking device (240) with a heat-conductive locking sleeve (310, 360) for locking the tool (140) used in the inner housing (290) is correspondingly arranged,
A hand-held machine tool provided with a tool holder, wherein at least a heat-insulating protective element (252) is arranged in correspondence with the heat-conductive lock sleeve (310, 360).   The hand-held machine tool according to claim 1, wherein the heat-insulating protective element (252) at least partially surrounds the heat-conductive locking sleeve (310, 360).   The hand-held machine tool according to claim 1 or 2, wherein the heat-insulating protective element (252) is formed like a sleeve covering the heat-conductive locking sleeve (310, 360).   The hand-held machine tool according to any one of claims 1 to 3, wherein the heat-insulating protective element (252) is attached to the heat-conductive lock sleeve (310, 360).   The hand-held machine tool according to any one of claims 1 to 4, wherein the heat-insulating protective element (252) is pressure-bonded so as to cover the heat-conductive lock sleeve (310, 360).   The hand-held machine tool according to any one of claims 1 to 4, wherein the heat-insulating protective element (252) is integrally formed with the heat-conductive lock sleeve (310, 360).   The heat-conductive lock sleeve (310, 360) is embedded in the heat-insulating protection element (252) by injection molding of the heat-insulating protection element (252). A hand-held machine tool according to item 1.   The hand-held machine tool according to any one of claims 1 to 7, wherein the heat-insulating protective element (252) is formed to emit light.   The hand-held machine tool according to any one of claims 1 to 8, wherein the heat insulating protective element (252) comprises a heat insulating material, for example rubber. At least one inner housing part (290) formed for coupling with a working tool (140) is provided, and the working tool (140) is placed in the inner housing part (290) in the inner housing part (290). A tool holder (150) for a hand-held machine tool (100), to which a locking device (240) with a thermally conductive locking sleeve (310, 360) for locking is arranged correspondingly,
A tool holder for a hand-held machine tool, wherein at least a heat-insulating protective element (252) is arranged in correspondence with the heat-conductive lock sleeve (310, 360).

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