Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
  • B25B23/0007—Connections or joints between tool parts
  • B25B23/0035—Connection means between socket or screwdriver bit and tool
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T279/00—Chucks or sockets
  • Y10T279/17—Socket type
  • Y10T279/17666—Radially reciprocating jaws
  • Y10T279/17692—Moving-cam actuator
  • Y10T279/17743—Reciprocating cam sleeve
  • Y10T279/17752—Ball or roller jaws
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T279/00—Chucks or sockets
  • Y10T279/20—Chucks or sockets with safety feature
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T408/00—Cutting by use of rotating axially moving tool
  • Y10T408/94—Tool-support
  • Y10T408/95—Tool-support with tool-retaining means
  • Y10T408/953—Clamping jaws

Definitions

• Lathe for example in the form of a hand drill, an impact drill, a hammer drill or a cordless screwdriver
• the invention relates to a lathe, which can be a hand drill, an impact drill, a hammer drill or a cordless screwdriver, which is operatively connected to a drive motor accommodated within a machine housing and led out of the machine housing, and a tool holder with a tool clamping device for releasable coupling a drill, a screwdriver bit or a similar tool with the drive shaft.
• a lathe which can be a hand drill, an impact drill, a hammer drill or a cordless screwdriver, which is operatively connected to a drive motor accommodated within a machine housing and led out of the machine housing, and a tool holder with a tool clamping device for releasable coupling a drill, a screwdriver bit or a similar tool with the drive shaft.
• Lathes of this type are known, but suffer from the lack of cumbersome handling, in particular with regard to a quick and easy tool change.
• hand drills and impact drills are generally equipped with key-operated toothed ring drill chucks, by means of which primarily drilling tools can be clamped with round shanks.
• the operation of such clamping futter is linked to the availability of a suitable key and is also cumbersome and time-consuming.
• the invention is intended to create a lathe of the aforementioned type and purpose with a tool holder and tool clamping device which is improved compared to the prior art and in which particularly simple clamping and quick tool change can be achieved without the risk of accidents which can be observed in known systems.
• the tool holder with the tool clamping device is indirectly integrated into the lathe by extending a polygonal longitudinal recess, in particular a hexagonal recess, into the drive shaft from its output end, and in that on the section of the drive shaft having the tool holder, a clamping sleeve is received as a tool clamping device by means of the at least one can be actuated in a locking recess accommodated in the radial recess that breaks through the casing of the tool holder into a locking position protruding radially into the tool holder and can be released into an unlocking position for radial deflection.
• the lathe according to the invention is suitable and intended for clamping tools with a polygonal longitudinal recess which is adapted to the polygonal longitudinal recess forming the tool holder, in particular in the form of a hexagonal shaft, with a circumferential locking groove into which at least one locking element which can be actuated by means of the clamping sleeve in its locking position engages when the tool is clamped ,
• the tool receptacle which extends as a polygonal longitudinal recess into the drive shaft or a receptacle protruding therefrom, is limited in depth by a tapering centering cone for supporting and centering a tool shaft end which has an adapted counter-cone.
• the arrangement of a centering cone in the depth of the tool holder conveys, in addition to the necessary axial support of a tool, its precise centering at the end of the shaft, which expediently interacts with a centering of the shaft axially spaced from the centering cone.
• An axially spaced from the centering cone shaft centering of a tool can be realized in a simple manner in that three locking balls serve as clamping elements which can be actuated by means of the clamping sleeve between a locking position and an unlocking position and which break through and uniformly break through the jacket of the receiving pin of the tool holder in the vicinity of its free end face Radial recesses distributed over the circumference are accommodated.
• Characteristic of a tool holder and tool clamping device designed in this way is a precise centering of the shank end and spaced therefrom of the shank extending towards the actual tool, in that three locking balls arranged uniformly distributed over the circumference engage in a circumferential groove of the tool shank in the locking position.
• the clamping sleeve is expediently provided with locking devices for actuating and for locking the locking balls into their locking positions, and the locking devices should be designed as spherical caps which are adapted to the locking balls.
• the locking projections of the clamping sleeve can also be arranged on spring fingers which project axially from the clamping sleeve. The radial mobility of the spring fingers can be limited by the latter enclosing and possibly supporting stop means on the outside.
• the clamping sleeve is designed as a sliding sleeve which can be actuated axially between the locking position and the unlocking position.
• This sliding sleeve can be mounted directly on the receiving pin, into which the polygonal longitudinal recess extends as a tool holder, and can be part of an actuating sleeve which is axially displaceably guided on the receiving pin of the tool holder.
• the sliding sleeve can, however, also be axially fixed to an actuating sleeve which is guided in a rotationally fixed but axially movable manner on the machine housing, but can be rotatably connected with respect to the latter.
• the actuating shaft of the tool clamping device can be received on a housing connecting piece which projects from the machine housing and surrounds the receiving pin of the tool holder on part of its length.
• the lathe according to the invention can, however, also be designed such that the actuating sleeve, which is axially displaceably accommodated on the housing connection piece, can be position can be determined axially. This prevents accidental displacement of the actuating sleeve, and thus the clamping sleeve, from the locking position.
• the axial locking of the locking sleeve and thus the clamping sleeve in the locking position is realized in a preferred embodiment in that the actuating sleeve which is axially fixedly connected to the clamping sleeve is provided with at least one guide projection projecting beyond the contact surface with the housing connector and that this guide projection fits into one
• a guide groove extends into the housing connector and is adjoined by a locking section running in the circumferential direction, which in the locked position permits a limited rotation of the actuating sleeve relative to the housing connector receiving the latter, the guide projection reaching the locking section and thereby imparting an axial fixation of the actuating sleeve.
• the guide projection of the actuating sleeve can usefully be at least one spring-loaded guide ball which is received in a radial recess of the actuating sleeve.
• the axial displaceability of the sliding sleeve is limited by at least one resilient locking cam which engages in a detent in a locking position and in the unlocking position, with the result that the sliding sleeve is clearly positioned in its two functional end positions.
• the catches which engage in the respective end positions of the sliding sleeve of the locking cams can be axially spaced from one another in the spigot and into a surrounding the latter and the actuating sleeve rotatably stored housing socket radially pierced Rastnu ⁇ th act.
• the sliding sleeve can also be actuated by means of an electromagnet which engages on the actuating sleeve which is axially fixed but rotatably connected to the sliding sleeve.
• This electromagnet can be double-acting, which thus enables actuation of the sliding sleeve serving as a tensioning sleeve from the unlocking position into the locking position and vice versa from the latter back into the unlocking position.
• the actuation of the sliding sleeve by means of an electromagnet can also take place against the action of a return spring.
• a particularly important embodiment of the invention is characterized in that the receiving pin of the tool holder with the tool clamping device is overlapped by a housing cover connected to the machine housing and any access by an operator to the sliding or actuating sleeve is therefore impossible.
• the lathe according to the invention can be, for example, a cordless screwdriver, a hand drill, an impact drill or even a hammer drill.
• the design as a hammer drill is characterized in that the depth of the tool holder, that is to say the polygonal longitudinal recess, is limited by a plunger which is axially movable in the drive shaft and is designed like a sleeve and on which the tool holder me pointing side has a narrowing centering cone and is operatively connected to a pulsating axial drive.
• the centering cone mediates precise centering of the shank end of a tool received in the tool holder and the pulsating axial drive can in particular be a pneumatic drive of the type known from rotary hammers.
• the tools to be used When training as a hammer drill, the tools to be used must have a circumferential locking groove, the width of which is greater than the axial extent of the locking element engaging in the locking groove in the event of a lock, so that such a tool, within the scope of the width extension of the locking groove, has pulsating axial movements within the tool receptacle that act on a such pulsation is not involved.
• FIG. 1 is a side view of a cordless screwdriver with a tool holder arranged at the output end of a drive shaft that is operatively connected to a drive motor and a clamping sleeve of a tool clamping device received on the latter.
• Fig. 2 is a longitudinal section corresponding to the section line II-II in Fig. 1 through the output side Area of the cordless screwdriver with the tool holder and the tool clamping device,
• FIG. 3 shows a cross section along the section line III-III in FIG. 2 through the tool holder and the tool clamping device
• FIG. 4 is a view like in FIG. 2 a cordless screwdriver with a modified tool clamping device
• FIGS. 2 and 4 shows a longitudinal section through the output-side region of a cordless screwdriver, in which the tool clamping device has an actuating sleeve that is not designed to rotate;
• FIG. 7 shows a cross section along the section line VII-VII in FIG. 6 through the tool holder and the sliding sleeve of the tool clamping device
• FIG. 8 shows an alternative embodiment to FIG. 6, in which the actuating sleeve can be locked in the locking position
• FIG. 9 analogously to FIG. 7, a cross section corresponding to the section line IX-IX in FIG. tool holder and tool clamping device of the embodiment according to FIG. 8,
• FIG. 10 shows a guide link for the actuating sleeve which can be locked in the locking position with a view according to arrow X in FIG. 9 onto a projecting housing section
• FIG. 11 shows a view like in FIG. 1, an alternative cordless screwdriver design, in which the tool holder and the tool clamping device are accommodated within a housing cover, and
• FIG. 12 shows a longitudinal section corresponding to the section line XII-XII in FIG. 11 through the output-side area of the cordless screwdriver with the tool holder and the tool clamping device.
• the cordless screwdriver 10 illustrated in FIGS. 1 to 3 has a housing 11, from which a handle 12 with a coupling shoe 13 for a detachably coupled battery 14 protrudes approximately at right angles to its longitudinal extent.
• a drive motor which can be switched on and off by means of an actuation switch 15 and can be switched in the direction of rotation by means of a switch 16.
• the drive motor of a drive shaft 18 is operatively connected to the drive motor via a gear and a slipping clutch which can be adjusted with respect to the torque to be transmitted by means of an adjusting wheel 17 assigned to the housing 11 on the output side.
• the drive motor, the gearbox and the slip clutch are not shown in the drawing and also need no explanation, because such drive elements in cordless screwdrivers are generally known.
• the drive shaft 18, which is designed as a hollow shaft, is led out of the housing 11 with the adjusting ring 17 and can be rotated in the housing 11 in a manner of no further interest, but is axially fixed. It protrudes with a receiving pin 20 at the end of the housing 11 with the adjusting ring 17.
• a hexagonal longitudinal recess 21 extends from the free front end of the receiving pin 20 as a tool holder for tools equipped with adapted hexagonal shanks.
• the hexagonal longitudinal recess 21 ends in depth in a centering cone 22.
• a clamping sleeve designed as a sliding sleeve 25 is axially displaceably received on the above receiving pin 20.
• the sliding sleeve 25 can be actuated between a locking position and an unlocking position.
• the locking position which is shown in FIGS. 2 and 3
• the locking balls 24 project radially into the hexagon recess 21 and are held in this position by locking members 26 of the sliding sleeve 25.
• the locking balls 24 in the sliding sleeve radially adjoin the locking projections 26 radially adjoining radial recesses 27 such that they no longer protrude into the tool receptacle formed by the hexagonal longitudinal recess 21.
• the latching projections 26 of the sliding sleeve 25 are adapted to the latching balls 24 and are designed as hollow spherical caps such that the latching balls are supported flatly on the latching boards when a tool is clamped.
• the sliding sleeve 25 is positioned in the advanced unlocking position and in the retracted locking position axially spaced therefrom by means of at least one resiliently attached locking cam 28 which, in the respective end position, engages in a locking groove 29, 30 which is radially recessed into the receiving pin 20 from the outside.
• the cordless screwdriver 10 is intended for clamping tools with a hexagonal shank and a centering cone arranged at the end of the shank, as well as an annular groove extending at a distance from the centering cone.
• the distance between the circular groove in the tool shank and the end-centering cone corresponds to the distance between the centering cone 22 at the end of the hexagonal longitudinal recess 21 that forms the tool holder and the locking balls 26, in which the radial recesses 23 arranged near the free end of the holder pin are received.
• the shank of such a tool can be inserted into the tool holder 21 when the sliding sleeve 25 is in the advanced unlocking position, in which the locking balls can move radially out of the area of the hexagonal longitudinal recess 21 forming the tool holder.
• the tool can be clamped in the tool holder by pulling back the sliding sleeve into the locking position shown in FIGS. 2 and 3 by the locking balls 24 engaging in the circumferential locking groove of the tool shaft.
• FIGS. 4 and 5 differs from the cordless screwdriver shown in FIGS. 2 and 3 in that the locking projections 26 are arranged on three spring fingers 38 extending axially from the sliding sleeve 25 x , which in the locking position shown in FIG Interest in a desirable tolerance compensation can avoid limited radial.
• the spring travel of the spring fingers 38 is limited by a radially encompassing stop shoulder 39.
• 6 and 7 illustrate in views similar to FIGS. 2 and 3 an alternative embodiment of the tool holder and tool clamping device. 6 and 7 are used for the same parts as in FIGS. 1 to 3 in each case increased by 100 reference numerals.
• the alternative embodiment according to FIGS. 6 and 7 also has a housing 111 with the collar 117 protruding mounting pin 120 with a hexagonal longitudinal recess 121 as a tool holder.
• the jacket is in turn broken through by radial recesses 123 which are distributed uniformly over the circumference and in which locking balls 124 are accommodated as locking elements in a radially movable manner.
• an axially displaceable clamping sleeve 125 is also accommodated, which has front locking devices 126 for locking the locking balls 124 in a locking position protruding into the hexagonal longitudinal recess 121 and is provided with radial recesses 127 axially adjacent to the locking devices into which the locking balls 124 can radially deflect when the clamping sleeve 125 is pushed into the unlocking position.
• the clamping sleeve 125 which is received in a rotationally fixed manner on the receiving pin 120 and also designed as a sliding sleeve, is not formed in one piece with an operating sleeve, but is axially fixed but rotatably connected to an operating sleeve 125, which in turn rotatably rests on one of the receiving pins 120 a part of its longitudinal extent concentrically enclosing housing socket 132 is mounted axially displaceable.
• the rotatable connection of the control sleeve 125 ⁇ with the clamping sleeve 125 can be carried out via a slide bearing, for example by means of a radial projection of the clamping sleeve engaging in a corresponding radial groove of the control sleeve, as shown in the upper half of FIG. 6, or by means of a ball bearing, such as that shows the lower half of the sectional view in FIG. 6.
• the control sleeve 125 ⁇ is in turn by means of a resilient locking cam protruding therefrom 128 can be positioned in its two end positions, namely the clamping position illustrated in FIG.
• the actuating sleeve 125 which is accommodated in an axially movable but non-rotatable manner on the housing stub 132, has a cam 133 projecting into a longitudinal recess breaking through the housing stub 132 and actuating an electrical contact 134, 135 arranged at the ends of the long recess in the end positions of the sliding sleeve. These contacts enable the lathe to be switched on only if a tool is properly clamped in the tool holder.
• the gap between the clamping sleeve 125 and the rotatable but axially fixed operating sleeve 125 ⁇ in the vicinity of the end face remote from the machine housing is protected against the ingress of dirt by means of an O-ring 136.
• the tool holder 121 is equipped in depth with a tapering centering cone 122, which, however, in contrast to the first embodiment, is part of an axially movably arranged in the depth of the tool holder Ram 134 is.
• This plunger is with a pulsating axial drive, such as one Drilling hammers known pneumatic drive, in operative connection.
• FIGS. 6 and 7 The alternative embodiment according to FIGS. 6 and 7 is intended for the use of tools in which, like in conventional rotary hammers, the circumferential annular groove spaced apart from a centering cone arranged at the shaft end has a width extension which is greater than the axial depth of engagement of the locking balls 124 in the locked position.
• FIGS. 6 and 7 is therefore a cordless screwdriver which can also be used as a rotary hammer and with a plunger 134 driven pulsatingly by means of a pneumatic drive or in another way within the scope of the width extension of the annular groove arranged in the shank of a corresponding tool allows an axial movement of a clamped tool superimposed on a rotary movement.
• FIGS. 8 to 10 differs from the embodiment explained above in connection with FIGS. 6 and 7 in that the actuating sleeve 125 ⁇ accommodated on the housing connection piece 132 does not have locking cams interacting with annular grooves of the housing connection piece, but rather the actuation sleeve 125 , ⁇ can be axially locked in the locking position shown in FIG. 8.
• the actuating sleeve 125 which is axially fixedly connected to the clamping sleeve 125, is equipped with three guide balls 140 arranged at equal angular distances around the circumference, which are received in transverse recesses 141 of the actuating sleeve and, under the application of spring force, also uniformly over the circumference of the Engage the housing socket 132 ⁇ distributed guide grooves 142.
• These guide grooves extend axially over a length section corresponding to the axial movement of the actuating sleeve 125 ⁇ from the retracted unlocking position into the advanced locking position and then bend at right angles in the circumferential direction to form locking sections 143.
• the actuating sleeve 125 , ⁇ can be axially locked in the locking position by rotation with respect to the housing connector 132, because as a result of this rotation the guide balls 140 enter the locking sections 143.
• a clamping sleeve 225 is axially movably mounted and axially fixed but rotatably connected to an actuating sleeve 225 ⁇ , which in turn on one of the Receptacle 220 on a part of its length and projecting from the housing 211 protruding housing socket 232 is rotatably but axially displaceably mounted.
• the actuation of the clamping sleeve 225 between its locking position, in which the locking balls 224 into the hexagonal longitudinal recess 221, which forms the tool holder closed off in depth by a clamping cone 222, and an advanced unlocking position, in which the locking balls 224 can dodge radially, is used double-acting magnet 235, which is attached to one of the protruding from the housing 211 with the adjusting ring and the receiving pin 220 on a part of its length concentrically enclosing housing socket 232 engages actuating ring 225.
• This magnet can be double-acting or actuate the clamping sleeve 225 against the action of a return spring in one of its end positions.
• the tool holder with the tool clamping device accommodated on the receiving pin or a housing projection is received within a housing cover 236, which extends from the machine housing 211 with the adjusting ring axially extended and encloses the tool holder and the tool clamping device.

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• 2001
  • 2001-07-26 DE DE20112117U patent/DE20112117U1/de not_active Expired - Lifetime
• 2002
  • 2002-07-18 WO PCT/DE2002/002632 patent/WO2003015991A1/fr not_active Application Discontinuation
  • 2002-07-18 EP EP02758103A patent/EP1414621B1/fr not_active Expired - Lifetime
  • 2002-07-18 DE DE50214075T patent/DE50214075D1/de not_active Expired - Lifetime
  • 2002-07-18 DE DE10293601A patent/DE10293601A5/de not_active Withdrawn
  • 2002-07-18 US US10/381,445 patent/US6988734B2/en not_active Expired - Fee Related
  • 2002-07-18 AT AT02758103T patent/ATE451200T1/de active

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