EP2080591A2 - Clamp device for tensioning workpieces - Google Patents

Clamp device for tensioning workpieces Download PDF

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Publication number
EP2080591A2
EP2080591A2 EP09000074A EP09000074A EP2080591A2 EP 2080591 A2 EP2080591 A2 EP 2080591A2 EP 09000074 A EP09000074 A EP 09000074A EP 09000074 A EP09000074 A EP 09000074A EP 2080591 A2 EP2080591 A2 EP 2080591A2
Authority
EP
European Patent Office
Prior art keywords
jaws
clamping
pendulum
hand thread
synchronous spindle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09000074A
Other languages
German (de)
French (fr)
Other versions
EP2080591A3 (en
Inventor
Volker Jochum
Original Assignee
Volker Jochum
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE200810005280 priority Critical patent/DE102008005280B3/en
Application filed by Volker Jochum filed Critical Volker Jochum
Publication of EP2080591A2 publication Critical patent/EP2080591A2/en
Publication of EP2080591A3 publication Critical patent/EP2080591A3/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00Vices
    • B25B1/06Arrangements for positively actuating jaws
    • B25B1/10Arrangements for positively actuating jaws using screws
    • B25B1/103Arrangements for positively actuating jaws using screws with one screw perpendicular to the jaw faces, e.g. a differential or telescopic screw
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00Vices
    • B25B1/24Details, e.g. jaws of special shape, slideways
    • B25B1/2405Construction of the jaws
    • B25B1/241Construction of the jaws characterised by surface features or material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00Vices
    • B25B1/24Details, e.g. jaws of special shape, slideways
    • B25B1/2405Construction of the jaws
    • B25B1/241Construction of the jaws characterised by surface features or material
    • B25B1/2415Construction of the jaws characterised by surface features or material being composed of a plurality of parts adapting to the shape of the workpiece
    • B25B1/2426Construction of the jaws characterised by surface features or material being composed of a plurality of parts adapting to the shape of the workpiece the parts having a pivotal movement
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00Vices
    • B25B1/24Details, e.g. jaws of special shape, slideways
    • B25B1/2405Construction of the jaws
    • B25B1/2473Construction of the jaws with pull-down action on the workpiece
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00Vices
    • B25B1/24Details, e.g. jaws of special shape, slideways
    • B25B1/2489Slideways

Abstract

The clamping device comprises a support body (1) with a plane surface (2) to mount a work piece. Two clamping jaws (4) are guided to each other in a moving manner in the support body. Pendulum jaws (6) are stored in jaw bodies (5) of the clamping jaws in a pivoting manner in cylindrical recesses. The recesses are diagonally tilted outwards from above. The pendulum jaws are based at an inner side of the recesses by a spring such that the pendulum jaws are pulled down while pressing at the workpiece against a spring force.

Description

  • The invention relates to a clamping device for clamping workpieces, in particular of machined blanks. The clamping device consists essentially of a carrier with a plane surface for clamping the workpieces and at least two in the carrier to each other slidably guided jaws.
  • Such clamping devices are used for example for machining blanks made of copper or graphite by machining such as milling, grinding, drilling or the like. The blanks are for this purpose sawed from plates so that the desired shape can be worked out without much waste of material.
  • In order to minimize the preparatory work for clamping the blanks, the clamping jaws should be designed so that blanks with non-parallel side walls can be firmly clamped. Therefore, the invention of clamping devices with such jaws, in whose cheeks so-called pendulum jaws are pivotally mounted in cylindrical recesses. These pendulum jaws adapt well to the side walls of the blanks, so that the clamping force is optimally introduced into the workpiece.
  • In order to achieve a repeatable clamping in the workpiece with only one plane, it is also important that the workpiece is simultaneously pressed firmly on the flat surface of the carrier during clamping. Therefore, jaws are commonly used in practice with so-called Niederzugfunktion. In the case of these jaws, the jaw walls are obliquely cut in the upper area, so that during clamping the upper piece springs downwards and the workpiece is pulled downwards.
  • In other known embodiments of clamping jaws, the pull-down function is produced by inserting in a groove in the upper region of the jaw walls an obliquely downwardly directed spring leaf, which easily digs into the side wall of the workpiece during clamping with a sharp edge and firmly fixes the workpiece depresses the plane surface of the carrier. In these embodiments of the jaws, however, it is necessary for the desired Niederzugeffekt that the clamped side walls of the workpiece are absolutely parallel to each other, which can only be achieved by appropriate preparatory work.
  • In order to clamp well workpieces with non-parallel side walls without further preparation, it is an object of the invention, in the above-mentioned clamping device, the pendulum jaws in such a way that they are effective at the same time as Niederzugbacken. This is achieved according to the proposal of the invention, characterized in that the recesses inclined symmetrically from the top to the outside obliquely and the embedded therein jaws are supported on its underside by springs, so that the pendulum jaws are pulled down when pressed against the workpiece against the spring force ,
  • In order to keep the clamping height of the jaws also as low as possible, the jaws are designed according to a further feature of the invention, that the jaw body are guided below the plane surface with a threaded bush in a groove-shaped recess, and that the threaded bushes each with a right-hand thread and a Left threads are provided, wherein the threads are detected by two clamping jaws by a synchronous spindle, which are equally provided with a right-hand thread and a left-hand thread.
  • Further features of the invention and its advantages will become apparent from the dependent claims and the explanation of a preferred Ausführungsbehpiels of the invention, which is illustrated in the drawings and will be described in more detail below. Herein show:
  • FIG. 1
    a clamping device with four jaws in perspective view,
    FIG. 2
    The same clamping device in section along line II - II in FIG. 3 .
    FIG. 3
    The clamping device in a plan view,
    FIG. 4
    The carrier body of the clamping device in front view,
    FIG. 5
    The carrier body in section along line V - V in FIG. 4 .
    FIG. 6
    The cheek body in front view,
    FIG. 7
    The cheek piece in section according to line VII - VII in FIG. 6 .
    FIG. 8
    The synchronous spindle in longitudinal section,
    FIG. 9
    The pendulum jaw in front view,
    FIG. 10
    the pendulum jaw in side view,
    FIG. 11
    The jaw body with inserted pendulum jaw,
    FIG. 12
    The clamping device with a clamped workpiece in perspective view,
    FIG. 13
    The same clamping device in section according to line XIII - XIII in FIG. 14 and
    FIG. 14
    The same clamping device in plan view.
  • The clamping device shown in the figures consists essentially of a carrier body 1 with a plane surface 2 for clamping the zu machining workpieces 3 and at least two in the carrier body 1 to each other slidably guided jaws 4, in the jaw members 5 so-called pendulum jaws 6 are pivotally mounted in cylindrical recesses 7. These pendulum jaws 6 have the advantage that they adapt well even with blanks with non-parallel side walls 24, so that the clamping force is optimally introduced into the workpiece 3 (see FIGS. 12 to 14 ).
  • How out FIG. 2 seen, the axes of the pendulum jaws 6 are inclined from above symmetrically to each other obliquely outwards. In addition, the pendulum jaws 6 are supported on their underside by resilient elements 8 such as rubber rings, spring plate or coil springs, so that the pendulum jaws 6 are pulled down when pressed against the workpiece 3 against the spring force. In this way, the workpieces 3 can be reliably detected with a very low clamping height and kept safe even after the processing of the surface for subsequent erosion use.
  • The jaw members 5 are slidably guided below the plane surface 2 with a threaded bushing 9 in a guide channel 10 of the carrier body 1. The threaded bushes 9 are each provided with a right-hand thread 11 and a left-hand thread 11 '(see FIGS. 6 and 7 ), wherein the threads are detected by two jaws 4 by a synchronous spindle 13, which are equally provided with a right-hand thread 12 and a left-hand thread 12 '(see FIG. 8 ). To guide the jaws 4, three guide springs 14 are integrally formed on the inner wall of the guide trough 10 in the present embodiment.
  • On the outer wall of the threaded bushing 9, three guide grooves 15 are inserted at the corresponding points, which slide on the guide springs 14 after installation of the clamping jaws 4. The inner wall of the guide trough 10 is, as from the FIGS. 4 and 5 seen in its center by a transverse wall 16 which terminates at the top with the flat surface 2 and the support body 1 gives additional stability. This transverse wall 16 is also provided with a bore 17 corresponding to the outer diameter of Synchronous spindle 13 is provided, wherein the axis of the bore 17 relative to the axis of the guide groove 10 is slightly offset downwards.
  • The synchronous spindle 13 has in turn in the middle an annular groove 18 whose width "B" is slightly larger than the thickness "D" of the transverse wall 16. This annular groove 18 is used when installing the synchronous spindle 13 in the guide groove 10 for axial fixation in the bore 17, by the synchronous spindle 13 is raised during insertion into the bore 17 as soon as the annular groove 18 has reached the transverse wall 16. On an end face of the synchronous spindle 13, a hexagon socket 19 is formed (see also FIG. 8 ) to rotate the spindle 13 for moving the jaws 4 by means of an Allen wrench.
  • In the jaws 4 is drilled transversely to the axis of the cylindrical recess 7 in the lower region and tangentially to the cylinder wall depending on a small through hole 20. In this is how out FIG. 11 can be seen, a small locking pin 21 inserted laterally as soon as the pendulum jaw 6 is inserted with associated spring 8 in the recess 7. The pendulum jaw 6 has for this purpose at its lower end to a projection 22 which is located after the insertion of the pendulum jaws 6 below the locking pin 21 and this engages behind, so that the pendulum jaw 6 is held in the recess 7. For secure gripping of the side walls 24 of the workpiece 3, the pendulum jaw 6 also has at its projecting beyond the flat surface 2 end of a corrugated contact surface 23 which is aligned approximately perpendicular to the plane surface 2. This contact surface 23 is expediently slightly curved so that it can easily adapt to any unevenness of the side walls 23.
  • In the FIGS. 13 to 14 is clearly shown how a workpiece 3 can be clamped safely and plangenau with only raw sawn sidewalls 24 in the clamping device. Here, the side walls 24 as from the cutting area in FIG. 14 recognizable, to be formed within certain limits not parallel. In addition, the side walls 24, as shown FIG. 13 recognizable, slightly obliquely directed to the plane 2.
  • In both cases, it is ensured by the pivotal mounting of the pendulum jaws 6 and by their oblique orientation to the flat surface 2, that the workpiece 3 is always detected on its side walls 24 and firmly tightened when tightening the jaws 4 on the flat surface 2.
  • LIST OF REFERENCE NUMBERS
  • 1 support body 12 ' left-hand thread 2 plane surface 13 synchronous spindle 3 workpiece 14 guide springs 4 jaws 15 guide 5 Back body 16 partition 6 pendulum jaws 17 drilling 7 Cylindrical recess 18 ring groove 8th feathers 19 Allen 9 threaded bushing 20 Through Hole 10 guide trough 21 locking pin 11 right-hand thread 22 head Start 11 ' left-hand thread 23 pressing surface 12 right-hand thread 24 side walls

Claims (4)

  1. Clamping device for clamping workpieces, consisting of a carrier body (1) with a plane surface (2) for clamping the workpieces and at least two in the carrier body (1) mutually displaceably guided jaws (4) in whose jaw bodies (5) so-called pendulum jaws (6 ) are pivotally mounted in cylindrical recesses (7), characterized in that the recesses (7) inclined symmetrically from above obliquely outwards and the embedded therein jaws (6) are supported on their underside by springs (8), so that the pendulum jaws (6) are pulled down against the spring force when pressed against the workpiece.
  2. Clamping device according to claim 1, characterized in that the jaw members (5) below the plane surface (2) with a threaded bushing (9) in a guide groove (10) are displaceably guided, and that the threaded bushes (9) each having a right-hand thread (11). and a left-hand thread (11 ') are provided, these threads (11 and 11') being detected by two clamping jaws (4) each by a synchronous spindle (13), which likewise has a right-hand thread (12) and a left-hand thread (12 '). are provided.
  3. Clamping device according to claim 2, characterized in that the inner wall of the guide groove (10) is connected at its center by a transverse wall (16) which is provided with a bore (17) corresponding to the outer diameter of the synchronous spindle (13), and that the synchronous spindle (13) in turn in the middle an annular groove (18) which is incorporated during installation of the synchronous spindle (13) for axial fixation in the bore (17).
  4. Clamping device according to claim 2 or 3, characterized in that in the clamping jaws (4) transversely to the axis of the cylindrical recesses (7) and tangentially to the cylinder wall each have a small through hole (20) is drilled into which a locking pin (21) is inserted, when the pendulum jaws (6) are inserted with their associated springs (8) in the recess (7), wherein the pendulum jaws (6) at their lower ends a projection (22) which engage the locking pin (21) behind.
EP09000074A 2008-01-19 2009-01-07 Clamp device for tensioning workpieces Withdrawn EP2080591A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200810005280 DE102008005280B3 (en) 2008-01-19 2008-01-19 Clamping device for clamping workpieces

Publications (2)

Publication Number Publication Date
EP2080591A2 true EP2080591A2 (en) 2009-07-22
EP2080591A3 EP2080591A3 (en) 2012-10-31

Family

ID=40627417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09000074A Withdrawn EP2080591A3 (en) 2008-01-19 2009-01-07 Clamp device for tensioning workpieces

Country Status (2)

Country Link
EP (1) EP2080591A3 (en)
DE (1) DE102008005280B3 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512794A (en) * 1968-02-23 1970-05-19 Logansport Machine Co Inc Pull-back chuck false jaws for machine chucks
EP0053433A2 (en) * 1980-11-29 1982-06-09 Bernard Smith 4-Jaw work holding lathe chuck
DE202005012033U1 (en) * 2005-02-18 2006-05-04 Allmatic-Jakob Gmbh & Co. Spannsysteme Kg Clamping jaw and clamping device with such a jaw

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4014565C2 (en) * 1990-05-07 1992-02-27 Gottfried 8851 Ellgau De Stampfer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512794A (en) * 1968-02-23 1970-05-19 Logansport Machine Co Inc Pull-back chuck false jaws for machine chucks
EP0053433A2 (en) * 1980-11-29 1982-06-09 Bernard Smith 4-Jaw work holding lathe chuck
DE202005012033U1 (en) * 2005-02-18 2006-05-04 Allmatic-Jakob Gmbh & Co. Spannsysteme Kg Clamping jaw and clamping device with such a jaw

Also Published As

Publication number Publication date
EP2080591A3 (en) 2012-10-31
DE102008005280B3 (en) 2009-06-25

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