EP0463344B1 - Spannvorrichtung mit Kraftverstärker, insbesondere Maschinenschraubstock - Google Patents

Spannvorrichtung mit Kraftverstärker, insbesondere Maschinenschraubstock Download PDF

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Publication number
EP0463344B1
EP0463344B1 EP91107821A EP91107821A EP0463344B1 EP 0463344 B1 EP0463344 B1 EP 0463344B1 EP 91107821 A EP91107821 A EP 91107821A EP 91107821 A EP91107821 A EP 91107821A EP 0463344 B1 EP0463344 B1 EP 0463344B1
Authority
EP
European Patent Office
Prior art keywords
clamp
sleeve
clamping
chucking device
disposed
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.)
Expired - Lifetime
Application number
EP91107821A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0463344A2 (de
EP0463344A3 (en
Inventor
Heinrich Dipl.-Ing. Berchthold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gressel AG
Original Assignee
Gressel AG
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
Application filed by Gressel AG filed Critical Gressel AG
Publication of EP0463344A2 publication Critical patent/EP0463344A2/de
Publication of EP0463344A3 publication Critical patent/EP0463344A3/de
Application granted granted Critical
Publication of EP0463344B1 publication Critical patent/EP0463344B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B25B1/00—Vices
    • B25B1/06—Arrangements for positively actuating jaws
    • B25B1/10—Arrangements for positively actuating jaws using screws
    • B25B1/103—Arrangements for positively actuating jaws using screws with one screw perpendicular to the jaw faces, e.g. a differential or telescopic screw
    • 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
    • B25B1/00—Vices
    • B25B1/06—Arrangements for positively actuating jaws
    • B25B1/10—Arrangements for positively actuating jaws using screws
    • B25B1/106—Arrangements for positively actuating jaws using screws with mechanical or hydraulic power amplifiers
    • 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
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways

Definitions

  • the invention relates to a clamping device with a power amplifier, in particular a machine vice, with a clamping device body, a fixed jaw arranged thereon and a jaw movable relative to it, for the adjustment of which a rod which can be acted upon by the power amplifier is provided, with a rotatable clamping sleeve surrounding the power amplifier, which has an external thread and engages with it in a nut thread of a stationary housing surrounding it and whose rotational movement with respect to the housing is limited by stop surfaces, with a first clamping ring arranged in a rotationally fixed manner in the clamping sleeve, with a second clamping ring arranged in a rotatably limited manner in the clamping sleeve, which by means of An actuating lever for the power amplifier is rotatable, with several clamping bolts arranged between the clamping rings, which in an end position (open position) of the second clamping ring inclined at an acute angle to the clamping sleeve axis u
  • the stationary housing surrounding the clamping sleeve is arranged axially outside of a stationary part of the clamping device.
  • the adapter sleeve and about half of the power amplifier protrude axially from the housing. That close in the axial direction, the disc springs and the adjusting sleeve, which in turn can be screwed onto the clamping sleeve.
  • the handle of the screw spindle then also protrudes from the adapter sleeve.
  • the total length of the device in relation to its maximum span is quite large due to the axial arrangement of the above-mentioned components following a stationary part of the device body.
  • the movable jaw is pressed against the workpiece by a push rod that is adjustable in the hollow screw spindle.
  • the clamping forces generated in this way result in forces on the fixed jaw and the stationary part of the device body which are directed outwards in opposition to one another and which can lead to a deflection of the device body in its central part upwards.
  • the latter has the result that the jaws no longer run exactly parallel to one another, but have a greater distance in the upper area than in the lower area. As a result, the workpiece is clamped only in the lower region of the jaws.
  • the known clamping device described above has the advantage that thanks to the screwable clamping sleeve and the power amplifier arranged in it, an opening and clamping stroke with a relatively small total angle of rotation of the actuating lever of less than 180 ° the movable jaw of about 2 - 4 mm and so-called quick clamping with power amplification is possible.
  • the invention has for its object to provide a clamping device with a power amplifier, in particular a machine vise of the type mentioned, while maintaining the quick clamping, in which the ratio of the maximum span to the overall length is optimally large, as well as deformations of the device body by the clamping forces should be avoided if possible.
  • the stationary housing is arranged in the device body under the fixed jaw or is formed in the area located under the fixed jaw in that the second clamping ring with one end extending through the first clamping ring and the movable Cheek-extending and designed as a pull rod is firmly connected, with the other, led out of the movable jaw, the adjusting sleeve connected and the actuating lever is connectable, and that the disc springs are supported with the interposition of the axial bearing on the side of the movable jaw facing away from the fixed jaw .
  • the arrangement of the stationary housing, the clamping sleeve and the power amplifier in the area under the fixed jaw results in a particularly short design of the clamping device, because all components essential for generating high-pressure clamping are in other components that determine the overall length of the clamping device integrated into it.
  • the ratio of the maximum span to the overall length is thus optimally large.
  • the sensitive parts of the clamping device such as the clamping sleeve and the power amplifier itself, are protected in the area under the fixed jaw.
  • the disc springs, the axial bearing and the adjusting sleeve can, if appropriate, be arranged in a protected manner within a hollow handle of a screw spindle. This largely eliminates the risk of damage.
  • the pull rod has a dual function in the new tensioning device.
  • the vice body 1 in the embodiment shown consists of a head part 1a which is screwed to a guide part 1b.
  • the head part and the guide part can also consist of one piece.
  • the head part 1a carries a fixed part in its upper area Clamping jaw 2, which can also be detached from the head part in a known manner.
  • the movable jaw 3 is slidably mounted on longitudinal guides, not shown.
  • the movable jaw can be detachable from a slide carrying it, but this is not shown in the drawing for the sake of simplicity.
  • a housing 5 is arranged in a corresponding recess 4 under the fixed jaw 2 in a rotationally fixed and axially immovable manner, ie rigidly connected to the head part 1a.
  • the housing 5 could optionally also be made in one piece with the head part 1a.
  • an adapter sleeve 6 is rotatably supported to a limited extent.
  • the clamping sleeve 6 has an external thread 7, which engages in a corresponding nut thread 8 of the housing 5.
  • the two threads 7, 8 are expediently designed as coarse threads (steep threads).
  • the required thread 7 is a trapezoidal thread Tr 50 x 10 (mm), ie it has a pitch or pitch of 10 mm with a nominal diameter of 50 mm. Since the pitch of the external thread 7 is essential for the infeed or opening stroke that can be achieved with a predetermined angle of rotation of an actuating lever described below, and since the external thread 7 must always have self-locking, the pitch cannot be increased arbitrarily. For this reason, it is advantageous if the external thread has a nominal diameter of at least 44 mm with a pitch of 8 mm.
  • a first clamping ring 9 is arranged within the clamping sleeve 6 and is firmly connected to the clamping sleeve.
  • the first clamping ring 9 and the clamping sleeve 6 can also consist of one part, as shown.
  • the clamping ring 9 forms a first part of a power amplifier enclosed by the clamping sleeve 6.
  • a second clamping ring 10 can be rotated to a limited extent and axially in the clamping sleeve 6 at a distance from the first clamping ring 9 slidably arranged. Between the two clamping rings 9, 10 a total of three clamping bolts 11 are provided, each offset by 120 ° in the circumferential direction.
  • the clamping bolts 11 assume an acute angle ⁇ of, for example, 10 ° with respect to the axis A of the clamping sleeve 6, as is indicated in FIG. 1 by dash-dotted lines.
  • One end 13a of a pull rod 13 is fixedly connected to the clamping ring 10 via a transverse bolt 12, which extends through the other clamping ring 9 and a hollow screw spindle 14 and is led out of the screw spindle 14 with its other end 13b.
  • the operating lever 15 shown in dash-dotted lines can be attached, with which the pull rod and thus also the second clamping ring 10 can be rotated.
  • a stop pin 16 is arranged in a semi-cylindrical recess of the second clamping ring 10.
  • the clamping sleeve 6 has a first recess 17, the end surfaces 17a and 17b of which form stop surfaces for the stop bolt 16.
  • the stop bolt 16 bears against the stop surface 17b.
  • the other end position of the second clamping ring 10 is determined by the stop surface 17a, against which the stop bolt 16 rests in the clamping position of the machine vice.
  • the stop surface 17a is arranged that the clamping bolts 11 are always slightly moved in the clamping position of the clamping ring 10 over their parallel position to the clamping sleeve axis A, ie beyond their dead center position, whereby a secure locking of the power amplifier is achieved.
  • a bushing 18 On the end 13b of the pull rod 13 protruding from the screw spindle, a bushing 18 is arranged, which is connected to the end 13b in a tensile and rotationally fixed manner by means of a cross pin 19.
  • the cross pin 19 penetrates the sleeve 18 and the tie rod end 13b and is held by means of a spring-loaded detent ball 20. In this way, the bush can be easily released by pulling out the cross pin 19 from the pull rod 13 if necessary.
  • the actuating lever 15 also acts on the transverse pin 19.
  • an adjusting sleeve 21 On the sleeve 18, an adjusting sleeve 21 is axially adjustable by means of a fine thread 22. With this adjusting sleeve 21, the biasing force of several plate springs 23 can be adjusted.
  • the plate springs 23 act in the tensioned position via an axial bearing 24 on the bottom 25a of a hollow handle 25.
  • the bottom 25a is connected to the end 14a of the screw spindle 14 opposite the fixed clamping jaw 2.
  • the hollow handle encloses the axial bearing 24, the plate springs 23 and part of the adjusting sleeve 21.
  • the spindle 14 can be rotated by means of the handle 25 and thus the movable jaw 3 can be adjusted relative to the fixed jaw 2.
  • the adjusting sleeve 21 By turning the adjusting sleeve 21 relative to the bush 18, the force of the plate spring assembly 23 and thus the clamping force that can be achieved with the machine vice can be adjusted.
  • the diameter of the shoulder 27 is larger than the part 18a which supports the plate springs.
  • a flange 28 is provided which is axially displaceable in a recess in the bottom 25a. The axial distance between the annular shoulder 26 and the flange 28 is equal to or slightly larger than the axial width of the axial bearing 24.
  • a compression spring 30 is arranged which concentrically surrounds the pull rod 13. This compression spring 30 presses the hollow spindle 14 to the right in the open position of the machine vice and also ensures that the clamping bolts 11 remain in their oblique position relative to the clamping sleeve axis A during the feed stroke.
  • the rotational movement of the clamping sleeve 6 relative to the housing 2 in the opening direction is by a second stop pin 31 and a stop surface interacting with it 32a, which is an end face of a recess 32 provided in the clamping sleeve 6.
  • the stop pin 31 is fixed in a semi-cylindrical recess in the housing 5.
  • the housing 5 is sealed by means of a cover 33 and filled with oil or fat, so that parts of the tensioning device and the power amplifier contained therein are insensitive and durable even under extreme operating conditions.
  • the mode of action is as follows:
  • the hollow spindle 14 is rotated by means of the handle 25.
  • the movable jaw is displaced by its thread engaging in the spindle nut 3a of the movable jaw 3.
  • the span of the machine vice can thus be infinitely adjusted.
  • the span is set approx. 2 mm larger than the dimension of the workpiece to be clamped so that it can be inserted into the machine vice unhindered.
  • Clamping and unclamping (quick clamping) of the workpiece is then carried out by means of the separate actuating lever 15.
  • the clamping sleeve according to FIG. 3 is turned so far to the right that the stop surface 32a lies against the stop bolt 31.
  • the second clamping ring 10 is rotated so far to the right that the stop pin 16 bears against the stop surface 17b.
  • the actuating lever then assumes the position shown in broken lines in FIG. 3.
  • the clamping bolts 11 initially remain in their oblique position with respect to the clamping sleeve axis A.
  • the first clamping ring 9 is thus also carried in the same direction of rotation. Since this is non-rotatably connected to the clamping sleeve 6, the clamping sleeve 6 is first rotated in the same direction of rotation. Due to the interaction of the external thread 7 with the nut thread 8, the clamping sleeve 6 moves to the left according to FIG. 1.
  • the second clamping ring 10 is shifted to the left and takes over the tie rod 13, the sleeve 18, the plate springs 23, the thrust bearing 24 and the bottom 25a with the screw 14, which in turn the movable jaw 3 moved in contact with the workpiece.
  • the path that the movable jaw 3 travels from its open position to its contact with the workpiece is referred to as the feed stroke. If this feed stroke is 2 mm, for example, the actuating lever 15 must be pivoted by an angle ⁇ of 72 ° according to FIG. 3.
  • the rotation of the second clamping ring 10 is continued until the axes a of the clamping bolts 11 are opposite by about 3 ° beyond their dead center position running parallel to the clamping sleeve axis A. are inclined to their starting position with respect to the clamping sleeve axis A. In this clamping position, the stop pin 16 then lies against the stop surface 17a of the clamping sleeve 6. This ensures a stable clamping position.
  • the second clamping ring 10 is shifted a little more to the left and thus also moves the pull rod 13 to the left by the same amount.
  • the plate springs 23 press with their preset clamping force via the axial bearing 24 onto the base 25a and thus onto the screw spindle 14. This presses the movable jaw 3 with the preset clamping force onto the workpiece. If the workpiece is machined, the resilience is retained thanks to the elasticity of the plate springs 23, although it drops somewhat.
  • the relaxation takes place in the reverse order in that the actuating lever 15 is pivoted to the right in the opposite direction of rotation according to FIG.
  • the second clamping ring 10 also rotates to the right until the stop pin 16 comes into contact with the stop surface 17b, which ensures that the clamping pins 11 are not tilted beyond the intended inclined position of 10 ° relative to the clamping sleeve axis A.
  • the compression spring 30 holds the second clamping ring 10 in constant contact with the clamping bolt 11 and also causes the screw spindle 14 to be moved to the right in the open position.
  • the clamping sleeve 6 is rotated clockwise according to FIG. 3 until its stop surface 32a comes into contact with the stop pin 31.
  • the actuating lever 15 thus again assumes its position shown in broken lines in FIG. 3.
  • the rotation of the clamping sleeve 6 relative to the housing 5 moves the 1 to the right and the screw 14 can follow under the action of the compression spring 30.
  • the movable jaw 3 is hereby completely moved into its open position.
  • the bushing 18 can be released from the pull rod 13 by pulling out the transverse pin 19, without the pre-tensioning of the disc springs 12 set by means of the adjusting sleeve 21 being influenced.
  • the screw spindle 14 together with the movable jaw 3 can be easily removed from the guide part 1b for cleaning and other purposes, for example also for clamping the vice.
  • the embodiment shown in Figure 2 differs only in the connection of the adjusting sleeve 21 to the tie rod 13.
  • the same reference numerals as in Figure 1 are used in Figure 2 for parts of the same function, so that a repeated description of these parts is unnecessary.
  • the adjusting sleeve 21, the plate springs 23 and the thrust bearing 24 are arranged directly on the end 13b of the pull rod 13.
  • the adjusting sleeve 21 is adjustable by means of a fine thread 22 relative to the pull rod 13.
  • the pull rod has, adjacent to its part 35 carrying the plate springs 23, an annular shoulder 36 on which the plate springs are supported as long as the power amplifier is not yet brought from its open position into its tensioned position.
  • the pull rod 13 has a section with a larger diameter than the supporting part 35, on which the axial bearing 24 is arranged.
  • the axial distance of the annular shoulder 36 from the bottom 25a of the handle 25 is the same or slightly larger than when the power amplifier is relaxed the axial width of the thrust bearing. This ensures, as in the previously described embodiment, that the strong spring force of the plate spring 23 is kept away from the thrust bearing 24 when the power amplifier is relaxed and thus the screw spindle 14 can be easily rotated by means of the handle 25 for rough adjustment of the jaw 3.
  • the clamping device is generally designed as a clamping device with a predetermined span in the sense of claim 1, then the hollow screw spindle 14 is omitted. In this case, the bushing 18 with its flange 28 is in direct contact with the movable jaw 3.
  • the angle of rotation ⁇ 1 of the actuating lever 15 should be less than 200 °, preferably less than 150 °. This is ensured in the machine vice according to the invention.
  • a feed stroke of 4 mm can be achieved by a rotation angle ⁇ of 144 °. This angle of rotation ⁇ is then followed by the angle ⁇ of 22 °, which is required to carry out the clamping stroke.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
EP91107821A 1990-06-07 1991-05-15 Spannvorrichtung mit Kraftverstärker, insbesondere Maschinenschraubstock Expired - Lifetime EP0463344B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4018284 1990-06-07
DE4018284A DE4018284C1 (enrdf_load_stackoverflow) 1990-06-07 1990-06-07

Publications (3)

Publication Number Publication Date
EP0463344A2 EP0463344A2 (de) 1992-01-02
EP0463344A3 EP0463344A3 (en) 1992-03-18
EP0463344B1 true EP0463344B1 (de) 1994-07-27

Family

ID=6407982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107821A Expired - Lifetime EP0463344B1 (de) 1990-06-07 1991-05-15 Spannvorrichtung mit Kraftverstärker, insbesondere Maschinenschraubstock

Country Status (4)

Country Link
US (1) US5171004A (enrdf_load_stackoverflow)
EP (1) EP0463344B1 (enrdf_load_stackoverflow)
JP (1) JP3200091B2 (enrdf_load_stackoverflow)
DE (1) DE4018284C1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021151668A1 (de) 2020-01-31 2021-08-05 cutpack.com GmbH Spannvorrichtung zum einspannen eines werkstücks

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4112547A1 (de) * 1991-04-17 1992-10-22 Gressel Ag Spannkrafteinstellvorrichtung fuer eine spannvorrichtung
DE9104681U1 (de) * 1991-04-17 1992-08-13 Gressel Ag, Aadorf Spannelement, enthaltend eine Schnellzustellvorrichtung kombiniert mit einem Kraftverstärker
DE4127772C2 (de) * 1991-08-22 1996-06-05 Kesel Georg Gmbh & Co Kg Mechanischer Kraftverstärker
US5688014A (en) * 1994-11-14 1997-11-18 Kot; Norbert J. Clamp having self-limiting internal overstress relief
US5975605A (en) * 1994-11-14 1999-11-02 Kot; Norbert J Enclosed clamping or gripping device with accessible load controlling spring
DE19615335C1 (de) * 1996-04-18 1997-10-02 Gressel Ag Spannvorrichtung mit mechanischem Kraftverstärker
US5887860A (en) * 1997-04-08 1999-03-30 Safeway Machinery Industry Corporation Incremental multiple-forced vise of epicyclic gear train type
US6361442B1 (en) * 2000-01-19 2002-03-26 Protech Engineering Repeatable preset torquing force vise handle for producing repeatable clamping force in a vise
DE10140191B4 (de) * 2000-05-23 2009-06-18 Georg Kesel Gmbh & Co. Kg Schnellspannvorrichtung
DE10025402B4 (de) * 2000-05-23 2010-03-25 Georg Kesel Gmbh & Co. Kg Spannvorrichtung, insbesondere Maschinenschraubstock mit Schnellspanneinrichtung
CH696845A5 (de) 2001-08-22 2007-12-31 Kesel Georg Gmbh & Co Kg Spannvorrichtung.
DE102004027058A1 (de) * 2004-06-03 2005-12-29 Gressel Ag Spannvorrichtung
DE102005033627A1 (de) * 2005-07-19 2007-01-25 GM Global Technology Operations, Inc., Detroit Vorrichtung zur Verbindung einer Zwischenwelle mit einem Ritzel eines Lenkgetriebes
US8690138B2 (en) * 2010-12-29 2014-04-08 Tseh-Pei LIN Coaxial concentric double-jaw vice
DE102014000920B4 (de) * 2014-01-28 2016-02-18 Johann Ehmann Schraubstock
TW201722628A (zh) * 2015-12-17 2017-07-01 Homge Machinery Industrial Co Ltd 倍力式虎鉗結構改良

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE1284366B (de) * 1964-04-07 1968-11-28 Arnold Franz Spannvorrichtung
DE1812325A1 (de) * 1968-12-03 1970-07-23 Arnold Franz Mechanische Spannvorrichtung,insbesondere Maschinenschraubstock
US4046364A (en) * 1976-10-01 1977-09-06 Stevens Engineering Torque limiting vise for holding work on a machine tool table
DE3729093C1 (de) * 1987-09-01 1988-12-01 Gressel Ag Spannvorrichtung mit mechanischem Kraftverstaerker
DE8717051U1 (de) * 1987-12-29 1988-02-11 Röhm, Günter Horst, 7927 Sontheim Maschinenschraubstock
DE3744561A1 (de) * 1987-12-30 1989-07-20 Franz Haimer Schraubstock
US5022636A (en) * 1990-03-26 1991-06-11 Chick Machine Tool Inc. Workholding apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021151668A1 (de) 2020-01-31 2021-08-05 cutpack.com GmbH Spannvorrichtung zum einspannen eines werkstücks

Also Published As

Publication number Publication date
EP0463344A2 (de) 1992-01-02
DE4018284C1 (enrdf_load_stackoverflow) 1991-04-18
EP0463344A3 (en) 1992-03-18
JP3200091B2 (ja) 2001-08-20
US5171004A (en) 1992-12-15
JPH0592374A (ja) 1993-04-16

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