EP0322917A2 - Etan - Google Patents

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Publication number
EP0322917A2
EP0322917A2 EP88121860A EP88121860A EP0322917A2 EP 0322917 A2 EP0322917 A2 EP 0322917A2 EP 88121860 A EP88121860 A EP 88121860A EP 88121860 A EP88121860 A EP 88121860A EP 0322917 A2 EP0322917 A2 EP 0322917A2
Authority
EP
European Patent Office
Prior art keywords
thread
threaded nut
base frame
threaded
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Withdrawn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
EP88121860A
Other languages
German (de)
English (en)
Other versions
EP0322917A3 (fr
Inventor
Josef Gail
Franz Haimer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0322917A2 publication Critical patent/EP0322917A2/fr
Publication of EP0322917A3 publication Critical patent/EP0322917A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a vice comprising a base frame, a fixed jaw that can be locked in various positions on this base frame, a running jaw guided in a linear guide of the base frame, an axially parallel to the linear guide of the base frame, arranged spindle arrangement, this spindle arrangement engages with a first threaded portion in a threaded nut fixedly connected to one of the two jaws, the spindle arrangement being axially supported on the base frame by an axial support bearing, the spindle arrangement further comprising a Tensioning the running jaw has a specific torque application point and a switchover device is provided which, when the running jaw is tensioned against the fixed jaw by continuously giving a rotational movement to the torque application point, causes a change in transmission ratio from a predetermined clamping force, in the sense that the clamping force increase per angular unit of rotation at the Torque application point becomes smaller.
  • a vice of this basic function is known from DE-PS 12 89 799.
  • the spindle arrangement is constructed in several parts.
  • An overload clutch is arranged between successive parts of the spindle.
  • the overload coupling connects the two parts of the spindle arrangement to one another.
  • the overload clutch opens.
  • the cheekpiece further part of the spindle arrangement acts on a toggle lever system and, via this toggle lever system, presses the clamping jaw increasingly against the workpiece to be clamped in each case.
  • the structure of the known device is particularly complicated and costly because of the use of the toggle lever system and the split spindle. It is difficult to build the toggle lever system as small as is necessary for certain special vices, particularly for clamping workpieces on machine tools and machining centers.
  • the invention has for its object to build a vice of the type mentioned simple and inexpensive and thereby create the conditions for a unit as small as possible.
  • a second thread is arranged on the spindle arrangement in the same direction as the first thread, which thread is non-rotatably connected to the first thread, that this second thread has a pitch different from the first thread, that on this second thread Thread a threaded nut is arranged, that the threaded nut is axially supported on the base frame, that the threaded nut and the second thread are connected via an overload coupling and that a rotary brake is provided between the base frame and the threaded nut, the clamping of the running jaw relative to the fixed jaw at a predetermined clamping force, the threaded nut is connected to the second thread by the overload coupling for common rotation and the rotary brake permits the threaded nut to rotate with respect to the base frame and when over If this predetermined clamping force is exceeded, the rotary brake makes the threaded nut non-rotatable relative to the base frame and the overload clutch permits the second thread to be rotated relative to the threaded nut.
  • the change in gear ratio is based on the differential effect of the first and the second thread.
  • the approach step per revolution of the torque application point corresponds to the pitch of the first thread.
  • the vice construction according to the invention can be constructed from simple standard parts or parts that are easy to manufacture.
  • the installation effort is low.
  • the space requirement is also low.
  • the vices according to the invention are in particular - but not exclusively - intended and suitable for clamping workpieces on machine tools and assembly centers.
  • connection between the increase in clamping force when the running jaw approaches the fixed jaws on the one hand and the turning of the turning brake can be easily established in that the threaded nut is axially adjustable against the base frame against elastic resistance and that the turning brake is dependent on the elastic travel range Threaded nut exerts a changing braking effect compared to the base frame. Once this braking effect has set in, the overload clutch is inevitably released because the transmission torque of the overload clutch is no longer sufficient to take the threaded nut against the resistance of the rotary brake from the spindle arrangement.
  • the rotary brake can be manufactured in any way, for example in such a way that the threaded nut is supported on the base frame by a brake ring and possibly at least one plate spring.
  • the brake ring can experience a narrowing due to the application of axial force and its narrowing inner diameter can act on an outer circumferential surface of the threaded nut.
  • Overload clutches are also available in a wide variety of designs. According to a preferred embodiment it is provided that the overload clutch is each formed by an axially acting coupling surface of the threaded nut and a coupling shoe which is mounted on the spindle arrangement in a rotationally fixed but axially displaceable manner and that an axial suspension supported on the spindle arrangement acts on this coupling shoe to press the coupling surfaces against one another.
  • the coupling surfaces can be designed, for example, as complementary conical surfaces.
  • the coupling surfaces can be lifted off from one another by the interaction of an axial stop of the spindle arrangement and a counter stop of the clutch shoe after the predetermined tensioning force has been exceeded a rotation of the second thread with respect to the threaded nut has started. It then causes the axial relative movement between the second thread and the threaded nut a mutual lifting of the coupling surfaces due to their relative screwing.
  • an axial displacement of the coupling shoe relative to the base frame caused by the axial stop and the counter stop can be limited by an adjustable coupling shoe stop attached to the base frame.
  • the coupling stop can be formed by a threaded ring which surrounds the spindle arrangement and which is screwed to a counter thread of the base frame.
  • the axial suspension on the spindle arrangement can be supported in an axially adjustable manner, ie the preload of the axial suspension can be changed.
  • the axial suspension can be supported on a support ring which is screw-mounted on the spindle arrangement by means of a further thread.
  • the support ring is housed within the threaded ring and the threaded ring is screwed into an internal thread of the base frame by means of an external thread.
  • rotation path limiting means are provided between the threaded nut and the clutch shoe, which are used to press the Limit the coupling surfaces of the threaded nut and the coupling shoe.
  • the threaded nut is arranged within an end wall of the base frame, that the rotary brake is arranged in a recess of this end wall and that the torque application point and the overload clutch are arranged on the side of this end wall remote from the running jaw are.
  • the spindle arrangement is composed of several parts which can be rotated relative to one another, it is possible in the embodiment according to the invention that the spindle arrangement has a one-piece spindle carrying the first thread, the second thread, the torque application point and possibly the further thread is formed. This is one of the foundations for a particularly simple and compact structure.
  • the threaded nut and the first thread rotate relative to each other when tightening, particularly after a change in gear ratio under a large axial load, it is recommended that the threaded nut be arranged interchangeably on the running jaw so that the threaded nut can be exchanged after any wear.
  • the same torque application surfaces for a torque introduction tool are attached, which - in order also to be able to set the opening point of the clutch - is preferably also designed to engage in the clutch shoe stop.
  • the base frame of the vise is generally designated 10.
  • This base frame is composed of two base frame parts 10a and 10b, which are connected to one another by a schematically indicated screw connection 10c.
  • a fixed jaw 12 is attached to the base frame part 10a and can be fixed in different positions of the base frame part 10a.
  • a linear guide 14 is formed on the base frame part 10a, which forms the upper exit of an essentially U-shaped guide channel delimited by the base frame part 10a.
  • Running jaw 16 guided by means of a guide member 18.
  • a threaded nut 22 is arranged on the guide part 18 within the channel 20 and, as indicated by broken lines 24, represents a separate, replaceable part.
  • the threaded nut 22 is in threaded engagement with a first thread 26, which is attached to a spindle, generally designated 28.
  • the spindle 28 has at its right end in FIG. 1 a torque application point 30 in the form of an Allen key.
  • a second thread 32 is attached to the spindle 28 and, like the first thread 26, is designed as a left-hand thread for reasons to be discussed later.
  • the second thread 32 is screwed to a threaded nut 34 which is located in the region of an end wall 36 of the base frame part 10b.
  • This threaded nut 34 has a support flange 35, which is housed within a recess 38 of the end wall 36.
  • the support flange 35 bears against a plate spring assembly 40, which acts on the one hand on a brake ring 42.
  • the brake ring 42 lies against a bottom surface 44 of the recess 38 and, with its radially inner edge formed by tabs 46 distributed over the circumference, lies against an outer circumferential surface 48 of the threaded nut 34.
  • An overload clutch 50 is arranged between the threaded nut 34 and the spindle.
  • a coupling shoe 52 is rotatably but axially displaceable on the threaded spindle by means of a spline connection 54.
  • This coupling shoe 52 has a conical coupling surface 52a which interacts with a complementary conical coupling surface 34a of the threaded nut.
  • the clutch shoe 52 is biased in the axial direction to the left by a plate spring 56.
  • the plate spring 56 is supported on a support ring 58, which is screwed to the spindle 28 by a further thread 60 and is thus axially adjustable.
  • the spindle 28 is rotated clockwise when viewed in the direction of arrow II in FIG. 1.
  • the threaded nut 34 rotates with the second thread 32 thanks to the coupling action of the overload clutch 50.
  • the spindle 28 is thus supported by the threaded nut 34 and the plate spring 40 and the brake ring 42 on the end wall 36 in the axial direction.
  • the first thread 26 rotates within the thread nut 22. This means, taking into account the formation of the first thread 26 as a left thread, that the running jaw 16 is moved to the left in FIG. 1.
  • the clutch torque generated by the plate spring 56 and the clutch surfaces 34a, 52a is no longer sufficient to ensure the driving effect of the spindle 28 on the threaded ring 34 via the overload clutch 50. This means that the threaded nut 34 from now on is prevented from rotating the spindle 28 by the rotary brake 37 and the coupling shoe 52 rotates relative to the threaded nut 34.
  • the two same-left threads 32 have different pitches, namely the pitch of the second thread 32 is a little smaller than the pitch of the first thread 26.
  • the pitch of the first thread is 6 mm and the pitch of the second thread 32 5.8 mm.
  • the slipping torque of the overload clutch 50 can be adjusted by changing the preload of the plate spring 56.
  • the clutch shoe 52 moves further to the right in FIG. 1 and finally comes to an end stop surface 52d against a clutch shoe stop 61, which is from the left End of a threaded ring 62 is formed and has a stop surface 62a.
  • the threaded ring 62 is screwed to an external thread 62b in an internal thread 36c of an extension 36b of the end wall 36.
  • the sense of pitch of the threads 62b and 36c is now such that the threaded ring 62 turns clockwise when it is rotated relative to the extension 36b (again viewed in the direction of arrow II in FIG Fig. 1) screwed to the left in Fig. 1.
  • the clutch shoe 52d comes to bear against the clutch shoe stop 61 in the course of the rotation of the spindle 28 in a clockwise direction, the clutch shoe 52 wants to rotate the clutch shoe stop 61 in a clockwise direction.
  • the clutch shoe stop 61 would be screwed axially in the opposite direction to the clutch shoe 52, so that joint rotation of the clutch shoe 52 and the clutch shoe stop 61 is ruled out.
  • the cooperating threads 62b and 36c can also be replaced by a bayonet lock, for example with an oblique slot in the extension 36b and a follower pin in the clutch shoe stop 61.
  • the setting of the clutch shoe stop 61 relative to the extension 36b can also be ascertained by an index system in various discrete and tactile positions.
  • the clamping force to be applied between the two jaws 12, 16 is therefore limited by the interaction of the stop surfaces 52d of the clutch shoe 52 and 62a of the clutch shoe stop 61. It is not possible to over-tighten the vice.
  • the spindle 28 is rotated counterclockwise. Then the first thread 26 is screwed to the left relative to the threaded nut 22 and the thread 32 is also screwed to the left relative to the threaded nut 34.
  • the coupling surfaces 34a and 52a move towards each other again and at the same time the plate springs 40 relax. Finally, the coupling surfaces 34a and 52a are engaged again under the action of the plate spring 52 and the plate springs 40 are relaxed so far that the coupling shoe 52 removes the threaded ring 34 again takes along, in counterclockwise direction. Now the threaded ring 34 rotates with the second thread 32 and the running jaw 16 becomes axially fixed spindle 28 withdrawn to the right, the return stroke to the right per rotation of the spindle 28 again corresponding to the pitch of the first thread 26.
  • means of rotation limitation 64 are provided in the form of an axial pin 64a on the coupling shoe 52 and a radial pin 64b on the threaded nut 34.
  • one or more Allen openings 66 are provided in the clutch shoe stop 61.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
EP88121860A 1987-12-30 1988-12-29 Etan Withdrawn EP0322917A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3744561 1987-12-30
DE19873744561 DE3744561A1 (de) 1987-12-30 1987-12-30 Schraubstock

Publications (2)

Publication Number Publication Date
EP0322917A2 true EP0322917A2 (fr) 1989-07-05
EP0322917A3 EP0322917A3 (fr) 1990-04-18

Family

ID=6343861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88121860A Withdrawn EP0322917A3 (fr) 1987-12-30 1988-12-29 Etan

Country Status (2)

Country Link
EP (1) EP0322917A3 (fr)
DE (1) DE3744561A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5171004A (en) * 1990-06-07 1992-12-15 Gressel Ag Clamping device with force amplifier, especially machine vise
EP3623105A1 (fr) * 2018-09-14 2020-03-18 ALLMATIC-Jakob Spannsysteme GmbH Dispositif de transmission de couple et dispositif de serrage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016117420B3 (de) 2016-09-15 2018-03-01 Allmatic-Jakob Spannsysteme Gmbh Spannantrieb und Zentrischspannsystem

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE533877A (fr) *
US2148800A (en) * 1937-10-04 1939-02-28 Fred F Billings Differential screw for vises
DE926400C (de) * 1953-05-22 1955-04-18 Willi Seikel Gewindespindel
US2718165A (en) * 1954-08-23 1955-09-20 Cleveland Pneumatic Tool Co Compound, differential ball screw
GB760601A (en) * 1953-12-17 1956-11-07 Henry Bruin Sanders Improvements in or relating to screw vices, jacks and the like screw operated devices
GB779153A (en) * 1954-04-07 1957-07-17 Albert Charles Trow Improvements in or relating to vices and other screw-operated mechanisms
US2800804A (en) * 1954-03-24 1957-07-30 Morris J Olschwang Automatic torque multiplier
FR1317972A (fr) * 1963-05-10
FR1331361A (fr) * 1962-02-23 1963-07-05 Dispositif de serrage et d'avances perfectionné
DE1289799B (de) * 1967-02-09 1969-02-20 Arnold Franz Spanneinrichtung, insbesondere Maschinenschraubstock

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE533877A (fr) *
FR1317972A (fr) * 1963-05-10
US2148800A (en) * 1937-10-04 1939-02-28 Fred F Billings Differential screw for vises
DE926400C (de) * 1953-05-22 1955-04-18 Willi Seikel Gewindespindel
GB760601A (en) * 1953-12-17 1956-11-07 Henry Bruin Sanders Improvements in or relating to screw vices, jacks and the like screw operated devices
US2800804A (en) * 1954-03-24 1957-07-30 Morris J Olschwang Automatic torque multiplier
GB779153A (en) * 1954-04-07 1957-07-17 Albert Charles Trow Improvements in or relating to vices and other screw-operated mechanisms
US2718165A (en) * 1954-08-23 1955-09-20 Cleveland Pneumatic Tool Co Compound, differential ball screw
FR1331361A (fr) * 1962-02-23 1963-07-05 Dispositif de serrage et d'avances perfectionné
DE1289799B (de) * 1967-02-09 1969-02-20 Arnold Franz Spanneinrichtung, insbesondere Maschinenschraubstock

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5171004A (en) * 1990-06-07 1992-12-15 Gressel Ag Clamping device with force amplifier, especially machine vise
EP3623105A1 (fr) * 2018-09-14 2020-03-18 ALLMATIC-Jakob Spannsysteme GmbH Dispositif de transmission de couple et dispositif de serrage
DE102018122600B3 (de) * 2018-09-14 2020-03-19 Allmatic-Jakob Spannsysteme Gmbh Drehmomentübertragungsvorrichtung und Spannvorrichtung

Also Published As

Publication number Publication date
EP0322917A3 (fr) 1990-04-18
DE3744561C2 (fr) 1989-12-28
DE3744561A1 (de) 1989-07-20

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