EP0311819B1 - Mâchoire de serrage vers le bas - Google Patents

Mâchoire de serrage vers le bas Download PDF

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Publication number
EP0311819B1
EP0311819B1 EP88115448A EP88115448A EP0311819B1 EP 0311819 B1 EP0311819 B1 EP 0311819B1 EP 88115448 A EP88115448 A EP 88115448A EP 88115448 A EP88115448 A EP 88115448A EP 0311819 B1 EP0311819 B1 EP 0311819B1
Authority
EP
European Patent Office
Prior art keywords
jaw
clamping
gripping
bearing
workpiece
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
EP88115448A
Other languages
German (de)
English (en)
Other versions
EP0311819A1 (fr
Inventor
Günter Meywald
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
Priority to AT88115448T priority Critical patent/ATE74304T1/de
Publication of EP0311819A1 publication Critical patent/EP0311819A1/fr
Application granted granted Critical
Publication of EP0311819B1 publication Critical patent/EP0311819B1/fr
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
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2405—Construction of the jaws
    • B25B1/2473—Construction of the jaws with pull-down action on the workpiece

Definitions

  • the invention relates to a pull-down jaw for insertion into vices with a bearing jaw, a clamping jaw and with return springs acting between the bearing jaw and the clamping jaw, the clamping jaw being pivotably mounted on the bearing jaw about a horizontal pivot axis arranged in the upper region of the bearing jaw and on has a contact surface on its side facing a workpiece, which is pivotably mounted when the clamping jaw on the bearing jaw is pivoted about a horizontal pivot axis arranged in the upper region of the bearing jaw, and has a contact surface on its side facing a workpiece which pivots in the direction when the clamping force is applied on a contact surface for the workpiece.
  • a vise also has a support surface for the workpiece and it has always been sought to also pull down on the workpiece when clamping the workpiece, i. H. press the workpiece vertically from top to bottom onto the support surface.
  • a generic pull-down jaw is known from US-A-2 770 990.
  • the jaw there has a contact surface that is only slightly extended in height.
  • the clamping jaw pivots towards the support surface for the workpiece in such a way that the contact surface performs a downward movement, which takes place almost vertically, since the horizontal distance between the contact surface and the pivot axis is relatively large.
  • the contact surface performs a downward movement, which takes place almost vertically, since the horizontal distance between the contact surface and the pivot axis is relatively large.
  • the workpiece is pulled down onto the contact surface. Due to the small expansion of the contact surface, a secure hold with high workpieces is not guaranteed. Rather, there is a risk that such a high workpiece can tip over an axis parallel to the bearing surface, with extremely unfavorable leverage ratios occurring.
  • a pull-down jaw known from DE-PS 910 280 has a bearing jaw and a clamping jaw, an inclined plane being provided between the bearing jaw and the clamping jaw, which plane is designed and arranged in such a way that the clamping jaws attacking the workpiece with parallel and vertically arranged clamping surfaces during application exert a certain downward movement in the direction of the clamping force in the direction of the support surface for the workpiece and thereby bring about the pulling down.
  • the clamping jaws are shifted diagonally downwards parallel to themselves.
  • return springs are provided which, when the clamping force is removed, guide the clamping jaws back into their starting position on the bearing jaws. These return springs are often comparatively weak.
  • pendulum jaws For clamping workpieces with an irregular surface, especially with a trapezoidal cross-section, it is known to use pendulum jaws.
  • a flat jaw is suspended on the vice swinging around an axis. H. depending on its inclined surface, it lies against the workpiece during the clamping process.
  • H depending on its inclined surface, it lies against the workpiece during the clamping process.
  • only a horizontally acting clamping force comes into play. There is no intention to pull it down and it happens at random if the workpiece surface is accidentally shaped accordingly.
  • roller pull-down jaws which have a two-part jaw.
  • the part of the jaw facing away from the workpiece has an inclined plane.
  • the part of the jaw facing the workpiece is equipped with a roller mounted on it that acts on the workpiece as well as on the inclined plane.
  • Such roller pull-down jaws are used to clamp workpieces with angle springs. The roll rolls during the tensioning process on the inclined plane and down the workpiece at the same time. Since the direction of rotation of the roller is determined by the inclined plane, a corresponding pull-down is also achieved.
  • clamping jaws can either be used directly with the equipment of a vice and thus be used. However, it is also possible to design these jaws in such a way that they can subsequently be inserted into a vice with clamping jaws present there or can be attached to them.
  • the invention has for its object to design a pull-down jaw of the type described in such a way that, even at high clamping pressures, the clamping jaws rest flat on the workpiece and thus secure alignment and clamping of the workpiece is achieved even when the frame of the vise elastically deformed. A corresponding pulldown should still be effective.
  • this is achieved in that the contact surface in a parallel to the swivel axis clamping edge, which is arranged below a horizontal plane defined by the swivel axis, an upward subsequent flat clamping surface and a downward extending, with the workpiece initially coming into contact Free space is divided that a screw is provided as a stop to limit the springing of the tension springs, which is arranged between the jaw and the bearing jaw, and that the return springs are arranged as tension springs in the area of the free area and are thus designed to absorb the clamping forces in the elastic range.
  • the workpiece is aligned and guided securely during the entire clamping process due to the three-part contact surface of the clamping jaw.
  • the open spaces of two Opposing jaws align the workpiece before any clamping force is applied.
  • the clamping edges pull the workpiece down in the direction of the support surface.
  • the contact surface is of crucial importance.
  • the clamping surfaces hold the workpiece in place over a large area, the size of the last pulling force exerted by the clamping edges being preserved and the entire workpiece again being aligned in accordance with its vertically running boundary surfaces.
  • the new pull-down jaw can advantageously be made very compact. Due to the large area of the clamping surfaces, only a limited pressure is exerted on the workpiece. This prevents damage to the workpiece even with large clamping forces.
  • the clamping surfaces of the new pull-down jaw are significantly higher than in the prior art.
  • the small extent of the downward movement during the application of the pull-down force means that the free surfaces are usefully designed in such a way that they are only slightly tilted against the clamping surfaces. Angles between the two surfaces will typically only deviate by approximately 2 ° from 180 °. This arrangement of the free surface in relation to the clamping surface also determines the shape of the clamping edge. Since the clamping edge is relatively blunt, damage to the workpiece can also be avoided.
  • the new pull-down jaw deliberately clamps in two areas, first in the elastic area and then rigid after the forces of the tension springs have been used up. While only the clamping edge or clamping surface engages the workpiece in the elastic region, after the force and the travel of the tension springs have been used up, the flat clamping surface adjoining the clamping edge or clamping surface comes on the workpiece to the facility. At this point, the pulldown has already had a corresponding effect and will continue to be the case with rigid clamping. The flat clamping surface comes to rest flat on the workpiece with a corresponding rectangular cross-section. This results in a defined pulldown in the elastic area, which is retained in the rigid area of tensioning.
  • the tension springs are considerably stronger and larger than return springs in order to deliberately create an elastic tensioning area which is required for pulling down. With the stronger dimensioning of the tension springs, a considerably higher operational safety is achieved.
  • the adhesive property of the coolant can no longer have a negative effect even without the arrangement of a seal.
  • the chips that are necessary during processing also do not interfere.
  • the free area must be arranged and designed so that it does not come into contact with the workpiece even during rigid clamping.
  • the clamping edge or clamping surface which can also be designed as a curve, is provided below a horizontal plane defined by the pivot axis. Then the flat clamping surface adjoins upwards, which is advantageous in that the workpiece is clamped relatively far up, that is, away from the contact surface on the vice.
  • an extension with a semicircular cross section can be provided on one jaw and a corresponding groove on the other jaw.
  • the tension springs are expediently designed to be adjustable in their force in order to be able to determine or set the transition point from elastic to rigid tensioning.
  • the position of the clamping edge or clamping surface is matched to the position and dimensioning of the tension springs relative to the swivel axis.
  • the Leverage Act also applies here.
  • the tension springs can preferably be designed as disc springs, with relatively large tension forces being able to be achieved in the elastic range with a small space requirement. Cylindrical coil springs can also be used.
  • the invention is further described using a preferred embodiment of the pull-down jaw.
  • the figure shows a side view of the essential parts of a vise with pull-down jaws.
  • the figure shows the parts of a vise 1 which are essential for the invention and which have a frame 2, on or in which a support surface 3 for a workpiece 4 indicated by dashed lines is formed.
  • the existing clamping jaws 5 are mounted on the frame 2 in a guided manner and can be moved apart towards one another or for opening the vise by a drive (not shown) in the sense of clamping. These jaws 5 are available when such a vice is to be retrofitted with the new pull-down jaws. It is of course also possible to equip the vice 1 without these clamping jaws 5 and from the outset with the new pull-down jaws.
  • the new pull-down jaws each have a bearing jaw 6 and a clamping jaw 7.
  • the bearing jaws 6 have an approximately rectangular cross section.
  • a pivot axis 8 is realized on them, about which the clamping jaws 7 can pivot at a mostly small angle relative to the bearing jaws 6.
  • the jaws 7 have on their side facing the workpiece 4 a non-flat surface, which is composed in detail of a clamping edge 9, a flat clamping surface 10 adjoining on one side and a free surface 11 adjoining on the other side.
  • the clamping edge 9 can of course also be flat, that is to say in the form of a clamping surface or clamping curve which extends over a certain area in the vertical direction.
  • the arrangement is such that the flat clamping surface 10 does not align with the free surface 11, but an angle deviating from 180 ° is spanned between the two, which is larger in the embodiment of the figure on the side facing the workpiece.
  • tension springs 12 are arranged and switched on, the force of which determines the tension force in the elastic range. Furthermore, a screw 13 between the bearing jaw 6 and the clamping jaw 7 is provided, which forms a stop for the springing of the tension springs 12, which is adjustable. In this way, the jaw 7 can be adjusted in the elastic clamping range.
  • the figure shows the relative position of the parts when the workpiece 4 is placed on the support surface 3 for clamping purposes and the jaws 7 have approached so far that they with the clamping edge 9 (and - depending on the setting of the screw 13 - also simultaneously the free areas 11) come to rest on the workpiece 4.
  • the elastic clamping area is first run through, in which the spring travel of the tension springs 12 is consumed.
  • the clamping jaw 7 pivots about the pivot axis 8. It can be seen that the clamping edge 9 is arranged below a horizontal plane 14 defined by the pivot axis 8, so that the clamping edge 9 moves on a corresponding circular arc which is directed downwards, so that the desired pulldown occurs during elastic tensioning.
  • the workpiece is therefore already pressed onto the bearing surface 3 on the frame 2 here, whereby of course the horizontal clamping force is applied at the same time.
  • the tensioning path of the tension springs 12 is used up, the tensioning transition takes place from the elastic to the rigid area, ie tensioning can take place even further and more vigorously.
  • the flat clamping surface 10 of each clamping jaw 7 comes into contact with the workpiece 4 during this transition, while in the course of the elastic clamping the free surface 11 has increasingly moved away from the workpiece. Only the clamping edge 9 remains in contact with the workpiece 4 during the entire clamping.
  • the attack of the flat clamping surface 10 is, however, quite desirable, because in this way the workpiece 4 is held in the upper region and the force transmission in the rigid clamping region takes place over a comparatively large surface. Since the flat clamping surface 10 is also arranged somewhat obliquely to the vertical, this can counteract the elastic springing open of the frame 2 at these high clamping pressures in the rigid region.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Jigs For Machine Tools (AREA)

Claims (5)

  1. Mors d'étau à effet de traction vers le bas, destiné à être inséré dans des étaux ayant un mors d'appui, un mors de serrage et des ressorts de rappel agissant entre le mors d'appui et le mors de serrage, le mors de serrage étant monté pivotant sur le mors d'appui autour d'un axe de pivotement disposé dans la région supérieure du mors d'appui, et présentant sur sa face tournée vers une pièce à usiner une surface de contact qui exécute, lors de l'application de la force de serrage, un mouvement pivotant en direction d'une surface de pose pour la pièce,
    caractérisé en ce que la surface de contact est divisée en une arête de serrage (9) s'étendant parallèlement à l'axe de pivotement, disposée en dessous d'un plan horizontal déterminé par l'axe de pivotement, une surface plane de serrage (10) se raccordant vers le haut, et une surface libre (11) s'étendant vers le bas et venant en premier lieu en contact avec la pièce à usiner; en ce qu'il est prévu comme butée pour limiter la course élastique des ressorts de serrage une vis (13) disposée entre le mors de serrage (7) et le mors d'appui (6), et en ce que les ressorts de rappel sont agencés sous la forme de ressorts de serrage (12) dans la région de la surface libre (11) et sont ainsi agencés pour absorber les forces de serrage dans le domaine élastique.
  2. Mors d'étau à effet de traction vers le bas, selon la revendication 1, caractérisé en ce qu'il est prévu, pour former l'axe horizontal de pivotement (8) entre le mors d'appui (6) et le mors de serrage (7), un bourrelet de section semi-circulaire sur un des mors et une rainure correspondante sur l'autre mors.
  3. Mors d'étau à effet de traction vers le bas, selon la revendication 1 ou 2, caractérisé en ce que les ressorts de serrage (12) ont leur force réglable.
  4. Mors d'étau à effet de traction vers le bas, selon les revendications 1 à 3, caractérisé en ce que la position de l'arête de serrage (9) ou de la surface de serrage par rapport à l'axe de pivotement (8) est coordonnée avec la position et le dimensionnement des ressorts de serrage (12).
  5. Mors d'étau à effet de traction vers le bas, selon les revendications 1 à 4, caractérisé en ce que les ressorts de serrage (12) sont sous la forme de rondelles Belleville.
EP88115448A 1987-10-14 1988-09-21 Mâchoire de serrage vers le bas Expired - Lifetime EP0311819B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88115448T ATE74304T1 (de) 1987-10-14 1988-09-21 Niederzugsbacke.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3734780A DE3734780C1 (de) 1987-10-14 1987-10-14 Niederzugsbacke
DE3734780 1987-10-14

Publications (2)

Publication Number Publication Date
EP0311819A1 EP0311819A1 (fr) 1989-04-19
EP0311819B1 true EP0311819B1 (fr) 1992-04-01

Family

ID=6338319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88115448A Expired - Lifetime EP0311819B1 (fr) 1987-10-14 1988-09-21 Mâchoire de serrage vers le bas

Country Status (6)

Country Link
US (1) US4905974A (fr)
EP (1) EP0311819B1 (fr)
JP (1) JPH01127277A (fr)
AT (1) ATE74304T1 (fr)
DE (2) DE3734780C1 (fr)
ES (1) ES2031975T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3924641C1 (fr) * 1989-07-26 1991-02-28 Aeg-Elotherm Gmbh, 5630 Remscheid, De
DE4014565A1 (de) * 1990-05-07 1991-11-14 Gottfried Stampfer Niederzug-spannvorrichtung
DE20304531U1 (de) * 2003-03-21 2004-08-05 Wolfcraft Gmbh In eine Bohrung einer Werkplatte einsteckbares Kunststoff-Spannelement
DE102004062048A1 (de) * 2004-12-23 2006-07-06 Holzma Plattenaufteiltechnik Gmbh Vorschubvorrichtung für plattenförmige Werkstücke
KR100820166B1 (ko) 2006-11-16 2008-04-07 장만성 바이스용 패드
AT506147B1 (de) * 2007-12-13 2012-09-15 Rainer Erne Positioniereinrichtung zur befestigung eines werkstücks

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE383727C (de) * 1919-10-05 1923-10-27 Schmidt Karl Durchgangssitzventil
US1692398A (en) * 1926-01-02 1928-11-20 Weaver Mfg Co Vise
US2509888A (en) * 1947-07-07 1950-05-30 Wickes Bros Power locking driye chuck
GB674063A (en) * 1949-04-22 1952-06-18 Glacier Co Ltd Improvements in or relating to vices
US2760535A (en) * 1952-09-08 1956-08-28 Mertz David Threaded stud and nut actuated quick-set clamp
DE910280C (de) * 1952-11-18 1954-04-29 Eugen Bauckhage Backen, insbesondere fuer Schraubstoecke
US2770990A (en) * 1955-07-13 1956-11-20 Stanley L Shelter Hold-down vise
CH383727A (de) * 1960-03-08 1964-10-31 Stucki Werner Werkzeug zum Festhalten von Werkstücken, insbesondere bei Metallbearbeitungs-Werkzeugmaschinen
DE1292099B (de) * 1964-03-11 1969-04-03 Felice Amedio Paul De Schraubstock
FR1447717A (fr) * 1965-09-23 1966-07-29 Edmund Gressel Ag Mordache de serrage en profondeur, en particulier pour étaux de machines-outils
DE1279569C2 (de) * 1966-09-05 1973-11-22 Oarallelschraubstock mit nierzugbacken
GB1168183A (en) * 1967-05-18 1969-10-22 Pendry & Son Addlestone Ltd Improvements in Work Holders for Machine Tools
DE1807060A1 (de) * 1967-11-15 1969-06-12 Emato Ag Niederzugbacke,insbesondere fuer Schraubstoecke
FR2003326A1 (fr) * 1968-03-06 1969-11-07 Ogino Mitsuzo
DE2318147A1 (de) * 1973-04-11 1974-10-31 Prewo Werkzeug Masch Niederzug-werkstueckspannvorrichtung
US4039115A (en) * 1976-06-01 1977-08-02 Acf Industries, Incorporated Apparatus for obtaining abutting contact of hollow tank courses to be circumferentially welded
US4353561A (en) * 1980-08-26 1982-10-12 The United States Of America As Represented By The Unites States Department Of Energy Self-aligning lathe chuck jaws
US4431202A (en) * 1982-04-05 1984-02-14 J. & S. Tool Company Pivoted jaw members

Also Published As

Publication number Publication date
JPH01127277A (ja) 1989-05-19
DE3869723D1 (de) 1992-05-07
DE3734780C1 (de) 1989-02-09
ATE74304T1 (de) 1992-04-15
ES2031975T3 (es) 1993-01-01
EP0311819A1 (fr) 1989-04-19
US4905974A (en) 1990-03-06

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