EP0311818A1 - Etau à vis avec mâchoires de serrage - Google Patents

Etau à vis avec mâchoires de serrage Download PDF

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Publication number
EP0311818A1
EP0311818A1 EP19880115447 EP88115447A EP0311818A1 EP 0311818 A1 EP0311818 A1 EP 0311818A1 EP 19880115447 EP19880115447 EP 19880115447 EP 88115447 A EP88115447 A EP 88115447A EP 0311818 A1 EP0311818 A1 EP 0311818A1
Authority
EP
European Patent Office
Prior art keywords
clamping
workpiece
frame
edge
vise
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Withdrawn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
EP19880115447
Other languages
German (de)
English (en)
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.)
MEYWALD G
Original Assignee
MEYWALD G
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 claimed from DE8717369U external-priority patent/DE8717369U1/de
Application filed by MEYWALD G filed Critical MEYWALD G
Publication of EP0311818A1 publication Critical patent/EP0311818A1/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Withdrawn legal-status Critical Current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
    • B25B1/24—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 vice with clamping jaws, which are provided on the frame of the vise and perform a pull-down movement when applying the clamping force via a drive device with respect to a support surface for the workpiece, and with return springs acting between the frame and the clamping jaws.
  • clamping workpieces with a more or less rectangular cross section
  • a horizontally acting clamping force is applied to the workpiece in a vice
  • the clamping jaws acting on the workpiece which in turn are guided horizontally.
  • a vise also has a support surface for the workpiece and it has always been sought to pull down on the workpiece when clamping the workpiece, i. H. press the workpiece vertically from top to bottom onto the support surface.
  • a vice of the type described which has two movable jaws via a drive device.
  • bearing jaws are also provided, on which the drive device, which can be designed as a spindle, engages.
  • an inclined plane is provided, which is arranged and designed such that the clamping jaws acting on the workpiece with parallel and vertically arranged clamping surfaces exert a certain downward movement in the direction of the bearing surface for the workpiece when the clamping force is applied and thereby bring down.
  • the clamping jaws are moved obliquely downwards parallel to themselves during this clamping process.
  • return springs are provided, which remove the clamping force return the jaws to their original position on the bearing jaws.
  • These return springs are often comparatively weak.
  • the inclined plane and the return springs are surrounded by a covering seal to keep coolant and chips away from the inclined plane and thus ensure that they are pulled down.
  • the frame of the vise deforms in the elastic area.
  • the parallelism of the clamping surfaces of the clamping jaws is lost and the workpiece is clamped horizontally comparatively below, that is to say in the area of the support surface, while little or no hold is held in the upper area.
  • the pulldown is also partially or completely lost.
  • the invention has for its object to develop a vice of the type described above, which ensures with simple training that the pulldown not only in the elastic clamping area, but also in the rigid clamping area - so if the frame of the vise bends elastically - is preserved .
  • the clamping jaws on their side facing the workpiece have a clamping edge or clamping surface and then downwards each have an undercut surface that recesses relative to a vertical plane through the clamping edge or clamping surface
  • the clamping jaws are pivotally mounted about horizontal pivot axes which lie below of the support surface for the workpiece and on the side of the vertical plane facing the workpiece, and that the return springs are designed as tension springs and thus for absorbing the tension forces in the elastic range.
  • the jaws thus consciously clamp in two areas, initially in the elastic area, the is determined by the compression of the return springs designed as tension springs, and then after use of the forces of the tension springs in a rigid area in which the frame of the vise bends elastically.
  • the pull-down already occurs in the elastic range and remains in place even with rigid tensioning.
  • the workpiece is held on the clamping edge or clamping surface during the entire clamping process and does not come into contact with the recessed undercut surface.
  • the clamping edge is formed within the undercut surface by the contact of the upper edge of the sheet.
  • the clamping edge or clamping surface fulfills its function, namely in both clamping areas.
  • the clamping jaws are mounted in a very simple design so as to be pivotable about horizontal swivel axes, but these axes are arranged in such a way that the movement of the clamping edge or clamping surface has a path and force component providing the pull-down.
  • This new design it is possible to achieve a defined pull-down, which accounts for approximately 30% of the clamping force applied by the drive device.
  • the undercut surface which can be flat or curved or stepped, is designed so that it does not come into contact with the workpiece even when the frame is bent open in the rigid clamping area, so that the clamping forces over the clamping edge or Clamping surface are transferred.
  • the clamping jaws In connection with the arrangement and design of this undercut surface, the clamping jaws must be mounted so as to be pivotable about horizontal pivot axes which are arranged below the support surface for the workpiece and on the side of the vertical plane facing the workpiece.
  • the forces and paths can be divided by dimensioning the levers.
  • the clamping edge or clamping surface can on be provided at the upper end of the clamping jaws, the recessing undercut surface then joining downward.
  • the vice is suitable for clamping high and not very high workpieces.
  • the jaws are mounted in sliding bearings on the frame of the vise.
  • the drive device then acts between the two clamping jaws. It is also possible to move a clamping jaw displaceably and to store a clamping jaw in a fixed position, this clamping jaw, of course, also being pivotally mounted in its fixed bearing.
  • the clamping edge or clamping surface can be arranged on the top of the clamping jaw, that is to say it can start or lie on the upper edge of the clamping jaw.
  • the clamping edge or clamping surface it is also possible for the clamping edge or clamping surface to be arranged in the central region of the part of the clamping jaw projecting upward above the contact surface, and for an initial clamping surface to follow upwards.
  • the initial clamping surface is in the elastic range at the beginning of clamping. With increasing clamping pressure in the elastic range, the clamping edge or clamping surface then takes over its function, so that both the initial clamping surface and the recessed undercut surface are free of the workpiece.
  • the tension springs can be 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. But also Cylindrical coil springs can be used.
  • the tension springs can also be provided as a tension cushion made of a correspondingly elastic material and / or can be designed as a hydraulic tension cushion.
  • the formation of the undercut surface is tailored to the way the spring springs open. In general, it is sufficient to provide the angle of the undercut surface on the order of about 2 °.
  • the clamping jaws can be provided with legs which engage in a T-shaped groove in the frame, which are arranged such that they can be pushed past one another with different widths and whose upper free edges form the respective displaceable bearing with the frame. This makes it possible to clamp even very narrow or thin workpieces, for example an upright sheet, the bearing of the right jaw being in the clamped state to the left of the bearing of the left jaw.
  • the vise shown in Figure 1 has a frame 1, which is essentially penetrated lengthways by a T-shaped groove 2 ( Figure 2).
  • the frame 1 thus has an approximately U-shaped cross section, the webs 3 and 4 of which project inwards at the upper end, guide and contact surfaces 5, 6 being formed here.
  • the vice has two associated jaws 7 and 8, both of which have such a cross section that they are slidably disposed in the T-shaped groove 2.
  • the jaw 7 has two legs 9 which engage under the T-shaped groove 2 and can come to rest on the guide and contact surfaces 5 formed there.
  • the clamping jaw 8 has corresponding legs 10 which are arranged at a greater distance from one another than the legs 5, so that the legs 9 and 10 can be pushed past one another when clamping very thin or narrow workpieces.
  • the legs 10 can come to rest on the guide and contact surfaces 6.
  • the two clamping jaws 7 and 8 are connected to one another by a drive device, the essential component of which is a spindle 11 which passes through both clamping jaws 7 and 8, the clamping jaws 7 and 8 being pivotable in a known manner either with a nut or another contact surface about horizontal axes 12 and 13 are mounted opposite the spindle 11.
  • This pivotability relates to the pivoting of the clamping jaws 7 and 8 relative to the spindle 11.
  • clamping jaws 7 and 8 can also be pivoted relative to the frame 1, in the following way:
  • the free ends of the legs 9 and 10 form horizontal pivot axes 14 and 15, namely by abutting the Guide and contact surfaces 5 and 6, whereby movable pivot bearings are formed, depending on the length or width of the workpiece to be clamped.
  • a workpiece 16 is indicated in dashed lines in Figure 1. It rests with its underside on a support surface 17 formed on the frame 1 and is in contact with clamping edges 18 and 19, which are arranged here at the upper end of the clamping jaws 7 and 8.
  • FIG. 1 shows the state in which both clamping edges 18 and 19 first come into contact with the side wall of the workpiece 16, that is to say the clamping process begins in the elastic range.
  • the tensioning edges 18 and 19 can also be designed as tensioning surfaces, that is to say they have a certain area, whereby they are expediently designed to be curved.
  • Recessing undercut surfaces 20 and 21 adjoin the tensioning edges 18 and 19 at the bottom and spring back about 2 ° with respect to vertical planes through the tensioning edges 18 and 19.
  • the undercut surfaces 20 and 21 can be designed as flat surfaces, curved or stepped.
  • the geometric arrangement of the clamping edges 18 and 19 relative to the pivot axes 14 and 15 is essential.
  • the pivot axis 14 must be provided below or at most in the support surface 17 so that comparatively thin workpieces, eg. B. sheets, can be reliably tensioned and also a pulldown occurs.
  • the pivot axis 14 of the jaw 7 must be arranged to the right of a vertical plane 22, which is defined by the clamping edge 18.
  • the clamping jaws 7 and 8 can pivot about the pivot axes 14 and 15 during the clamping process
  • the clamping jaws 7 and 8 are provided with wedge-shaped recesses 23 and 24 on their underside, restoring springs designed as tension springs being provided in the embodiment of the figures 1 and 2 are designed as pressure pads 25 and 26.
  • These pressure pads 25 and 26 can be made of elastic material, for example a plastic or the like.
  • the arrangement of coiled steel springs or disc springs is also possible at this point.
  • the tension springs realized by the pressure cushions 25 and 26 not only serve to return the clamping jaws 7 and 8 with regard to their pivoting movement into the starting position shown in FIG. 1, but are dimensioned considerably stronger in order to be able to absorb the tensioning forces in the elastic range.
  • the elastic clamping area Upon further actuation of the drive device or rotation of the spindle 11, the elastic clamping area begins, in which the clamping jaw 7 is pivoted about the clamping edge 18 in a counterclockwise direction and with compression of the pressure pad 25 until the pivot axis 14 on the guide and contact surface 5 is one has assumed a constant position and the angle at the recess 23 has been used up, so that the clamping jaw 7 has wedged in the frame 1.
  • the undercut surface 20 still jumps back at a smaller angle with respect to the vertical plane 22, so that the clamping edge 18 still holds the workpiece 16.
  • the elastic clamping area ends and a further rotation of the spindle 11 leads to a further clamping in the rigid clamping area.
  • the frame 1 can bend up with very large clamping forces, the dimensioning and arrangement of the undercut surfaces 20 and 21 being selected such that even in this area the undercut surfaces 20 and 21 are prevented from bearing against the workpiece, so that the workpiece 16 continues to be clamped horizontally by the clamping edges 18 and 19 and the pull-down on the workpiece 16 is also maintained in the rigid region during clamping.
  • the clamping force and the pull-down force are reduced, the rigid and the elastic region being passed through in succession.
  • the parts again assume the relative position, as shown in FIG. 1.
  • FIG. 3 shows only one clamping jaw 8, which is mounted on the frame so as to be pivotable about the pivot axis 15.
  • the clamping jaw 7, not shown, of this exemplary embodiment is provided with a drive device in order to approach the clamping jaw 8 or to be removed therefrom.
  • the pivot axis 15 is realized here by a bolt 27 which passes through the legs 3 and 4 of the frame 1, which shows a fixed pivot bearing of the jaw 8, in contrast to the movable bearing according to the embodiment of Figures 1 and 2. Also here the The pivot axis 15 is arranged below the support surface and on the side of the vertical plane facing the workpiece 16 through the clamping edge 19.
  • the tension springs are designed here as plate springs or as a package of plate springs 29, which are mounted here on a bolt 30.
  • a bearing ring 31 is provided, which is rotatably mounted on the bolt 30 in a thread, so that the transition point between the elastic clamping area and the rigid clamping area can be adjusted in this way.
  • the bolt 30 is provided on the frame 1.
  • the embodiment according to FIG. 3 is particularly suitable for thin-walled workpieces 16, for example sheet metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
EP19880115447 1987-10-14 1988-09-21 Etau à vis avec mâchoires de serrage Withdrawn EP0311818A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8717369U DE8717369U1 (de) 1987-10-14 1987-10-14 Niederzugsbacke
DE3822408 1987-10-14
DE8717369U 1987-10-14
DE19883822408 DE3822408A1 (de) 1987-10-14 1988-07-01 Schraubstock mit klemmbacken

Publications (1)

Publication Number Publication Date
EP0311818A1 true EP0311818A1 (fr) 1989-04-19

Family

ID=25869682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880115447 Withdrawn EP0311818A1 (fr) 1987-10-14 1988-09-21 Etau à vis avec mâchoires de serrage

Country Status (3)

Country Link
EP (1) EP0311818A1 (fr)
JP (1) JPH01188279A (fr)
DE (1) DE3822408A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701394C1 (de) * 1997-01-16 1998-07-23 Bernhard Magerl Haltevorrichtung für mehrseitig zu bearbeitende Werkstücke
DE102009009921A1 (de) 2009-02-24 2010-08-26 Rüdiger Schenke Niederzugspannbacken
DE102022109309B3 (de) 2022-04-14 2023-05-04 Rüdiger Schenke Niederzugspanner

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2584062A (en) * 1949-04-22 1952-01-29 Glacier Co Ltd Machine vise having jaws movable downwardly when pressed against workpiece
US2728251A (en) * 1954-06-08 1955-12-27 Sheffield Twist Drill & Steel Improved vise having jaws movable downwardly when clamping a workpiece
US2770990A (en) * 1955-07-13 1956-11-20 Stanley L Shelter Hold-down vise

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE821178C (de) * 1949-12-02 1951-11-15 Bernhard Nienkemper Spannbacken fuer Schraubstoecke und Werkzeugmaschinen
DE910280C (de) * 1952-11-18 1954-04-29 Eugen Bauckhage Backen, insbesondere fuer Schraubstoecke
DE2318147A1 (de) * 1973-04-11 1974-10-31 Prewo Werkzeug Masch Niederzug-werkstueckspannvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2584062A (en) * 1949-04-22 1952-01-29 Glacier Co Ltd Machine vise having jaws movable downwardly when pressed against workpiece
US2728251A (en) * 1954-06-08 1955-12-27 Sheffield Twist Drill & Steel Improved vise having jaws movable downwardly when clamping a workpiece
US2770990A (en) * 1955-07-13 1956-11-20 Stanley L Shelter Hold-down vise

Also Published As

Publication number Publication date
DE3822408A1 (de) 1989-05-03
DE3822408C2 (fr) 1990-05-23
JPH01188279A (ja) 1989-07-27

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