EP0946335A1 - Etrier de serrage avec elements de serrage rotatifs et coulissants - Google Patents

Etrier de serrage avec elements de serrage rotatifs et coulissants

Info

Publication number
EP0946335A1
EP0946335A1 EP97953820A EP97953820A EP0946335A1 EP 0946335 A1 EP0946335 A1 EP 0946335A1 EP 97953820 A EP97953820 A EP 97953820A EP 97953820 A EP97953820 A EP 97953820A EP 0946335 A1 EP0946335 A1 EP 0946335A1
Authority
EP
European Patent Office
Prior art keywords
clamping
clamp
elements
base plate
clamping elements
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Withdrawn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
EP97953820A
Other languages
German (de)
English (en)
Inventor
Wilfried Lichtenberg
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.)
V Clamp International Pty Ltd
Original Assignee
V Clamp International Pty Ltd
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 V Clamp International Pty Ltd filed Critical V Clamp International Pty Ltd
Publication of EP0946335A1 publication Critical patent/EP0946335A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B25B5/00—Clamps
    • B25B5/003—Combinations of clamps
    • 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
    • B25B5/00—Clamps
    • B25B5/14—Clamps for work of special profile
    • B25B5/145—Clamps for work of special profile for plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S269/00—Work holders
    • Y10S269/902—Work holder member with v-shaped notch or groove

Definitions

  • the present invention relates to a clamp and in particular a clamp for clamping rigid workpieces.
  • the invention was primarily developed for use as a clamp in the woodworking industry, and the description below follows in this context. However, the invention is in no way limited to the field of application mentioned, and it can equally be used for holding or clamping any rigid workpieces.
  • the vice is a tool that is widely used and essentially consists of two steel plates that are pulled together by a guide screw. While the vice is very appropriate for clamping of individual workpieces, or for clamping of parallel work pieces, it is not j edoch versatile because it is unsuitable for clamping asymmetric or irregularly shaped workpieces.
  • the patent US-A-4 767 110 discloses a modified vice which is also suitable for clamping irregularly shaped workpieces.
  • This patent describes a work table that has two jaws. Each of these two jaws has a plurality of connection holes. At least three clamping elements are detachably mounted in these connection holes. The clamping elements are attached so that one of these clamping elements is located in one of the clamping jaws and the other two clamping elements in the second clamping jaw.
  • the clamping elements are mounted by means of an eccentrically mounted shaft in the connection holes.
  • the respective clamping elements can thus be removed from the respective connection holes independently of one another otherwise used in such a way that the clamping elements can be adjusted in the longitudinal direction independently of the two clamping jaws.
  • these clamping elements are rotatably supported by means of the shaft, an individual angular adjustment of the clamping elements being made possible.
  • each of the clamping elements is provided with a lever.
  • this device offers greater flexibility with regard to the clampable workpiece shape, there are still limits because this device must be mounted on a workbench and because rapid adjustment of the clamping jaws is not possible. Furthermore, handling is difficult because the clamping jaws have to be moved towards one another, while at the same time a force has to be exerted on each lever on the clamping elements. So that the clamping elements hold the workpiece securely, a normal force must be exerted on the contact surface. This normal force is necessary in order to prevent the workpiece from simply slipping between the clamping elements when there are insufficient frictional forces between the workpiece and the clamping element, without causing a rotation of the clamping elements that would be useful for clamping.
  • EP-A-0 267 982 discloses a clamp in which the clamping elements have to be individually aligned by hand in order to get into the working position. In the working position, the two clamping elements face each other exactly. This means that the user of this clamp according to the prior art must align the clamping elements with both hands, so that he can not simultaneously operate the handle for actuating the clamping screw.
  • a clamp is also known according to the preamble of claim 1.
  • the user is able to move the two clamping elements of a clamping group apart by actuating a slide in order to arrange the workpiece between the two clamping elements. Then the two clamping elements are retracted as far as possible by operating the slide.
  • the workpiece is subsequently clamped by actuating the Gewmdespmdel, pressure must be exerted on the slide simultaneously with the other hand in the initial phase.
  • an object of the present invention is to increase the ease of use when handling a clamp of the type mentioned above by reducing the number of work steps required.
  • Another object of the present invention is to provide a clamping clamp with automatically positioning and adjusting clamping elements.
  • Another object of the invention is to provide a clamp, the clamping elements of which can grip a workpiece in a frictional manner before the actual clamping process, without the user having to exert compressive forces on the clamp.
  • the clamp of the present invention has at least one clamping group with at least two clamping elements that can be moved within converging elongated holes without hindering the rotation of the clamping elements from a first to a second position.
  • Each clamping element is preferably oval in cross section, the cross section being perpendicular to the longitudinal axis of the clamping element.
  • each clamping element is designed as a modified triangular bar, the cross section being triangular.
  • the cross section is perpendicular to the longitudinal axis of the tensioning element.
  • This modified triangular bar has a curved peripheral surface laterally from one edge to the opposite edge, and each of these curved peripheral surfaces is formed from a different material. This means that three different peripheral surfaces are available, each of which has a different hardness, flexibility and surface structure.
  • each clamping element is conically shaped in the direction of its longitudinal axis, the pointed end of the cone being in the immediate vicinity of the elongated holes.
  • the opening angle of the cone is approximately 1-2 °, preferably 1.5 °. This taper compensates for the expansion of the clamping elements under the action of force.
  • the clamp according to the present invention includes a second clamping group which is movable relative to the first and which serves to exert the force required for clamping on the workpiece and thereby to move the workpiece in the direction of convergence of the two elongated holes.
  • This second clamping group preferably consists of a steel disc which is connected to a threaded shaft.
  • the Gewmdespmdel sits in a corresponding counterpart.
  • the second clamping group can thus be moved in the linear direction by rotating the spindle.
  • the second clamping group can be structurally identical to the embodiment described above.
  • the connecting pieces of the two clamping groups are each attached to one end of a coupling element, which enables the relative movement of the first clamping group to the second clamping group.
  • the coupling element can consist of a threaded screw and a tube with an internal thread.
  • An advantage of the preferred embodiment of the present invention is the fact that, due to the restoring force acting between the clamping elements, rapid and automatic adjustment and positioning of the displaceable clamping elements on the workpiece to be clamped is possible.
  • the lateral forces exerted by the clamping elements on the workpiece are provided before the actual clamping process begins by a restoring force acting between the clamping elements displaced in the elongated holes due to the deflection of the resilient means, which the clamping elements m in the direction of convergence which drives back oblong holes. Due to this initially occurring lateral force, the clamping elements automatically attach themselves to the workpiece, so that the latter is securely gripped without sliding.
  • This preferred construction enables the automatic adjustment of the workpiece, which has been brought into the gap between the clamping elements, and thus no additional pressure on the clamping elements is necessary in order to ensure sufficient frictional engagement between the workpiece and both clamping elements before the actual clamping process begins.
  • FIG. 1 is a bottom perspective view of a clamp according to the present invention
  • FIG. 2 shows a side view of the clamping clamp according to FIG. 1 with a clamped workpiece
  • FIG. 3 is a front view of the clamping group with the clamping elements in the rest position, the slide being omitted here,
  • FIG. 4 schematically shows a bottom view of the clamping group according to FIG. 3 with the clamping elements in the working position, the workpiece being omitted,
  • FIG. 5 shows schematically the clamping group according to FIG. 4 with clearly rotated clamping elements after clamping the workpiece (not shown) by actuating the screw,
  • Figure 6 shows schematically an illustration of an alternative shape of the tensioning elements, wherein.
  • FIG. 7 shows a bottom view of a further embodiment with identical first and second clamping groups
  • Figure 8 shows a lateral cross section of a clamping element (14) according to the invention, in which the axis (19) is offset relative to the longitudinal direction of the elongated hole (16), and wherein
  • FIG. 9 shows a bottom view of the clamping element (14, 15) from FIG. 8, in which the contact surfaces of the clamping elements are facetted.
  • a clamp (10) with first and second clamping groups (11, 12) is shown, these being connected to a rod (13).
  • Rod (13) is preferably a polygonal rod. This is a particularly advantageous aspect of the invention, since it allows the two clamping groups to form a defined angle to one another -1 - can receive. Workpieces whose parts to be clamped are not exactly perpendicular to each other can thus be reliably clamped. This feature can be realized in the overall position or together with the other new advantageous features of the invention.
  • the end of the polygonal rod (13) is preferably rounded to the rotation of the clamping group (12) on the rod
  • the polygon is exemplified as an octagon.
  • the foot (21 ') of the bracket (21) can either be designed as an octagonal socket as shown or as a hexagonal socket for receiving the octagonal rod (13).
  • the latter embodiment advantageously allows the clamping element (12) to be rotated in 22.5 ° increments.
  • the first clamping group (11) consists of two clamping elements (14, 15) which are slidably mounted in each of the two elongated holes (16) of a base plate (17).
  • the two elongated holes are arranged so that they converge to the upper end of the base plate (17) at the greatest distance from the second clamping group (12).
  • the two elongated holes (16) preferably form an angle of approximately 40 ° with one another.
  • Each clamping element (14, 15) consists of a head part (18) which is rigidly connected to an axis (19), each of which is mounted in one of the two elongated holes (16).
  • each of the two clamping elements (14, 15) can be moved slightly despite the mounting m the elongated holes, and yet the clamping elements are mounted on the base plate (17).
  • the axes (19) of the head parts (18) m with respect to the longitudinal axes elongated holes (16) are not arranged centrally but laterally offset (ie eccentrically) (see FIG. 8), which means that the following Coated rotation of the clamping elements (14, 15) is supported.
  • each of the two clamping elements can also be rotated through 360 ° about its own longitudinal axis.
  • Axial ball bearings (20) are mounted to enable the clamping elements to rotate.
  • the tensioning elements (14, 15) have extensions (35, 36) on the upper side of the base plate (17), which are connected to one another by resilient means (39), such as a helical spring.
  • a slide (155) is designed as a slide and designed in such a way that it is in engagement with both extensions (35, 36).
  • the slide (155) consists essentially of a T-piece and enables simultaneous movement of the clamping elements (14, 15).
  • the clamping elements (14, 15) can thus be pushed in a very simple manner by actuating the slide to pick up the workpiece from its rest position (see FIG. 3) m a deflected position with an enlarged gap width (see FIG. 4).
  • the slide (155) is advantageously guided by guide means (111).
  • Said guide means (111) can, for example, by a guide rod (111) running parallel to the longitudinal axis of the base plate, on which a perforated slide (155) slides, or (see FIG. 7) by a guide groove (37), which is a slide with an extension (40) intervenes, be realized.
  • the second clamping group (12) consists of a bracket (21) which is mounted on a rod (13) and extends away from it.
  • Rod (13) is preferably screwed to a base (127) which extends from an elevation (157) of the base plate (17).
  • a threaded bore (22) is located at the lower end of the bracket (21) and receives a threaded spindle (23).
  • a steel disc (24) is rotatably attached to this threaded spindle by means of a ball joint (25).
  • a handle (26) is attached.
  • the second clamping group (12) is arranged so that the rotation of the handle (26) results in a linear movement. This movement takes place in the direction of the first clamping group (11) or in the opposite direction.
  • FIGS. 4 and 5 schematically illustrate the clamping process of the first clamping group (11).
  • the workpiece is introduced into the gap (28) existing between the clamping elements (14, 15) as described above, the clamping elements (14, 15) automatically moving into the working position (FIG. 4) after the slide (34 or 38) is released Position and adjust the workpiece.
  • the two clamping elements (14, 15) can grip the workpiece securely due to the spring force, so that further handling is simplified.
  • the clamping elements (14, 15) are also shaped such that rotation of the same from the first position (as shown in FIG. 4) to the second position (as shown in FIG. 5) results in the distance between the clamping elements (14, 15) is reduced regardless of their position within the elongated holes (16).
  • the tensioning elements (14, 15) are oval-cylindrical in shape.
  • the second clamping group (11) is then brought to a stop on the workpiece so that a force can be exerted on the workpiece which is located in the gap (28) between the two clamping elements (14, 15).
  • the second clamping group (12) generates the required force which is necessary to move the workpiece m arrow P, the clamping clamp (10) m being completed by the second clamping group (12).
  • the force initially acting which acts on the clamping elements (14, 15) by movement of the workpiece in the direction of arrow P, is partly dependent on the given coefficient of friction. Consequently, the clamping elements (14, 15) are formed on their peripheral surfaces from a non-slip, "non-slip" material, so that a relatively high coefficient of friction is ensured. So that the workpiece is not damaged during the clamping process, the clamping elements are also formed on their peripheral surface from a relatively flexible material. The flexible property of the material results in an increase in the contact surfaces of the tensioning elements (14, 15), since these are deformed, especially under the action of force.
  • FIG. 6 shows an alternative shape of the tensioning elements (14, 15), the head parts (18) being in the form of a modified triangular bar.
  • the head portion (18) rotates from the first to the second position, the width of said gap (28) is reduced, each of the peripheral surfaces is curved from one edge to the opposite edge.
  • a head part shaped in this way it is possible to form the individual surfaces in each case from different materials, each with different hardness and different adhesive and friction properties.
  • the tensioning elements In order to counteract the expansion of the tensioning elements (14, 15) under the action of force, it is further preferred to use the tensioning elements in the direction of their longitudinal axis as a downwardly widening cone with an opening angle of 1-2 °. preferably 1.5 ° to train.
  • This feature thus represents a further advantageous aspect of the invention, which can be implemented alone or in connection with the other features.
  • the second clamping group (12) which, by moving the steel disk (24) in the direction of the first clamping group (11), causes the predetermined movement of the workpiece.
  • two clamping groups (11 ', 11') which are similar to the clamping group (11) described and which are connected to one another form a complete clamping clamp.
  • the function of these two clamping groups (11 ') is identical to that previously described.
  • the automatic positioning and adjustment of the clamping elements of each clamping group is particularly advantageous in this embodiment, since the user can attach the clamping clamp to the workpiece in the work position in a single operation. A separate positioning and adjustment of both clamping groups is therefore no longer necessary since the clamping elements (14, 15) of both clamping groups (11 ', 11') automatically grip the workpiece between them in the sense of the above-described effect of the resilient means (39).
  • the required predetermined movement of the workpiece and thus the clamping between the two clamping groups (11 ', 11') is achieved by changing the distance between the two clamping groups (11 ', 11').
  • This change in said distance is made possible by a coupling element (30) which connects the two clamping groups (11 '. 11') to one another.
  • This coupling element consists first of all of a threaded spindle (31) which is detachably connected to one of the two clamping groups and secondly of a tube (32) with an internal thread which receives the threaded spindle (31).
  • the tube (32) with internal thread is detachably connected to the second clamping group (11), but it is rotatably supported about its own axis by means of an axial ball bearing (33) relative to the second clamping group (11 ').
  • the rotation of the tube (32) causes a linear relative movement of the two clamping groups (11 ', 11') towards or away from each other.
  • the clamping groups (11 or 11 ') enable the realization of a very universal clamping clamp. Since the clamping groups (11 and 11 ') are also all removable, the clamping clamp of the embodiment according to FIGS. 1 and 2 can also be redesigned in accordance with the embodiment according to FIG. In addition, since the clamping elements (14, 15) can all be removed from the base plate (17), clamping elements with different surface properties or different shapes can be used.
  • the clamping clamp can automatically grip a whole series of differently shaped workpieces according to one of its embodiments.
  • the types of workpieces that can be gripped by the clamping elements and then clamped between the clamping groups include curved / curved workpieces, T-pieces and workpieces of considerable length that have to be connected end to end.
  • the axes (19) of the clamping elements (14, 15) are arranged eccentrically with respect to the central axis of the elongated holes (16), so that rotation of the clamping elements (14 , 15) is effected. Due to the eccentricity of the axes (19) of the tensioning elements (14, 15), a kind of crankshaft effect is achieved, so that the tensioning elements (14, 15) turn more easily towards one another. Because of the eccentricity, the gap between the is narrowed Clamping elements (14, 15) automatically under the action of force.
  • the contact surfaces of the tensioning elements (14, 15) are facetted, as is particularly emphasized in FIG. 9. This ensures a better fit of the clamping elements (14, 15) on the workpiece being held.
  • the clamping elements (14, 15) are particularly advantageously designed with a softer outer coating (non-slip material) 214 in order to avoid damage to the workpiece.
  • the core 215 of the clamping elements (14, 15) consists of a harder material.
  • the coefficient of friction of the coating (214) is of particular importance, which should have a high value in order to reliably clamp even smooth surfaces.
  • reference numerals serve the sole purpose of increasing the clarity of the claim, and consequently such reference numerals have no restrictive effect on the scope of protection of any feature which is exemplified by such a reference numeral.

Landscapes

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

Abstract

Etrier de serrage (10) comportant une plaque de base (17) et une paire d'éléments de serrage (14, 15), la plaque de base (17) comprenant une paire de trous allongés (16) qui convergent en direction d'une ligne médiane. Chacun des deux éléments de serrage (14, 15) est totalement ou partiellement courbé au niveau de sa surface périphérique. Chaque élément de serrage (14, 15) est guidé dans un des deux trous allongés convergents (16) et orienté de sorte que son axe soit pratiquement perpendiculaire à la plaque de base (17). Les éléments de serrage (14, 15) peuvent coulisser (14, 15) dans chaque trou allongé (16) au moyen d'un coulisseau commun (155). Entre les éléments de serrage (14, 15) se trouvent des éléments ressorts (39) qui sont tendus, lorsque les éléments de serrage (14, 15) coulissent en direction de la divergence des trous allongés (16).
EP97953820A 1996-12-13 1997-12-15 Etrier de serrage avec elements de serrage rotatifs et coulissants Withdrawn EP0946335A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19652057A DE19652057A1 (de) 1996-12-13 1996-12-13 Spannzwinge mit drehbaren und verschiebbaren Spannelementen
DE19652057 1996-12-13
PCT/EP1997/007036 WO1998025732A1 (fr) 1996-12-13 1997-12-15 Etrier de serrage avec elements de serrage rotatifs et coulissants

Publications (1)

Publication Number Publication Date
EP0946335A1 true EP0946335A1 (fr) 1999-10-06

Family

ID=7814714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97953820A Withdrawn EP0946335A1 (fr) 1996-12-13 1997-12-15 Etrier de serrage avec elements de serrage rotatifs et coulissants

Country Status (4)

Country Link
US (1) US6206355B1 (fr)
EP (1) EP0946335A1 (fr)
DE (1) DE19652057A1 (fr)
WO (1) WO1998025732A1 (fr)

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Publication number Priority date Publication date Assignee Title
CA2258287C (fr) * 1997-04-17 2007-09-18 Bessey & Sohn Gmbh & Co. Serre-joints
US6307391B1 (en) * 2000-02-23 2001-10-23 Unisys Corporation Pivoting springy mechanism that opens and closes pressed electrical contacts with a force which is nearly constant over a range of closed positions
US6325662B1 (en) * 2000-02-23 2001-12-04 Unisys Corporation Apparatus for testing IC chips using a sliding springy mechanism which exerts a nearly constant force apparatus
AT410297B (de) * 2000-12-19 2003-03-25 Schluesselbauer Johann Ing Vorrichtung zum abziehen eines formringes
US20050280196A1 (en) * 2004-06-22 2005-12-22 Ray Avalani Bianca R Bar clamp with multi-directional adjustable pads
WO2007001486A2 (fr) * 2005-01-19 2007-01-04 Tosoh Smd Etna, Llc End effector for handling sputtering targets
US20080000853A1 (en) * 2006-06-13 2008-01-03 Jung Li Huang Holder for implements
CN101650464B (zh) * 2008-08-14 2012-06-20 鸿富锦精密工业（深圳）有限公司 组装装置
TWM366409U (en) * 2009-06-10 2009-10-11 you-bo Zhu Clamp for removing universal joint of shock absorber in remote control car
US8517362B1 (en) * 2012-04-02 2013-08-27 Leon Monroe Pittman Fletching jig and method for fletching an arrow
KR20180045855A (ko) * 2015-08-28 2018-05-04 마쿠에트 게엠베하 수술대에 액세서리를 고정하기 위한 디바이스
USD886819S1 (en) * 2018-04-19 2020-06-09 Compal Electronics, Inc. Notebook computer
US11660716B2 (en) 2020-06-04 2023-05-30 Goodrich Corporation Systems and methods for multi-hole assemblies with angular adjustment and locking
CN115182507A (zh) * 2022-07-25 2022-10-14 国网浙江省电力有限公司嘉兴供电公司 一种适用于预制装配式变电站结构的pbl连接件贯穿钢筋联肢定位装置及其实施方法
CN117554167B (zh) * 2023-11-13 2024-05-10 优正(广州)检测股份有限公司 一种拉力试验装置及其使用方法

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EP0267982A1 (fr) * 1986-11-18 1988-05-25 Wolfgang Baumann Serre-joint à serrage par vis
DE8800392U1 (de) * 1987-01-23 1988-03-03 Gross + Froelich GmbH & Co, 7000 Stuttgart Vorrichtung zum Spannen von senkrecht zueinander verlaufenden Werkstücken
DE3733605A1 (de) * 1987-10-05 1989-04-13 Gaggenau Werke Hilfswerkzeug zum gegenseitigen verspannen von aneinanderstossenden platten
AT391830B (de) * 1987-12-23 1990-12-10 Zimmermann Gabriel Zwinge zum festhalten und anpressen von umleimern an tafelfoermigen werkstuecken
DE8807182U1 (de) * 1988-06-01 1988-08-18 Brüne, Kurt, 3501 Guxhagen Schraubzwinge
WO1991012114A1 (fr) * 1990-02-09 1991-08-22 Wilfried Lichtenberg Serre-joint avec machoires pivotantes et coulissantes
GB2254282A (en) * 1991-04-04 1992-10-07 Scapa Group Plc Gripper device for mounting felts and fabrics in papermaking and like machine

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
DE19652057A1 (de) 1998-06-18
WO1998025732A1 (fr) 1998-06-18
US6206355B1 (en) 2001-03-27

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