EP2181806A2 - Dispositif de serrage - Google Patents

Dispositif de serrage Download PDF

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Publication number
EP2181806A2
EP2181806A2 EP20090168160 EP09168160A EP2181806A2 EP 2181806 A2 EP2181806 A2 EP 2181806A2 EP 20090168160 EP20090168160 EP 20090168160 EP 09168160 A EP09168160 A EP 09168160A EP 2181806 A2 EP2181806 A2 EP 2181806A2
Authority
EP
European Patent Office
Prior art keywords
clamping
clamping device
drive means
bolt
arm
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Withdrawn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
EP20090168160
Other languages
German (de)
English (en)
Inventor
Günter HERRMANN
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.)
MBB Fertigungstechnik GmbH
Original Assignee
Claas Fertigungstechnik GmbH
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 Claas Fertigungstechnik GmbH filed Critical Claas Fertigungstechnik GmbH
Publication of EP2181806A2 publication Critical patent/EP2181806A2/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Withdrawn legal-status Critical Current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
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/12—Arrangements for positively actuating jaws using toggle links
    • B25B5/122—Arrangements for positively actuating jaws using toggle links with fluid drive

Definitions

  • the present invention relates to a clamping device for fixing workpieces to be machined.
  • Out DE 203 15 264 U1 is a clamping device with a contact surface for a workpiece, a clamping arm, which is movable between a contact surface adjacent the clamping position and a detached from the contact surface release position, and a bolt known that intervening between a clamped in a contact surface between clamping surface and clamping workpiece and a moved out of the workpiece position is movable.
  • Clamping arm and bolt are coupled to each other via a hand lever driven.
  • a consequence of the coupling of bolt and clamping arm is that if the bolt stuck in the workpiece, and the clamping arm can not be moved. As long as the clamping arm does not move, the clamping of the workpiece between clamping arm and support surface is made, the workpiece can not go crazy, and also between the workpiece and bolt clamping can not be eliminated. Thus, under unfortunate circumstances, it may self-inhibit the Come tensioning device. This problem can easily occur in particular if several clamping devices are used for fixing workpieces to be welded together. During welding, the workpieces are at least locally hot, and in that state they are joined together. Shrinkage of the welded workpiece as it cools creates a tension across the latches of the jigs that can easily block the latches.
  • Object of the present invention is to provide a clamping device of the type mentioned so that a workpiece is also easily and safely removed when the movement of the bolt is blocked or difficult in the disengaged position.
  • the object is achieved by, in a clamping device with a contact surface for a workpiece, a clamping arm which is movable between a contact surface adjacent clamping position and a detached from the contact surface release position, one between an engaging position in the workpiece and one disengaged from the workpiece Position movable latch and a drive means for adjusting the clamping arm and the bolt, which is movable between a first end position in which the clamping arm in the clamping position and the latch in the engaging position, and a second end position in which the clamping arm in the Release position and the latch in the disengaged position are the path of the drive means from the first to the second end position a first portion in which the drive means drives only the tensioning arm and a second portion in which the drive means drives at least the bolt.
  • the latch remains at rest, while the drive means passes through the first portion of the path and thereby removes the clamping arm from the clamping position, a blockage of the clamping device is excluded by a stuck latch.
  • the clamping arm moves away from the clamping position and forms a gap between it and the workpiece, the clamping of the workpiece between clamping arm and bearing surface is canceled.
  • the workpiece can therefore spontaneously perform a movement in the plane of the contact surface, through which the clamping of the bolt is canceled. If the freedom of movement achieved by the lifting of the tensioning arm from the workpiece is not sufficient to release the clamping of the bolt, the gap formed between the workpiece and the clamping arm can also be used to pull the workpiece onto the tensioning arm from the bolt.
  • a sequence of movements in which initially only the clamping arm is raised and the bar is retracted later is particularly easy to implement by a play-containing coupling of the bolt.
  • the length of the first section is preferably variable. This is easily adjustable To achieve play between drive means and bars.
  • the tensioning arm only reaches an intermediate position on the way to its release position.
  • the drive means entrains the clamping arm from the intermediate position to the release position and the latch from the engaging to the disengaged position.
  • a game-containing coupling is expediently also to be provided between the tensioning arm and the drive means.
  • the play between the drive means and bolt is realized by the drive means comprises a longitudinally displaceable in the direction of movement of the bolt rod and a rod movable projection which is spaced in the first portion of the path of a projection of the bolt and in the second portion of the path on this projection is applied.
  • the bolt preferably comprises a parallel to the rod of the drive element displaceable, preferably in ball bearings, guided rod.
  • a double-acting cylinder To drive the movement of clamping arm and bolt in both directions, can be provided as the drive means a double-acting cylinder.
  • a toggle for coupling is expediently provided between the two.
  • the toggle lever When the tensioning arm is in the clamping position, the toggle lever is oriented substantially perpendicular to a direction of movement of the drive means. Thus, a high clamping force of the clamping arm can be generated on the workpiece with a small force of the drive means.
  • the drive means may - alternatively or in addition to the double-acting cylinder - also comprise a hand lever.
  • the hand lever is suitably coupled to a linearly movable element of the drive means with a variable depending on the position of the hand lever gear ratio.
  • the ratio of the distance traveled by the linearly movable member to the pivoting angle of the lever in the first portion greater than in the second, the first portion can be traversed quickly with a small movement of the hand lever, while in the second portion without effort, a high tensile force the bar can be exercised.
  • the bolt can be easily solved even if the force of the cylinder is not sufficient for this purpose.
  • the hand lever may be coupled to the linearly movable element of the drive means via a second toggle lever.
  • the linearly movable element is the double-acting cylinder
  • Fig. 1 shows a schematic section through a clamping device according to a first embodiment of the invention.
  • a housing of the clamping device can be divided into three parts, a base body 1, which is provided with means not shown, known per se for fastening the clamping device to a base such as a workbench, a cylinder housing 2 and a bridge part 3, the base body 1 and Cylinder housing 2 connects to each other.
  • a clamping arm 4 is pivotally articulated about a transverse to the cutting plane of the Fig. 5 extending shaft.
  • the clamping arm 4 is shown in a clamping position in which it holds a workpiece 6 against a bearing surface 7 of the base body 1.
  • the workpiece 6 may be in one piece, but it may also be a plurality of parts, which may be fixed only by the clamping in the clamping device with respect to each other.
  • the bridge part 3 may comprise mutually vertically adjustable and mutually fixable rails, which allow the height of the cylinder housing 2 with respect to the base body 1 and thus the height of the gap between the clamping arm 4 and the support surface 7 to the thickness of the workpiece to be machined 6th adapt.
  • the clamping arm 4 is articulated via a toggle lever 8 to a piston rod 9 which is vertically movable in the cylinder housing 2.
  • the toggle lever 8 In the clamping position of Fig. 1 the toggle lever 8 is aligned at right angles to the piston rod 9, so that the piston rod 9 is not displaced by a force acting on the clamping arm 4 torque.
  • the piston rod 9 crosses a piston 10 which is accommodated in a chamber 11 of the cylinder housing 2.
  • upper and lower sides of the piston 10 can be acted upon by lines and control valves, not shown, optionally with a gaseous or liquid pressure medium.
  • two driving rings 12, 13 are fastened.
  • the driving rings 12, 13 can be detachably and fixably attached to the piston rod 9.
  • a guided in a vertical bore of the base body 1 displaceable rod 14 carries at its upper end a mandrel 15 which engages in a recess of the workpiece 6 and the workpiece 6 thereby locked positively in position.
  • An angled at a lower end of the rod 14 arm 16 has at its free end a bore through which the piston rod 9 extends, and is displaceable downwards or upwards by contact with one of the driving rings 12, 13. Since, in the case of contact, the contact surface between the driving ring 12 or 13 and the arm 16 extends annularly and symmetrically around the piston rod 9, the torques of forces acting on opposite sides of the rod 9 on the driving ring 12 mutually compensate each other. Thus, the piston rod 9 is not exposed to torque, and there is no danger that these tilted.
  • a play and low-friction guidance of the rod 14 may be provided in the base body 1, for example by linear ball bearings 23 or the like, which surround the rod at the top and bottom of the base body.
  • the top of the piston 10 is pressurized with pressurized fluid.
  • the piston 10 and the piston rod 9 move downward, and the clamping arm 4 is pulled over the toggle lever 8, as in Fig. 2 shown.
  • the arm 16 is spaced from both driving rings 12, 13 and does not follow the movement of the piston rod 9. It results in the Fig. 2 shown configuration in which the clamping arm 4 is moved away from the top of the workpiece 6, the mandrel 15 is still fully inserted into the workpiece 6.
  • the clamping between clamping arm 4 and 7 edition is indeed canceled, yet can the workpiece 6 still stuck on the support 7, if due to an internal stress of the workpiece 6 this presses strongly against the mandrel 15 from the side.
  • the piston 10 After placing a new workpiece 6, the piston 10 is pressurized from below with pressure fluid, the piston rod 9 moves back up, and the clamping arm 4 lowers against the workpiece 6. In the course of this movement comes as in Fig. 4 shown, the lower driving ring 13 in contact with the arm 16 and pushes it upwards, whereby the mandrel 15 engages in the workpiece 6 again. Since the toggle lever 8 is aligned almost perpendicular to the end of the upward movement of the piston rod 9, almost the entire force of the piston 10 is available to push the mandrel 15 into the recess of the workpiece 6 into it.
  • a hand lever 18 is articulated in an upper region of the cylinder housing 2 and connected to the piston rod 9 via a knee lever 19.
  • the hand lever 18 is driven by the piston 10 driven via the movement of the piston rod 9 and pivots between the in FIGS. 5 and 6 shown positions. If, when opening the clamping device, the upper driving ring 12 strikes the arm 16, the hand lever 18 is aligned approximately horizontally. If at this stage the force of the piston 10 is insufficient to pull the mandrel 15 out of the workpiece, it can be helped by hand by pressing the hand lever 18.
  • the pivot axis 20 of the hand lever 18 and hinge axes 21, 22 of the toggle lever 19 are arranged so that they form an increasingly elongated triangle with increasing approach to the lower end position of the piston rod 9.
  • the axes 20, 21, 22 are almost, but not exactly in a plane.
  • An extremely low gear ratio between the movement of the hand lever 18 and the mandrel 15 is achieved, so that a very high tensile force can be exerted on the mandrel 15 with little force on the hand lever 18.
  • An exactly linear arrangement of the pivot axes 20, 21, 22 should not be achieved because in such a case the Knee lever 19 would block the piston rod 9 in the lower end position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
EP20090168160 2008-10-31 2009-08-19 Dispositif de serrage Withdrawn EP2181806A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008054195A DE102008054195A1 (de) 2008-10-31 2008-10-31 Spannvorrichtung

Publications (1)

Publication Number Publication Date
EP2181806A2 true EP2181806A2 (fr) 2010-05-05

Family

ID=41600587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090168160 Withdrawn EP2181806A2 (fr) 2008-10-31 2009-08-19 Dispositif de serrage

Country Status (2)

Country Link
EP (1) EP2181806A2 (fr)
DE (1) DE102008054195A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015125841A1 (fr) * 2014-02-24 2015-08-27 Smc Corporation Appareil de serrage
JP2015196220A (ja) * 2014-04-01 2015-11-09 Smc株式会社 クランプ装置
CN107855967A (zh) * 2017-12-23 2018-03-30 安徽航大智能科技有限公司 一种浮动式平面定位平台
CN114800327A (zh) * 2022-05-27 2022-07-29 苏州诚拓智能装备有限公司 一种载具上应用的自锁装置及载具组件

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20315264U1 (de) 2003-10-04 2005-02-17 Staudinger Forschungs- Und Entwicklungs Gmbh & Co. Kg Spannvorrichtung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4223880A (en) * 1978-06-23 1980-09-23 Brems John Henry Work clamp and pallet combination
DE4036656C1 (en) * 1990-11-18 1992-03-05 Tuenkers Maschinenbau Gmbh, 4030 Ratingen, De Vehicle bodywork panel mfr. - involves toggle-action punch working onto die

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20315264U1 (de) 2003-10-04 2005-02-17 Staudinger Forschungs- Und Entwicklungs Gmbh & Co. Kg Spannvorrichtung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015125841A1 (fr) * 2014-02-24 2015-08-27 Smc Corporation Appareil de serrage
JP2015196220A (ja) * 2014-04-01 2015-11-09 Smc株式会社 クランプ装置
CN107855967A (zh) * 2017-12-23 2018-03-30 安徽航大智能科技有限公司 一种浮动式平面定位平台
CN107855967B (zh) * 2017-12-23 2024-02-06 安徽航大智能科技有限公司 一种浮动式平面定位平台
CN114800327A (zh) * 2022-05-27 2022-07-29 苏州诚拓智能装备有限公司 一种载具上应用的自锁装置及载具组件
CN114800327B (zh) * 2022-05-27 2022-10-04 苏州诚拓智能装备有限公司 一种载具上应用的自锁装置及载具组件

Also Published As

Publication number Publication date
DE102008054195A1 (de) 2010-05-06

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