EP0215326A2 - Clamping device - Google Patents

Clamping device Download PDF

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Publication number
EP0215326A2
EP0215326A2 EP86111577A EP86111577A EP0215326A2 EP 0215326 A2 EP0215326 A2 EP 0215326A2 EP 86111577 A EP86111577 A EP 86111577A EP 86111577 A EP86111577 A EP 86111577A EP 0215326 A2 EP0215326 A2 EP 0215326A2
Authority
EP
European Patent Office
Prior art keywords
leg
tie rod
clamping
clamping jaw
housing
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.)
Granted
Application number
EP86111577A
Other languages
German (de)
French (fr)
Other versions
EP0215326B1 (en
EP0215326A3 (en
Inventor
Werner Heine
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.)
Georg Kesel GmbH and Co KG
Original Assignee
Georg Kesel GmbH and Co KG
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 Georg Kesel GmbH and Co KG filed Critical Georg Kesel GmbH and Co KG
Priority to AT86111577T priority Critical patent/ATE69190T1/en
Publication of EP0215326A2 publication Critical patent/EP0215326A2/en
Publication of EP0215326A3 publication Critical patent/EP0215326A3/en
Application granted granted Critical
Publication of EP0215326B1 publication Critical patent/EP0215326B1/en
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
    • B25B1/06—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
    • 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
    • B25B1/12—Arrangements for positively actuating jaws using screws with provision for disengagement
    • 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

Definitions

  • the invention relates to a clamping device, in particular precision high-pressure clamps, with a housing, a clamping jaw fixed to the housing, a separate, approximately U-shaped tie rod arranged in the housing, one leg of which engages behind the fixed clamping jaw and the other leg forms a threaded nut penetrated by a screw spindle , wherein one end of the screw spindle engages behind a displaceable clamping jaw and the clamping surfaces of both clamping jaws are parallel.
  • Such a tensioning device is known from DE-PS 30 00 162.
  • the upper part of the front surface of one U-leg lies in a plane parallel to the clamping surface.
  • the rear surface of the fixed jaw is also flat in this area. With these two flat surfaces, one leg of the tie rod and the fixed clamping jaw touch each other. In this area, the tie rod is screwed to the fixed jaw using two screws.
  • the housing can be relieved to a certain extent of deformation forces with this known clamping device, the fixed clamping jaw becomes high due to the rigid connection with one leg of the tie rod Clamping forces are still slightly tilted, so that precision machining is only imperfectly possible.
  • a tensioning device of the type mentioned is also known, in which the one leg of the tie rod has a cross pin protruding from this on both sides.
  • the protruding bolt ends are accommodated in the bearing recesses of the fixed clamping jaw, the recess radius being the same as the radius of the bolt ends.
  • the bolt ends therefore lie flat against the inner surfaces of the bearing troughs. Thanks to the swivel connection achieved between one leg of the tie rod and the fixed clamping jaw, no more tilting moment is transmitted to the latter.
  • the disadvantage is that the entire clamping force has to be absorbed by the protruding bolt ends, which leads to a bolt deformation at high clamping forces and thus to damage to the clamping device.
  • Another disadvantage is that an extremely precise production would be required so that both pin ends bear evenly. In practice, this is only possible with extraordinary processing effort. This proposal is also unsuitable for high pressure vices.
  • the object of the invention is to design a tensioning device of the type mentioned at the outset in such a way that it is low Costs can be produced, is suitable for high clamping forces, deformation of the housing or its fixed clamping jaw is absolutely prevented and even off-center clamping with high clamping force is permitted.
  • the tensioning device is to be designed in such a way that a desired tensioning force can be controlled by manual operation.
  • This output is achieved in a tensioning device of the type mentioned in the introduction that between the one leg of the tie rod and the fixed clamping jaw there is an approximately linear contact which extends over at least the major part of the leg width and that the tie rod is self-adjusting suspended in the housing in such a floating manner that it can be pivoted to a limited extent about an imaginary axis that crosses the contact line between the one leg and the fixed clamping jaw on the one hand and the housing bottom surface on the other hand.
  • the tie rod can also be moved in all directions in a plane parallel to the clamping surface and also to a limited extent at right angles to it.
  • the essence of the invention is that the area of the power transmission zone between the one Leg of the tie rod and the fixed clamping jaw on the one hand and the holding means for the tie rod in the housing are separated from one another.
  • the holding means ensure all-round mobility of the tie rod in the housing, with the success that the tie rod aligns itself automatically in all clamping positions and does not exert any deformation forces on the fixed clamping jaw. Despite savings in manufacturing costs, better parallelism of the clamping surfaces is ensured even with high clamping forces and even when workpieces are clamped off-center.
  • one leg of the tie rod in the region of the contact line has a nose which is convexly rounded in cross section, and that a space gap extending up to the yoke of the tie rod is formed adjacent to the nose between the one leg and the fixed clamping jaw.
  • the rounded nose of one leg of the tie rod is comparatively easy to manufacture.
  • the counter surface of the fixed jaw is also easy to produce as a flat surface. The correct positioning of the tie rod in such a way that the nose evenly touches the fixed clamping jaw over the entire width of the nose does not require special attention be given, because thanks to the floating mounting of the tie rod, self-adjustment takes place during operation.
  • the front surface of one leg of the tie rod can also be flat, e.g. lies in a plane parallel to the clamping surface if a corresponding nose-like projection is provided on the rear surface of the fixed clamping jaw, which projection forms the contact line with one leg of the tie rod.
  • the floating mounting of the tie rod can be achieved according to a further development of the invention in that an approximately trough-like recess is provided in each of the two side surfaces of one leg, in which spring-mounted, transversely aligned bolts engage in the fixed clamping jaw. These bolts ensure a certain amount of displacement play in the trough-like recesses, so that the tie rod can move in all directions parallel to the clamping surface but also at an angle to it and can pivot not only about the contact line but also perpendicular to it.
  • a third alternative to the floating mounting of the tie rod is that elastically deformable connecting means are provided between the tie rod and the housing, preferably in such a way that the gaps formed between the tie rod and the housing are poured out by an elastic mass.
  • the tie rod is permanently connected to the housing. Removing the tie rod is also possible no longer necessary, since the gaps are poured out elastically, so that no metal chips and other contaminants could enter there.
  • a very favorable solution for this is that a gap is formed between part of the front surface of one leg of the tie rod and the rear surface of the fixed clamping jaw facing this, and that a pressure indicator device is installed in one leg of the tie rod has a movable take-off member that passes through the gap and rests on the fixed jaw.
  • the pressure indicator preferably comprises an indicator disc with a pointer.
  • the fixed clamping jaw has an upper wall which overlaps one leg of the tie rod and is provided with a viewing window, below which the indicator disc is located. Since the tie rod is deformed in accordance with the tension force and in such a way that one leg of the tie rod is inclined with increasing tension force the gap width between the leg and the fixed jaw is reduced. The removal link is shifted accordingly and this shift is indicated by turning the pointer.
  • the indicator disc preferably has colored fields, so that it can be seen at a glance whether the instantaneous clamping force is in the desired range.
  • the pressure detection device comprises an electrical switch which responds to a certain deformation of the tie rod and closes the circuit of a processing machine.
  • the switch is preferably arranged to be adjustable with a movement component in the clamping direction. If a workpiece is not properly clamped due to carelessness, conventional clamping devices can damage very valuable processing machines. The invention prevents this because as long as an adjustable minimum clamping pressure is not achieved, the processing machine cannot be started. As soon as the minimum clamping pressure has been reached, the switch responds and closes the circuit of the processing machine, for example via ultra-sound or infrared remote transmission.
  • U-shaped tie rod 16 which has a first leg 18, a yoke 20 extending along the vise and a second leg 22 which has a threaded nut for a screw spindle 24 forms, one end of which engages behind a movable clamping jaw 26 which is displaceably guided on the housing 12 in longitudinal rails, is characterized in that the tie rod 16 is floatingly supported in the housing 12 by means of a three-point suspension is.
  • the tie rod 16 with the two legs 18, 22 and the yoke 20 could form a one-piece component.
  • the other leg 22 on the yoke 20 of the tie rod 16 is arranged so that it can be adjusted in stages by means of plug pins 28.
  • the tie rod leg 18 has a trough-like depression 30 on each of its two side surfaces.
  • the two depressions 30 are aligned transversely.
  • the side walls of the fixed clamping jaw 14 have coaxial transverse bores 32, in each of which a locking bolt 34, a compression spring 36 and a threaded piece 38 are located.
  • the threaded pieces 38 are screwed so far into the transverse bores 32 that the locking bolts 34 penetrate the trough-like recesses 30 of the tie rod leg 18 with a certain preload.
  • the latching bolts 34 and the depressions 30 are designed with respect to one another such that a relative displacement in all directions parallel to the side surfaces of the leg 18 is possible.
  • the trough-like depressions 30 are, for example, conical, while the front surfaces of the locking bolts 34 are hemispherical.
  • the springs 36 seek to adjust the tie rod 16 so that the transverse axis containing the centers of the trough-like depressions 30 is aligned with the transverse axis of the bores 32 collapses.
  • the upper end of the left leg 18 facing the clamping zone is designed in the form of a nose 40 which is rounded in cross section.
  • the nose 40 is adjoined by an oblique flat front surface 42 of the leg 18, which encloses an angle of approximately 5 ° with a plane 44 parallel to the clamping surface.
  • the rear surface 46 (FIG. 8) of the fixed clamping jaw 14 lies in the clamped state in the plane designated 44, so that a gap 48 forms below the nose 40, which gradually widens towards the yoke 20 of the tie rod 16.
  • the leg 18 of the tie rod 16 is made of solid material.
  • the yoke 20, however, has a U-shaped cross section, in which the other leg 22 engages.
  • the cross-sectional contour of the leg 18 is the same over the entire tie rod width.
  • the trough-like depressions 30 in the leg 18 and the bores 32 in the fixed clamping jaw 14 are arranged such that the nose 40 roughly touches the rear surface 46 of the fixed clamping jaw with mutual transverse alignment.
  • the tie rod 16 automatically aligns itself with the Art that the locking pin 34 shift in the trough-like recesses 30 such that a continuous contact of the nose 40 on the rear surface 46 of the fixed jaw 14 takes place theoretically along a line of contact.
  • the tie rod deforms and the nose 40 rolls on the rear surface 46, but line contact is still retained.
  • FIG. 5 illustrates an alternative to the floating mounting of the tie rod leg 18.
  • the side walls of the fixed clamping jaw 14 have transversely aligned bores 50, into which elastically deformable sleeves 52 are inserted.
  • the leg 18 has a coaxial bore with an inner diameter equal to that of the elastic sleeves 52.
  • a plug pin 54 passes through the bore of the leg 18 and the elastic sleeves 52.
  • FIGURES 6 and 7 illustrate a third alternative to the floating mounting of the tie rod 16.
  • the tie rod 16 is connected to the housing 12 on the bottom side and on both side surfaces over its entire length by means of elastic layers 56, 58. I.e. the gaps formed between tie rod 16 and housing are filled with elastic material.
  • the elastic material ensures a self-adjustment of the tie rod 16 during the tensioning process and at the same time prevents metal chips from penetrating into the gaps. An additional mechanical mounting of the tie rod 16 on the housing 12 is thus eliminated.
  • a so-called commercially available pressure cell 60 is installed in the leg 18 of the tie rod 12, which has an indicator disc 66, which is located under a viewing window 62 in an upper wall 64 of the fixed clamping jaw 14 covering the leg 18, and has a pressure pin 68, which penetrates the gap 48 between the mutually facing surfaces 42 and 46 of the leg 18 or the fixed clamping jaw 14 and abuts the rear surface 46 of the fixed clamping jaw 14.
  • the leg 18 pivots to the left relative to the yoke 20 of the tie rod 16, as a result of which the width of the gap 48 is reduced.
  • the pin 68 thereby moves into the interior of the display device 60. This inward movement of the pin 68 is converted by a built-in gear into a rotation of a pointer 70 playing above the display disk 66.
  • an electrical switch 72 is inserted in the leg 18 of the tie rod 16, the function of its movable switching pin 74 corresponds to that of the pin 68 of the display device 60.
  • the two power cables 76 are in the control circuit for starting a processing machine or are connected to a transmitter which controls a corresponding receiver of the processing machine.
  • the switch 72 is open below a certain clamping force. When the clamping force is increased, the tie rod 16 deforms. The width of the gap 48 decreases and the switch 72 closes, as a result of which the processing machine circuit is activated. Damage to the processing machine due to an insufficiently clamped workpiece is therefore excluded.
  • the response level of the switch 72 can be adjusted in that a threaded ring 80 is attached to the sleeve 78 or is formed integrally therewith.
  • the threaded ring 80 can be screwed into a corresponding threaded section of the receiving bore for the sleeve 78.
  • a transverse fixing screw 82 secures the switch sleeve 78 in the desired position.
  • the response level of the switch 72 is preselected by screwing the collar sleeve 78 using spacers 84.
  • the fixation is in turn carried out by the setscrew 82.

Abstract

At a base of a vise a U-shaped tie element is floatingly mounted in such way that a front leg portion thereof abuts aginst the rear inner face of a stationary clamping jaw. The area of contact between the front leg portion and the clamping jaw comprises the combination of a convex nose at the one part and a planar face at the other part. The tie element is supported by resilient means which are separated from the contact area. Thereby the tie element is self-adjusting and a uniform contact is gained along the whole width of the tie element. During clamping the front leg portion is pivoted with respect to the base section of the tie element, however, thanks to a rolling line contact at the stationary clamping jaw no forces are transmitted which would angularly displace the stationary clamping jaw.

Description

Die Erfindung betrifft ein Spanngerät, insbesondere Präzisions-Hochdruckspanner, mit einem Gehäuse, einer gehäusefesten Spannbacke, einem im Gehäuse angeordne­ten separaten , etwa U-förmigen Zuganker, dessen einer Schenkel die feste Spannbacke hintergreift und des­sen anderer Schenkel eine, von einer Schraubspindel durchsetzte Gewindemutter bildet, wobei das eine Ende der Schraubspindel eine verschiebbare Spannbacke hin­tergreift und die Spannflächen beider Spannbacken pa­rallel liegen.The invention relates to a clamping device, in particular precision high-pressure clamps, with a housing, a clamping jaw fixed to the housing, a separate, approximately U-shaped tie rod arranged in the housing, one leg of which engages behind the fixed clamping jaw and the other leg forms a threaded nut penetrated by a screw spindle , wherein one end of the screw spindle engages behind a displaceable clamping jaw and the clamping surfaces of both clamping jaws are parallel.

Ein derartiges Spanngerät ist aus der DE-PS 30 00 162 bekannt. Der obere Teil der Vorderfläche des einen U-Schenkels liegt in einer zur Spannfläche parallelen Ebene. Die Hinterfläche der festen Spannbacke ist in diesem Bereich ebenfalls eben ausgebildet. Mit diesen beiden ebenen Flächen berühren der eine Schenkel des Zugankers und die feste Spannbacke einander. In die­sem Bereich ist der Zuganker mittels zweier Schrauben an der festen Spannbacke festgeschraubt. Zwar kann mit diesem bekannten Spanngerät das Gehäuse in gewissem Maß von Verformungskräften entlastet werden, jedoch wird die feste Spannbacke wegen der starren Verbin­dung mit dem einen Schenkel des Zugankers bei hohen Spannkräften immer noch etwas gekippt, sodaß eine Präzisionsbearbeitung nur unvollkommen möglich ist.Such a tensioning device is known from DE-PS 30 00 162. The upper part of the front surface of one U-leg lies in a plane parallel to the clamping surface. The rear surface of the fixed jaw is also flat in this area. With these two flat surfaces, one leg of the tie rod and the fixed clamping jaw touch each other. In this area, the tie rod is screwed to the fixed jaw using two screws. Although the housing can be relieved to a certain extent of deformation forces with this known clamping device, the fixed clamping jaw becomes high due to the rigid connection with one leg of the tie rod Clamping forces are still slightly tilted, so that precision machining is only imperfectly possible.

Aus der US-PS 28 82 656 ist ebenfalls ein Spannge­rät der eingangs genannten Art bekannt, bei dem der eine Schenkel des Zugankers einen beidseitig aus die­sem herausragenden Querbolzen aufweist. Die herausra­genden Bolzenenden sind in Lagermulden der festen Spann­backe aufgenommen, wobei der Muldenradius mit dem Ra­dius der Bolzenenden übereinstimmt. Die Bolzenenden liegen also flächig an den Innenflächen der Lagermul­den an. Dank der erzielten Schwenkverbindung zwischen dem einen Schenkel des Zugankers und der festen Spann­backe wird auf letztere kein Kippmoment mehr übertra­gen. Der Nachteil besteht jedoch darin, daß die gesam­te Spannkraft von den vorstehenden Bolzenenden aufge­nommen werden muß, was bei hohen Spannkräften zu einer Bolzenverformung und damit zu einer Beschädigung des Spanngerätes führt. Weiterhin ist nachteilig, daß ei­ne außerordentlich präzise Herstellung erforderlich wäre, damit beide Bolzenenden gleichmäßig tragen. In der Praxis ist dies nur mit außerordentlichem Bear­beitungsaufwand möglich. Für Hochdruckspanner ist auch dieser Vorschlag nicht geeignet.From US-PS 28 82 656 a tensioning device of the type mentioned is also known, in which the one leg of the tie rod has a cross pin protruding from this on both sides. The protruding bolt ends are accommodated in the bearing recesses of the fixed clamping jaw, the recess radius being the same as the radius of the bolt ends. The bolt ends therefore lie flat against the inner surfaces of the bearing troughs. Thanks to the swivel connection achieved between one leg of the tie rod and the fixed clamping jaw, no more tilting moment is transmitted to the latter. The disadvantage, however, is that the entire clamping force has to be absorbed by the protruding bolt ends, which leads to a bolt deformation at high clamping forces and thus to damage to the clamping device. Another disadvantage is that an extremely precise production would be required so that both pin ends bear evenly. In practice, this is only possible with extraordinary processing effort. This proposal is also unsuitable for high pressure vices.

Aufgabe der Erfindung ist es, ein Spanngerät der ein­gangs genannten Art so auszubilden, daß es mit geringen Kosten herstellbar ist, für hohe Spannkräfte geeig­net ist, eine Verformung des Gehäuses bzw. dessen fester Spannbacke absolut unterbindet und sogar ein außermittiges Spannen mit hoher Spannkraft er­laubt.The object of the invention is to design a tensioning device of the type mentioned at the outset in such a way that it is low Costs can be produced, is suitable for high clamping forces, deformation of the housing or its fixed clamping jaw is absolutely prevented and even off-center clamping with high clamping force is permitted.

Gemäß einem weiteren Aspekt soll das Spanngerät so ausgebildet werden, daß bei Handbetätigung eine ge­wünschte Spannkraft kontrollierbar ist.According to a further aspect, the tensioning device is to be designed in such a way that a desired tensioning force can be controlled by manual operation.

Diese Ausgabe wird bei einem Spanngerät der eingangs genannten Art dadurch gelöst, daß zwischen dem einen Schenkel des Zugankers und der festen Spannbacke ein sich über mindestens den größten Teil der Schenkelbrei­te erstreckender angenähert linienförmiger Kontakt besteht und daß der Zuganker sich selbsteinstellend im Gehäuse derart schwimmend aufgehängt ist, daß er um eine, die Kontaktlinie zwischen dem einen Schenkel und der festen Spannbacke einerseits und die Gehäuse­bodenfläche andererseits rechtwinklig kreuzende imagi­näre Achse begrenzt schwenkbar ist. Darüberhinaus ist der Zuganker auch in allen Richtungen in einer zu Spann­fläche parallelen Ebene und auch rechtwinklig dazu be­grenzt verschiebbar.This output is achieved in a tensioning device of the type mentioned in the introduction that between the one leg of the tie rod and the fixed clamping jaw there is an approximately linear contact which extends over at least the major part of the leg width and that the tie rod is self-adjusting suspended in the housing in such a floating manner that it can be pivoted to a limited extent about an imaginary axis that crosses the contact line between the one leg and the fixed clamping jaw on the one hand and the housing bottom surface on the other hand. In addition, the tie rod can also be moved in all directions in a plane parallel to the clamping surface and also to a limited extent at right angles to it.

Die Erfindung besteht in ihrem Wesen darin, daß der Bereich der Kraftübertragungszone zwischen dem einen Schenkel des Zugankers und der festens Spannbacke einerseits und die Haltemittel für den Zuganker im Gehäuse voneinander getrennt sind. Die Haltemit­tel gewährleisten eine allseitige Beweglichkeit des Zugankers im Gehäuse, mit dem Erfolg, daß der Zug­anker sich bei allen Einspannstellungen selbsttä­tig ausrichtet und keinerlei Verformungskräfte auf die feste Spannbacke ausübt. Trotz Einsparung an Herstellungskosten wird eine bessere Parallelität der Spannflächen auch bei hohen Spannkräften und sogar dann sicher gestellt, wenn Werkstücke außer­mittig eingespannt werden.The essence of the invention is that the area of the power transmission zone between the one Leg of the tie rod and the fixed clamping jaw on the one hand and the holding means for the tie rod in the housing are separated from one another. The holding means ensure all-round mobility of the tie rod in the housing, with the success that the tie rod aligns itself automatically in all clamping positions and does not exert any deformation forces on the fixed clamping jaw. Despite savings in manufacturing costs, better parallelism of the clamping surfaces is ensured even with high clamping forces and even when workpieces are clamped off-center.

Eine Ausgestaltung der Erfindung besteht darin, daß der eine Schenkel des Zugankers im Bereich der Kontaktlinie eine im Querschnitt konvex ge­rundete Nase aufweist, und daß angrenzend an die Nase zwischen dem einen Schenkel und der festen Spannbacke ein bis zum Joch des Zugankers reichen­der Freiraumspalt gebildet ist. Die gerundete Nase des einen Schenkels des Zugankers ist vergleichs­weise einfach herzustellen. Die Gegenfläche der festen Spannbacke ist als ebene Fläche ebenfalls leicht herstellbar. Der richtigen Positionierung des Zugankers derart, daß die Nase die feste Spann­backe über die ganzen Nasenbreite gleichmäßig be­rührt, muß keine besondere Aufmerksamkeit ge­ schenkt werden, da dank der schwimmenden Lagerung des Zugankers im Betrieb eine Selbsteinstellung erfolgt.One embodiment of the invention is that one leg of the tie rod in the region of the contact line has a nose which is convexly rounded in cross section, and that a space gap extending up to the yoke of the tie rod is formed adjacent to the nose between the one leg and the fixed clamping jaw. The rounded nose of one leg of the tie rod is comparatively easy to manufacture. The counter surface of the fixed jaw is also easy to produce as a flat surface. The correct positioning of the tie rod in such a way that the nose evenly touches the fixed clamping jaw over the entire width of the nose does not require special attention be given, because thanks to the floating mounting of the tie rod, self-adjustment takes place during operation.

Es versteht sich, daß die Vorderfläche des einen Schenkels des Zugankers auch eben ausgebildet sein kann, also z.B. in einer zur Spannfläche parallelen Ebene liegt, wenn an der Rückfläche der festen Spann­backe ein entsprechender nasenartiger Vorsprung vor­gesehen wird, der die Kontaktlinie mit dem einen Schenkel des Zugankers bildet.It goes without saying that the front surface of one leg of the tie rod can also be flat, e.g. lies in a plane parallel to the clamping surface if a corresponding nose-like projection is provided on the rear surface of the fixed clamping jaw, which projection forms the contact line with one leg of the tie rod.

Die schwimmende Lagerung des Zugankers kann gemäß einer Weiterbildung der Erfindung dadurch erreicht werden, daß in beiden Seitenflächen des einen Schen­kels jeweils eine etwa muldenartige Ausnehmung vor­gesehen ist, in die, in der festen Spannbacke federnd gelagerte querausgerichtete Bolzen eingreifen. Diese Bolzen gewährleisten in den muldenartigen Ausnehmungen ein gewisses Verlagerungsspiel, sodaß sich der Zugan­ker in allen Richtungen parallel zur Spannfläche aber auch im Winkel dazu verschieben kann und nicht nur um die Kontaktlinie sondern auch senkrecht dazu verschwen­ken kann. Alternativ ist vorgesehen, daß mit dem einen Schenkel beidseitig vorspringende koaxiale Bolzenenden in Verbindung stehen, die mittels im Schenkel und/­oder in der festen Spannbacke vorgesehenen verformba­ ren Lagermitteln, insbesondere elastisch verform­baren Hülsen gehaltert sind. Diese Lagermittel über­tragen im Betrieb keinerlei Spannkräfte, sondern dienen lediglich der Aufhängung des Zugankers. Ge­mäß beider alternativer Lösungen ist eine schnelle Herausnahme des Zugankers aus dem Gehäuse gewähr­leistet. Im ersten Fall können Gewindestücke, an denen sich die Federn für die Rastbolzen abstützen verschraubt werden, sodaß die Rastbolzen aus den muldenartigen Ausnehmungen heraustreten können. Da die Federvorspannung nur gering ist, genügt sogar die Anwendung eines axialen Druckes auf den Zuganker, um die Bolzen aus den muldenartigen Ausnehmungen aus­rasten zu lassen. Gemäß zweiter Alternative braucht lediglich der vorzugsweise als Steckbolzen ausgebilde­te Bolzen seitlich herausgeschoben zu werden, wobei die Gummihülsen in den Seitenwänden der festen Spann­backe verbleiben.The floating mounting of the tie rod can be achieved according to a further development of the invention in that an approximately trough-like recess is provided in each of the two side surfaces of one leg, in which spring-mounted, transversely aligned bolts engage in the fixed clamping jaw. These bolts ensure a certain amount of displacement play in the trough-like recesses, so that the tie rod can move in all directions parallel to the clamping surface but also at an angle to it and can pivot not only about the contact line but also perpendicular to it. Alternatively, it is provided that with one leg projecting on both sides projecting coaxial bolt ends are connected, which can be deformed by means provided in the leg and / or in the fixed clamping jaw Ren storage means, in particular elastically deformable sleeves are held. These bearing means do not transmit any clamping forces during operation, but only serve to suspend the tie rod. According to both alternative solutions, a quick removal of the tie rod from the housing is guaranteed. In the first case, threaded pieces on which the springs for the locking bolts are supported can be screwed so that the locking bolts can emerge from the trough-like recesses. Since the spring preload is only slight, the application of an axial pressure on the tie rod is sufficient to disengage the bolts from the trough-like recesses. According to the second alternative, only the pin, which is preferably designed as a plug pin, needs to be pushed out laterally, the rubber sleeves remaining in the side walls of the fixed clamping jaw.

Eine dritte Alternative zur schwimmenden Lagerung des Zugankers besteht darin, daß zwischen dem Zuganker und dem Gehäuse elastisch deformierbare Verbindungs­mittel vorgesehen sind und zwar vorzugsweise derart, daß die zwischen Zuganker und Gehäuse gebildeten Spal­ten durch eine elastische Masse ausgegossen sind. In diesem Fall ist der Zuganker mit dem Gehäuse unlösbar verbunden. Eine Herausnahme des Zugankers ist aber auch nicht mehr nötig, da die Spalten elastisch ausge­gossen sind, sodaß keine Metallspäne und sonstige Verunreinigungen dort eintreten könnten.A third alternative to the floating mounting of the tie rod is that elastically deformable connecting means are provided between the tie rod and the housing, preferably in such a way that the gaps formed between the tie rod and the housing are poured out by an elastic mass. In this case the tie rod is permanently connected to the housing. Removing the tie rod is also possible no longer necessary, since the gaps are poured out elastically, so that no metal chips and other contaminants could enter there.

Da bei Hochdruckspannern aufgrund des eingebauten Kraftverstärkers mit geringer Handkraft hohe Spann­kräfte in der Größenordnung von etwa 8t erzielt wer­den können, ist es vorteilhaft, zu wissen, wann eine Mindestspannkraft und/oder eine gewünschte maximale Spannkraft vorhanden ist. Bei einem Spanngerät mit separatem Zuganker besteht dafür eine sehr günstige Lösung darin, daß zwischen einem Teil der Vorderflä­che des einen Schenkels des Zugankers und der dieser zugewandten Hinterfläche der festen Spannbacke ein Spalt gebildet ist und daß im einen Schenkel des Zug­ankers eine Druckmeldeeinrichtung eingebaut ist, die ein bewegliches Abnahmeglied aufweist, das den Spalt durchsetzt und an der festen Spannbacke anliegt. Die Druckmeldeeinrichtung umfaßt vorzugsweise eine Anzei­gescheibe mit Zeiger. Die feste Spannbacke hat eine den einen Schenkel des Zugankers überlappende Ober­wand, die mit einem Sichtfenster versehen ist, un­terhalb dessen sich die Anzeigescheibe befindet. Da sich der Zuganker entsprechend der Spannkraft verformt und zwar derart, daß sich der eine Schen­kel des Zugankers mit zunehmender Spannkraft schräg stellt, verkleinert sich die Spaltbreite zwischen Schenkel und fester Spannbacke. Das Abnahmeglied wird entsprechend verlagert und diese Verlagerung wird durch Verdrehung des Zeigers angezeigt. Die Anzeigescheibe hat vorzugsweise farbige Felder, so­daß mit einem Blick erkennbar ist, ob die momenta­ne Spannkraft im gewünschten Bereich liegt.Since high clamping forces of around 8t can be achieved with high-pressure clamps due to the built-in power amplifier with low manual force, it is advantageous to know when a minimum clamping force and / or a desired maximum clamping force is available. In a tensioning device with a separate tie rod, a very favorable solution for this is that a gap is formed between part of the front surface of one leg of the tie rod and the rear surface of the fixed clamping jaw facing this, and that a pressure indicator device is installed in one leg of the tie rod has a movable take-off member that passes through the gap and rests on the fixed jaw. The pressure indicator preferably comprises an indicator disc with a pointer. The fixed clamping jaw has an upper wall which overlaps one leg of the tie rod and is provided with a viewing window, below which the indicator disc is located. Since the tie rod is deformed in accordance with the tension force and in such a way that one leg of the tie rod is inclined with increasing tension force the gap width between the leg and the fixed jaw is reduced. The removal link is shifted accordingly and this shift is indicated by turning the pointer. The indicator disc preferably has colored fields, so that it can be seen at a glance whether the instantaneous clamping force is in the desired range.

Zwar liegt es im Rahmen der Erfindung, anstelle der Analoganzeige eine Digitalanzeige zu verwenden, je­doch kommt es auf die exakte Einhaltung einer ganz bestimmten Spannkraft in der Regel nicht an. Wich­tig ist vielmehr, daß Ablesefehler ausscheiden und eine übersichtliche Ablesung mit einem Blick gewähr­leistet wird. Dafür eignet sich eine Analoganzeige besser.Although it is within the scope of the invention to use a digital display instead of the analog display, the exact maintenance of a very specific clamping force is generally not important. Rather, it is important that reading errors are eliminated and a clear reading is guaranteed at a glance. An analog display is more suitable for this.

Weiterhin liegt es im Rahmen der Erfindung, daß die Druckmeldeeinrichtung einen elektrischen Schalter um­faßt, der bei einer bestimmten Verformung des Zugankers anspricht und den Stromkreis einer Bearbeitungsmaschi­ne schließt. Der Schalter ist vorzugsweise mit einer Bewegungskomponente in Spannrichtung verstellbar an­geordnet. Wird ein Werkstück durch Unachtsamkeit nicht richtig festgespannt, kann es bei herkömmlichen Spann­geräten zu einer Beschädigung sehr wertvoller Bear­beitungsmaschinen kommen. Die Erfindung verhindert dies, denn solange ein einstellbarer Mindestspanndruck nicht erzielt ist, kann die Bearbeitungsmaschine nicht in Gang gesetzt werden. Sobald der Mindest­spanndruck erzielt ist, spricht der Schalter an und schließt den Stromkreis der Bearbeitungsmaschine, z.B. auch über eine Ultra-Schall oder Infrarot-Fern­übertragung.Furthermore, it is within the scope of the invention that the pressure detection device comprises an electrical switch which responds to a certain deformation of the tie rod and closes the circuit of a processing machine. The switch is preferably arranged to be adjustable with a movement component in the clamping direction. If a workpiece is not properly clamped due to carelessness, conventional clamping devices can damage very valuable processing machines. The invention prevents this because as long as an adjustable minimum clamping pressure is not achieved, the processing machine cannot be started. As soon as the minimum clamping pressure has been reached, the switch responds and closes the circuit of the processing machine, for example via ultra-sound or infrared remote transmission.

Anhand der Zeichnung, die einige Ausführungsbeispie­le darstellt, sei die Erfindung näher beschrieben. Es zeigt

  • FIG. 1 eine schematische Längsschnittansicht durch einen Schraubstock,
  • FIG. 2 eine Querschnittansicht längs der Linie 2-2 der FIG. 1,
  • FIG. 3 eine Seitenansicht des einen Schenkels eines U-förmigen Zugankers in größerem Maßstab,
  • FIG. 4 eine Querschnittansicht durch die Lagerung des Zugankers im Gehäuse,
  • FIG. 5 eine Querschnittansicht durch eine alternative Lagerung des Zugankers im Gehäuse,
  • FIG. 6 einen Längsschnitt durch einen im Gehäuse elastisch eingegossenen Zuganker,
  • FIG. 7 eine Querschnittansicht längs der Linie 7-7 der FIG. 6,
  • FIG. 8 eine Längsschnittansicht durch einen Zug­anker mit eingebauter Druckmeßdose,
  • FIG. 9 eine Längsschnittansicht durch einen Zug­anker mit eingebautem elektrischen Schalter,
  • FIG. 10 eine Draufsicht auf die festen Spannbacke des Schraubstockes mit eingebauter Druckmeß­dose gemäß FIG. 8,
  • FIG. 11 eine Längsschnittansicht eines Zugankers mit eingebautem Schalter ähnlich FIG. 9, jedoch mit verstellbarem Ansprechpegel,
  • FIG. 12 eine Längsschnittansicht ähnlich FIG. 11, jedoch mit einer abgewandelten Verstellmög­lichkeit und
  • FIG. 13 eine Querschnittansicht längs der Linien 13-13 der FIGUREN 11 und 12.
The invention will be described in more detail with reference to the drawing, which shows some exemplary embodiments. It shows
  • FIG. 1 shows a schematic longitudinal sectional view through a vice,
  • FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1,
  • FIG. 3 shows a side view of the one leg of a U-shaped tie rod on a larger scale,
  • FIG. 4 a cross-sectional view through the mounting of the tie rod in the housing,
  • FIG. 5 shows a cross-sectional view through an alternative mounting of the tie rod in the housing,
  • FIG. 6 shows a longitudinal section through a tie rod elastically cast into the housing,
  • FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 6,
  • FIG. 8 shows a longitudinal sectional view through a tie rod with built-in pressure load cell,
  • FIG. 9 shows a longitudinal sectional view through a tie rod with built-in electrical switch,
  • FIG. 10 is a plan view of the fixed jaw of the vice with a built-in pressure cell according to FIG. 8th,
  • FIG. 11 is a longitudinal sectional view of a tie rod with a built-in switch similar to FIG. 9, but with adjustable response level,
  • FIG. 12 is a longitudinal sectional view similar to FIG. 11, but with a modified adjustment option and
  • FIG. 13 is a cross-sectional view taken along lines 13-13 of FIGURES 11 and 12.

Ein Schraubstock 10 mit Gehäuse 12, gehäusefester Spannbacke 14, in der Spannbacke 14 schwimmend auf­gehängtem U-förmigem Zuganker 16, der einen ersten Schenkel 18, ein sich längs des Schraubstockes er­streckendes Joch 20 sowie einen zweiten Schenkel 22 aufweist, der eine Gewindemutter für eine Schraub­spindel 24 bildet, deren eines Ende eine bewegliche Spannbacke 26 hintergreift, welche am Gehäuse 12 in Längsschienen verschiebbar geführt ist, ist dadurch gekennzeichnet, daß der Zuganker 16 mittels einer Dreipunktaufhängung im Gehäuse 12 schwimmend gelagert ist. Der Zuganker 16 mit den beiden Schenkeln 18,22 und dem Joch 20 könnte ein einstückiges Bauteil bil­den. Im Ausführungsbeispiel ist der andere Schenkel 22 am Joch 20 des Zugankers 16 mittels Steckbolzen 28 stufenweise verstellbar angeordnet.A vice 10 with housing 12, fixed jaw 14, floating in the jaw 14 U-shaped tie rod 16, which has a first leg 18, a yoke 20 extending along the vise and a second leg 22 which has a threaded nut for a screw spindle 24 forms, one end of which engages behind a movable clamping jaw 26 which is displaceably guided on the housing 12 in longitudinal rails, is characterized in that the tie rod 16 is floatingly supported in the housing 12 by means of a three-point suspension is. The tie rod 16 with the two legs 18, 22 and the yoke 20 could form a one-piece component. In the exemplary embodiment, the other leg 22 on the yoke 20 of the tie rod 16 is arranged so that it can be adjusted in stages by means of plug pins 28.

Der Zugankerschenkel 18 weist an seinen beiden Sei­tenflächen jeweils eine muldenartige Vertiefung 30 auf. Die beiden Vertiefungen 30 sind quer ausgerich­tet. Die Seitenwände der festen Spannbacke 14 haben koaxiale Querbohrungen 32, in denen sich je ein Rastbolzen 34, eine Druckfeder 36 und ein Ge­windestück 38 befinden. Die Gewindestücke 38 sind soweit in den Querbohrungen 32 verschraubt, daß die Rastbolzen 34 mit einer gewissen Vorspannung in die muldenartigen Vertiefungen 30 des Zugankerschenkels 18 eindringen. Die Rastbolzen 34 und die Vertiefungen 30 sind bezüglich einander so ausgebildet, daß eine relative Verschiebung in sämtlichen Richtungen parallel zu den Seitenflächen des Schenkels 18 möglich ist. Die muldenartigen Vertiefungen 30 sind z.B. konisch ausgebildet, während die Vorderflächen der Rastbol­zen 34 halbkugelartig geformt sind. Die Federn 36 suchen den Zuganker 16 so einzustellen, daß die die Zentren der muldenartigen Vertiefungen 30 enthalten­de Querachse mit der Querachse der Bohrungen 32 zu­ sammenfällt.The tie rod leg 18 has a trough-like depression 30 on each of its two side surfaces. The two depressions 30 are aligned transversely. The side walls of the fixed clamping jaw 14 have coaxial transverse bores 32, in each of which a locking bolt 34, a compression spring 36 and a threaded piece 38 are located. The threaded pieces 38 are screwed so far into the transverse bores 32 that the locking bolts 34 penetrate the trough-like recesses 30 of the tie rod leg 18 with a certain preload. The latching bolts 34 and the depressions 30 are designed with respect to one another such that a relative displacement in all directions parallel to the side surfaces of the leg 18 is possible. The trough-like depressions 30 are, for example, conical, while the front surfaces of the locking bolts 34 are hemispherical. The springs 36 seek to adjust the tie rod 16 so that the transverse axis containing the centers of the trough-like depressions 30 is aligned with the transverse axis of the bores 32 collapses.

Das der Spannzone zugewandte obere Ende des linken Schenkels 18 ist in Form einer im Querschnitt abge­rundeten Nase 40 ausgebildet. An die Nase 40 schließt sich eine schräge ebene Vorderfläche 42 des Schenkels 18 an, die mit einer zur Spannfläche parallelen Ebene 44 einen Winkel von etwa 5° einschließt. Die Hinter­fläche 46 (FIG. 8) der festen Spannbacke 14 liegt im Spannzustand in der mit 44 bezeichneten Ebene, sodaß sich unterhalb der Nase 40 ein Spalt 48 bildet, der zum Joch 20 des Zugankers 16 allmählich breiter wird.The upper end of the left leg 18 facing the clamping zone is designed in the form of a nose 40 which is rounded in cross section. The nose 40 is adjoined by an oblique flat front surface 42 of the leg 18, which encloses an angle of approximately 5 ° with a plane 44 parallel to the clamping surface. The rear surface 46 (FIG. 8) of the fixed clamping jaw 14 lies in the clamped state in the plane designated 44, so that a gap 48 forms below the nose 40, which gradually widens towards the yoke 20 of the tie rod 16.

Der Schenkel 18 des Zugankers 16 besteht aus Vollma­terial. Das Joch 20 hat dagegen einen U-förmigen Quer­schnitt, in den der andere Schenkel 22 eingreift. Die Querschnittskontur des Schenkels 18 ist über die gesam­te Zugankerbreite dieselbe.The leg 18 of the tie rod 16 is made of solid material. The yoke 20, however, has a U-shaped cross section, in which the other leg 22 engages. The cross-sectional contour of the leg 18 is the same over the entire tie rod width.

Die muldenartigen Vertiefungen 30 im Schenkel 18 und die Bohrungen 32 in der festen Spannbacke 14 sind so angeordnet, daß bei gegenseitiger Querausrichtung die Nase 40 die Hinterfläche 46 der festen Spannbacke etwa berührt. Bei der Herstellung brauchen jedoch kei­ne großen Genauigkeitsanforderungen eingehalten zu wer­den. Wird nämlich der Schraubstock 10 gespannt, so rich­tet sich der Zuganker 16 selbsttätig aus und zwar der­ art, daß die Rastbolzen 34 sich in den muldenarti­gen Vertiefungen 30 derart verlagern, daß ein durch­gehender Kontakt der Nase 40 an der Hinterfläche 46 der festen Spannbacke 14 theoretisch längs einer Be­rührungslinie stattfindet. Beim weiteren Spannen ver­formt sich der Zuganker und die Nase 40 wälzt sich an der Hinterfläche 46 ab, wobei aber gleichwohl noch Li­nienberührung erhalten bleibt.The trough-like depressions 30 in the leg 18 and the bores 32 in the fixed clamping jaw 14 are arranged such that the nose 40 roughly touches the rear surface 46 of the fixed clamping jaw with mutual transverse alignment. However, no great accuracy requirements need to be met during production. If the vise 10 is clamped, the tie rod 16 automatically aligns itself with the Art that the locking pin 34 shift in the trough-like recesses 30 such that a continuous contact of the nose 40 on the rear surface 46 of the fixed jaw 14 takes place theoretically along a line of contact. As the tensioning continues, the tie rod deforms and the nose 40 rolls on the rear surface 46, but line contact is still retained.

Zur Positionierung des Zugankers reicht ansich die beidseitige Halterung des Schenkels 18 aus. Zusätz­lich ist in FIG. 1 im Bereich des freien Endes des Joches 20 ein in den Boden des Gehäuses 12 einge­setzter federnder Rastbolzen entsprechend den Ele­menten 34, 36, 38 vorgesehen, sodaß eine Dreipunkt­aufhängung erzielt wird. Beim Durchbiegen des Joches 20 überträgt somit das Jochende keine Kräfte auf den Gehäuseboden.The positioning of the leg 18 on both sides is sufficient for positioning the tie rod. In addition, in FIG. 1 in the area of the free end of the yoke 20, a resilient locking bolt corresponding to the elements 34, 36, 38 is inserted into the bottom of the housing 12, so that a three-point suspension is achieved. When the yoke 20 bends, the yoke end therefore does not transmit any forces to the housing base.

FIG. 5 veranschaulicht eine Alternative zur schwimmen­den Lagerung des Zugankerschenkels 18. Die Seitenwän­de der festen Spannbacke 14 weisen quer ausgerichte­te Bohrungen 50 auf, in die elastisch verformbare Hülsen 52 eingesetzt sind. Der Schenkel 18 hat eine koaxiale Bohrung mit einem Innendurchmesser gleich demjenigen der elastischen Hülsen 52. Ein Steckbol­zen 54 durchsetzt die Bohrung des Schenkels 18 und die elastischen Hülsen 52.FIG. 5 illustrates an alternative to the floating mounting of the tie rod leg 18. The side walls of the fixed clamping jaw 14 have transversely aligned bores 50, into which elastically deformable sleeves 52 are inserted. The leg 18 has a coaxial bore with an inner diameter equal to that of the elastic sleeves 52. A plug pin 54 passes through the bore of the leg 18 and the elastic sleeves 52.

Alternativ ist es auch möglich, in dem Schenkel 18 eine elastische Hülse 52 einzusetzen, jedoch wird die erstbeschriebene Ausführung gemäß FIG. 5 vor­gezogen, um den Schenkel 18 möglichst wenig zu schwächen.Alternatively, it is also possible to use an elastic sleeve 52 in the leg 18, but the first described embodiment according to FIG. 5 preferred to weaken the leg 18 as little as possible.

Die FIGUREN 6 und 7 veranschaulichen eine dritte Alternative zur schwimmenden Lagerung des Zugankers 16. Der Zuganker 16 ist bodenseitig und an beiden Seitenflächen über seine gesamte Länge mittels elastischer Schichten 56, 58 mit dem Gehäuse 12 ver­bunden. D.h. die zwischen Zuganker 16 und Gehäuse gebildeten Spalten sind mit elastischem Material aus­gegossen. Das elastische Material gewährleistet eine Selbsteinstellung des Zugankers 16 während des Spann­vorganges und verhindert gleichzeitig, daß Metall­späne in die Spalten eindringen können. Eine zusätz­liche mechanische Lagerung des Zugankers 16 am Ge­häuse 12 entfällt damit.FIGURES 6 and 7 illustrate a third alternative to the floating mounting of the tie rod 16. The tie rod 16 is connected to the housing 12 on the bottom side and on both side surfaces over its entire length by means of elastic layers 56, 58. I.e. the gaps formed between tie rod 16 and housing are filled with elastic material. The elastic material ensures a self-adjustment of the tie rod 16 during the tensioning process and at the same time prevents metal chips from penetrating into the gaps. An additional mechanical mounting of the tie rod 16 on the housing 12 is thus eliminated.

Zur Kontrolle der Spannkraft ist in den Schenkel 18 des Zugankers 12 eine sogenannte handelsübliche Druck­meßdose 60 eingebaut, die eine, unter einem Sichtfen­ster 62 in einer den Schenkel 18 abdeckenden Oberwand 64 der festen Spannbacke 14 liegende Anzeigescheibe 66 , sowie einen Druckstift 68 aufweist, der den Spalt 48 zwischen den einander zugewandten Flä­chen 42 und 46 des Schenkels 18 bzw. der festen Spannbacke 14 durchdringt und an der Hinterflä­che 46 der festen Spannbacke 14 anliegt. Beim Spannvorgang verschwenkt der Schenkel 18 relativ zum Joch 20 des Zugankers 16 nach links, wodurch sich die Breite des Spaltes 48 verkleinert. Der Stift 68 verschiebt sich dadurch in das Innere der Anzeigeeinrichtung 60. Diese Einwärtsbewe­gung des Stiftes 68 wird durch ein eingebautes Getriebe in eine Drehung eines oberhalb der An­zeigescheibe 66 spielenden Zeigers 70 umgesetzt.To control the clamping force, a so-called commercially available pressure cell 60 is installed in the leg 18 of the tie rod 12, which has an indicator disc 66, which is located under a viewing window 62 in an upper wall 64 of the fixed clamping jaw 14 covering the leg 18, and has a pressure pin 68, which penetrates the gap 48 between the mutually facing surfaces 42 and 46 of the leg 18 or the fixed clamping jaw 14 and abuts the rear surface 46 of the fixed clamping jaw 14. During the tensioning process, the leg 18 pivots to the left relative to the yoke 20 of the tie rod 16, as a result of which the width of the gap 48 is reduced. The pin 68 thereby moves into the interior of the display device 60. This inward movement of the pin 68 is converted by a built-in gear into a rotation of a pointer 70 playing above the display disk 66.

Gemäß FIGUREN 11 und 12 ist in den Schenkel 18 des Zugankers 16 ein elektrischer Schalter 72 eingesetzt, dessen beweglicher Schaltstift 74 in seiner Funktion dem Stift 68 der Anzeigeein­richtung 60 entspricht. Die beiden Stromkabel 76 liegen im Steuerstromkreis zum Ingangsetzen einer Bearbeitungsmaschine bzw. sind mit einem Sender verbunden, der einen entsprechenden Empfänger der Bearbeitungsmaschine ansteuert. Unterhalb ei­ner bestimmten Spannkraft ist der Schalter 72 ge­öffnet. Bei Erhöhung der Spannkraft verformt sich der Zuganker 16. Die Breite des Spaltes 48 ver­ringert sich und der Schalter 72 schließt, wodurch der Stromkreis der Bearbeitungsmaschine aktiviert wird. Eine Beschädigung der Bearbeitungsmaschine aufgrund eines nicht genügend festgespannten Werk­stückes ist damit ausgeschlossen.According to FIGURES 11 and 12, an electrical switch 72 is inserted in the leg 18 of the tie rod 16, the function of its movable switching pin 74 corresponds to that of the pin 68 of the display device 60. The two power cables 76 are in the control circuit for starting a processing machine or are connected to a transmitter which controls a corresponding receiver of the processing machine. The switch 72 is open below a certain clamping force. When the clamping force is increased, the tie rod 16 deforms. The width of the gap 48 decreases and the switch 72 closes, as a result of which the processing machine circuit is activated. Damage to the processing machine due to an insufficiently clamped workpiece is therefore excluded.

Gemäß FIG. 11 läßt sich der Ansprechpegel des Schal­ters 72 dadurch verstellen, daß auf der Hülse 78 ein Gewindering 80 befestigt oder einstückig mit dieser ausgebildet ist. Der Gewindering 80 ist in einem ent­sprechenden Gewindeabschnitt der Aufnahmebohrung für die Hülse 78 verschraubbar. Eine querliegende Fixier­schraube 82 sichert die Schalterhülse 78 in der ge­wünschten Stellung.According to FIG. 11, the response level of the switch 72 can be adjusted in that a threaded ring 80 is attached to the sleeve 78 or is formed integrally therewith. The threaded ring 80 can be screwed into a corresponding threaded section of the receiving bore for the sleeve 78. A transverse fixing screw 82 secures the switch sleeve 78 in the desired position.

Gemäß FIG. 12 erfolgt die Vorwahl des Ansprechpegels des Schalters 72 durch Verschrauben der Bundhülse 78 unter Verwendung von Distanzscheiben 84. Die Fixierung erfolgt wiederum durch den Gewindestift 82.According to FIG. 12, the response level of the switch 72 is preselected by screwing the collar sleeve 78 using spacers 84. The fixation is in turn carried out by the setscrew 82.

Claims (14)

1. Spanngerät, insbesondere Präzisions-Hochdruck­spanner, mit einem Gehäuse, einer gehäusefesten Spannbacke, einem im Gehäuse angeordneten sepa­raten, etwa U-förmigen Zuganker, dessen einer Schenkel die feste Spannbacke hintergreift und dessen anderer Schenkel eine, von einer Schraub­spindel durchsetzte Gewindemutter bildet, wobei das eine Ende der Schraubspindel eine verschieb­bare Spannbacke hintergreift und die Spannflächen beider Spannbacken parallel liegen, dadurch ge­kennzeichnet, daß zwischen dem einen Schenkel (18) und der festen Spannbacke (14) ein sich über min­destens den größten Teil der Schenkelbreite er­streckender angenähert linienförmiger Kontakt be­steht und daß der Zuganker (16) sich selbstein­stellend im Gehäuse (12) derart schwimmend aufge­hängt ist, daß er um eine, die Kontaktlinie zwi­schen dem einen Schenkel (18) und der festen Spann­backe (14) einerseits und die Gehäusebodenfläche andererseits rechtwinklig kreuzende imaginäre Achse begrenzt schwenkbar ist.1. clamping device, in particular precision high-pressure clamps, with a housing, a housing-fixed clamping jaw, a separate, approximately U-shaped tie rod arranged in the housing, one leg of which engages behind the fixed clamping jaw and the other leg of which forms a threaded nut penetrated by a screw spindle, whereby one end of the screw spindle engages behind a displaceable clamping jaw and the clamping surfaces of the two clamping jaws are parallel, characterized in that there is an approximately linear contact between the one leg (18) and the fixed clamping jaw (14) and extends over at least the largest part of the leg width that the tie rod (16) is self-adjusting suspended in the housing (12) in such a way that it imaginatively crosses at a right angle the contact line between the one leg (18) and the fixed clamping jaw (14) on the one hand and the housing bottom surface on the other Axis is pivotable to a limited extent. 2. Spanngerät nach Anspruch 1, dadurch gekennzeich­net, daß der eine Schenkel (18) im Bereich der Kontaktlinie eine im Querschnitt konvex gerundete Nase (40) aufweist und daß angrenzend an die Nase zwischen dem einen Schenkel (18) und der festen Spannbacke (14) ein bis zum Joch (20) des Zug­ankers (16) reichender Freiraumspalt (48) gebil­det ist.2. Clamping device according to claim 1, characterized in that one leg (18) in the region of the contact line has a convexly rounded nose in cross section (40) and that adjacent to the nose between the one leg (18) and the fixed clamping jaw (14 ) a free space gap (48) extending up to the yoke (20) of the tie rod (16) is formed. 3. Spanngerät nach Anspruch 2, dadurch gekennzeich­net, daß sich die Breite des Freiraumspaltes (48) zum Zugankerjoch (20) hin allmählich vergrößert.3. Clamping device according to claim 2, characterized in that the width of the free space gap (48) to the tie rod yoke (20) gradually increases. 4. Spanngerät nach Anspruch 3, dadurch gekennzeich­net, daß die an die Nase (40) angrenzende Vorder­fläche (42) des einen Schenkels (18) mit der die Kontaktlinie enthaltenden, parallel zur Spannfläche angeordneten Hinterfläche (46) der festen Spann­backe (14) einen spitzen Winkel bildet.4. Clamping device according to claim 3, characterized in that the nose (40) adjacent front surface (42) of one leg (18) with the contact line containing, arranged parallel to the clamping surface rear surface (46) of the fixed jaw (14) one forms an acute angle. 5. Spanngerät nach einem der Ansprüche 1 bis 4, da­durch gekennzeichnet, daß in beiden Seitenflächen des einen Schenkels (18) je eine etwa muldenartige Ausnehmung (30) vorgesehen ist, in die ein in je­der Seitenwand der festen Spannbacke (14) federnd gelagerter Bolzen (34) in der Seitenflächenebene relativ verschiebbar eingreift.5. Clamping device according to one of claims 1 to 4, characterized in that an approximately trough-like recess (30) is provided in each of the two side surfaces of one leg (18), in which a resilient in each side wall of the fixed clamping jaw (14) mounted pin (34) engages relatively displaceably in the side surface plane. 6. Spanngerät nach einem der Ansprüche 1 bis 4, da­durch gekennzeichnet, daß mit dem einen Schenkel (18) beidseitig vorspringende koaxiale Bolzen­enden (54) in Verbindung stehen,die mittels im Schenkel (18) und/oder in der festen Spannbacke (14) vorgesehenen verformbaren Lagermitteln (52) gehaltert sind.6. Clamping device according to one of claims 1 to 4, characterized in that with the one leg (18) projecting on both sides coaxial bolt ends (54) are connected by means of in the leg (18) and / or in the fixed clamping jaw (14) provided deformable bearing means (52) are held. 7. Spanngerät nach Anspruch 6, dadurch gekennzeichnet, daß die verformbaren Lagermittel aus elastisch ver­formbaren Hülsen (52) bestehen.7. Clamping device according to claim 6, characterized in that the deformable bearing means consist of elastically deformable sleeves (52). 8. Spanngerät nach einem der Ansprüche 1 bis 4, da­durch gekennzeichnet, daß zwischen Zuganker (16) und Gehäuse (12) elastisch verformbare Verbindungs­mittel (56, 58) vorgesehen sind.8. Clamping device according to one of claims 1 to 4, characterized in that between the tie rod (16) and housing (12) elastically deformable connecting means (56, 58) are provided. 9. Spanngerät nach Anspruch 8, dadurch gekennzeichnet, daß die zwischen Zuganker (16) und Gehäuse (12) ge­bildeten Spalten durch eine elastische Masse (56, 58) ausgegossen sind.9. Clamping device according to claim 8, characterized in that the gaps formed between the tie rod (16) and the housing (12) are poured out by an elastic mass (56, 58). 10. Spanngerät, insbesondere Präzisions-Hochdruck­spanner, mit einem Gehäuse, einer gehäusefesten Spannbacke, einem im Gehäuse angeordneten sepa­raten, etwa U-förmigen Zuganker, dessen einer Schenkel die feste Spannbacke hintergreift und dessen anderer Schenkel eine, von einer Schraub­spindel durchsetzte Gewindemutter bildet, wobei das eine Ende der Schraubspindel eine verschieb­bare Spannbacke hintergreift und die Spannflächen beider Spannbacken parallel liegen, dadurch ge­kennzeichnet, daß zwischen einem Teil der Vorder­fläche (42) des einen Schenkels (18) und der die­ser zugewandten Hinterfläche (46) der festen Spann­backe (14) ein Spalt (48) gebildet ist, daß im ei­nen Schenkel (18) des Zugankers (16) eine Druckmel­deeinrichtung (60; 72) eingebaut ist, die ein be­wegliches Abnahmeglied (68; 74) aufweist, das den Spalt (48) durchsetzt und an der festen Spannbacke (14) anliegt.10. Clamping device, in particular precision high-pressure clamps, with a housing, a clamping jaw fixed to the housing, a separate, approximately U-shaped tie rod arranged in the housing, one leg of which engages behind the fixed clamping jaw and the other leg forms a threaded nut penetrated by a screw spindle, whereby one end of the screw spindle engages behind a displaceable clamping jaw and the clamping surfaces of both clamping jaws are parallel, characterized in that between a part of the front surface (42) of one leg (18) and the rear surface (46) of the fixed clamping jaw (14) facing it Gap (48) is formed that in one leg (18) of the tie rod (16) a pressure indicator device (60; 72) is installed, which has a movable removal member (68; 74) which passes through the gap (48) and on the fixed jaw (14). 11. Spanngerät, nach Anspruch 10, dadurch gekennzeich­net, daß die Druckmeldeeinrichtung (60) eine An­zeigescheibe (66) mit Zeiger (70) aufweist.11. Clamping device according to claim 10, characterized in that the pressure signaling device (60) has an indicator disc (66) with pointer (70). 12. Spanngerät, nach Anspruch 11, dadurch gekennzeich­net, daß die feste Spannbacke (14) eine, den einen Schenkel (18) des Zugankers (16) überlappende Ober­wand (64) aufweist, die mit einem Sichtfenster (62) versehen ist, unterhalb dessen sich die Anzeige­scheibe (66) befindet.12. Clamping device, according to claim 11, characterized in that the fixed clamping jaw (14) one, the one Leg (18) of the tie rod (16) has an overlapping upper wall (64) which is provided with a viewing window (62) below which the indicator disc (66) is located. 13. Spanngerät, nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, daß die Druckmeldeein­richtung (60; 72) einen elektrischen Schalter um­faßt, der bei einer bestimmten Verformung des Zug­ankers (16) anspricht und den Stromkreis einer Be­arbeitungsmaschine schließt.13. Clamping device according to one of claims 10 to 12, characterized in that the pressure signaling device (60; 72) comprises an electrical switch which responds to a certain deformation of the tie rod (16) and closes the circuit of a processing machine. 14. Spanngerät, nach Anspruch 13, dadurch gekennzeich­net, daß der Schalter (72) mit einer Bewegungs­komponente in Spannrichtung verstellbar und in der gewünschten Ansprechstellung mittels eines Fixierstiftes (82) fixierbar ist.14. Clamping device according to claim 13, characterized in that the switch (72) is adjustable with a movement component in the clamping direction and can be fixed in the desired response position by means of a fixing pin (82).
EP86111577A 1985-09-12 1986-08-21 Clamping device Expired - Lifetime EP0215326B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111577T ATE69190T1 (en) 1985-09-12 1986-08-21 CLAMPING DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853532490 DE3532490A1 (en) 1985-09-12 1985-09-12 TENSION DEVICE
DE3532490 1985-09-12

Publications (3)

Publication Number Publication Date
EP0215326A2 true EP0215326A2 (en) 1987-03-25
EP0215326A3 EP0215326A3 (en) 1988-10-05
EP0215326B1 EP0215326B1 (en) 1991-11-06

Family

ID=6280733

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111577A Expired - Lifetime EP0215326B1 (en) 1985-09-12 1986-08-21 Clamping device

Country Status (5)

Country Link
US (1) US4664365A (en)
EP (1) EP0215326B1 (en)
AT (1) ATE69190T1 (en)
DE (2) DE3532490A1 (en)
ES (1) ES2002333A6 (en)

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WO2005056240A2 (en) * 2003-12-12 2005-06-23 Irwin Industrial Tools Gmbh Clamping and/or splitting tool with a step gear and a spring drive mechanism for continuos displacement of both clamping cheeks relative to one another
US7604224B2 (en) * 2005-09-28 2009-10-20 The Stanley Works Motorized clamp
US7389978B2 (en) * 2005-09-28 2008-06-24 The Stanley Works Adjustable clamp
US7131642B1 (en) 2005-09-28 2006-11-07 Stanley Tools And Hardware Adjustable clamp
US7090209B1 (en) 2005-09-28 2006-08-15 Stanley Tools And Hardware Adjustable clamp and method of using an adjustable clamp
US8870044B1 (en) * 2009-03-31 2014-10-28 Brica, Inc. Snack and drink holder
KR200477867Y1 (en) * 2013-03-20 2015-07-30 윤환식 Vise for fixing the manufactured products
CN105041793A (en) * 2015-06-09 2015-11-11 郭斌 Drying oven board corner fastening device for gypsum drying machine

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Also Published As

Publication number Publication date
DE3682354D1 (en) 1991-12-12
ATE69190T1 (en) 1991-11-15
EP0215326B1 (en) 1991-11-06
EP0215326A3 (en) 1988-10-05
ES2002333A6 (en) 1988-08-01
DE3532490A1 (en) 1987-03-19
US4664365A (en) 1987-05-12

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