EP1762339A1 - Flexible vice jaw - Google Patents

Flexible vice jaw Download PDF

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Publication number
EP1762339A1
EP1762339A1 EP05019409A EP05019409A EP1762339A1 EP 1762339 A1 EP1762339 A1 EP 1762339A1 EP 05019409 A EP05019409 A EP 05019409A EP 05019409 A EP05019409 A EP 05019409A EP 1762339 A1 EP1762339 A1 EP 1762339A1
Authority
EP
European Patent Office
Prior art keywords
clamping
workpiece
clamping jaw
jaw
force
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
EP05019409A
Other languages
German (de)
French (fr)
Other versions
EP1762339B1 (en
Inventor
Jasko Sabanac
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.)
System 3R International AB
Original Assignee
System 3R International AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to AT05019409T priority Critical patent/ATE504395T1/en
Application filed by System 3R International AB filed Critical System 3R International AB
Priority to EP05019409A priority patent/EP1762339B1/en
Priority to DE502005011222T priority patent/DE502005011222D1/en
Priority to KR1020087003666A priority patent/KR20080036605A/en
Priority to US12/065,329 priority patent/US20080197554A1/en
Priority to JP2008529479A priority patent/JP2009506901A/en
Priority to CN200680032223XA priority patent/CN101257998B/en
Priority to PCT/EP2006/005585 priority patent/WO2007028431A1/en
Publication of EP1762339A1 publication Critical patent/EP1762339A1/en
Priority to IL187791A priority patent/IL187791A0/en
Application granted granted Critical
Publication of EP1762339B1 publication Critical patent/EP1762339B1/en
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • 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
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2405—Construction of the jaws
    • B25B1/241—Construction of the jaws characterised by surface features or material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2405—Construction of the jaws
    • B25B1/2473—Construction of the jaws with pull-down action on the workpiece

Definitions

  • the invention relates to a clamping jaw for a vice with a clamping plate and at least two bridges.
  • a vise is described with a bed over which a first fixed, a first clamping plate having jaw rises, and with a second, movably guided on the bed, a second clamping plate having jaw, which is rotatably connected to a spindle rotatably mounted on the bed, wherein the spindle extends in a longitudinal channel formed in the bed, and is included in the longitudinal channel of the foot of the second clamping jaw, which is connected via a captured in a longitudinal slot of the bed neck with the second clamping plate.
  • the bed has a planar reference surface extending transversely to the clamping plates and between them, that at least two adjacent clamping surfaces extending in the direction of the reference surface are formed on the bed, of which a first Clamping surface is inclined relative to the reference surface and the second clamping surface is inclined relative to the reference surface in opposite directions, and that at least two clamping surfaces adjacent clamping surfaces are formed on the second clamping jaw, of which the first clamping surface parallel to the first clamping surface and the second clamping surface parallel to the second Clamping surface extends.
  • Another jig is in the EP 0 362 753 disclosed. It serves to hold workpieces and has at a distance relative to each other adjustable Clamping jaws, which have mutually facing clamping surfaces.
  • a workpiece support is available. It is provided at the one or more clamping surfaces of the clamping jaws adjustable from the workpiece to be clamped and acted in the clamping direction pull-down device. This has a over the clamping surface protruding and obliquely to the workpiece support nevendes pull-down.
  • this pull-down element is acted upon and pivots obliquely downwards in the direction of the workpiece support, wherein the workpiece is either taken along or is subjected to force in this direction, so that a secure abutment takes place on the support.
  • thermoforming system for clamping devices on workpiece processing machines, consisting of two opposing parts, a stop - thermoforming clamp with fixed jaws and a thermoformer with movable jaws, between which the workpiece to be machined is clamped, with a stop thermoforming clamp is present as a stationary stop member which consists of a jaw body which is arranged on a holding plate, wherein the jaw body is equipped for clamping a workpiece with protective jaws, which has a vertical clamping surface to the holding plate, wherein the jaw body rests against a support and with an elastically bendable part relative to the holding plate and has a shape, whereby upon application of a force acting parallel to the holding plate thrust force on the protective jaws on the holding plate directed force, which is greater than the lifting force is transmitted to the workpiece.
  • a main requirement for an optimal clamping system is a clamping of a workpiece, which must not move away from the vise bed during clamping and in the clamped state.
  • the workpiece is exposed to flowing water up to pressures of 100 bar during operation to flush away chips or waste material. This can lead to vibrations of the clamped workpiece, which can negatively affect the exact clamping of the workpiece.
  • the problem with the prior art is that the required strength when clamping a tool is not achieved due to more demanding application requirements.
  • the workpieces become larger, for example, so that a Clamping device of the present type must have the ability to workpieces, which is relatively large to the size of the clamping tool to clamp optimally.
  • wire erosion machines have higher working speeds. This requires higher water pressures for the removal of the resulting chips, which in turn has a higher load on the workpiece result.
  • Another disadvantage is the use of protruding workpieces due to low load possibility.
  • a protruding workpiece generates a certain bending moment, which can negatively burden the clamping force.
  • the invention is achieved in that the clamping force of the clamping plate is variable on the clamped workpiece along the surface facing the workpiece.
  • the clamping plate has an outer and an inner bridge.
  • outer and inner bridge may be elastically resilient in the tension direction, wherein the spring constant of the inner bridge is smaller than the spring constant of the outer bridge.
  • the bridges are curved, wherein the radii of curvature of the two bridges can be different.
  • the inner bridge has a greater curvature than the outer bridge.
  • a displacement of the point of application of the clamping force is achieved in parallel to the vise bed with the result of an increase in the torque which acts on the workpiece.
  • the strength of the clamping in the direction perpendicular to the vise bed is increased.
  • the essential feature is the achievement of a maximum load capacity.
  • the load capacity is given by the maximum bending moment, which is a function of the resulting forces on the workpiece.
  • the load capacity is significantly increased with this invention.
  • the inner bridge is configured S-shaped.
  • the invention is not limited to the S-shaped configuration of the bridge. All conceivable forms that lead to the goal of increasing the clamping force and load capacity are conceivable.
  • the clamping jaw between the bridges have a cavity, wherein the curvatures of the cavity are designed to avoid overloading.
  • the jaw below the inner bridge may have a curved slot to avoid overloading.
  • the slot serves as security for overloading the clamping tool.
  • the slot width is a geometric measure for the maximum allowable load.
  • FIG. 1 shows a vice 2 with clamping jaws 11 and 12 known from the prior art in a three-dimensional representation.
  • the jaw 11 is integral with the vise body 13 fixedly connected.
  • holes 14 are provided for attachment in a conventional manner to a work table.
  • the vise bed 15 is arranged, on which the workpiece 6 shown in Figure 2 is clamped.
  • a spindle assembly 16 is installed inside the vise body 13.
  • the spindle assembly 16 consists in a conventional manner of a spindle 22 which is secured on one side of the vice body 13 by means of a nut 17 and on the other side by a rotatable handle 18 for actuating the spindle 22 is completed.
  • FIG. 2 shows the side view of a vise with an exemplary embodiment of the clamping jaws 1.
  • a workpiece 6 is clamped.
  • the reference symbols in FIG. 2 correspond to the reference symbols in FIG. 1.
  • FIG. 3 a clamping jaw 1, which is held movably on a guide 23, is shown in a three-dimensional view.
  • a possible embodiment of a clamping jaw 1 is shown in the side view in Figure 4.
  • the clamping jaw 1 has a clamping plate 3 with the workpiece 6 facing surface 7. Further, in the clamping jaw 1, an outer and an inner bridge 4 and 5 are arranged. The course of the inner and outer bridge 4 and 5 is not parallel. The inner bridge 5 is more curved than the outer bridge 4 in order to achieve a lower rigidity. Due to the spring properties thus obtained, it is possible to achieve a full-surface contact of the surface 7 of the clamping plate 3 with the workpiece 6.
  • the force relationships in the clamped state is described in more detail in FIGS. 5a and 5b.
  • the embodiment shown here shows an arcuately shaped outer bridge 4 and an S-shaped inner bridge 5.
  • the cavity 8 enclosed by the bridges 4 and 5 is provided with such curvatures 9 that an overstressing of the clamping jaws is prevented. Furthermore, a curved, for example S-shaped slot 10 between the vise bed 15 and the inner bridge 5 is provided as overload protection. The gap width formed by the slot 10 becomes zero if the torque produced during clamping would become too high.
  • FIGS. 5a and 5b A comparison of the balance of forces in the clamped state between a known clamping jaw and an exemplary clamping jaw according to the invention is shown in FIGS. 5a and 5b.
  • FIG. 5a shows the situation according to the prior art.
  • the two bridges 19 and 20 include as cavity 21 a parallelogram.
  • the clamping force K is constant over the entire surface 24 of the clamping plane 25.
  • the resulting force K r engages in the middle M of the clamping plane 25, so that a torque D m1 , formed from the resultant force K r and the distance L 1 . results.
  • the force flow in the invention is different, represented by the example in FIG. 5b. Due to the specially curved bridges 4 and 5, the clamping forces K decrease from top to bottom. The point of application of the resulting force K r is above the center M of the surface 7 of the clamping plate 3. Thus, the distance L 2 is greater than the distance L 1 in Figure 5a. Consequently, the torque D m2 increases over the torque D m1 over the prior art. Essential is the achievement of a maximum bending moment, which results from the forces K r and F 2 multiplied by the arm L 2 . The workpiece is held in the critical bending direction by friction. The flexural strength is significantly dependent on the length L 2 .
  • the invention is not limited to the curved shapes of the bridges and the slot shown in the figures. It is essential to find such a geometry, which results in a higher force in the direction of the vice bed compared to the prior art with straight and parallel geometric properties.
  • the advantages associated with the invention are in particular to achieve a greater load capacity and a greater clamping force at the same operating torque by a suitable shape of the clamping jaws.
  • the handling of the vise with the inventive jaws less resilient to their joints and muscles.

Landscapes

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

Abstract

The jaw (1) has a clamping plate (3), and outer and inner beams (4,5), where the inner beam is S-shaped. The clamping force applied on a clamped workpiece by the clamping plate is varied along an upper surface (7) that is adjusted to the workpiece. The resulting clamping force lies above the center of the clamping plate. The beams are resilient and are bent, where the spring constant of the inner beam is less than the spring constant of the outer beam.

Description

Die Erfindung betrifft eine Spannbacke für einen Schraubstock mit einer Spannplatte und mindestens zwei Brücken.The invention relates to a clamping jaw for a vice with a clamping plate and at least two bridges.

Zum genauen Bearbeiten eines Werkstückes, beispielsweise in einer Funkenerosionsmaschine, Werkzeugmaschine etc., ist es erforderlich, dass das Werkstück, welches bearbeitet werden soll, fest gegen das Schraubstockbett eingespannt ist. Es besteht jedoch die Möglichkeit, dass sich das Werkstück geringfügig beim Einspannen vom Schraubstockbett weg bewegt. Diese Unsicherheit kann zu Ungenauigkeiten führen.For accurate machining of a workpiece, for example in a spark erosion machine, machine tool, etc., it is necessary that the workpiece which is to be processed, is clamped firmly against the vise bed. However, there is the possibility that the workpiece will move slightly away from the vise bed during clamping. This uncertainty can lead to inaccuracies.

Aus der EP 0 196 544 A1 wird ein Schraubstock mit einem Bett beschrieben, über das sich eine erste feststehende, eine erste Spannplatte aufweisende Spannbacke erhebt, sowie mit einer zweiten, am Bett beweglich geführten, eine zweite Spannplatte aufweisenden Spannbacke, die mit einer an Bett drehbar befestigten Spindel drehbar verbunden ist, wobei die Spindel sich in einem im Bett ausgebildeten Längskanal erstreckt, und im Längskanal vom Fuß der zweiten Spannbacke umfasst ist, welche über einen in einem Längsschlitz des Bettes eingefangen Hals mit der zweiten Spannplatte verbunden ist. Zur exakten Positionierung eines zwischen den Spannbacken eirtgespannten Werkstückes ist vorgesehen, dass das Bett eine ebene, sich quer zu den Spannplatten und zwischen diesen erstreckende Referenzfläche aufweist, dass am Bett wenigstens zwei benachbarte sich in Richtung der Referenzfläche erstreckende Spannflächen ausgebildet sind, von denen eine erste Spannfläche relativ zur Referenzfläche geneigt ist und die zweite Spannfläche relativ zur Referenzfläche gegensinnig geneigt ist, und dass an der zweiten Spannbacke wenigstens zwei zu den Spannflächen benachbarte Klemmflächen ausgebildet sind, von denen die erste Klemmfläche sich parallel zur ersten Spannfläche und die zweite Klemmfläche parallel zur zweiten Spannfläche erstreckt. Dadurch wird eine sehr schmale Gestaltung des Schraubstockes ermöglicht, die diesen zur Verwendung an eine Drahtschneide-Funkerosionsmaschine besonders geeignet macht.From the EP 0 196 544 A1 a vise is described with a bed over which a first fixed, a first clamping plate having jaw rises, and with a second, movably guided on the bed, a second clamping plate having jaw, which is rotatably connected to a spindle rotatably mounted on the bed, wherein the spindle extends in a longitudinal channel formed in the bed, and is included in the longitudinal channel of the foot of the second clamping jaw, which is connected via a captured in a longitudinal slot of the bed neck with the second clamping plate. For exact positioning of a workpiece clamped between the clamping jaws, it is provided that the bed has a planar reference surface extending transversely to the clamping plates and between them, that at least two adjacent clamping surfaces extending in the direction of the reference surface are formed on the bed, of which a first Clamping surface is inclined relative to the reference surface and the second clamping surface is inclined relative to the reference surface in opposite directions, and that at least two clamping surfaces adjacent clamping surfaces are formed on the second clamping jaw, of which the first clamping surface parallel to the first clamping surface and the second clamping surface parallel to the second Clamping surface extends. As a result, a very narrow design of the vise is made possible, which makes it particularly suitable for use on a wire-cut spark erosion machine.

Eine weitere Einspannvorrichtung ist in der EP 0 362 753 offenbart. Sie dient zum Halten von Werkstücken und weist dazu im Abstand relativ zueinander verstellbare Spannbacken auf, die zueinander weisende Spannflächen haben. Ausserdem ist eine Werkstück-Auflage vorhanden. Es ist bei der oder den Spannflächen der Spannbacken eine vom einzuspannenden Werkstück verstellbare und in Spannrichtung beaufschlagbare Niederzugvorrichtung vorgesehen. Diese weist ein über die Spannfläche überstehendes und schräg zu der Werkstück-Auflage hinweisendes Niederzugelement auf. Während des Spannvorganges wird dieses Niederzugelement beaufschlagt und schwenkt dabei schräg nach unten in Richtung zu der Werkstück-Auflage, wobei das Werkstück entweder mitgenommen wird oder aber in diese Richtung kraftbeaufschlagt wird, so dass eine sichere Anlage auf der Auflage erfolgt.Another jig is in the EP 0 362 753 disclosed. It serves to hold workpieces and has at a distance relative to each other adjustable Clamping jaws, which have mutually facing clamping surfaces. In addition, a workpiece support is available. It is provided at the one or more clamping surfaces of the clamping jaws adjustable from the workpiece to be clamped and acted in the clamping direction pull-down device. This has a over the clamping surface protruding and obliquely to the workpiece support hinweisendes pull-down. During the clamping process, this pull-down element is acted upon and pivots obliquely downwards in the direction of the workpiece support, wherein the workpiece is either taken along or is subjected to force in this direction, so that a secure abutment takes place on the support.

Die deutsche Offenlegungsschrift DE 43 41 744 A1 zeigt ein Tiefziehspann-System für Spannvorrichtungen an Werkstückbearbeitungsmaschinen, bestehend aus zwei gegenüberliegenden Teilen, einem Anschlag - Tiefziehspanner mit festen Spannbacken und einem Tiefziehspanner mit beweglichen Spannbacken, zwischen denen das zu bearbeitende Werkstück eingespannt ist, wobei ein Anschlag-Tiefziehspanner als ortsfestes Anschlagteil vorhanden ist, welcher aus einem Backenkörper besteht, der auf einer Halteplatte angeordnet ist, wobei der Backenkörper zum Einspannen eines Werkstückes mit Schutzbacken ausgerüstet ist, die eine vertikale Spannfläche zur Halteplatte besitzt, wobei der Backenkörper an einer Auflage anliegt und mit einem elastisch verbiegbaren Teil gegenüber der Halteplatte und eine Formgebung besitzt, wodurch bei Einwirkung einer parallel zur Halteplatte wirkende Schubkraft über die Schutzbacken eine auf die Halteplatte gerichtete Kraft, die größer als die Hebekraft ist, auf das Werkstück übertragen wird.The German Offenlegungsschrift DE 43 41 744 A1 shows a thermoforming system for clamping devices on workpiece processing machines, consisting of two opposing parts, a stop - thermoforming clamp with fixed jaws and a thermoformer with movable jaws, between which the workpiece to be machined is clamped, with a stop thermoforming clamp is present as a stationary stop member which consists of a jaw body which is arranged on a holding plate, wherein the jaw body is equipped for clamping a workpiece with protective jaws, which has a vertical clamping surface to the holding plate, wherein the jaw body rests against a support and with an elastically bendable part relative to the holding plate and has a shape, whereby upon application of a force acting parallel to the holding plate thrust force on the protective jaws on the holding plate directed force, which is greater than the lifting force is transmitted to the workpiece.

Eine Hauptforderung für ein optimales Spannsystem ist eine Einspannung eines Werkstückes, welches sich beim Einspannen und im eingespannten Zustand nicht von dem Schraubstockbett weg bewegen darf. Beispielsweise wird in Drahterosionsmaschinen während der Bearbeitung das Werkstück von fliessendem Wasser bis zu Drücken von 100 bar beaufschlagt, um Späne oder Abfallmaterial wegzuspülen. Dies kann zu Vibrationen des eingespannten Werkstückes führen, die sich auf die genaue Einspannung des Werkstückes negativ auswirken kann. Das Problem beim Stand der Technik ist, dass die geforderte Festigkeit beim Einspannen eines Werkzeuges aufgrund von anspruchsvolleren Anforderungen an die Anwendung nicht erreicht wird. Die Werkstücke werden beispielsweise grösser, so dass eine Einspannvorrichtung der vorliegenden Art die Fähigkeit haben muss, auch Werkstücke, die relativ gross zu der Grösse des Einspannwerkzeuges ist, optimal einspannen zu können. Beispielsweise haben Drahterosionmaschinen höhere Arbeitsgeschwindigkeiten. Dies erfordert höhere Wasserdrücke zum Abtransport der anfallenden Späne, was wiederum eine höhere Belastung auf das Werkstück zur Folge hat.A main requirement for an optimal clamping system is a clamping of a workpiece, which must not move away from the vise bed during clamping and in the clamped state. For example, in wire EDM machines, the workpiece is exposed to flowing water up to pressures of 100 bar during operation to flush away chips or waste material. This can lead to vibrations of the clamped workpiece, which can negatively affect the exact clamping of the workpiece. The problem with the prior art is that the required strength when clamping a tool is not achieved due to more demanding application requirements. The workpieces become larger, for example, so that a Clamping device of the present type must have the ability to workpieces, which is relatively large to the size of the clamping tool to clamp optimally. For example, wire erosion machines have higher working speeds. This requires higher water pressures for the removal of the resulting chips, which in turn has a higher load on the workpiece result.

Ein weiterer Nachteil ist der Einsatz von überstehenden Werkstücken aufgrund von zu geringer Belastungsmöglichkeit. Ein herausstehendes Werkstück erzeugt ein gewisses Biegemoment, welches die Einspannkraft negativ belasten kann.Another disadvantage is the use of protruding workpieces due to low load possibility. A protruding workpiece generates a certain bending moment, which can negatively burden the clamping force.

Für eine Bedienperson kann es von körperlichem Nachteil (Belastung der Gelenke und Muskeln) sein, wenn beispielsweise der Schraubstock mittels eines Schraubenschlüssels vielmals hintereinander manuell bedient werden muss.For an operator, it can be of physical disadvantage (stress on the joints and muscles), for example, if the vise must be manually operated by means of a wrench many times in succession.

Somit ist es die Aufgabe der Erfindung alle diese Nachteile zu vermeiden, nämlich die Einspannkraft bei gleicher Bedienkraft in Richtung Schraubstockbett und die Einspannfestigkeit zu vergrössern.Thus, it is the object of the invention to avoid all these disadvantages, namely to increase the clamping force with the same operating force towards the vise bed and the clamping strength.

Erfindungsgemäss wird die Erfindung dadurch gelöst, dass die Spannkraft der Spannplatte auf das eingespannte Werkstück entlang der zum Werkstück gerichteten Oberfläche variabel ist.According to the invention, the invention is achieved in that the clamping force of the clamping plate is variable on the clamped workpiece along the surface facing the workpiece.

Durch die variable Spannkraft der Spannbacken wird eine Erhöhung des Drehmomentes erreicht, indem bevorzugt die resultierende Spannkraft oberhalb der Mitte der Oberfläche der Spannplatte liegt.Due to the variable clamping force of the clamping jaws, an increase in the torque is achieved by preferably the resulting clamping force is above the center of the surface of the clamping plate.

Gemäss einer weiteren Ausgestaltung der Erfindung weist die Spannplatte eine äussere und eine innere Brücke auf.According to a further embodiment of the invention, the clamping plate has an outer and an inner bridge.

Weiterhin kann die äussere und innere Brücke in Spannungsrichtung elastisch federnd sein, wobei die Federkonstante der inneren Brücke kleiner als die Federkonstante der äusseren Brücke ist.Furthermore, the outer and inner bridge may be elastically resilient in the tension direction, wherein the spring constant of the inner bridge is smaller than the spring constant of the outer bridge.

Gemäss den Unteransprüchen sind die Brücken gekrümmt, wobei die Krümmungsradien der beiden Brücken unterschiedlich sein können.According to the subclaims, the bridges are curved, wherein the radii of curvature of the two bridges can be different.

Beispielsweise weist die innere Brücke eine grössere Krümmung auf als die äussere Brücke.For example, the inner bridge has a greater curvature than the outer bridge.

Durch eine oder mehrerer dieser Massnahmen wird eine Verlagerung des Angriffspunktes der Spannkraft parallel zum Schraubstockbett erzielt mit der Folge einer Vergrösserung des Drehmomentes, welches auf das Werkstück wirkt. Infolgedessen wird die Festigkeit der Einspannung in Richtung senkrecht zum Schraubstockbett vergrössert. Das wesentliche Merkmal ist die Erreichung einer maximalen Belastbarkeit. Die Belastbarkeit ist durch das maximale Biegemoment gegeben, welches eine Funktion der resultierenden Kräfte auf das Werkstück ist. Die Belastbarkeit wird mit dieser Erfindung wesentlich vergrössert.By one or more of these measures, a displacement of the point of application of the clamping force is achieved in parallel to the vise bed with the result of an increase in the torque which acts on the workpiece. As a result, the strength of the clamping in the direction perpendicular to the vise bed is increased. The essential feature is the achievement of a maximum load capacity. The load capacity is given by the maximum bending moment, which is a function of the resulting forces on the workpiece. The load capacity is significantly increased with this invention.

Weiterhin wird das erforderliche Drehmoment, welches die Bedienperson aufwenden muss, verringert, um die gleiche Belastung wie nach dem Stand der Technik zu erzielen. Dies dient der Gesundheit der Bedienperson.Furthermore, the required torque which the operator must expend is reduced to achieve the same load as in the prior art. This is for the health of the operator.

Gemäss einer bevorzugten Ausführungsform ist die innere Brücke S-förmig ausgestaltet. Die Erfindung ist nicht auf die S-förmige Ausgestaltung der Brücke beschränkt. Alle denkbaren Formen, die zum Ziel einer Erhöhung der Spannkraft und Belastbarkeit führen sind denkbar.According to a preferred embodiment, the inner bridge is configured S-shaped. The invention is not limited to the S-shaped configuration of the bridge. All conceivable forms that lead to the goal of increasing the clamping force and load capacity are conceivable.

Erfindungsgemäss kann die Spannbacke zwischen den Brücken einen Hohlraum aufweisen, wobei die Krümmungen des Hohlraumes zur Vermeidung von Überbelastungen entsprechend ausgebildet sind.According to the invention, the clamping jaw between the bridges have a cavity, wherein the curvatures of the cavity are designed to avoid overloading.

Weiterhin kann die Spannbacke unterhalb der inneren Brücke einen gekrümmten Schlitz zur Vermeidung von Überbelastungen aufweisen.Furthermore, the jaw below the inner bridge may have a curved slot to avoid overloading.

Der Schlitz dient als Sicherheit für Überlastungen des Spannwerkzeuges. Die Schlitzbreite ist ein geometrisches Mass für die maximal erlaubte Belastung.The slot serves as security for overloading the clamping tool. The slot width is a geometric measure for the maximum allowable load.

Nachstehend ist die Erfindung anhand eines Ausführungsbeispiels beschrieben. Es zeigen:

Fig.1
einen Schraubstock nach dem Stand der Technik
Fig. 2
eine Seitenansicht eines Schraubstocks
Fig. 3
eine dreidimensionale Ansicht einer Spannbacke
Fig. 4
eine Seitenansicht einer Spannbacke
Fig. 5a
die Kräfteverhältnisse im Stand der Technik
Fig. 5b
die Kräfteverhältnisse gemäss der Erfindung
The invention is described below with reference to an embodiment. Show it:
Fig.1
a vise according to the prior art
Fig. 2
a side view of a vise
Fig. 3
a three-dimensional view of a jaw
Fig. 4
a side view of a jaw
Fig. 5a
the balance of power in the prior art
Fig. 5b
the balance of power according to the invention

In der Figur 1 ist ein Schraubstock 2 mit nach dem Stand der Technik bekannten Spannbacken 11 und 12 in dreidimensionaler Darstellung gezeigt. Die Spannbacke 11 ist einstückig mit dem Schraubstockkörper 13 fest verbunden. Im Schraubstockkörper 13 sind Bohrungen 14 für die Befestigung in an sich bekannter Weise an einen Arbeitstisch vorgesehen. Auf der Seite der festen Spannbacke 11 ist das Schraubstockbett 15 angeordnet, auf dem das in Figur 2 gezeigte Werkstück 6 aufgespannt wird. Unterhalb des Schraubstockbettes 15 ist im Innern des Schraubstockkörpers 13 eine Spindelanordnung 16 installiert. Die Spindelanordnung 16 besteht in üblicher Weise aus einer Spindel 22, die auf der einen Seite des Schraubstockkörpers 13 mittels einer Mutter 17 gesichert und auf der anderen Seite durch einen drehbaren Griff 18 zur Betätigung der Spindel 22 abgeschlossen ist. Mit der Spindel 22 wird eine im Schraubstockkörper 13 geführte Spannbacke 12 zum Einspannen eines Werkstückes 6 zwischen den Spannbacken 11 und 12 bewegt. Die Spannbacken 11 und 12 weisen gemäss des Standes der Technik zwei Brücken 19 und 20 auf. Zwischen den Brücken 19 und 20 ist ein parallelgrammförmiger Hohlraum 21 gezeigt.FIG. 1 shows a vice 2 with clamping jaws 11 and 12 known from the prior art in a three-dimensional representation. The jaw 11 is integral with the vise body 13 fixedly connected. In the vice body 13 holes 14 are provided for attachment in a conventional manner to a work table. On the side of the fixed jaw 11, the vise bed 15 is arranged, on which the workpiece 6 shown in Figure 2 is clamped. Below the vise bed 15, a spindle assembly 16 is installed inside the vise body 13. The spindle assembly 16 consists in a conventional manner of a spindle 22 which is secured on one side of the vice body 13 by means of a nut 17 and on the other side by a rotatable handle 18 for actuating the spindle 22 is completed. With the spindle 22, a guided in the vice body 13 jaw 12 for clamping a workpiece 6 between the clamping jaws 11 and 12 is moved. The jaws 11 and 12 according to the prior art, two bridges 19 and 20. Between the bridges 19 and 20, a parallelogram-shaped cavity 21 is shown.

Die Figur 2 zeigt die Seitenansicht eines Schraubstockes mit einer beispielhaften Ausführungsform der Spannbacken 1. In die Spannbacken 1 ist ein Werkstück 6 eingespannt. Die Bezugszeichen in Figur 2 entsprechen den Bezugszeichen in Figur 1.2 shows the side view of a vise with an exemplary embodiment of the clamping jaws 1. In the jaws 1, a workpiece 6 is clamped. The reference symbols in FIG. 2 correspond to the reference symbols in FIG. 1.

In Figur 3 ist eine Spannbacke 1, die auf einer Führung 23 beweglich gehalten ist, in dreidimensionaler Ansicht gezeigt.In FIG. 3, a clamping jaw 1, which is held movably on a guide 23, is shown in a three-dimensional view.

Eine mögliche Ausgestaltung einer Spannbacke 1 ist der Seitenansicht in Figur 4 zu entnehmen. Die Spannbacke 1 weist eine Spannplatte 3 mit der zum Werkstück 6 gerichteten Oberfläche 7 auf. Ferner sind in der Spannbacke 1 eine äussere und eine innere Brücke 4 und 5 angeordnet. Der Verlauf der inneren und äusseren Brücke 4 und 5 ist nicht parallel. Die innere Brücke 5 ist mehr gekrümmt als die äussere Brücke 4, um eine geringere Steifigkeit zu erreichen. Aufgrund der so erzielten Federeigenschaften ist es möglich, einen vollflächigen Kontakt der Oberfläche 7 der Spannplatte 3 mit dem Werkstück 6 zu erreichen. Die Kräfteverhältnisse im eingespannten Zustand wird in den Figuren 5a und 5b näher beschrieben. Die hier gezeigte Ausführungsform zeigt eine bogenförmig geformte äussere Brücke 4 und eine S-förmige innere Brücke 5. Der von den Brücken 4 und 5 eingeschlossene Hohlraum 8 ist mit derartigen Krümmungen 9 versehen, dass eine Überbelastung der Spannbacken verhindert wird. Weiterhin ist als Überlastschutz ein gekrümmter, beispielsweise S-förmigen Schlitz 10 zwischen dem Schraubstockbett 15 und der inneren Brücke 5 vorgesehen. Die durch den Schlitz 10 gebildete Spaltbreite wird zu Null, wenn der beim Einspannen entstehende Drehmoment zu hoch werden würde.A possible embodiment of a clamping jaw 1 is shown in the side view in Figure 4. The clamping jaw 1 has a clamping plate 3 with the workpiece 6 facing surface 7. Further, in the clamping jaw 1, an outer and an inner bridge 4 and 5 are arranged. The course of the inner and outer bridge 4 and 5 is not parallel. The inner bridge 5 is more curved than the outer bridge 4 in order to achieve a lower rigidity. Due to the spring properties thus obtained, it is possible to achieve a full-surface contact of the surface 7 of the clamping plate 3 with the workpiece 6. The force relationships in the clamped state is described in more detail in FIGS. 5a and 5b. The embodiment shown here shows an arcuately shaped outer bridge 4 and an S-shaped inner bridge 5. The cavity 8 enclosed by the bridges 4 and 5 is provided with such curvatures 9 that an overstressing of the clamping jaws is prevented. Furthermore, a curved, for example S-shaped slot 10 between the vise bed 15 and the inner bridge 5 is provided as overload protection. The gap width formed by the slot 10 becomes zero if the torque produced during clamping would become too high.

Ein Vergleich der Kräfteverhältnisse im eingespannten Zustand zwischen einer bekannten Spannbacke und einer beispielhaften erfindungsgemässen Spannbacke zeigen die Figuren 5a und 5b.A comparison of the balance of forces in the clamped state between a known clamping jaw and an exemplary clamping jaw according to the invention is shown in FIGS. 5a and 5b.

Die Figur 5a zeigt die Situation nach dem Stand der Technik. Die beiden Brücken 19 und 20 schliessen als Hohlraum 21 ein Parallelogramm ein. Die Spannkraft K ist über die gesamte Oberfläche 24 der Spannebene 25 konstant. Die resultierende Kraft Kr greift in der Mitte M der Spannebene 25 an, so dass sich ein Drehmoment Dm1, gebildet aus der resultierenden Kraft Kr und dem Abstand L1. ergibt.FIG. 5a shows the situation according to the prior art. The two bridges 19 and 20 include as cavity 21 a parallelogram. The clamping force K is constant over the entire surface 24 of the clamping plane 25. The resulting force K r engages in the middle M of the clamping plane 25, so that a torque D m1 , formed from the resultant force K r and the distance L 1 . results.

Anders ist der Kraftfluss bei der Erfindung, dargestellt am Beispiel in Figur 5b. Infolge der speziell gekrümmten Brücken 4 und 5 nehmen die Spannkräfte K von oben nach unten ab. Der Angriffspunkt der resultierenden Kraft Kr liegt oberhalb der Mitte M der Oberfläche 7 der Spannplatte 3. Damit wird der Abstand L2 grösser als der Abstand L1 in Figur 5a. Folglich vergrössert sich das Drehmoment Dm2 gegenüber dem Drehmoment Dm1 gegenüber dem Stand der Technik. Wesentlich ist die Erreichung eines maximalen Biegemomentes, welches sich aus den Kräften Kr und F2 multipliziert mit dem Arm L2 ergibt. Das Werkstück wird durch Friktion in der kritischen Biegerichtung gehalten. Die Biegefestigkeit ist wesentlich von der Länge L2 abhängig.The force flow in the invention is different, represented by the example in FIG. 5b. Due to the specially curved bridges 4 and 5, the clamping forces K decrease from top to bottom. The point of application of the resulting force K r is above the center M of the surface 7 of the clamping plate 3. Thus, the distance L 2 is greater than the distance L 1 in Figure 5a. Consequently, the torque D m2 increases over the torque D m1 over the prior art. Essential is the achievement of a maximum bending moment, which results from the forces K r and F 2 multiplied by the arm L 2 . The workpiece is held in the critical bending direction by friction. The flexural strength is significantly dependent on the length L 2 .

Der Vergleich der Kräfteverteilung von Figur 5a mit dem der Figur 5b zeigt, dass die zum Schraubstockbett 15 gerichtete Kraft F2 in Figur 5b grösser ist als die Kraft F1 in Figur 5a. Damit wird das Werkstück 6 bei dem erfindungsgemässen Beispiel stärker nach unten gezogen und fester gehalten, was ein wesentliches Ziel der Erfindung ist.The comparison of the force distribution of FIG. 5a with that of FIG. 5b shows that the force F 2 directed towards the vice bed 15 in FIG. 5 b is greater than the force F 1 in FIG. 5 a. Thus, the workpiece 6 is pulled in the example according to the invention more strongly down and held, which is an essential objective of the invention.

Die Erfindung ist nicht auf die in den Figuren gezeigten gekrümmten Formen der Brücken und des Schlitzes beschränkt. Wesentlich ist eine solche Geometrie zu finden, die in einer höheren Kraft in Richtung Schraubstockbett gegenüber dem Stand der Technik mit geraden und parallelen geometrischen Eigenschaften resultiert.The invention is not limited to the curved shapes of the bridges and the slot shown in the figures. It is essential to find such a geometry, which results in a higher force in the direction of the vice bed compared to the prior art with straight and parallel geometric properties.

Die mit der Erfindung verbundenen Vorteile bestehen insbesondere darin, durch eine geeignete Form der Spannbacken eine grössere Belastbarkeit und eine grössere Spannkraft bei gleichem Bediendrehmoment zu erreichen. Für eine Bedienperson ist die Handhabung des Schraubstocks mit den erfindungsgemässen Spannbacken weniger belastbar für ihre Gelenke und Muskeln.The advantages associated with the invention are in particular to achieve a greater load capacity and a greater clamping force at the same operating torque by a suitable shape of the clamping jaws. For an operator, the handling of the vise with the inventive jaws less resilient to their joints and muscles.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Spannbackejaw
22
Schraubstockvice
33
Spannplattechipboard
44
Brückebridge
55
Brückebridge
66
Werkstückworkpiece
77
Oberfläche von 3Surface of 3
88th
Hohlraumcavity
99
Krümmungcurvature
1010
Schlitzslot
1111
Spannbackejaw
1212
Spannbackejaw
1313
Schraubstockkörpervice body
1414
Bohrungendrilling
1515
Schraubstockbettvise bed
1616
Spindelanordnungspindle assembly
1717
Muttermother
1818
GriffHandle
1919
Brückebridge
2020
Brückebridge
2121
Hohlraumcavity
2222
Spindelspindle
2323
Führungguide
2424
Oberflächesurface
2525
Spannebenenclamping planes
KK
Kraftforce
Kr K r
resultierende Kraftresulting power
MM
Mittecenter
Dm1 D m1
Drehmomenttorque
Dm2 D m2
Drehmomenttorque
L1 L 1
Abstanddistance
L2 L 2
Abstanddistance
F1 F 1
Kraftforce
F2 F 2
Kraftforce

Claims (10)

Spannbacke (1) für einen Schraubstock (2) mit einer Spannplatte (3) und mindestens zwei Brücken (4, 5), dadurch gekennzeichnet, dass die Spannkraft K der Spannplatte (3) auf das eingespannte Werkstück (6) entlang der zum Werkstück (6) gerichteten Oberfläche (7) variabel ist.Clamping jaw (1) for a vice (2) with a clamping plate (3) and at least two bridges (4, 5), characterized in that the clamping force K of the clamping plate (3) on the clamped workpiece (6) along the workpiece ( 6) directed surface (7) is variable. Spannbacke (1) nach Anspruch 1, dadurch gekennzeichnet, dass die resultierende Spannkraft Kr oberhalb der Mitte M der Oberfläche (7) der Spannplatte (3) liegt.Clamping jaw (1) according to claim 1, characterized in that the resulting clamping force K r above the center M of the surface (7) of the clamping plate (3). Spannbacke (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Spannplatte (3) eine äussere (4) und eine innere Brücke (5) aufweist.Clamping jaw (1) according to claim 1 or 2, characterized in that the clamping plate (3) has an outer (4) and an inner bridge (5). Spannbacke (1) nach mindestens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die äussere (4) und innere Brücke (5) elastisch federnd sind, wobei die Federkonstante der inneren Brücke (5) kleiner ist als die Federkonstante der äusseren Brücke (4).Clamping jaw (1) according to at least one of claims 1 to 3, characterized in that the outer (4) and inner bridge (5) are elastically resilient, wherein the spring constant of the inner bridge (5) is smaller than the spring constant of the outer bridge (5). 4). Spannbacke (1) nach mindestens einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Brücken (4, 5) gekrümmt sind.Clamping jaw (1) according to at least one of the preceding claims, characterized in that the bridges (4, 5) are curved. Spannbacke (1) nach mindestens einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Brücken (4, 5) unterschiedlich gekrümmt sind.Clamping jaw (1) according to at least one of the preceding claims, characterized in that the bridges (4, 5) are curved differently. Spannbacke (1) nach mindestens einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die innere Brücke (5) eine grössere Krümmung aufweist als die äussere Brücke (4).Clamping jaw (1) according to at least one of the preceding claims, characterized in that the inner bridge (5) has a greater curvature than the outer bridge (4). Spannbacke (1) nach mindestens einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass innere Brücke (5) S-förmig ist.Clamping jaw (1) according to at least one of the preceding claims, characterized in that inner bridge (5) is S-shaped. Spannbacke (1) nach mindestens einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Spannbacke (1) zwischen den Brücken (4, 5) einen Hohlraum (8) aufweist, wobei die Krümmungen (9) des Hohlraumes (8) zur Vermeidung von Überbelastungen entsprechen ausgebildet sind.Clamping jaw (1) according to at least one of the preceding claims, characterized in that the clamping jaw (1) between the bridges (4, 5) has a cavity (8), wherein the curvatures (9) of the cavity (8) to avoid overloading are formed accordingly. Spannbacke (1) nach mindestens einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Spannbacke (1) unterhalb der inneren Brücke (5) einen gekrümmten Schlitz (10) zur Vermeidung von Überbelastungen aufweist.Clamping jaw (1) according to at least one of the preceding claims, characterized in that the clamping jaw (1) below the inner bridge (5) has a curved slot (10) to avoid overloading.
EP05019409A 2005-09-07 2005-09-07 Flexible vice jaw Active EP1762339B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP05019409A EP1762339B1 (en) 2005-09-07 2005-09-07 Flexible vice jaw
DE502005011222T DE502005011222D1 (en) 2005-09-07 2005-09-07 Flexible jaw for a vice
AT05019409T ATE504395T1 (en) 2005-09-07 2005-09-07 FLEXIBLE CLAMPING JAW FOR A VICE
US12/065,329 US20080197554A1 (en) 2005-09-07 2006-06-10 Flexible Clamping Jaw for a Vise
KR1020087003666A KR20080036605A (en) 2005-09-07 2006-06-10 Flexible clamping jaw for a vise
JP2008529479A JP2009506901A (en) 2005-09-07 2006-06-10 Flexible clamp jaw for vise
CN200680032223XA CN101257998B (en) 2005-09-07 2006-06-10 Flexible clamping jaw for a vise
PCT/EP2006/005585 WO2007028431A1 (en) 2005-09-07 2006-06-10 Flexible clamping jaw for a vise
IL187791A IL187791A0 (en) 2005-09-07 2007-11-29 Flexible clamping jaw for a vise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05019409A EP1762339B1 (en) 2005-09-07 2005-09-07 Flexible vice jaw

Publications (2)

Publication Number Publication Date
EP1762339A1 true EP1762339A1 (en) 2007-03-14
EP1762339B1 EP1762339B1 (en) 2011-04-06

Family

ID=35708573

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05019409A Active EP1762339B1 (en) 2005-09-07 2005-09-07 Flexible vice jaw

Country Status (9)

Country Link
US (1) US20080197554A1 (en)
EP (1) EP1762339B1 (en)
JP (1) JP2009506901A (en)
KR (1) KR20080036605A (en)
CN (1) CN101257998B (en)
AT (1) ATE504395T1 (en)
DE (1) DE502005011222D1 (en)
IL (1) IL187791A0 (en)
WO (1) WO2007028431A1 (en)

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DE102015224607A1 (en) * 2015-12-08 2017-06-08 Siemens Aktiengesellschaft jaw
DE102018214220A1 (en) * 2018-08-22 2020-02-27 Michael Adam Clamping device for wire erosion and use of a clamping device for wire erosion
DE102022109309B3 (en) 2022-04-14 2023-05-04 Rüdiger Schenke pull-down clamps

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CN102152141B (en) * 2010-02-11 2015-02-11 创研精密股份有限公司 Fixture
CA3128558C (en) 2013-04-03 2023-09-26 Affinity Tool Works, Llc Straight edge clamp
US9975221B2 (en) 2014-04-03 2018-05-22 Affinity Tool Works, Llc Hinged straight edge clamp
DE102015103531B3 (en) * 2015-03-11 2016-08-04 Helmholtz-Zentrum Berlin Für Materialien Und Energie Gmbh Hold-down clamps
CN106335013A (en) * 2016-10-19 2017-01-18 中航飞机股份有限公司西安飞机分公司 Flexible vice clamp
DE102017121286C5 (en) 2017-09-14 2023-06-22 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik clamping jaw

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DE102015224607A1 (en) * 2015-12-08 2017-06-08 Siemens Aktiengesellschaft jaw
DE102018214220A1 (en) * 2018-08-22 2020-02-27 Michael Adam Clamping device for wire erosion and use of a clamping device for wire erosion
DE102022109309B3 (en) 2022-04-14 2023-05-04 Rüdiger Schenke pull-down clamps

Also Published As

Publication number Publication date
CN101257998B (en) 2012-04-18
DE502005011222D1 (en) 2011-05-19
KR20080036605A (en) 2008-04-28
ATE504395T1 (en) 2011-04-15
IL187791A0 (en) 2008-08-07
JP2009506901A (en) 2009-02-19
EP1762339B1 (en) 2011-04-06
US20080197554A1 (en) 2008-08-21
CN101257998A (en) 2008-09-03
WO2007028431A1 (en) 2007-03-15

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