EP2001638B1 - Clamping device - Google Patents

Abstract

The invention relates to a clamping device (54) for clamping a workpiece in place relative to a clamping table. The clamping device according to the invention is of three-piece design, with a support (1) which can be restrained together with a clamping table (4) via a fastening screw (44). A guide shoe (14) is displaceable relative to the support (1) in the direction of a longitudinal axis (2-2). The guide shoe has legs, which are each arranged outside both the support (1) and a pivoted lever (35). Extensions (42) of the clamping lever (35) pass through bearing lugs of the legs to permit a pivoting movement of the clamping lever (35). The clamping lever (35) together with the extensions (42) forms a construction unit which can be inserted as such into the guide shoe (14) in the direction of the longitudinal axis (2-2), thereby providing for simple assembly.

Description

The invention relates to a clamping device for clamping an object, for example a workpiece, relative to a base body, for example a clamping table, according to the preamble of claim 1. Such a tensioning device is known from the document EP 0 714 734 B known.

TECHNICAL FIELD OF THE INVENTION

Clamping devices of the kind relevant here are used, for example, in factories or manufacturing plants, in order to keep a workpiece in a defined position when machining forces are applied to a base body. An exemplary further use of tensioning devices are test laboratories, such as vibration laboratories or the like. Also possible is the use in the field of production of workpieces, for example, an injection mold can be clamped on a clamping device on a clamping table. In summary, the clamping device according to the invention can be used in any technical fields of application in which an easily provided and releasable fixation of an object with respect to a body of interest, with a broad interpretation of the terms "object" and "body" without a mandatory restriction of the same to "workpieces" and a "(clamping) table" should take place.

STATE OF THE ART

With regard to a construction of known tensioning devices, the following basic forms are to be distinguished:

For hereinafter referred to as " one-piece design " embodiments, s. for example. US 4,470,586 , A base body has a groove with a T-shaped cross-section. One in one Side view simplified as a T-shaped clamping lever has in the free end region of the vertical leg of the T an axle body, which is insertable to form a displaceable in the direction of the longitudinal axis of the T-slot pivot axis in the T-groove. Through an end portion of the transverse leg of the T extends an actuating element formed as a screw, the end face of which is supported in a bottom of the T-slot. As the screw is screwed into the clamping lever, it is pivoted about a pivot axis predetermined by the axle body in such a way that the opposite end area of the transverse leg approaches the clamping table and a workpiece can be clamped between this end area and the clamping table. Thus, in addition to a clamping table with said T-slot for the formation of the clamping device, only one component, namely the clamping lever required

For a design referred to below as a "two-part design", cf. for example. EP 0 391 346 B1 , Between carrier and clamping table a carrier is interposed, which is screwed, for example, in any position and orientation with a sliding block of a clamping table. Notwithstanding the one-piece design of the axle body of the clamping lever is not stored in the T-slot of the clamping table, but rather in a T-slot of the carrier. The essential parts of the two-part design are thus the carrier and the clamping lever.

For a hereinafter referred to as "three-part design" embodiment, s. for example. EP 0 714 734 B1 the clamping device has a carrier which is firmly connected to the clamping table. Compared to the carrier, a guide shoe is displaceable in the direction of a longitudinal axis in that the carrier has a longitudinal recess, for example a T-groove, in which a T-shaped cross section of the guide shoe is inserted. The guide shoe has a bearing eye with a partially cylindrical lateral surface with a circumferential angle of approximately 180 °. A clamping lever has between an actuator designed as a screw and a contact surface, which is arranged in the actuating element opposite end portion, an axis oriented transversely to the longitudinal axis of the axle body, which is used in the direction of the longitudinal axis in the T-slot of the carrier and the bearing eye such that the axle body is mounted on the lateral surface to form a pivot axis. For such a three-part design with the essential components carrier, guide shoe and clamping lever, a position and an orientation of the longitudinal axis can first be specified via the attachment of the carrier to the clamping table, which is independent of holes, threads, recesses and grooves of a clamping table. Another Degree of freedom in the direction of the longitudinal axis is given by the Längsverschiebtichkeit the guide shoe relative to the carrier, which does not necessarily have to be set for operation of the clamping device, so that for operation of the clamping device, a simple change in the position of the clamping lever in the direction of the longitudinal axis using the degree of freedom given is. Furthermore, it is possible, with a correspondingly extended guidance of the guide shoe relative to the carrier, to allow the guide shoe, in particular also the region of the bearing eye, to "project" out of the carrier so that the guide shoe and carrier are "telescopic". As a result, the application range of the clamping device on the clamping table can be increased and / or made possible that the distance of the exercise of a clamping force can be increased to a workpiece from the mounting location of the clamping device on the clamping table, which brings improved clamping options with it.

Of course, the one-, two- or three-part designs may have additional components, without falling out of the previously discussed basic designs, such as return springs, bearing body, screws, pins and the like. Also possible are additional degrees of freedom between body and clamping lever.

FR 2 463 408 discloses mounting a support body on a chuck table to provide a base for a chuck, wherein the top of the support body is raised from the chuck table. The support body further has a T-shaped stone, with which the clamping device is connected firmly and without degrees of freedom in the direction of a longitudinal axis. The structural design of the pivot bearing of the clamping lever relative to the guide shoe is not further addressed in the document.

CH 597 976 relates to a three-part design in which the carrier with T-shaped cross-section is encompassed by the guide shoe. Above this connection region between the guide shoe and the carrier, a single vertical leg is provided which carries in a bore a fixed with a grub screw, designed as axle axle axle body. In the region of the pivot axis of the clamping lever is formed with two parallel, extending in the longitudinal direction of the clamping lever side cheeks, which have recesses for the formation of bearing eyes through which the axle shaft passes.

CH 463,244 relates to a clamping device, by means of which not a clamping in a vertical direction of a clamping table is to take place, but rather in a horizontal direction.

Further prior art is for example off DE 28 08 667 C2 . DE 4 442 803 C1 . FR 2 612 439 A1 . US 2,872,854 A . DE 30 03 626 A1 . US 1,490,063 A . US 4,432,538 A . FR 2 767 730 and DE 89 04 096 U1 known.

OBJECT OF THE INVENTION

The invention has for its object to provide a clamping device, which is improved in terms of construction costs, the installation effort and / or the disassembly effort and the mechanical stresses during clamping.

SOLUTION

The object of the invention is achieved with the features of independent claim 1. Further embodiments of the invention will become apparent according to the dependent claims 2 to 12.

DESCRIPTION OF THE INVENTION

According to the invention, a tensioning device of three-part design is used with a carrier, a guide shoe and a tensioning lever, wherein it is not excluded that other components are used which can also guarantee additional functions or degrees of freedom. The carrier is fixed to the main body, such as a clamping table, connectable and has a contact surface, which has an extension in a longitudinal direction. The use of such a carrier has the advantage that over a plurality of holes, slots or grooves or different connecting means diverse connection possibilities can be provided with a clamping table, which result in the fact that the clamping device in many positions and for a variety of alignment possibilities on the body can be attached. On the other hand, the carrier provides a contact surface in the area in which the carrier comes into operative connection with the guide shoe.

The guide shoe according to the invention is displaceable in the longitudinal direction relative to the carrier, and thus also relative to the main body or clamping table. Such a shift degree of freedom can be used to provide a further adjustment of the position of a clamping lever for already fixed carrier, for example, a fine adjustment or adaptation to different geometries or processing states of a workpiece to be clamped. Also possible is an at least temporary fixing of the degree of freedom between the guide shoe and the carrier, for example via a screw acting between the guide shoe and the carrier, which can bring about positive engagement or frictional engagement in the region of its end face of the screw. It is also conceivable to use a detent or lock between the guide shoe and the carrier to specify or define selected positions with a predetermined detent dimension of different positions in the direction of the longitudinal axis.

The guide shoe has a counter surface, which comes to rest on the contact surface of the wearer. The contact surface and counter surface limit movement of the guide shoe in a direction which is directed away from the main body, in particular in the direction of the clamping of the workpiece. Furthermore, contact surface and counter surface can provide a guide for movements corresponding to the above-described degree of freedom. Also possible by suitable design of the longitudinal extent and arrangement of contact surface and counter surface, the above-mentioned telescopic design of guide shoe and carrier. About the dimensioning of contact surface and mating surface, the acting surface pressures during a clamping of a workpiece can be specified.

A loading of the clamping lever via any actuator which is formed in the simplest case as a manually operated screw according to the aforementioned prior art, wherein in an alternative exemplary embodiment, the use of a pivot lever according to one of US 4,432,538 known embodiment as an actuating element or a hydraulic or operating with an actuator, possibly automatically controlled actuator is possible.

According to the invention, the guide shoe has legs which laterally surround the carrier and have an inwardly angled end region. These end regions form the mating surfaces, which the guide shoe against stresses in the course of tightening Secure carrier and possibly provide a leadership. This embodiment of the invention utilizes the knowledge that for a lateral encompassing a good support of the clamping device, in particular against tilting about the longitudinal axis, is given. The reason for this is that in such an embodiment, the mating surfaces have a greater distance from the longitudinal axis than may be the case with support of any T-shaped end portion of the guide shoe according to the above-mentioned prior art, in a T-slot of the wearer intervenes. Thus, acting around the longitudinal axis moments can be better absorbed.

On the other hand, the invention has recognized that, for a lateral encompassing of the carrier according to the invention, embodiments, for example correspondingly CH 597 976 in which the guide shoe has a cross-section in the form of an inverted Y, the adjacent lower leg make the connection to the carrier and the third central leg serve to support the clamping lever, are disadvantageous due to occurring elastic deformations of the guide shoe and the dimensions given by the allowable deformations The large clamping forces, which are guided in the area of the mating surfaces in the guide shoe, cause bending stresses of both the side of the carrier arranged leg and the webs, in the region of which the aforementioned two legs are brought together to the central leg, which carries the axle. Deformations resulting from such a bending stress have the disadvantage that the supporting and guiding function between abutment surface and counter surface is impaired, since the bending can lead to a slight tilting which impairs the exact, parallel alignment of the contact surfaces and thus increases surface pressures occurring. Furthermore, the bending stress leads to an altered height of the pivot axis, the u. U. must be compensated by an additional actuation of the actuator. According to the invention this knowledge is taken into account by the power flow does not extend over a central, central leg to the axle body, but over the legs themselves, which in opposite in the vertical direction CH 597 976 extend extended extent up to the pivot axis or beyond this and are not located between the cheeks of the clamping lever, but the side of the clamping lever.

For a rectilinear design of the legs between the transition region from the mating surfaces to the support region of the axle body to the legs, this means that the legs by the clamping force primarily or exclusively by a tensile force whereby the aforementioned problems of the prior art due to bending moments occurring are eliminated. Even in the case where the legs are curved or cranked, a bending moment acting on the leg can be reduced since the lever arm of the tension force in the leg is reduced because the side leg is not "centered" in the form of a central leg must be redirected.

On the other hand, a reduced dimensioning, size and a reduced weight of the clamping device can result from the inventive design, which may be due solely to the fact that the aforementioned "diversion" of the clamping force to a central central support leg according to CH 597 976 is avoided, whereby material areas are saved. In addition, below the clamping lever by the use of thighs, which are arranged laterally of the carrier and the clamping lever, resulting in free space that can be used, for example, to arrange the clamping lever with its pivot axis further down and closer to the carrier or between Carrier and clamping lever to arrange other components, such as a return spring.

Alternatively or cumulatively to the listed technical effects of features according to the invention, a further embodiment of the invention makes use of the knowledge that according to FIG FR 2 463 408 the clamping device is expensive to manufacture and assemble. Without that a manufacturing and assembly of the clamping device of this document shows in detail, this clamping device is a factory to be mounted once and not disassembled in operation assembly with clamping lever, axle body and guide shoe. For the off FR 2 463 408 known embodiment requires an assembly of the guide shoe with the clamping lever, first the insertion of the clamping lever in the guide shoe in a position in which probably an axle forming the bolt from the outside through the bearing eye of the first leg, then through the clamping lever and finally into the bearing eye of the other Schenkels must be pushed, including in the event of a presumed press-fit connection considerable assembly forces and / or heat treatments must be used up. Alternatively, additional fastening or securing elements are to be used, such as a snap ring or the like, in order to prevent the axle body from emerging again from the legs and the clamping lever during operation, which could lead to a potentially dangerous, sudden failure of the component under load. Deviating from this form according to the invention clamping lever and axle body a structural unit, for example, already may be formed at the factory or is formed in a Vormontageschritt by the user. This assembly can then be used according to the invention as a whole in the guide shoe and, if necessary, again completely removed from this. Such insertion can also be made at the factory, whereby the factory installation is simplified, or made by a user. By forming a unit with clamping lever and axle body incorrect assembly can be avoided and unintentional release of the axle from the clamping lever can be reliably prevented in a simple manner.

Allowing removal of the assembly allows replacement of the assembly in the event of damage to elements thereof. Also possible is the replacement of a clamping lever with the axle body with another clamping lever with associated axle body, the clamping lever may have, for example, a different geometry, crank and / or length for different purposes.

While an insertion of a clamping lever and an axle body as a unit under certain circumstances also for the EP 0 714 734 B1 known embodiment is possible, the inventive design enables the first time such a simplification of the assembly and removal thereof for a three-part clamping device in which the guide shoe has legs which are arranged laterally both the carrier and the clamping lever.

For an alternative embodiment of the invention, the axle body does not form a structural unit with the tension lever, but rather with the guide shoe, resulting in corresponding effects and advantages for the above-described technical effects and advantages.

In the above-described structural units, the axle body may be fixedly connected to the guide shoe or the tensioning lever, or may be mounted rotatably relative thereto. An insertion and removal of the assembly is preferably carried out by a suitable recess or groove of the guide shoe, which recess is oriented, for example, in the longitudinal direction and has an extension transverse to the longitudinal direction, which is greater than the length of the axle body.

According to a preferred embodiment of the invention, such a recess can be used multifunctional, if this serves on the one hand to use the unit and / or to remove, and on the other hand serves to let the carrier pass through the guide shoe in the assembled state of the tensioning device.

As mentioned above, the free space between the tensioning lever and an upper side of the carrier resulting from the invention can be used to arrange a spring element between an underside of the tensioning lever and an upper side of the carrier. Such a spring element can serve to pivot without appropriate action by the actuating element, the clamping lever in an initial position, which is directed in particular by the workpiece to be clamped away. On the other hand, a spring element can serve to press the axle body against a lateral surface of a bearing eye. Such a spring element used according to the invention may be any spring element, in particular a torsion spring acting about the pivot axis or a straight or curved spring acting in the circumferential direction of the tension lever, an elastomeric spring element, a bending element or the like. Preferably, the return spring is formed as a leaf spring made of a spring steel, which is screwed in one end region with the guide shoe and in another end region, possibly under bias, applied to the clamping lever or vice versa. In addition, the leaf spring can press the bearing body against the lateral surface of the bearing eye, for example in a central region of the leaf spring.

Since according to the invention free space between the top of the carrier and the underside of the clamping lever can be given, proposes a further embodiment of the clamping device according to the invention that between the underside of the clamping lever or the pivot axis and an upper side of the carrier, a gap is formed, which is smaller than 1 cm, in particular less than 0.5 cm, for example less than 0.3 cm. As a result, the overall height of the tensioning device, at least in the region of the pivot axis, can be reduced significantly compared to the embodiments known from the prior art. Under certain circumstances, such a reduction of the overall height in the region of the pivot axis also entails a reduction in the overall height in the region of the actuating element, which may result in improved operation of the actuating element and may reduce the dimensioning of the actuating element and thus its rigidity.

For a further embodiment of the invention, the clamping lever has two extensions arranged on both sides of the clamping lever, which form the axle body. These may for example be welded to the clamping lever or be introduced via a press fit into a suitable bore of the clamping lever. The extensions can then be mounted on a lateral surface of a bearing eye.

In the event that the extensions have an at least partially cylindrical surface, it may be advantageous if they come to form a pivot bearing each for abutment against an at least partially cylindrical lateral surface of a bearing eye. This results in a large, partially cylindrical contact surface between the extensions and the bearing eye, whereby a good guide during pivotal movement and an advantageous force is applied both in the extensions and in the bearing eye.

For an alternative embodiment can according to EP 0 391 346 the cross-section of the projections have a curved, in particular elliptical contour, which comes to rest on a different contour of a bearing eye, for example a straight-line contour, which may have the advantage that, with a pivoting of the tension lever, the location of the pivot axis moves, as a result of which the force relationships the clamping lever can be kept independent of the swivel angle with appropriate specification of the contour of the extensions and / or the bearing eye, cf. in detail EP 0 391 346 , It is also possible that between the extensions and this supporting contour, a further degree of freedom for a longitudinal displacement is realized.

An improved guidance of the guide shoe relative to the carrier may result if the carrier has a lateral, oriented in the direction of the longitudinal axis groove, are guided in the webs of the leg transverse to the longitudinal axis. Such a guide can be done, for example, with both directional senses in the direction of the clamping force, so that on the one hand the movement of the guide shoe away from the base body is avoided, including a boundary of the groove forms the contact surface. On the other hand, the opposite boundary surface of the groove, the position of the guide shoe in the downward direction before in the event that the guide shoe is not subjected to clamping forces. It is also possible that through the bottom of the groove a guide in a horizontal plane and transverse to the longitudinal axis of the tensioning device takes place.

While the tensioning lever can be produced particularly easily integrally with the extensions as a casting, the invention has further recognized that it is possible to manufacture the carrier and / or the guide shoe in an extrusion process, possibly with machining finishing.

A simplified operation of the clamping device results when both the actuating element and the fastening element for the attachment of the carrier to the base body have actuating surfaces for the same tool. For example, the actuator may be formed as a screw with a hexagon whose diameter corresponds to the diameter of a hexagon socket for mounting screws of the carrier to the clamping table.

Another proposal of the invention relates to the design of the carrier. For the present case of a three-part component, the invention proposes to form the carrier at least over a part of its longitudinal extent with a double-T-section, wherein the double-T-section automatically forms a groove, which are used in the sense explained above can. Furthermore, by using the double-T cross section, the area moment of inertia of the carrier can be increased, whereby unwanted deflections of the carrier can be reduced. In addition, the underlying, reverse T provides a widened compared to the prior art supporting surface of the carrier on the clamping table, so that a good support and snapshot is given.

Advantageous developments of the invention will become apparent from the claims, the description and the drawings. The advantages of features and combinations of several features mentioned in the introduction to the description are merely exemplary and may be effective as an alternative or cumulatively without the advantages necessarily being achieved by embodiments according to the invention. Further features are the drawings - in particular the illustrated geometries and the relative dimensions of several components to each other and their relative arrangement and operative connection - refer. The combination of features of different embodiments of the invention or of features of different claims is also possible deviating from the chosen relationships of the claims and is hereby stimulated. This also applies to those features which are shown in separate drawings or are mentioned in their description. These features can also vary with features Claims are combined. Likewise, in the claims listed features for further embodiments of the invention can be omitted.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

zeigt einen Träger einer Spannvorrichtung in einer teilgeschnittenen Seitenansicht.

Fig. 2

zeigt den Träger gemäß Fig 1 in einem Querschnitt II-II.

Fig. 3

zeigt einen Führungsschuh einer Spannvorrichtung in einem Halblängsschnitt III- III.

Fig. 4

zeigt den Führungsschuh gemäß Fig. 3 in einem Querschnitt IV-IV.

Fig. 5

zeigt den Führungsschuh gemäß Fig. 3 und 4 in einem Horizontalschnitt V-V.

Fig. 6

zeigt den Führungsschuh gemäß den Fig. 3 bis 5 in einer Draufsicht.

Fig. 7

zeigt einen Spannhebel einer Spannvorrichtung in einer Seitenansicht.

Fig. 8

zeigt den Spannhebel gemäß Fig. 7 in einem Querschnitt VIII-VIII.

Fig. 9

zeigt den Spannhebel gemäß Fig. 7 und 8 in einer teilgeschnittenen Draufsicht.

Fig. 10

zeigt eine Spannvorrichtung mit einem Träger, einem Führungsschuh und einem Spannhebel in montiertem Zustand in einer Seitenansicht.

Fig. 11

zeigt die Spannvorrichtung gemäß Fig. 10 in einem Querschnitt XI-XI.

Fig. 12

zeigt die Spannvorrichtung gemäß Fig. 10 und 11 in einer Draufsicht.

Fig. 13

zeigt ein Kontaktelement für einen Einsatz im Kontaktbereich zwischen Spannhebel und Werkstück in einem Querschnitt XIII-XIII.

Fig. 14

zeigt eine Ausgestaltung einer Verbindung eines Spannhebels mit einem Führungsschuh.

In the following the invention will be further explained and described with reference to preferred embodiments shown in the figures.

Fig. 1

shows a carrier of a tensioning device in a partially sectioned side view.

Fig. 2

shows the carrier according to Fig. 1 in a cross section II-II.

Fig. 3

shows a guide shoe of a tensioning device in a semi-longitudinal section III-III.

Fig. 4

shows the guide shoe according to Fig. 3 in a cross section IV-IV.

Fig. 5

shows the guide shoe according to 3 and 4 in a horizontal section VV.

Fig. 6

shows the guide shoe according to the Fig. 3 to 5 in a top view.

Fig. 7

shows a clamping lever of a clamping device in a side view.

Fig. 8

shows the cocking lever according to Fig. 7 in a cross-section VIII-VIII.

Fig. 9

shows the cocking lever according to FIGS. 7 and 8 in a partially sectioned plan view.

Fig. 10

shows a clamping device with a carrier, a guide shoe and a clamping lever in the assembled state in a side view.

Fig. 11

shows the tensioning device according to Fig. 10 in a cross section XI-XI.

Fig. 12

shows the tensioning device according to Fig. 10 and 11 in a top view.

Fig. 13

shows a contact element for use in the contact region between clamping lever and workpiece in a cross section XIII-XIII.

Fig. 14

shows an embodiment of a compound of a clamping lever with a guide shoe.

DESCRIPTION OF THE FIGURES

Fig. 1 and 2 show a carrier 1, which has a lengthened extension in the direction of a longitudinal axis 2 in relation to a groove stone which is usual for use in a clamping table. The carrier 1 has a plurality of through holes 3 distributed uniformly over its longitudinal axis, which can be provided, for example, with a counterbore in the end region facing away from a base body 4, in order to receive a head of a screw extending through the through holes 3, such that the screw is flush with an upper side 13 of the carrier 1 completes. The carrier 1 has in the region of both side surfaces corresponding grooves 5, 6, which have an approximately U-shaped cross section, in particular with rounded portions in the transition region of the base leg 7, which forms a bottom 8, to the side legs 9, 10, the contact surfaces 11, 12 form. At least in one end region may extend in the horizontal direction and transverse to the longitudinal axis of the carrier 1, a through hole or blind bore 34 or a threaded bore extending from the bottom 8 of the groove 5, preferably in the transition region to an adjacent side legs 9, 10th

Fig. 3 to 6 show a guide shoe 14. For simplicity, in the features and description of the invention, orientations such as "horizontal" and "vertical" are used for deployment of the tensioner on a chuck table with horizontal chucking surface. It is understood that for an application of the clamping device with a different orientation or different clamping devices, the orientations must be adjusted accordingly.

The guide shoe 14 is formed substantially symmetrical to a vertical longitudinal central axis and has one in the views according to FIGS. 5 and 6 recognizable horizontal U-shaped basic contour, in which the central leg of the U is formed with a widened plate 15, which extends approximately over half the longitudinal extension of the guide shoe 14. On both sides of the plate 15 are in the vertical direction up and down extending legs 16, 17 or cheeks, wherein the plate 15 is fixedly connected to the legs 16, 17, in the vertical direction approximately centrally on the legs 16, 17. The legs 16, 17 each have a bearing eye 18, 19, which are arranged in alignment with each other and transverse to the longitudinal axis 2. The bearing lugs 18, 19 have an upper curved lateral surface 20, 21. The bearing lugs 18, 19 are arranged approximately at the level of the plate 15 or slightly above it. The bearing eyes 18, 19 are closed in the circumferential direction of the legs 16, 17 limited. Between the legs 16, 17 in the direction of the longitudinal axis continuous clearance 22 is formed, which is bounded by parallel or slightly V-shaped inclined inner sides 23, 24 of the legs 16, 17.

Below the plate 15, the guide shoe forms a T-shaped groove 25 with a recess 45 formed by the transverse leg of T. The groove 25 is open at the bottom and oriented in the direction of the longitudinal axis 2. The legs 16, 17 have in the lower end portions radially inwardly angled webs 26, 27, the tops of which form mating surfaces 28, 29, with which the recess 45 is limited. The cross section of the groove 25 is formed corresponding to the cross section of the upper T of the carrier 1, so that the carrier 1 can be inserted into the groove 25, wherein the legs 16, 17 with the lower portions laterally engage around the upper half of the carrier 1 and the webs 27, 26 enter the grooves 5, 6. A horizontal guide transversely to the longitudinal axis 2 can be given by conditioning the inner end faces of the webs 26, 27 on the bottom 8 of the grooves 5, 6 or the side surfaces of the region of the carrier 1 on the inner surfaces of the legs 16, 17. A support of the guide shoe 14 can be given by conditioning the underside of the plate 15 to the top 13 of the carrier 1 or by conditioning the underside of the webs 26, 27 to the contact surface 12 of the grooves 5, 6. A movement of the guide shoe 14 relative to the carrier 1 to Above is avoided that the mating surfaces 28, 29 come to rest against the contact surfaces 11, 12.

In the area of the underside of the plate 15, a recess 30 or cutout is provided, in the region in which a spring element, not shown in the figures, can be connected to the guide shoe 14, for which purpose the guide shoe 14 has a vertically oriented, continuous threaded bore 31 in the region of the recess 30, in which a suitable screw for fixing the spring element to the guide shoe 14 can be screwed. Such a spring element presses, for example, the guide shoe upwards, so that the mating surfaces 28, 29 come to bear against the contact surfaces 12.

In the lower end region of the web 27, this has a recess or cutout 32 oriented in the direction of the longitudinal axis 2-2, which ends with a stop surface 33. A degree of freedom of movement of the guide shoe 14 relative to the carrier 1 in the direction of the longitudinal axis 2-2 is limited by the fact that a pin arranged in the bore 34, which does not necessarily have to protrude out of the groove 5 beyond the side surfaces of the carrier 1, abuts against it the stop surface 33 comes. By providing the recess 32 with stop surface 33, a "telescoping" of the guide shoe can be made possible.

In Fig. 7 to 9 a tensioning lever 35 is shown, which has two legs 36, 37, in whose connection region the pivot axis 38 is arranged. In the region of the free end region of the leg 36, this has a horizontal and transverse to the longitudinal axis oriented bore 39, which may be formed as a through hole, blind hole or threaded. In the region of the opposite end region of the leg 37, an approximately vertically oriented or in the installed state approximately perpendicular to the plate 15 oriented threaded bore 40 is provided. Cross to the drawing level according to Fig. 7 extend on both sides projections 41, 42 which have an approximately elliptical cross-section, in the lower end region of the connecting portion of the legs 36, 37 are arranged and form an axle body 50. The extensions 41, 42 have an upper abutment surface 43, which is curved.

The legs 36, 37 of the clamping lever 35 may, depending on the Krafterfordernissen and the paths to be covered in the course of a tension of a workpiece have the same or different lengths and, as Fig. 7 can be seen cranked to bring one hand, the threaded hole 40 in a desired height and on the other hand by a crank of the leg 36 to find a suitable geometry that can be particularly advantageous passed past a tool to be clamped.

10 to 12 show a clamping device 54 in the assembled state, for which the carrier 1 via a fastening screw 44 which extends through a through hole 3, for example via a sliding block, with a base 4, in particular a clamping table, is connected.

An extension of the oriented in the direction of the longitudinal axis 2-2 recess 45 of the groove 25 of the guide shoe 14 in the transverse direction is chosen to be greater than the distance from the outside Furthermore, the extent of the recess 45 in the vertical direction is greater than the dimension of the projections 41, 42 in the vertical direction. This has the consequence that it is possible to introduce a unit 51 formed by the clamping lever 35 and the projections 41, 42 through the recess 45 between the legs 16, 17 of the guide shoe 14 and in a transition region from the recess 45 to the bearing eyes 18th 19, from where the abutment surfaces 43 of the extensions 41, 42 are brought into contact with the curved lateral surfaces 20, 21 of the bearing lugs 18, 19 and are held in contact therewith, for example via the spring element. During insertion, it may therefore be necessary to bias the spring element. The introduction of the projections in the bearing eyes 18, 19 is thus initially in a movement in the longitudinal direction of the longitudinal axis 2-2 and then by moving upward in the direction of the lateral surfaces 20, 21. A disassembly is due to the curvature of the lateral surfaces 20, 21 also only by a movement of the extensions 41, 42 down possible, which would mean a movement against the clamping direction and may be accompanied by an additional loading of the spring element.

After such pre-assembly of the clamping lever 35 in the guide shoe 14, the guide shoe can be pushed onto the carrier 1 in the direction of the longitudinal axis 2-2, the carrier 1 entering the groove 25 of the guide shoe 14. Since the carrier 1 at least partially fills the recess 45 of the groove 25, the clamping lever 45 can no longer be intentionally or unintentionally removed from the guide shoe 14 as long as the carrier 1 is arranged in the guide shoe 14.

In the threaded bore 40, a threaded bolt 46 is screwed, which carries in its the base body 4 end facing a ball head 47 with a bearing plate 48 with possibly enlarged cross-section. With the screwing of the threaded bolt 46 in the threaded bore 40 of the bearing plate 48 comes to rest against the top of the plate 15. With increasing tension of a workpiece, an increasing axial force is generated in the threaded bolt 46, which acts on the clamping lever 35 and oriented counterclockwise Moment generated about the pivot axis 38, which is inclined to press the free end portion of the leg 36 in the direction of the base body 4, whereby a workpiece can be clamped between the base body and this end. To provide a defined contact surface, also for different pivoting angles of the clamping lever 35, the abovementioned end region can be a substantially U-shaped pressing element 49, cf. Fig. 13 , The contact pressure element has bores in the region of side limbs via which the pressure plate 49 can be connected pivotably about an axis predetermined by the bores to the bores 39 of the tensioning lever 35 in a manner known per se, for example via screws or pins.

The extension of the clamping lever transverse to the longitudinal axis 2-2 in the horizontal direction is selected such that the clamping lever for the assembly and disassembly described in the free space 22 can be inserted and here in the direction of the longitudinal axis 2-2 is displaced and also for the production of Contact the contact surfaces 43 with the lateral surfaces 20, 21 is movable. In the assembly position, the inner side surfaces of the legs 16, 17 form a guide for the clamping lever 35.

FIG. 14 shows an embodiment of a compound of a clamping lever with a guide shoe; in which the legs 16a, 17a are not formed with bearing eyes. Rather, extending through legs 16a, 17a in the region of a transverse bore an axle body 50a, which may be formed, for example, as a bearing pin and is fixedly connected to the legs 16a, 17a, for example via a press-fitting. In this case, the clamping lever 35a has in its lower end portion in the region of the pivot axis 38a-38a a slot 52 into which can be inserted with an assembly of the axle 50a, wherein in an assembled position, a boundary of the slot 52 in the vertical direction a contact surface for forms the axle body 50a. Furthermore, in Fig. 14 a spring element shown, as this also for in the Fig. 1 to 12 embodiment shown can be used.

LIST OF REFERENCE NUMBERS

1

carrier

2

longitudinal axis

3

Through holes

4

body

5

groove

6

groove

7

base leg

8th

ground

9

side leg

10

side leg

11

contact surface

12

contact surface

13

top

14

guide shoe

15

plate

16

leg

17

leg

18

bearing eye

19

bearing eye

20

lateral surface

21

lateral surface

22

free space

23

inside

24

inside

25

groove

26

web

27

web

28

counter surface

29

counter surface

30

recess

31

threaded hole

32

recess

33

stop surface

34

drilling

35

clamping lever

36

leg

37

leg

38

swivel axis

39

drilling

40

threaded hole

41

extension

42

extension

43

contact surface

44

fixing screw

45

recess

46

threaded bolt

47

ball head

48

contact plate

49

pressure plate

50

axle body

51

unit

52

slot

54

jig

Claims (12)

1. Device for chucking an object against a base body (4), the device having
   a supporting element (1) designed and arranged for being fixedly linked with the base body and comprising a contact surface (11) having an extension along a longitudinal axis (2-2),
   a guide shoe (14) comprising a counter contact surface (28, 29) contacting the contact surface (11) for limiting a movement of the guide shoe (14) away from the base body (4) and a chucking lever (35) which is pivotably linked with the guide shoe (14) for a pivoting movement around a pivoting axis (38) having an orientation transverse to the longitudinal axis (2-2), wherein the chucking lever (35) comprises a chucking surface (49) for chucking the object with a chucking force between the chucking surface (49) and the base body (4) and comprises an activating element, wherein the amount of activation of the activating element correlates with the pivoting movement of the chucking lever (35) and/or the change of the chucking force,
   wherein the guide shoe (14) comprises legs (16, 17) and one end region of the legs (16, 17) extends to or beyond the pivoting axis (38) and laterally of the chucking lever (35),
   characterized by
   the legs in the opposite end region laterally encompassing, surrounding or gripping the supporting element (1), the legs (16, 17) each building one of the counter contact surfaces (28, 29) in an end region angled in inner direction,
   the guide shoe (14) being displaceable or slidable during the use of the device for chucking along the longitudinal axis (2-2) relative to the base body (4),
   the chucking lever (35) and a pivot body (50) building an assembly unit wherein the assembly unit is designed and arranged for being inserted in a pivot lug (18, 19) and removed from the pivot lug (18, 19) without disassembling the assembly unit and
   the guide shoe (14) comprising a recess with an orientation along the longitudinal axis (2-2), wherein the recess is used for inserting and removing the assembly unit and wherein in the assembled state of the device for chucking (54) the supporting element (1) extends through the recess (45).
2. Device according to claim 1, wherein a return spring is interposed between a lower surface of the chucking lever (35) and an upper surface of the supporting element (1).
3. Device according to claim 1 or 2, wherein a gap built between a lower surface of the chucking lever (35) or the pivoting axis (38) and an upper surface of the supporting element (1) is smaller than 1 cm.
4. Device according to one of claims 1 to 3, wherein the chucking lever (35) comprises two protrusions (41, 42) located at both sides of the chucking lever (35) wherein the protrusions (41,42) have an orientation along the pivoting axis (38), build the pivot body (50) and are each located in a pivot lug (18, 19) of a leg (17, 18).
5. Device according to claim 4, wherein the protrusions (41, 42) each comprise contact surfaces (43) used for building a pivoting link by contacting a surface (20, 21) of a pivot lug (18, 19).
6. Device according to claim 4 or 5, wherein the protrusions (41, 42) are built as one single cast or forged part with the chucking lever (35).
7. Device according to one of claims 1 to 6, wherein the supporting element (1) comprises lateral grooves or slots (5, 6) having an extension along the longitudinal axis (2-2), wherein webs (26, 27) of the legs (17, 18) are guided transverse to the longitudinal axis (2-2).
8. Device according to claim 7, wherein at least one end stop element (33) is provided for a movement of the guide shoe (14) along the longitudinal axis (2-2) in the groove or slot (5, 6).
9. Device according to one of claims 1 to 8, wherein the supporting element (1) is extruded and/or the guide shoe (14) is manufactured by forging or casting.
10. Device according to one of claims 1 to 9, wherein the activating element (46) and a fixing element (44) for fixing the supporting element (1) at the base body (4) comprise activating surfaces for one and the same tool.
11. Device according to one of claims 1 to 10, wherein the supporting element (1) is built at least over one part of its extension along the longitudinal axis (2-2) with a double-T-cross-section.
12. Device according to one of claims 1 to 11, wherein the supporting element (1) comprises slots or elongated holes extending along the longitudinal axis (2-2).

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