EP0912297A1

EP0912297A1 - Gripping device

Info

Publication number: EP0912297A1
Application number: EP97903302A
Authority: EP
Inventors: Norbert Lindenthal; Hans Rösch
Original assignee: Bessey and Sohn GmbH and Co KG
Current assignee: Bessey and Sohn GmbH and Co KG
Priority date: 1997-02-17
Filing date: 1997-02-17
Publication date: 1999-05-06
Anticipated expiration: 2017-02-17
Also published as: JP2000506444A; DK0912297T3; ATE217561T1; US6113085A; AU1790897A; WO1998035790A1; ES2176676T3; EP0912297B1; JPH10277960A; DE59707291D1; CA2252009A1; CA2252009C

Abstract

In order to improve a clamping device comprising a guide rail, a first clamping element supported on the guide rail and having a first clamping surface formed by a pressure member of a clamping spindle and movable in a clamping direction, a slide bracket guided on and movable along the guide rail and fixable by a first wedging element, and a feed device including a second wedging element supportable on the guide rail and a pivotally mounted feed lever lying with its handle between the guide rail and the clamp grip of the clamping spindle, and a second clamping element supported on the guide rail and having a second clamping surface, such that ergonomically it can be installed more expediently on a workpiece, and the workpiece can thereby be finally clamped, it is proposed that the feed lever act with a first pressure member between the second wedging element and the slide bracket such that upon actuation of the feed lever in the direction of the clamp grip of the clamping spindle, the slide bracket is displaceable in the clamping direction relative to the second wedging element.

Description

Clamping device

The invention relates to a tensioning device comprising a guide rail, a first tensioning element supported on the guide rail with a first tensioning surface formed by a pressure piece of a tensioning spindle and movable in a tensioning direction, with a slide bracket which is guided on the guide rail and movable along it and can be fixed by a first tilting element , which carries a spindle nut penetrated by the clamping spindle, and with a feed device which has a second canting element which can be supported on the slide rail and a pivotably mounted feed lever with its handle between the guide rail and a clamping handle of the clamping spindle, with which the slide bracket is relative to the second Cantilever element is displaceable in the clamping direction, and a second clamping element supported on the guide rail with a second clamping surface.

Such a tensioning device is known for example from US 4,989,847.

However, this tensioning device is cumbersome to use. It is indeed possible to move the first clamping element relative to the second clamping element with one hand in order to first of all To apply the clamping device, the feed lever being able to be moved in the direction of the guide rail and a projection extending on a side of the guide rail opposite the feed lever being provided as a counter-bearing for the hand.

To clamp the clamping device by means of the clamping spindle, it is necessary to use the second hand to tighten the spindle by turning the clamping handle and only after the second hand engages the clamping handle is it possible to remove the hand on the feed lever from the clamping device to remove.

The invention is therefore based on the object of improving a clamping device of the generic type in such a way that it can be attached to a workpiece more ergonomically and the workpiece can be finally clamped.

This object is achieved according to the invention in a tensioning device of the type described in the introduction in that the feed lever acts with a first pressure element between the second canting element and the slide bracket such that when the feed lever is actuated in the direction of the clamping handle of the clamping spindle, the slide bracket relative to the second tilting element in the Clamping direction is displaceable. The advantage of the solution according to the invention can be seen in the fact that by moving the slide bracket when the feed lever is actuated in the direction of the clamping handle of the spindle, the possibility has been created of holding the clamping device according to the invention with one hand on the clamping handle and on the other hand on the feed lever and in this position to attach to the workpiece. In this position, the first clamping element can first be moved in the clamping direction by actuating the feed lever, the hand already resting on the clamping handle of the clamping spindle. After a first attachment of the tensioning device according to the invention, there is then the possibility of further tightening it with the hand already resting on the tensioning handle of the tensioning spindle, the hand being able to release the feed lever in a simple manner and still holding the tensioning handle of the tensioning spindle, for example between the palm of the hand and thumb and the ball of the thumb, so that with one and the same hand on the one hand the first clamping element can be moved and then, with the clamping device already attached, the full clamping force can be applied by turning the clamping spindle further without the need to use a second hand and with it the first To hold the clamping device on the clamping handle.

In principle, it would be possible to connect the first pressure element in an articulated manner to the feed lever, wherein, for example, even a translation of motion would be possible via an articulated connection. For reasons of a particularly simple solution, however, it is favorable if the first pressure element is rigidly connected to the feed lever.

With regard to the storage of the feed lever, no further details have been given in connection with the previous exemplary embodiments. For example, it would be conceivable to mount the feed lever on the slide bracket or on the first canting element.

For reasons of a particularly simple and compact construction, however, it is particularly favorable if the feed lever is mounted on the second tilting element, since the effect of the first pressure element on the slide bracket can then be realized in a particularly simple manner.

A particularly expedient and structurally simple implementation of the storage provides that the feed lever is pivotally mounted on the second tilting element about a pivot axis and that when the feed lever is actuated, the first pressure element can be moved in the direction of the slide bracket. A movement of the first pressure element pushing the sliding bracket in the tensioning direction can thus already be implemented in a simple manner.

The first pressure element could also on the one hand via an interposed part or an intermediate member on the Slide bracket act. Also for reasons of the particularly simple constructive solution, however, it is advantageous if the first pressure element acts directly on the slide bracket.

Furthermore, the action on the first slide bracket can also be implemented in a variety of ways. For reasons of simplicity, it has also proven to be relatively inexpensive if the first pressure element acts on an area of the sliding bracket which extends between the guide rail and the clamping spindle, preferably between the pivot axis of the feed lever and the clamping spindle.

With regard to the way in which the second canting element is tilted, a wide variety of implementation options are conceivable. For example, it would be conceivable to assign the second canting element a spring element holding it in a canting position, so that the feed lever could be arranged as desired on the second canting element.

A particularly expedient construction, which is distinguished in particular by its functionality, provides that the feed lever is arranged on the second canting element in such a way that when the feed lever is actuated, a compressive force acting on the second canting element opposite to the clamping direction for tilting and thereby fixing it of the second tilting element leads. This means that in this embodiment, the force acting anyway on the bearing of the feed lever opposite to the clamping force is used to tilt the second canting element, so that no additional spring element applying this force is required for this. Furthermore, this solution has the advantage that when the feed lever is not actuated, no large forces act on the second anchoring element, and thus the second anchoring element can also be easily tracked to the slide bracket without large frictional forces, such as, for example, being always tilted by a spring element Position tilting element are required.

Within the framework of the solution described so far, only features have been described which define the function of the tensioning device according to the invention when the feed lever is actuated in the direction of the tensioning handle. A particularly cheap solution, in particular one that can be used universally, provides that the feed lever acts on a second pressure element and that the slide bracket can be displaced in the tensioning direction relative to the second tilting element when the feed lever is actuated in the direction of the guide rail.

This solution has the great advantage that the tensioning device can thus be actuated universally, that is, depending on the space requirement and intended use, there is the possibility, on the one hand, that to move the first clamping element in that the feed lever is moved in the direction of the clamping handle, but there is also the possibility of moving the first clamping element in the same direction by moving the feed lever in the direction of the guide rail, so that here universal handling , depending on the desired application.

In this solution, too, it is particularly advantageous if the second pressure element is firmly connected to the feed lever.

A mechanically particularly favorable solution provides that the first and the second pressure element are integrally formed on the feed lever, so that a particularly simple and inexpensive manufacture of the tensioning device according to the invention is possible.

It has proven to be useful if the first and the second pressure element are arranged approximately symmetrically to the pivot axis of the feed lever, so that when the feed lever is moved in the direction of the clamping handle and in the direction of the guide rail approximately the same feed paths of the slide bracket can be reached.

It is preferably provided that the first and the second pressure element act on the area of the slide bracket located between the guide rail and the clamping spindle and thus, the slide bracket can always be displaced in the clamping direction in a simple manner regardless of the direction of the pivoting of the feed lever.

With regard to the arrangement of the second pressure element, it has proven to be particularly favorable if the second pressure element acts on an area of the slide bracket located between the pivot axis of the feed lever and the guide rail, since in this case a force exerted by the pressure element on the slide bracket with a moment acts that does not counteract a canting moment.

In order to ensure that the second canting element always follows the slide bracket, in particular if it is released after the feed lever is actuated, it is advantageously provided that the second canting element is acted upon by a driving spring element in the tensioning direction. This means that this driving spring element always acts on the second tilting element in such a way that it passes into its position closest to the slide bracket.

In order to give the driving spring element a suitable support, it is provided that the driving spring element engages on a part which can be moved together with the slide bracket.

Such a part that can be moved with the slide bracket can either be the slide bracket itself or there is the possibility of a component that is carried along by the slide bracket, for example Use the housing as an abutment or as a support for the driving spring element.

In the simplest case, it is provided that the driving spring element is a drag spring element that engages the sliding bracket.

In principle, this driving spring element can engage at any point on the second tilting element, as long as it always guides the second tilting element to the slide bracket. A particularly favorable solution provides, however, that the driving spring element acts on the second canting element in such a way that it is in a canting position without play, so that, for example, when the feed lever is actuated and the force thus exerted on the second canting element, the canting of the second canting element can be used without play is and thus the second tilting element does not have to overcome a game between the opening provided for the tilting and the guide rail for reaching the tilting position.

With regard to the design and arrangement of the first tilting element, no further details have been given in connection with the previous exemplary embodiments.

For example, it would be conceivable to arrange the first canting element as a separate part next to a slide bracket with a guide opening for the guide rail. There this is complex and in particular in such a case the force additionally applied by the tensioning spindle would not support the tilting of the first tilting element, it is preferably provided that the first tilting element is rigidly connected to the slide bracket.

It is particularly advantageous if the first canting element is integrally formed on the slide bracket and is thus ultimately part of the same.

In order to ensure in this case that the first canting element assumes its canting position after being advanced by the feed lever, it is preferably provided that the first canting element is acted upon by a canting spring element which also holds it in its canting position when the feed lever is actuated.

This means that regardless of how the feed lever acts on the slide bracket and thus the first tilting element, the force of the tilting spring element is always so great that the first tilting element remains in its tilted position.

The tilting spring element can be arranged in different ways. For example, it would be conceivable that the tilt spring element directly on the Supports the guide rail. However, it is particularly advantageous if the tilting spring element is supported on a housing guided on the guide rail.

In this case, a relative shift between the first canting element and the housing can be avoided by different measures.

However, since the greatest possible force causing a tilting is to be exerted with the tilting spring element according to the invention, it is preferably provided that the housing is supported with a counter bearing on the first tilting element, so that the counter bearing in conjunction with the tilting spring element prevents the tilting of the first tilting element cause.

In order to be able to apply the greatest possible force with this, it is provided that the counter bearing and a location of the action of the tilting spring element on the first tilting element are as far apart as possible, preferably arranged on opposite sides of the guide rail.

In order to also create the possibility of releasing the canting of the first canting element for free displacement of the first clamping element, it would be conceivable, for example, to provide the first canting element with an extension which can be actuated manually and when it is actuated the canting of the first canting element can be canceled.

A particularly advantageous solution provides that the housing has a bearing for a release element which acts on the first canting element and can be actuated manually, with which the canting of the first canting element can be canceled when actuated.

In an advantageous embodiment, this release element is designed as a slide, which is slidably mounted on the housing.

In order to be able to advantageously cancel the effect of the tilting spring element with this release element and, on the other hand, to maintain it in full even when the release element is not actuated, it is preferably provided that the tilting spring element acts on the release element in order to keep this and the first tilting element in the tilted position, if the release element is not actuated.

With regard to the design of the housing, no further details have been given in connection with the previous description of the individual exemplary embodiments. An advantageous exemplary embodiment provides that the housing contains the first tilting element, the second tilting element and at least partially encloses the slide bracket in order to support them on the one hand and on the other hand to be able to accommodate the elements acting on them.

Furthermore, it is preferably provided that the housing is provided with a grip part which surrounds the guide rail and extends in the region of the handle of the feed lever, on which the hand can be placed when the feed lever is actuated in the direction of the guide rail.

In order to be able to use the housing, for example as an abutment for the tilting spring element, it is provided that the housing can be moved together with the slide bracket.

The housing can be moved in a wide variety of ways. It is particularly advantageous if the housing can be moved with the slide bracket in that it rests with the counter bearing on the first canting element.

With regard to the design of the clamping spindle and the pressure piece that can be used with it, no further details have so far been given. An advantageous exemplary embodiment provides that the clamping spindle carries a rotary stop element made of deformable material at its end facing the pressure piece.

The rotary stop element serves to create a rotary stop against unscrewing the clamping spindle. Due to the fact that the rotary stop element is made of a deformable material, the stop is not an absolutely rigid stop, but there is the possibility, in spite of the stop initially being applied, that the clamping spindle is additionally deformed if the rotary stop element is accidentally clamped with the rotary stop element already attached continue to rotate in the direction of their releasing position in order to achieve a loosening of the pressure piece, which is sufficient, on the other hand, to then again loosen the canting of the first canting element and thus to be able to move the entire first clamping element.

It is preferably provided here that the rotary stop element in its effective position in the undeformed state prevents adjustment of the clamping spindle to a fully open position and the fully open position of the clamping spindle, which no longer permits rotation, can only be reached by deformation of the rotary stop element.

A particularly favorable solution also provides that the rotary stop element serves at the same time as an alignment element for the pressure piece articulated with the tensioning spindle and thus at least restricts an articulated movement of the pressure piece relative to the tensioning spindle, but on the other hand, due to its elasticity under the action of force, permits further pivoting of the pressure piece . Further features and advantages of the invention are the subject of the following description and the drawing of an exemplary embodiment in the drawing:

Fig. 1 is a side view of an inventive

Clamping device with cut-open housing and partially broken second canting element;

FIG. 2 shows a section along line 2-2 in FIG. 4;

3 shows a section similar to FIG. 1 with the housing cut and the second canting element cut without a feed lever;

Fig. 4 shows a section similar to Fig. 3 with the inserted

Feed lever;

FIG. 5 shows an enlarged section of a region A in FIG. 1;

Fig. 6 is a section similar to Fig. 1 with the feed lever actuated in the direction of the guide rail and

Fig. 7 is a section similar to Fig. 1 with the feed lever actuated in the direction of the clamping handle. An embodiment of a tensioning device according to the invention, shown in FIG. 1, comprises a guide rail designated as a whole by 10, in particular designed as a guide rail of a clamping clamp, which extends in a longitudinal direction 12. On this guide rail 10, a first clamping element, designated as a whole by 14, is displaceably guided in the direction of the longitudinal direction 12.

The first clamping element 14 comprises a slide bracket 16 which extends approximately transversely to the longitudinal direction 12 of the guide rail 10 and on which a first canting element 18 is integrally formed.

The first canting element 18 has an opening 20, through which the guide rail 10 is guided, and canting supports 22 and 24 arranged diagonally opposite one another in the opening 20, between which the canting diagonal 26 extends.

The canting diagonal 26 is such that when an end 28 of the sliding bracket 16 opposite the first canting element 18 is acted upon by a force 30 which acts counter to a tensioning direction 32, the first canting element 18 is fixed by frictionally fixing the canting supports 22 and 24 on the guide rail 10 takes place. Force 30 no longer applies to the end 28, the first canting element 18 can be moved along the guide rail 10 and can be positioned as desired on the latter.

For clamping a workpiece 34, a clamping spindle, designated as a whole by 36, is provided, which passes through an area of the end 28 designed as a spindle nut 38 and can be displaced relative to the end 28 by rotation about its spindle axis 40, the spindle axis 40 preferably moving approximately parallel to the longitudinal direction 12 of the guide rail 10 extends.

To turn the clamping spindle 36, this is provided with a clamping handle 42, which also extends approximately parallel to the longitudinal direction 12 of the guide rail 10 on a side of the clamping spindle 36 facing away from the spindle nut 38 and preferably has a gripping surface 44 which is approximately cylindrical to the spindle axis 40.

The tensioning spindle 36 also carries at its end 46 opposite the tensioning handle 42 a pressure piece designated as a whole by 48, which is preferably connected to the end 46 of the tensioning spindle 36 via an articulated joint, preferably a ball joint 50.

The pressure piece 48 in turn has on its side facing away from the ball joint 50 a clamping surface 52 with which this acts on the workpiece 34 to be clamped. In order to keep the pressure piece 48, which tilts due to the action of gravity due to the action of gravity, in order to attach the tensioning device according to the invention such that the pressure surface 42 extends approximately perpendicular to the spindle axis 40, there is between the pressure piece 48 and the end 46 of the tensioning spindle 36, preferably in one the area between these formed ball joint 50, an alignment element 54 is provided, which is preferably designed as a sleeve made of elastic material, which is supported on its side facing the spindle nut 38, preferably in the form of a ring contact surface at the end 46 of the clamping spindle 36 and on the Thrust piece 48 facing side preferably engages around a conical section 58 with a cylindrical projection 60 and is fixed on it, opposite to the pressure surface 52 and extending in the direction of the end 46 of the clamping spindle 36.

The alignment member 54 also serves as a rotation stop element and for this purpose has an end-face, the spindle nut 38 facing annular surface 62 which, when turning back the tensioning spindle 36 opposite to the clamping direction 32 on one of these facing end 64 of the spindle nut 38 comes into contact, and thus a further ^• turning back the Clamping spindle 36 only possible in that the rotary stop element 54 as a whole deforms in its extension between the annular surface 62 and the cylindrical projection 60 while shortening the distance between them. As a result, when the tensioning spindle 36 is turned back, the operator will end it when the annular surface 62 comes to rest on the end face 64. Should a workpiece 34 have been clamped by means of the pressure piece 48 when the annular surface 32 abuts the end face 64 and the first canting element 18 be tilted due to the clamping force 30 acting on the slide bracket 12, so that it can only be released with difficulty, in the clamping force 30 can be released in a simple manner in that the clamping spindle 36 is deformed while the rotary stop element 54 is deformed, in particular by shortening its extension between the annular surface 62 and the cylindrical extension 60. Even a slight movement is sufficient to release the clamping of the workpiece 36 and thus to reduce the force 30 or even to omit it, so that a displacement of the first tilting element 18 together with the sliding bracket 16 is then possible again.

To move the slide bracket 16 in the clamping direction 32, a second canting element 70 is provided on a side of the slide bracket 16 opposite the pressure piece 48, which, as shown in FIGS. 2 and 3, comprises two parallel side parts 72 and 74, which by a are integrally connected to this integrally formed cross member 76. In addition, a canting bolt 78, which also extends between the side parts 72 and 74, is also provided at a distance from the transverse part 76. The side parts 72 and 74 form, together with the transverse part 76 connecting them and the canting bolt 78 arranged at a distance from the transverse part 76, an aperture 80 through which the guide rail 10 extends, the aperture 80 likewise having two canting supports 82 and 84 which are diagonally opposite one another arranged in the opening 80 and connected to one another by a canting diagonal, the canting diagonal 86 being inclined in the same direction as the canting diagonal 26 with respect to the longitudinal direction 12 of the guide rail 10.

The canting bolt 78 is preferably arranged as a bolt with a rectangular cross-sectional shape, a flat side 88 facing the guide rail 10 and forming the canting support 84 with a partial area.

The second canting element 70 extends transversely to the longitudinal direction 12 beyond the canting bolt 78 in the direction of the clamping spindle 36 and approximately parallel to the slide bracket 16 and carries in the region of its end 90 facing the clamping spindle 36 a pivot bearing 92 for a feed lever designated as a whole with 100, whereby in the simplest case, the pivot bearing 92 is formed by a bearing pin 104 passing through the feed lever 100 in the region of a bearing eye 102 and likewise passing through corresponding receptacles 106 in the region of the ends 90 of the side parts 72 and 74. The feed lever 100 extends from the bearing eye 102 with a handle 106 between the guide rail 10 and the clamping handle 42, the handle 106 having a first section 108 facing the bearing eye 102, which forms an acute angle with the guide rail 10 and extends away therefrom , which is adjoined by a second section 110, which is located approximately centrally between the clamping handle 42 and the guide rail 10, the feed lever 100 having a curved grip 112 in the region of a transition from the first section 108 to the second section 110 on a side facing away from the guide rail 10 forms and the second section 110 on its side opposite the clamping handle 42 has a grip surface 114 which runs approximately parallel to the clamping handle 42 or preferably in the direction of an end 116 of the feed lever 100 with increasing distance from the clamping handle 42.

To move the slide bracket 16 in the clamping direction, the feed lever 100, as shown in FIG. 4, has a first pressure element 120, which lies between the pivot bearing 92 and the clamping spindle 36, and a second pressure element 122, which lies between the pivot bearing 92 and the guide rail 10 lies.

Both pressure elements 120 and 122 are preferably formed in one piece on the feed lever 100 and form an approximately triangular one with it in the region of the pivot bearing 92 Lever body 124, which faces the sliding bracket 16 with a triangular side 126, the triangular side 126 running parallel to a rear side 128 of the sliding bracket 16 facing it.

The pressure pieces 120 and 122 for their part still have rounded pressure surfaces 130 and 132 which rise slightly above the triangle side 126 and act on the rear side 128 of the sliding bracket 16.

When the feed lever 100 is not actuated, the pressure surfaces 130 and 132 on the rear side 128 of the slide bracket 16 are held in contact. This is brought about by a driving spring element 134, which surrounds a front side 136 of the slide bracket 16 and engages on the side parts 72 and 74 of the second canting element 70, preferably in a region between the pivot bearing 92 and the canting pin 78. In the simplest case the driving spring element 134 is provided with a helical spring body 138 which surrounds the slide bracket 16 in a U-shape and rests on the front 136 thereof and to which pull hooks 140 are formed, which are provided in hook receptacles 142 on the side parts 72 and 74, preferably recesses on one of the slide bracket 16 opposite side of the same, intervene.

By means of the driving spring element 134, the second tilting element 70 is thus when the feed lever 100 is not actuated Always pulled so far in the direction of the slide bracket 16 that the pressure surfaces 130 and 132 rest against the back 128 of the slide bracket 16 without play.

In order to ensure that the slide bracket 16 always remains in a tilted position and thus automatically tilted in any position along the guide rail 10, a guide housing 150 is provided which is guided in a sliding manner on the guide rail 10. For this purpose, guide surfaces 152 and 154 arranged on the housing on opposite sides of the guide rail 10 are provided, which lie on a guide diagonal 156 which is inclined relative to the guide rail opposite to the canting diagonal 26.

Furthermore, the housing 150 forms a counter bearing 158, which is located between the guide rail 10 and the clamping spindle 36 and against which the slide bracket 136 can be placed with its front side 136.

The counter bearing 158 preferably lies in a region of the slide bracket between the pivot bearing 92 and the end 28 of the same, preferably as close as possible to an area of the slide bracket on which the pressure surface 130 of the first pressure element 120 acts.

A canting spring element 160 interacts with the counter bearing 158, which is located on a side of the guide rail 10 opposite the counter bearing 158 and also is arranged directly opposite the counter bearing 158 with respect to the slide bracket 16 and is supported on a contact surface 162 opposite to the clamping direction. The canting spring element 160 acts on a slide 164 which bears on the first canting element 18 on a rear side 166 and on a front side 168 with projections 170 and 172 and thus comprises the first canting element 18 on both sides on its side facing away from the slide bracket 16.

Through the tilting spring element 160, the slide 164 is acted upon in the direction of the tensioning direction 32 and thus acts with the projection 170 against the rear side 166 of the tilting element 18, so that the tilting element is in total due to the fact that the sliding bracket 16 rests with its front side 136 on the counter bearing 158 18 is always applied in the direction of its canting position. The force of the tilting spring element 160 is preferably selected so that regardless of which of the pressure elements 120 or 122 acts against the sliding bracket 16, even when the sliding bracket 16 is pushed forward in the tensioning direction 32, the tilting spring element 160 is able to tilt the first tilting element 18 in its way Hold position.

The slide 164 is in turn guided as a whole, namely in the direction of the clamping direction 32 and opposite thereto, with guide surfaces 174 in a corresponding guide receptacle 176 of the housing 150 and has one on one Cantilever spring element 160 facing away from the side of the first tilting element 18 is a manually operable pressure surface 178, the manual actuation of which can counteract the force effect of the tilting spring element 160 and by the action of the projection 172 against the front side 168 of the tilting element 18, the tilting of the same can be canceled, for example by that to move the entire first clamping element 14 opposite to the clamping direction 32.

1 and 4, the housing 150 is preferably designed such that it completely surrounds the lever body 124, the second canting element 70 and the first canting element 18 with a part of the slide bracket 16, as shown in FIG. 2. The housing 150 also extends with a grip part 180 surrounding the guide rail 10 in the same direction as the handle 106 of the feed lever 100 and the clamping handle 42, the grip part 180 preferably completely enclosing the guide rail 10 and at its end facing away from the slide bracket 16 a guide 182 is guided again on the guide rail 10. Furthermore, the grip part 180 preferably has on its side opposite the handle 106 of the feed lever 100 a support surface 184 for a hand, which then serves as a support for an interior of the palm when the handle 106 of the feed lever 100 is actuated in the direction of the guide rail 10 should. In particular, the grip part 180 is integrally formed on the housing 150.

The tensioning device according to the invention preferably also has a second tensioning element 190, which can be designed, for example, in the same way as the first tensioning element 14 and can be displaceable on the guide rail 10.

In the simplest case, the clamping element 190 comprises a bracket 192 which is angled at right angles to the guide rail 10 and which has a molded-on clamping surface 194 at its front end, which is arranged facing the clamping surface 52 of the pressure piece 48.

Instead of a bracket 192 integrally formed on the guide rail 10, it is also conceivable to provide a fixed bracket which is firmly connected to the rail and has a clamping surface which is also integrally formed thereon.

As shown in FIGS. 6 and 7, in the clamping device according to the invention for attaching the same and for carrying out a first clamping of the workpiece 34, the sliding bracket 16 can be moved with one hand in the clamping direction 32.

For this purpose, it is possible, as shown in FIG. 6, for the handle to lie 180 in the palm of the hand, the handle part 180 with its support surface 184 against the palm works. The fingers can grip the handle 106 of the feed lever and act in particular on this in the area of the handle curvature 112 and the areas of the first section 108 and the second section 110 adjoining on both sides.

Because the hand engages both on the handle 106 of the feed lever 100 and on the handle part 180, there is the possibility of precisely aligning the tensioning device according to the invention with one hand and by moving the handle 106 in the direction of the handle part 180 the slide bracket 16 and thus also to move the pressure piece 48 in the clamping direction 32 in the direction of the second clamping element 190.

Here, as also shown in FIG. 6, the second pressure element 122 acts on the rear side 128 of the slide bracket 16, starting from the non-actuated position of the feed lever 100 the first time it is actuated in the direction of the handle part 180, the second canting element 70 immediately opposite the guide rail 10 tilted and thus stuck on the guide rail 10, so that a further actuation of the feed lever 100 leads to the fact that the second pressure element 122 with its pressure surface 132 moves the slide bracket 16 in the tensioning direction 32, which is possible despite the maintenance of the tilting thereof by means of the tilting spring element 160 is because the cant only against a movement opposite to the tensioning direction 32, but not against a movement in the tensioning direction 32.

If the feed lever 100 is then released and returns to its initial position, the tilting of the first canting element 18 by means of the canting spring element means that the sliding bracket 16 can no longer move in the opposite direction to the tensioning direction 32, but in turn is fixed on the guide rail 10 while the drag spring element 138 pulls the second canting element 70 again in the direction of the slide bracket while lifting its tilt and causes this to always follow the slide bracket 16 in the tensioning direction 32 when the feed lever 100 is no longer actuated. Because the drag spring element 138 engages the second canting element 70 in a region between the pivot bearing 92 and the guide rail 10, the drag spring element 138 also causes the second canting element 70 to pivot in the non-actuated position of the feed lever 100 so that it immediately when the feed lever 100 is actuated, it becomes canted on the guide rail 10 again.

If, as shown in FIG. 7, the feed lever 100 is moved in the direction of the clamping handle 42, the clamping handle 42 also being in the palm of the hand and the fingers gripping the feed lever 100 preferably in the region of its second section 110, the first pressure element 120 acts with its pressure surface 130 against the rear side 128 of the slide bracket 16 and also moves it in the clamping direction, whereby - as already described - in the same way as when the feed lever 100 moves in the direction of the handle part 180, the second canting element 70 is immediately tilted on the guide rail 10 and thereby pushing the slide bracket 16 in the clamping direction 32 takes place, the second canting element 70 following the slide bracket 16 after releasing the feed lever 100 in the same manner as already described.

After the workpiece to be clamped is slightly clamped between the pressure piece 48 and the pressure surface 194 of the second clamping element by moving the feed lever 100, a firm clamping of the workpiece 34 by turning the clamping handle 42 and thus rotating the clamping spindle 36 is possible, so that with the invention Clamping device the same clamping forces can be generated as with conventional clamping clamps, wherein it is preferably possible to use them appropriately.

To release the workpiece 34, the clamping spindle 36 is turned back by turning the clamping handle 42 and then a simple displacement of the entire slide bracket 16 is possible by, for example, pressing the pressure surface 178 of the slide 164 with the thumb and thus the canting spring element 160 no longer the first Tilting element 18 holds in its tilted position, so that then entire first clamping element 14 is slightly displaceable opposite to the clamping direction 32.

If, when clamping the workpiece 34, the clamping spindle 36 is turned back so far that the annular surface 62 of the alignment element 54 is already in contact with the end face 64 of the end 28 of the slide bracket 16, there is still the possibility of loosening due to the elasticity of the rotary stop element 54 strong rotation of the clamping handle 42 slightly turn back the clamping spindle 36, a slight rotation being sufficient to release the clamping force to such an extent that the canting of the first canting element 18 can be released by actuating the pressure surface 178 of the slide 164.

Because of its deformability, the rotary stop element 54 thus offers the possibility of being able to easily release the clamping device according to the invention in this position even when the spindle is incorrectly rotated back and clamping a workpiece, since the elastic deformability of the rotary stop element 54 creates additional scope for turning the spindle 36 back .

Claims

EXPECTATIONS

Tensioning device comprising a guide rail, a first tensioning element supported on the guide rail with a first tensioning surface formed by a pressure piece of a tensioning spindle and movable in a tensioning direction, with a slide bracket which is guided along the guide rail and movable along it and can be fixed by a first tilting element, one of which the clamping spindle passes through the spindle nut, and with a feed device which has a second canting element that can be supported on the slide rail and a pivotally mounted feed lever with its handle between the guide rail and the clamping handle of the clamping spindle, with which the slide bracket is relative to the second canting element in the clamping direction is displaceable, and a second clamping element supported on the guide rail with a second clamping surface, characterized in that the feed lever (100) is equipped with a first pressure element (1 20) acts between the second canting element (70) and the slide bracket (16) such that when the feed lever (100) is actuated in the direction of the clamping handle (42) of the clamping spindle (36), the slide bracket (16) relative to the second tilting element (70) is displaceable in the clamping direction (32).

2. Clamping device according to claim 1, characterized in that the first pressure element (120) is rigidly connected to the feed lever (100).

3. Clamping device according to claim 1 or 2, characterized in that the feed lever (100) on the second tilting element (70) is mounted.

4. Clamping device according to claim 3, characterized in that the feed lever (100) on the second tilting element (70) is pivotally mounted about a pivot axis and that when the feed lever (100) is actuated, the first pressure element (120) in the direction of the slide bracket (16 ) is movable.

5. Clamping device according to one of the preceding claims, characterized in that the first pressure element (120) acts directly on the slide bracket (16).

6. Clamping device according to claim 5, characterized in that the first pressure element (120) acts on an area of the 'slide bracket (16) extending between the guide rail (10) and the clamping spindle (36).

7. Clamping device according to one of the preceding claims, characterized in that the feed lever (100) in this way on the second tilting element (70) It is arranged that when the feed lever (100) is actuated, a compressive force (30) acting on the second canting element (70) in the opposite direction by means of the tensioning direction (32) leads to canting and consequent fixing of the second canting element (70).

8. Clamping device according to one of the preceding claims, characterized in that the feed lever (100) acts on a second pressure element (122) and that with this when the feed lever (100) is actuated in the direction of the guide rail (10) of the slide bracket (16) relatively to the second canting element (70) in the clamping direction (32) is displaceable.

9. Clamping device according to claim 8, characterized in that the second pressure element (122) is fixedly connected to the feed lever (100).

10. Clamping device according to claim 8 or 9, characterized in that the first and the second pressure element (120, 122) are integrally formed on the feed lever (100).

11. Clamping device according to one of claims 8 to 10, characterized in that the first and the second pressure element (120, 122) are arranged approximately symmetrically to the pivot axis of the feed lever (100).

12. Clamping device according to one of claims 8 to 11, characterized in that the first and the second pressure element (120, 122) act on the region of the slide bracket (16) lying between the guide rail (10) and the clamping spindle (36).

13. Clamping device according to one of claims 8 to 12, characterized in that the second pressure element (122) acts on a region of the sliding bracket (16) lying between the pivot axis of the feed lever (100) and the guide rail (10).

14. Clamping device according to one of the preceding claims, characterized in that the second canting element (70) is acted upon by a driving spring element (138) in the clamping direction (32).

15. Clamping device according to claim 14, characterized in that the driving spring element (138) engages on a part moved with the slide bracket (16).

16. Clamping device according to claim 15, characterized in that the driving spring element (138) on the slide bracket (16) engaging drag spring element (138).

17. Clamping device according to one of claims 14 to 16, characterized in that the driving spring element (138) acts on the second canting element (70) in such a way that it is free of play in a position canted with the guide rail (10).

18. Clamping device according to one of the preceding claims, characterized in that the first tilting element (18) is rigidly connected to the slide bracket (16).

19. Clamping device according to claim 18, characterized in that the first tilting element (18) is integrally formed on the slide bracket (16).

20. Clamping device according to one of the preceding claims, characterized in that the first canting element (18) is acted upon by a canting spring element (160) which also holds this in its canting position when the feed lever (100) is actuated.

21. Clamping device according to claim 20, characterized in that the tilting spring element (160) is supported on a housing (150) guided on the guide rail (10).

22. Clamping device according to claim 21, characterized in that the housing (150) is supported with a counter bearing (158) on the first tilting element (16, 18).

23. Clamping device according to claim 21 or 22, characterized in that the counter bearing (158) and a place of action of the tilting spring element (160) on the first tilting element (16, 18) have the greatest possible distance from one another.

24. Clamping device according to one of claims 20 to 23, characterized in that the housing has a bearing for a on the first canting element (16, 18) acting and manually operable release element (164) with which the canting of the first canting element (upon actuation) 16, 18) can be canceled.

25. Clamping device according to claim 24, characterized in that the tilting spring element (160) acts on the release element (164) in order to hold this and the first tilting element (18) in the tilted position.

26. Clamping device according to one of the preceding claims, characterized in that the housing (150) at least partially encloses the first canting element (18), the second canting element (70) and the slide bracket (16).

27. Clamping device according to claim 26, characterized in that the housing (150) with a surrounding the guide rail (10) in the region of the handle (106) of the Feed lever (100) extending handle part (180) is provided.

28. Clamping device according to claim 26 or 27, characterized in that the housing (150) with the slide bracket (16) can also be moved.

29. Clamping device according to one of the preceding claims, characterized in that the clamping spindle (36) at its end facing the pressure piece (48) (46) carries a rotary stop element (60) made of deformable material.

30. Clamping device according to claim 29, characterized in that the rotary stop element (60) in its effective position in the undeformed state prevents adjustment of the clamping spindle (36) to a fully open position and the fully open position of the clamping spindle (36) by deformation of the Rotary stop element (60) is accessible.

31. Clamping device according to claim 29 or 30, characterized in that the rotary stop element (60) serves as an alignment element for the pressure piece (48) articulatedly connected to the clamping spindle (36).