EP3360646B1 - Tightening tool and tightening tool bearing part - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION

• unmittelbar gegen eine Spannfläche, insbesondere eines Spanntisches oder einer Spannplatte, gespannt werden kann, um das Werkstück zu fixieren, oder
• mittelbar, insbesondere über eine von dem Spannwerkzeug gespannte Spannkette, zum Fixieren gegen die Spannfläche gespannt werden kann.

The invention relates to a clamping tool, by means of which a workpiece bspw.

• can be clamped directly against a clamping surface, in particular a clamping table or a clamping plate, to fix the workpiece, or
• indirectly, in particular over a stretched by the clamping tool tensioning chain, can be clamped for fixing against the clamping surface.

Such clamping tools must be robust and durable, with relatively small (especially applied manually via actuating tools) operating forces generate large clamping forces and are characterized by a simple, yet reliable operation, which also for connecting the clamping tool with a clamping table, bringing about the operative connection between the clamping tool and the workpiece or a tensioning chain and the operation for tensioning the clamping tool must apply. It is possible that with such clamping tools clamping forces can be generated, which can be up to 20 kN, 40 kN, 60 kN or even 90 kN.

Furthermore, the invention relates to a bearing body part for such a clamping tool.

STATE OF THE ART

CH 597 976 A5 discloses a tightening tool having a foot that engages in a cross-section a sliding block, which is bolted to a clamping table and having a coupling cross-section in the form of an inverted T surrounds. An upwardly extending central web of the foot has an oriented in the direction of a pivot axis through hole into which a bearing pin is inserted. The bearing pin is on a grub screw on the Central bridge fixed. The bearing pin forms on both sides of the central web projecting journals. A clamping lever has two parallel side cheeks forming bearing eyes, in which the bearing pins are pivotally mounted. About a hinged in an end region of the clamping lever clamping screw of the clamping lever can be pivoted relative to the foot and the central web, which between the other end of the clamping lever and the clamping table, a workpiece can be clamped.

On off EP 0 391 346 B1 known clamping tool has a clamping rail. The tensioning rail here has at least one bore, via which the tensioning rail can be screwed to a tensioning table or a tensioning plate with a T-slot nut and thus fixed to the tensioning table or the tensioning plate. The tensioning rail has an upwardly open longitudinal recess, which corresponds approximately to an inverted T in cross section. In the longitudinal recess a clamping lever can be inserted from the front side. The tensioning lever extends out of the tensioning rail along the vertical leg of the T of the longitudinal recess. The clamping lever integrally forms on both sides of lateral bearing pin, which are guided in the transverse limbs of the T of the longitudinal recess. The guide is made such that on the one hand a displacement of the clamping lever in the longitudinal direction of the clamping rail is possible and on the other hand, a pivoting of the clamping lever to a predetermined by the bearing pin pivot axis relative to the clamping rail is possible. The clamping lever forms a rear clamping lever part, in which a clamping screw is screwed in one end. A front clamping lever part of the clamping lever forms a clamping jaw for the workpiece or serves as a linkage of a tensioning chain. By screwing the clamping screw in the clamping lever comes one end of the clamping screw to rest against a clamping surface in the region of the bottom of the longitudinal recess of the clamping rail. The further screwing the clamping screw leads to a pivoting of the clamping lever and thus a distortion of the workpiece in the region of the clamping jaw.

In EP 0 714 734 B1 It is proposed to separate the guarantee of the longitudinal displacement of the clamping lever relative to the clamping rail of the guarantee of the pivoting of the clamping lever. For this purpose, it is proposed that the clamping lever is not supported directly pivotable on the clamping rail, but rather the pivotable mounting of the clamping lever takes place on a bearing body, which is designed here as a bearing shoe. The bearing shoe is guided in the T-shaped recess of the clamping rail in the longitudinal direction. In addition to the pivotal mounting of the clamping lever, the bearing shoe also serves as a support the clamping screw in the area of a clamping surface of the bearing shoe for the generation of the clamping force. For an embodiment according to EP 0 714 734 B1 , which forms the closest prior art, the bearing shoe has a horizontal plate which is guided displaceably in the clamping rail. From the horizontal plate, a center bar extends vertically upwards. From the central web, in turn, two bearing pins extend integrally laterally outwards. The clamping lever has on its underside a complex shaped recess, which is closed down in the rear half by two parallel, arcuate bearing arms of the clamping lever. The bearing arms are freely cantilevered with free end portions. Upper sides of the bearing arms form bearing shells for the bearing journals of the tensioning shoe. The bearing shoe can be inserted with the central web and the bearing pin in front of the bearing arms in the recess of the clamping lever and then guided in the recess to the rear, so that the bearing pins come with their undersides to rest on the bearings.

Further prior art for clamping tools is in particular from the documents EP 1 955 816 A2 . EP 2 001 638 B1 . US 4,470,586 A . CH 463 244 A5 . DE 28 08 667 C2 . CH 450 871 A5 . DE 30 03 626 A1 . DE 89 04 096 U . FR 2 463 408 A2 . FR 2 767 730 B1 . US 1,490,063 A . US 2,872,854 A and US 4,432,538 A known and in the non-prepublished European patent application EP 16 173 983.4 described.

DE 1 253 556 B discloses a tightening tool that does not vertically skew a workpiece on a chuck table, but rather axially clamps a workpiece between a abutment and a cocking lever. The clamping lever here has a bore in which a bearing pin is held by a press fit. The unit formed with the clamping lever and the bearing pin is then inserted into a T-slot of a clamping table. With a pivoting of the clamping lever for axial clamping of the workpiece, the lateral surface of the protruding from the clamping lever end portions of the bearing pin rolls on a support surface of the clamping table.

OBJECT OF THE INVENTION

The invention has for its object to provide a clamping tool and a bearing body part for a clamping tool, which is particularly improved in terms of manufacturing, assembly, production costs, the use of materials, the force ratios and / or the maximum clamping force.

SOLUTION

The object of the invention is achieved with the features of the independent claims. Further preferred embodiments according to the invention can be found in the dependent claims.

DESCRIPTION OF THE INVENTION

According to the invention, a clamping tool is proposed which has a clamping rail (loose, for example screwable to a clamping plate or a clamping table), a clamping lever and a bearing body on which the clamping lever is pivotally mounted about a pivot axis and which is displaceably guided in the clamping rail has , Preferably, only the clamping rail, the clamping lever, the bearing body and a clamping screw (with the associated connecting or bearing elements between them) are responsible for the generation of the clamping force in the clamping tool.

The bearing body of the clamping tool according to the invention has at least one convex clamping lever bearing surface and two (for example flat) clamping rail bearing surfaces. Here, the at least one convex clamping lever bearing surface (viewed in the direction of the pivot axis of the clamping lever) between the two clamping rail bearing surfaces is arranged. In this case, the clamping lever has at least one concave bearing surface. Thus, the bearing of the clamping lever does not take place via two integral, laterally extending bearing journal with convex bearing surfaces, which are mounted in concave clamping lever bearing surfaces, for example, a trained as a clamping shoe bearing body. Rather, the clamping lever via the at least one concave bearing surface is rotatably supported about the pivot axis on the convex clamping lever bearing surface of the bearing body. In this way, the pivotability of the clamping lever can be ensured. In addition, the bearing body is over the slide rail bearing surfaces of the bearing body displaceably guided in the clamping rail, wherein in addition to the clamping rail bearing surfaces, the support of the bearing body on the clamping rail (upwards, possibly also with a lateral guide) can be done.

While for the above explained, from EP 0 714 734 B1 known embodiment inserting the bearing shoe with the central web and the bearing pin must be made from below into a complex shaped recess with a subsequent movement of the central web with the bearing journal behind the bearing arms of the clamping lever, the invention proposes that the bearing body in the direction of the pivot axis in the clamping lever is inserted. According to the invention, the assembly of the bearing body with the clamping lever is thus modified or simplified. The design according to the invention also makes it possible to extend the freedom of design for a recess of the clamping lever for inserting the bearing body, with which in particular a complex-shaped recess correspondingly EP 0 714 734 B1 is dispensable and thus can simplify a production of the clamping lever.

According to the invention, the tensioning lever has at least one recess which is peripherally closed transversely to the pivot axis in a cross section. The recess forms the or a concave bearing surface, via which the clamping lever is supported rotatably about the pivot axis on the convex clamping lever bearing surface of the bearing body. If the bearing body in the direction of the pivot axis in the clamping lever, namely the edge-closed recess of the clamping lever, used, this can also be removed only in the direction of the pivot axis again from the recess of the clamping lever. This can be advantageous for the assembly of the clamping tool according to the invention, for which first the bearing body is inserted into the recess of the clamping lever and then the clamping lever is used with herein arranged bearing body in the clamping rail, in which case the bearing body exclusively or in addition to further safety devices against an outlet from the recess of the clamping lever in the direction of the pivot axis can be prevented by walls of the clamping rail. On the other hand, by using an edge-closed recess of the clamping lever cantilevered bearing arms, like these EP 0 714 734 B1 are known to be avoided. According to the invention, the bearing shells or any bearing arms that form these can be connected in both end regions to the base body of the tensioning lever, which increases the rigidity and strength of the support.

For the design of the one hand, the convex clamping lever bearing surface of the bearing body and on the other hand, the concave bearing surface of the clamping lever, there are many possibilities. It is entirely possible that the convex clamping lever bearing surface and the concave bearing surface are formed with corresponding cylindrical cross sections, which allow pivoting of the bearing body relative to the clamping lever, even under high loads. But it is also possible that the convex clamping lever bearing surface of the clamping lever and the concave bearing surface of the clamping lever are formed cylindrically with different diameters, wherein the diameter of the convex clamping lever bearing surface is smaller than that of the concave bearing surface. Furthermore, the invention also proposes embodiments in which the convex tensioning lever bearing surface of the bearing body and / or the concave bearing surface of the tensioning lever are / are only partially cylindrical, in which case the above applies with regard to the possible diameters.

• In einem ersten teilzylindrischen Teilquerschnitt entspricht der Radius der Ausnehmung des Spannhebels dem Radius eines zylindrischen oder teilzylindrischen Scheibenkörpers des Lagerkörpers, worunter eine Spiel- oder Übergangspassung verstanden wird, welche eine Verschwenkung des zumindest teilzylindrischen Scheibenkörpers in der konkaven Lagerfläche des Spannhebels ermöglicht bei großflächiger Kontaktfläche zwischen dem Scheibenkörper des Lagerkörpers und der Lagerfläche des Spannhebels. Dieser teilzylindrische erste Teilquerschnitt ist auf der Unterseite der Ausnehmung des Spannhebels angeordnet.
• In einem zweiten Teilquerschnitt bildet die Ausnehmung des Spannhebels einen Zwischenraum mit dem Lagerkörper aus, wenn der Lagerkörper mit dem Scheibenkörper an der von dem ersten Teilquerschnitt ausgebildeten konkaven Lagerfläche des Spannhebels anliegt. Der Zwischenraum kann hierbei beliebig geformt sein. Möglich ist beispielsweise, dass der zweite Teilquerschnitt ebenfalls teilzylindrisch ausgebildet ist, wobei dieser dann aber einen größeren Durchmesser aufweist als der teilzylindrische erste Teilquerschnitt und dann ein entsprechender Übergangsbereich zwischen den beiden Teilquerschnitten vorhanden ist. Dieser Ausgestaltung liegt insbesondere die Erkenntnis zugrunde, dass sich infolge der hohen auf den Spannhebel wirkenden Kräfte im Betrieb des Spannwerkzeugs die Querschnittskontur der Ausnehmung des Spannhebels verändern kann. Verfügt die Ausnehmung über einen zylindrischen Querschnitt, kann die Verformung dazu führen, dass die Ausnehmung in einen nicht zylindrischen Querschnitt verformt wird, womit sich die Reibung zwischen dem Scheibenkörper des Lagerkörpers und der Ausnehmung des Spannhebels erhöhen würde und es schlimmstenfalls zu einem Verklemmen des Scheibenkörpers in der Ausnehmung des Spannhebels kommen kann. Dies wird erfindungsgemäß durch den Zwischenraum in dem zweiten Teilquerschnitt gewährleistet, so dass der Zwischenraum eine Art "Verformungsreserve" bereitstellt, die ein Verklemmen des Scheibenkörpers des Lagerkörpers in der Ausnehmung des Spannhebels verringert oder vermeidet.

According to the invention, the recess of the clamping lever in the cross-section transverse to the pivot axis not a cylindrical or circular partial cross-section, but rather an arbitrarily shaped, for example, egg-shaped cross-section. For this embodiment according to the invention, the recess of the clamping lever has two different partial cross sections:

• In a first part-cylindrical partial cross-section, the radius of the recess of the clamping lever corresponds to the radius of a cylindrical or partially cylindrical disk body of the bearing body, which is understood a play or transition fit, which allows pivoting of the at least partially cylindrical disk body in the concave bearing surface of the clamping lever with a large contact area between the Disk body of the bearing body and the bearing surface of the clamping lever. This part-cylindrical first partial cross-section is arranged on the underside of the recess of the clamping lever.
• In a second partial cross-section, the recess of the clamping lever forms a gap with the bearing body, when the bearing body rests with the disk body on the formed of the first partial cross-section concave bearing surface of the clamping lever. The gap can be arbitrarily shaped here. It is possible, for example, that the second partial cross section is also formed partially cylindrical, but this then has a larger diameter than the partially cylindrical first partial cross section and then a corresponding transition region between the two partial cross sections is present. This refinement is based in particular on the knowledge that, as a result of the high forces acting on the tensioning lever, the cross-sectional contour of the recess of the tensioning lever can change during operation of the tensioning tool. The recess has a cylindrical cross-section, the deformation may cause the recess is deformed into a non-cylindrical cross-section, which would increase the friction between the disk body of the bearing body and the recess of the clamping lever and in the worst case to a jamming of the disk body in the recess of the clamping lever can come. This is inventively ensured by the gap in the second partial cross section, so that the gap provides a kind of "deformation reserve", which reduces or avoids jamming of the disk body of the bearing body in the recess of the clamping lever.

There are many possibilities for the extension of the first partial cross section in the circumferential direction of the disk body. Preferably, the extent in the circumferential direction is less than 180 °. Investigations by the applicant have shown that, in particular for a circumferential angle α of the first partial cross section in the range of 120 ° to 150 °, ensuring the required pivoting angle of the clamping lever, a large contact surface between the disk body of the bearing body and the clamping lever and a reliable avoiding pinching of the disk body can be guaranteed.

Depending on the design of the bearing body, it is possible that the at least one convex clamping lever bearing surface, in particular via a central web of the bearing body or a corresponding connection region, is led out of the clamping rail, whereby then the pivot axis of the clamping lever is disposed above the clamping rail. For a particularly compact design of the clamping lever is proposed that the at least one convex clamping lever bearing surface and the two clamping rail bearing surfaces are arranged in the interior of the clamping rail.

There are many possibilities for the connection between the bearing body and the tensioning lever. Thus, for example, the bearing body can be used loosely in the clamping lever and secured only with the assembly of the clamping lever with the bearing body disposed therein with the clamping rail against leakage from the clamping lever. An assembly of the Tensioning lever with the bearing body arranged therein can be simplified if the bearing body is secured in the tensioning lever via any securing device. For a proposal of the invention, the bearing body with the clamping lever is releasably locked or locked. To name only a non-limiting example, can be used for locking the bearing body in the clamping lever a round wire insert, which is positively arranged in a groove of each of the bearing body and the clamping lever and changes its diameter when applying appropriate assembly or disassembly forces that this can escape from one of said grooves, whereby the assembly or disassembly is possible. But it is also possible, for example, that the securing device is a screw, in particular a grub screw or a threaded pin, by means of which the clamping lever is screwed to the bearing body. For example, the bearing body may have a transverse to the pivot axis oriented blind hole threaded hole, while the bearing body has on the underside aligned in the mounted position with the blind hole threaded through hole or through hole. Through this, the screw can then be screwed in the mounted position of the bearing body in the recess of the clamping lever with the blind hole. A protruding from the blind hole threaded head or an end portion of the screw can then with or without play the bearing body in the recess of the clamping lever axially and / or secure against rotation, since the head or end of the screw between the boundary surfaces of the through hole or through-hole of Tension lever is caught. Here, the shape and / or dimensions on the one hand of the head or end portion of the screw and on the other hand, the Durchgangsausnehmung or through hole of the clamping lever, the size of any game in the axial direction and / or in terms of a rotation are given constructive. To mention just another non-limiting example may also be a screw, in particular a grub screw to be screwed into a through thread of the clamping lever, wherein an inner end face of the screw can positively engage in a recess or groove of the bearing body or bearing body part. In the event that two bearing body parts are inserted into a through-hole or two blind hole recesses of the clamping lever, they can each be locked with the clamping lever, locked or screwed.

The pivot axis and a degree of freedom of movement of the bearing body relative to the clamping rail, in particular a translational (shift) degree of freedom, define a plane. For a possible embodiment form the slide rail bearing surface, in this case is formed, and / or the bearing surface of the clamping rail with respect to this plane an angle β of 0 °. It is also possible, however, for the tensioning rail bearing surface and / or the bearing surface of the tensioning rail to be inclined at an angle β not equal to zero with respect to the said plane. This may possibly improve the guidance between the bearing body and the tensioning rail during the displacement along the shift degree of freedom. Possibly, as a result, the force relationships between the bearing body and the clamping rail can be improved. Thus, for example, as a result of the inclination by the angle β springing of vertical walls of the clamping rail due to the high-acting clamping force can be at least reduced. For example, an angle β may be in the range of 3 ° to 14 ° (in particular 4 ° to 10 ° or 5 ° to 9 °).

It is quite possible that the bearing body (except for any securing elements such as a round wire ring) is integrally formed. In this case, the one-piece bearing body is inserted laterally into a passage recess of the clamping lever, so that it protrudes on both sides of the clamping lever, whereby a recording of the protruding ends of the bearing body in the clamping rail is possible. For a particular proposal of the invention, however, the bearing body has two bearing body parts. The bearing body parts each form a clamping rail bearing surface and a clamping lever bearing surface. The two bearing body parts are inserted from both sides in the direction of the pivot axis in at least one recess of the clamping lever. It is possible that here an insertion of the bearing body parts in a passage-recess of the clamping lever, which may have a constant cross-section or may be formed stepped, takes place. It is also possible that the two bearing body parts are each inserted into an associated recess of the clamping lever, which can then be designed as a non-stepped or stepped blind hole recess. For this inventive design of the bearing body with two bearing body parts is a division of the forces between bearing body and clamping lever and on the other hand between the bearing body and clamping rail on the two bearing body parts. Here u. U. be the two bearing body parts formed identically, which increases the DC component and the production is simplified. On the other hand, u. U. the production of the bearing body with two bearing body parts are simplified compared to the production of a one-piece bearing body.

There are many possibilities for the geometry of the bearing body parts. According to a proposal of the invention, the bearing body parts each have two disk bodies arranged offset from one another, which can be directly connected to one another or between which a connecting web or a connecting region can extend. A disk body in this case forms the convex clamping lever bearing surface, while the other disk body forms the clamping rail bearing surface. Here, the disk body that forms the clamping rail bearing surface, preferably in the vertical direction with a clearance or play caught in a guide groove of the clamping rail. About the constructive specification of the relative position of the two disk body in the height direction, a design specification of the height of the pivot axis relative to the guide groove of the clamping rail can be done.

Preferably, the bearing body parts in addition to the said disk bodies and a possible connecting web or connecting region each have a pin, via which the bearing body parts are releasably connected to the clamping lever, in particular latched or locked. On the pins so that the bearing body parts can be connected to the clamping lever to a preassembled mounting unit in which the bearing body parts are held captive on the clamping lever. This preassembled mounting unit can then be used in the clamping rail.

As mentioned above, the relative position of the convex tension lever bearing surface and the tensioning rail bearing surface of a bearing body part may be arbitrary, the distance of which determines the height of the pivot axis relative to the tensioning rail. For an embodiment of the invention, the pivot axis extends through a connecting region of the two disk body or in the height direction between the clamping lever bearing surface and the clamping rail bearing surface, resulting in a particularly compact design.

The aforementioned disk body can have any desired disk thickness, which can be constant for a particularly simple embodiment. For a proposal of the invention, the disk body forming the tension rail bearing surface has a downwardly decreasing disk thickness. This embodiment is based on the finding that a reduction in the thickness of the disc body of this disc body down no negative impact on the strength of the bearing body, since the upper portions of the disc body are primarily claimed here. On the other hand, investigations by the applicant have shown that in the case of tensioning rails, in particular the transition region or the corner between vertical lateral walls and a base plate can fail at high clamping forces. The design of the disk body with downwardly decreasing disk thickness here allows a reinforcement of the clamping rail in said transition region or the corner. The nature of Reduction of the disc thickness of the disc body down can be arbitrary. For a refinement according to the invention, the pane body is reduced downwards by means of a chamfer with regard to its pane thickness.

Another solution to the problem underlying the invention is provided by a bearing body part for a clamping tool of the type described above. Such a bearing body part has two mutually offset disk body. In this case, a disk body forms a convex tension lever bearing surface, while the other disk body forms a (preferably flat) tension rail bearing surface. The bearing body part further has a pin, via which the bearing body part (preferably releasably) with a clamping lever is connectable. The disk body forming the tension rail bearing surface, the disk body forming the convex tension lever bearing surface, and the pin are sequentially connected to each other in order in the direction of the pivot axis.

Advantageous developments of the invention will become apparent from the claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the description are merely exemplary and can take effect alternatively or cumulatively, without the advantages having to be achieved by embodiments according to the invention. Without thereby altering the subject matter of the appended claims, as regards the disclosure of the original application documents and the patent, further features can be found in the drawings, in particular the illustrated geometries and the relative dimensions of several components and their relative arrangement and operative connection. 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 be combined with features of different claims. Likewise, in the claims listed features for further embodiments of the invention can be omitted.

The features mentioned in the claims and the description are to be understood in terms of their number, that is exactly this number or a larger number than said Number exists without requiring an explicit use of the adverb "at least". For example, when talking about an element, it should be understood that there is exactly one element, two elements or more elements. These features may be supplemented by other features or be the only characteristics that make up the product in question.

The reference numerals contained in the claims do not limit the scope of the objects protected by the claims. They are for the sole purpose of making the claims easier to understand.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

zeigt in einer Seitenansicht und teilgeschnitten ein Spannwerkzeug, wobei von einem Spannhebel abgedeckte Kanten durchgezogen dargestellt sind.

Fig. 2

zeigt in einer Seitenansicht und teilgeschnitten einen Spannhebel eines Spannwerkzeugs gemäß Fig. 1.

Fig. 3

zeigt den Spannhebel gemäß Fig. 2 in einem Schnitt III-III.

Fig. 4

zeigt in einer Seitenansicht ein Lagerkörperteil.

Fig. 5

zeigt das Lagerkörperteil gemäß Fig. 4 in einer Vorderansicht.

Fig. 6

zeigt einen Schnitt VI-VI durch das Spannwerkzeug gemäß Fig. 1.

Fig. 7

zeigt in einem Detail die Wechselwirkung des Lagerkörpers gemäß Fig. 4 bis 5 mit dem Spannhebel gemäß Fig. 2 und 3.

Fig. 8

zeigt eine alternative Ausgestaltung eines Spannwerkzeugs in einer geschnittenen Darstellung entsprechend Fig. 6.

Fig. 9

zeigt eine alternative Ausgestaltung eines Lagerkörperteils in einer Seitenansicht.

Fig. 10

zeigt das Lagerkörperteil gemäß Fig. 9 in einer Vorderansicht.

Fig. 11

zeigt ein alternatives Spannwerkzeug in einer geschnittenen Darstellung bei Schnittführung entsprechend Fig. 6 und 8 mit einem Lagerkörperteil gemäß Fig. 9 und 10.

Fig. 12

zeigt eine weitere Ausgestaltung eines Lagerkörpers in einer Seitenansicht.

Fig. 13

zeigt den Lagerkörper gemäß Fig. 12 in einer Vorderansicht.

Fig. 14

zeigt eine alternative Ausgestaltung eines Spannwerkzeugs in einer geschnittenen Darstellung bei Schnittführung entsprechend Fig. 6, 8 und 11 mit dem Lagerkörper gemäß Fig. 12 und 13.

Fig. 15

zeigt in einer Vorderansicht einen Lagerkörper mit einer Sackloch-Gewindebohrung für eine Schraube, mittels welcher der Lagerkörper in einer Ausnehmung des Spannhebels gesichert werden kann.

Fig. 16

zeigt eine alternative Ausgestaltung eines Spannwerkzeugs in einer geschnittenen Darstellung bei Schnittführung entsprechend Fig. 6, 8, 11 und 14 mit dem Lagerkörper gemäß Fig. 15.

Fig. 17

zeigt in einer Vorderansicht ein Lagerkörperteil mit einer Sackloch-Gewindebohrung für eine Schraube, mittels welcher das Lagerkörperteil in einer Ausnehmung des Spannhebels gesichert werden kann.

Fig. 18

zeigt eine alternative Ausgestaltung eines Spannwerkzeugs in einer geschnittenen Darstellung bei Schnittführung entsprechend Fig. 6, 8, 11, 14 und 16 mit dem Lagerkörperteil gemäß Fig. 17.

Fig. 19

zeigt eine alternative Ausgestaltung eines Spannwerkzeugs in einer geschnittenen Darstellung bei Schnittführung entsprechend Fig. 6, 8, 11, 14, 16 und 18.

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

Fig. 1

shows a side view and partially cut a clamping tool, wherein covered by a clamping lever edges are shown in solid.

Fig. 2

shows in a side view and partially cut a clamping lever of a clamping tool according to Fig. 1 ,

Fig. 3

shows the cocking lever according to Fig. 2 in a section III-III.

Fig. 4

shows a side view of a bearing body part.

Fig. 5

shows the bearing body part according to Fig. 4 in a front view.

Fig. 6

shows a section VI-VI by the clamping tool according to Fig. 1 ,

Fig. 7

shows in a detail the interaction of the bearing body according to 4 to 5 with the clamping lever according to Fig. 2 and 3 ,

Fig. 8

shows an alternative embodiment of a clamping tool in a sectional view accordingly Fig. 6 ,

Fig. 9

shows an alternative embodiment of a bearing body part in a side view.

Fig. 10

shows the bearing body part according to Fig. 9 in a front view.

Fig. 11

shows an alternative clamping tool in a sectional view at cutting accordingly Fig. 6 and 8th with a bearing body part according to Fig. 9 and 10 ,

Fig. 12

shows a further embodiment of a bearing body in a side view.

Fig. 13

shows the bearing body according to Fig. 12 in a front view.

Fig. 14

shows an alternative embodiment of a clamping tool in a sectional view when cut accordingly Fig. 6 . 8th and 11 with the bearing body according to Fig. 12 and 13 ,

Fig. 15

shows a front view of a bearing body with a blind hole for a screw, by means of which the bearing body can be secured in a recess of the clamping lever.

Fig. 16

shows an alternative embodiment of a clamping tool in a sectional view when cut accordingly Fig. 6 . 8th . 11 and 14 with the bearing body according to Fig. 15 ,

Fig. 17

shows in a front view of a bearing body part with a blind hole for a screw, by means of which the bearing body part can be secured in a recess of the clamping lever.

Fig. 18

shows an alternative embodiment of a clamping tool in a sectional view when cut accordingly Fig. 6 . 8th . 11 . 14 and 16 with the bearing body part according to Fig. 17 ,

Fig. 19

shows an alternative embodiment of a clamping tool in a sectional view when cut accordingly Fig. 6 . 8th . 11 . 14 . 16 and 18 ,

DESCRIPTION OF THE FIGURES

Fig. 1 shows a clamping tool 1 in a side view. The clamping tool 1 is intended, with a clamping plate, a clamping table, a wall u. Ä., In particular in the area of a T-slot with a slot nut inserted therein, to be screwed and a clamping lever 2 a workpiece with the clamping table, the clamping plate, the wall u. Ä. To clamp. A generation of a clamping force takes place here by means of the clamping lever 2, a clamping rail 3, a clamping screw 4 and a bearing body 5, which may be formed with two bearing body parts 6, 7. Thus, the clamping tool 1 can also be referred to as a "four-part clamping tool", even if other attachments are available. It is also possible that the clamping tool 1 is not screwed with the clamping rail 3 directly on a clamping table or a clamping plate, but between clamping table or clamping plate and clamping tool a structural element is interposed, as this is described in the current prospectus of the Applicant and which to increase the Height of the pivot axis 10 relative to the clamping plate or the clamping table is used.

In Fig. 2 the tensioning lever 2 is shown in a side view. The clamping lever 2 has a front clamping lever segment 8 and a rear clamping lever segment 9. The free end region of the front clamping lever segment 8 can be clamped directly against the workpiece with a clamping jaw. It is also possible that at the end region of the front clamping lever segment 8 pivotally vertical to a pivot axis 10 of the clamping lever 2, which is vertical to the plane according to Fig. 2 is oriented, a workpiece sa plate is mounted, which is pressed with the clamping force against the workpiece. To be merely another, non-limiting example, a tensioning chain can be hinged to the free end portion of the front tension lever segment 8 in a conventional manner.

With respect to the pivot axis 10, the bore axis of the threaded bore 11 has a distance or lever arm 12. In the region of the pivot axis 10, the tension lever 2 has a bulge 13 downwards. Here, the clamping lever 2 has a coaxial with the pivot axis 10 oriented through hole 14 with a radius 15. As in particular in the section III-III according to Fig. 3 can be seen, the through hole 14 passes via steps 16a, 16b arranged in on opposite sides of the clamping lever 2 Recesses 17a, 17b, which have a larger cross section than the through hole 14. Adjacent the recesses 17a, 17b, the through hole 14 has two circumferential grooves 18a, 18b about the pivot axis 10.

The recesses 17a, 17b are edge-closed and bounded by a circumferential wall 19a, 19b, which is oriented parallel to the pivot axis 10. In a lower first partial cross-section 20a, 20b, which extends in the circumferential direction about the pivot axis 10 through an angle α (reference numeral 21), which is preferably 120 ° to 150 °, the walls 19a, 19b are formed as partial cylinder segments 22a, 22b. The partial cylinder segments 22a, 22b have a radius r (reference numeral 23), wherein the cylinder axis corresponds to the pivot axis 10. Away from the partial cross-section 20 and in the circumferential angular ranges outside the angle α (reference numeral 21), namely in a second partial cross-section 24a, 24b, form the walls 19a, 19b partial cylinder segments 25a, 25b with a radius R (reference numeral 26). Here, the radius R (reference 26) is greater than the radius r (reference 23). The transition between the partial cross-sections 20, 24 is preferably not via a step, but gradually or with a curved profile in cross-section.

Fig. 4 and 5 Since the bearing body parts 6, 7 are identical, the description is based on the bearing body part 6. The bearing body part 6 is formed with disk bodies 27, 28 and a pin 29, wherein for the illustrated embodiment, the disk body 27th , the disk body 28 and the pin 29 in this order in the direction of the pivot axis 10 directly adjacent to each other and are integrally formed by the bearing body part 6. The disk body 27 has on its upper side, here above the pivot axis 10, a here flat clamping rail bearing surface 30 and on its underside a lower, here also flat clamping rail bearing surface 31 on. The tensioning rail bearing surface 30 and the tensioning rail bearing counter surface 31 have a height h in the height direction (reference numeral 40). In the side view according to Fig. 4 the outer surface of the disk body 27 passes over rounded portions 32, 33 from the tensioning rail bearing surface 30 into the tensioning rail bearing surface 31.

The disk body 27 is integrally via a connection region 34, which is here formed by an overlap of the disk body 27, 28, into the disk body 28, which is arranged offset to the disk body 27.

The disk body 27 has a cylindrical lateral surface 35 with a radius r (reference numeral 23), which corresponds to a play or transition fit the radius of the first partial cylinder segment 22 of the recess 17 of the clamping lever 2. The cylindrical lateral surface 35 is arranged coaxially to the pivot axis 10. Via a connecting region 36 of the disk body 28 goes over into the pin 29. The pin 29 has a circumferential groove 37. The distance of the groove 37 from an end face 38 of the disk body 28 corresponds approximately to the distance of the groove 18 from the step 16 or is slightly larger than this. It is possible that the pin 29 in the outer end region has a chamfer 39 or insertion bevel. The diameter of the pin 29 forms a play or transition fit with the diameter of the through hole 14 of the clamping lever. 2

In the Fig. 1 and 6 the tensioning rail 3 is shown in a longitudinal or cross section. The tensioning rail 3 has a roughly U-shaped cross section with a base leg 41 and parallel side legs 42, 43. The base leg 41 forms a bottom plate 44 of the tensioning rail 3, with which the tensioning rail 3 rests on a clamping table or a clamping plate. The bottom plate 44 has (here two) mounting holes 45, 46 which are formed as stepped through holes and over which the clamping rail 3 in the region of the bottom plate 44 with a clamping table or a clamping plate, in particular one in a T-slot of the clamping table or the clamping plate arranged sliding block, can be screwed. The mounting holes 45, 46 are formed so widened away in the direction of the clamping plate or the clamping table that in the bottom plate 44, a head of a fastening screw can be accommodated without the head of the fastening screw protruding from the bottom plate 44 upwards. For further details on the design of the mounting holes 45, 46 in order to enable a good power transmission and fatigue strength and alternative embodiments with the use of a slot and a power transmission between the fastening screw and bottom plate 44 improving intermediate piece is in particular the document EP 1 955 816 A2 directed.

The side legs 42, 43 form vertically extending walls 47a, 47b of the tensioning rail 3. In the end portions facing away from the base leg 41 and the bottom plate 44, the walls 47a, 47b have an inwardly oriented transverse web 48a, 48b. Lateral guide grooves 49a, 49b have a cross-section corresponding to a horizontal U, wherein the bottom of the guide grooves 49a, 49b is formed by the walls 47a, 47b, while the sides of the guide grooves 49a, 49b are limited by the transverse webs 48a, 48b and the bottom plate 44. The here horizontally oriented underside of the transverse webs 48a, 48b forms a bearing surface 50a, 50b. A lower bearing counter surface 51 a, 51 b is formed by the bottom plate 44. Thus, the guide grooves 49a, 49b are bounded by the bearing surfaces 50a, 50b and the bearing opposing surfaces 51a, 51b in the height direction. The bearing surface 50a, 50b and the bearing counter surface 51a, 51b have a distance H in the vertical direction (reference numeral 52), wherein the distance H (reference numeral 52) is greater than or a clearance fits with the distance h (reference numeral 40).

Fig. 6 shows the clamping tool 1 in the assembled state. For the assembly of the bearing body 5 with the tensioning lever 2, suitable round wire rings 53a, 53b are first inserted into the grooves 37a, 37b of the pins 29 of the bearing body parts 6, 7. Following this, the pins 29 of the bearing body parts 6, 7 with round wire rings 53 arranged thereon are inserted into the tensioning lever 2, namely the through-bore 14. The round wire rings 53 engage in the grooves 18 of the clamping lever 2, whereby the bearing body parts 6, 7 captive and releasably held on the clamping lever 2.

As in the Fig. 6 and 7 can be seen, is arranged in such mounted state of the bearing body parts 6, 7 of the disk body 28 in the associated recess 17, wherein the cylindrical surface 35 of the disk body 28 in the first partial cross section 20 of the recess 17 abuts, while in the second partial cross section 24 between the Recess 17 and the cylindrical surface 35 of the disk body 28, a gap 54 remains.

For the radius r of the cylindrical lateral surface 35 and the radius r of the recess 17 in the first partial cross section 20, a play or transition fit is preferably selected, so that a rotation of the disc body 28 and thus of the bearing body part 6, 7 relative to the clamping lever 2 is possible. In such state used in the clamping lever 2 and secured thereto state of the bearing body parts 6, 7, an outer surface 55 of the disk body 28 is arranged flush with the outer surface of the clamping lever 2 or this is slightly above the outer surface of the clamping lever 2 via. Such a preassembled unit from the clamping lever 2 and the bearing body 5, here the bearing body parts 6, 7, is then inserted from the front into the clamping rail 3. The clamping rail 3 forms for this purpose an upwardly open T-slot, wherein the vertical leg of the inverted T is bounded by the end faces of the transverse webs 48a, 48b, while the transverse leg of the T formed by the guide grooves 49a, 49b become. The tensioning lever 2 extends exclusively in the region of the vertical leg of the T, while in the transverse legs of the T, the two disk bodies 27a, 27b are arranged. The disk body 28a, 28b and the pins 29a, 29b extend (in the recess 17 and the through hole 14) in the region of the vertical leg of the T and in the interior of the clamping lever 2. For the insertion of the clamping lever 2 with the bearing body parts 6, 7 held thereon the slide rail bearing surfaces 30a, 30b of the two bearing body parts 6, 7 are arranged in a horizontal plane. The same applies to the slide rail bearing mating surfaces 31a, 31b, wherein the bearing body parts 6, 7 are rotated so that the clamping rail bearing mating surfaces 31a, 31b are in the lowest pivoting position. In this orientation of the bearing body parts 6, 7, the disk body 27a, 27b can be inserted into the guide grooves 49a, 49b of the clamping rail 2. For such imported state, the bearing body parts 6, 7 and the clamping lever 2 are trapped in the clamping rail 3. Regardless of the additional locking action of the round wire rings 53a, 53b, the bearing body parts 6, 7 can not escape from the tensioning lever 2 as a result of the lateral play-bearing or play-free contact and guidance on the walls 47a, 47b of the tensioning rail 3.

Is according to Fig. 1 into the threaded bore 11, the clamping screw 4 is screwed and this is based with the front side, in particular with a pivotally mounted or ball joint plate 56, on the bottom plate 44 of the clamping rail 3 from at the same time conditioning the clamping lever 2 on a workpiece, generates the clamping tool. 1 the desired clamping force. This clamping force has the consequence that the bearing body parts 6, 7 are pressed against the bearing surfaces 50a, 50b of the tensioning rail 3 with the tensioning rail bearing surfaces 30a, 30b. Simultaneously, the clamping lever 2 in the first partial cross section 20a, 20b, which forms a cylinder-segment-shaped bearing surface 57a, 57b, pressed against the underside of the cylindrical lateral surface 35 of the disk body 28, whereby the corresponding partial cross section of the cylindrical lateral surface 35 of the bearing body parts 6, 7 a Spannhebel- Storage surface 58a, 58b forms.

For the illustrated embodiment, the pivot axis 10 is disposed within the cross section of the clamping rail 3. Here even the disk body 28 and thus the bearing body parts 6, 7 do not protrude beyond the upper side of the tensioning rail 3. It is quite possible that the offset of the disk body 27, 28 is greater, so that the pivot axis 10 can be further displaced upwards. It is even possible that the disk body 27, 28 have no overlap, but are offset in the vertical direction to each other, wherein then an additional connection via a connection region 34, for example a connecting web or an additional disk body, can take place.

A part of the acting clamping force can be transmitted between the bearing body part 6, 7 and clamping lever 2 via the pin 29. However, this is preferably not the case, and the pin 29 is used exclusively for the pre-assembly of the bearing body parts 6, 7 on the clamping lever. 2

Without acting clamping force of the clamping lever 2 with the bearing body 5, here the bearing body parts 6, 7, in the clamping rail 3 along a translational degree of freedom 59 slidably. With actuation of the clamping screw 4 and the clamping of a workpiece, a pivoting of the clamping lever 2 along a rotational degree of freedom 60 about the pivot axis 10 takes place.

Fig. 8 shows a modified embodiment of a clamping tool 1, in which the disk body 27a, 27b do not have a constant disk thickness, but rather have a chamfer 62 down, so that the disk thickness decreases downwards. This refinement is based on the knowledge that the tensioning rail 3 is subjected to high tension forces and has shown that a failure of the tensioning rail preferably takes place in the transition region from the base plate 44 to the lateral walls 47a, 47b, in particular due to a notch effect in the region of a corner 61. As a result of the illustrated beveling of the disk body 27, an inclination of the walls 47a, 47b can take place so that angling in the area of the corners 61a, 61b does not take place with an angle of 90 °, but rather with an angle which is greater than 90 °, for example in the range of 90 ° to 110 ° or 92 ° to 105 °, takes place, which can result in a better stress distribution in the tensioning rail 3. On the other hand, it is possible for this embodiment that the lateral walls 47a, 47b have a greater wall thickness, in particular in the region of the corners 61a, 61b.

For the embodiments described above, the tensioning rail bearing surfaces 30a, 30b of the bearing body parts 6, 7 and the bearing surfaces 50a, 50b of the tensioning rail 3 were oriented horizontally. Fig. 9 to 11 show an embodiment which basically the embodiment according to Fig. 1 to 7 equivalent. However, here are the clamping rail bearing surfaces 30a, 30b of the bearing body parts 6, 7 and the bearing surfaces 50a 50b of the clamping rail 3 by an angle β (reference numeral 63) in the direction of the interior of the clamping rail 3 downwardly inclined. Without if this is absolutely the case, the tensioning rail bearing counter surfaces 31a, 31b of the bearing body parts 6, 7 and the bearing counter surfaces 51a, 51b of the tensioning rail 3 can also be inclined. An embodiment with at least inclined clamping rail bearing surfaces 30 and bearing surfaces 50 is used in particular for a tensioning rail 3, which is made of a drawn profile.

In Fig. 12 to 14 an embodiment is shown in which the bearing body 5 is integrally formed. Here, the bearing body parts 6, 7 have only the disk body 27a, 27b and 28a, 28b and not via pins 29a, 29b. Rather, the inner disk body 28 are connected via a connecting portion 64 directly to each other. The disk body 28a, 28b thus have a continuous cylindrical surface 35. However, in this continuous cylindrical surface 35 u. U. a circumferentially circumferential groove 65 is provided. In the groove 65, a round wire ring 66 is arranged. For the illustrated embodiment, the clamping lever 2 does not have the through hole 14, which merges via the step 16 in the recess 17. Rather, a non-stepped, continuous recess 16a, 16b provided in the clamping lever 2, wherein for the cross section of the recess 16a, 16b can basically apply to the other embodiments said. In the recess 16a, 16b may be centrally present a circumferential groove, so that the bearing body 5 can be latched on the round wire ring 66 in the clamping lever 2. Again, the bearing body 5 is located with the clamping rail bearing surfaces 30a, 30b on the bearing surfaces 50a, 50b of the clamping rail 3 with the clamping force. The tensioning lever 2 is supported by the bearing surface 57a, 57b on the tensioning lever bearing surface 58a, 58b.

Fig. 15 shows a bearing body 5, which except for the differences described below the bearing body according to Fig. 13 equivalent. The bearing body 5 has here but not a groove 65 for securing the bearing body 5 in the clamping lever 2. Rather, the bearing body 5 has centrally to its longitudinal axis or to the pivot axis 10 and from its underside via a blind hole threaded hole 67 which transverse to Swivel axis 10 is oriented.

Fig. 16 shows the bearing body 5 according to Fig. 15 in built-in the clamping lever 2 state. It can be seen here that the clamping lever 2 has on its underside a through-hole 68 or through-bore 69, which is oriented coaxially with the blind-hole threaded hole 67 in the mounted state. Through the through hole 69 is connected to the blind hole 67 a screw 70, screwed here a threaded pin 71. An end portion or head 72 of the screw 70 is without play or, as in Fig. 16 shown caught with play in the direction of the pivot axis 10 and / or in the circumferential direction about the pivot axis 10 in the through hole 69. In this way, the bearing body 5 can be preassembled in the clamping lever 2 and used as a structural unit in the clamping rail 3.

Fig. 17 shows a bearing body part 6, 7, which except for the differences described below the bearing body part 6, 7 according to Fig. 4 and 5 equivalent. The bearing body part 6, 7 here but does not have a groove 37 for securing the bearing body part 6, 7 in the clamping lever 2. Rather, the bearing body part 6, 7 has a blind hole threaded hole 67, which emanates from the bottom of the bearing body part 6, 7 and is oriented transversely to the pivot axis 10.

Fig. 18 shows bearing body parts 6, 7 according to Fig. 17 in built-in the clamping lever 2 state. It can be seen here that the clamping lever 2 has on its underside passage recesses 68a, 68b or through holes 69a, 69b, which are oriented in the mounted state coaxially with the blind-threaded holes 67a, 67b of the bearing body parts 6, 7. Through the through-holes 69a, 69b, screws 70a, 70b (in this case threaded pins 71a, 71b) are screwed to the blind-threaded bores 67a, 67b. The end portions or heads 72a, 72b of the screws 70a, 70b are without play or, as in FIG Fig. 18 shown caught with play in the direction of the pivot axis 10 and / or in the circumferential direction about the pivot axis 10 in the through holes 69a, 69b. In this way, the bearing body parts 6, 7 can be preassembled in the tensioning lever 2 and used as a structural unit in the tensioning rail 3.

Fig. 19 shows a further embodiment of the invention, in which the lower side of the clamping lever 2 transverse to the pivot axis 10 oriented through-threaded holes 74a, 74b, in which screws 70a, 70b, here grub screws 75a, 75b are screwed. The screws 70a, 70b have a non-planar, but convex (here conical or beveled) end face. The pins 29a, 29b in this case have circumferential grooves 76a, 76b whose cross sections correspond to the cross sections of the end faces of the screws 70a, 70b. When the screws 70a, 70b are screwed in, the end faces of the screws 70a, 70b enter the grooves 76a, 76b, with which the pins 29a, 29b and thus the bearing body parts 6, 7 are secured in the bearing body 2 in a form-fitting manner in the direction of the pivot axis 10. If the end faces of the screws 70a, 70b are not pressed against the grooves 76a, 76b, despite the axial securing a rotation of the bearing body parts 6, 7 relative to the clamping lever 2 possible. If, however, as a result of screwing the end faces of the screws 70a, 70b pressed against the grooves 76a, 76b, the bearing body parts 6, 7 in addition to the positive locking in the axial direction frictionally secured against rotation relative to the bearing body 2. In the securing devices 73 formed in this way, a positive locking of the bearing body parts 6, 7, which can only be solved by unscrewing the screws 70.

For a modified embodiment, however, a locking element such as a detent ball and a detent spring is used in the through-threaded bore 74, wherein the locking element protrudes on the side facing the pin 29 from the clamping lever 2 in the direction of the pin 29, without the clamping lever 2 on this Side escape, the detent spring is biased in the direction of the groove 76 via a screwed into the through-threaded bore 74 screw 70 and is applied in this way the locking element in the direction of the groove 76, a connection of the bearing body parts 6, 7 with the Tensioning lever 2 via a latching connection.

According to the embodiments according to 15 to 19 form the screws 70 a securing device 73, while for the unillustrated embodiment, the securing device 73 is formed with the screw 70, the detent spring and the locking element and the groove 76 and for the other illustrated embodiments, the securing device 73 is formed as a round wire ring 53. However, any other securing devices can be used in a clamping tool 1 according to the invention. It is also possible that the safety devices 73 shown here are used for other exemplary embodiments shown here or for non-illustrated exemplary embodiments of the invention. Thus, securing devices 73, which are shown here in connection with a one-piece bearing body 5, can also be used for securing bearing body parts 6, 7 (and vice versa).

The same or corresponding components of an embodiment or different embodiments are partially identified by the same reference numerals, which may be distinguished in the same embodiment with a supplementary letter a, b. These components are then in the drawings and / or the description partially with and without the additional letter a, b reference.

A power transmission between the clamping lever 2 and the bearing body 5 and the bearing body parts 6, 7 is not via a line contact, but in the partially cylindrical partial cross section 20, that is, over a curved surface, whereby a surface pressure can be reduced. A power transmission between the bearing body 5 and the bearing body parts 6, 7 does not take place via a line contact, but via the preferably flat clamping rail bearing surface 30th

The clamping tool according to the invention does not serve for axial clamping of a workpiece with a clamping force which is oriented parallel to the clamping table. Rather, a clamping force is generated, which tensions the workpiece on the clamping table, so that the clamping force is oriented substantially vertically to the clamping surface of the clamping table.

LIST OF REFERENCE NUMBERS

1

clamping tool

2

clamping lever

3

tensioning rail

4

clamping screw

5

bearing body

6

Bearing body part

7

Bearing body part

8th

front tension lever segment

9

rear tension lever segment

10

swivel axis

11

threaded hole

12

lever arm

13

bulge

14

Through Hole

15

radius

16

step

17

recess

18

groove

19

wall

20

first partial cross-section

21

Angle α

22

Partial cylinder segment

23

Radius r

24

second partial cross section

25

Partial cylinder segment

26

Radius R

27

washer body

28

washer body

29

spigot

30

Clamping rail storage area

31

Clamping rail bearing mating surface

32

rounding off

33

rounding off

34

connecting area

35

cylindrical surface

36

connecting area

37

groove

38

front

39

chamfer

40

Distance h

41

base leg

42

side leg

43

side leg

44

baseplate

45

mounting hole

46

mounting hole

47

wall

48

crosspiece

49

guide

50

upper bearing surface of the clamping rail

51

Lower bearing surface of the clamping rail

52

Distance H

53

Round wire ring

54

gap

55

outer surface

56

Plate

57

Bearing surface of the clamping lever in the first partial cross-section

58

Clamping lever bearing surface

59

translatory degree of freedom

60

rotational degree of freedom

61

corner

62

bevel

63

Angle β

64

connecting area

65

groove

66

Round wire ring

67

Blind tapped hole

68

through recess

69

Through Hole

70

screw

71

Set screw

72

End area or head

73

safety device

74

Feed-through threaded bore

75

grub screw

76

groove

Claims (13)

1. Clamping tool (1) with

   a) a clamping bar (3),

   b) a clamping lever (2),

   c) a bearing body (5), on which the clamping lever (2) is mounted to be pivotable around a pivot axis (10) and which is displaceably guided in the clamping bar (3),

   d) the bearing body (5) comprising at least one convex clamping-lever bearing surface (58) and two clamping-bar bearing surfaces (30a, 30b), where the at least one convex clamping-lever bearing surface (58) is arranged between the two clamping-bar bearing surfaces (30a, 30b),

   e) the clamping lever (2) comprising at least one concave bearing surface (57) and

   f) the clamping lever (2) being mounted to be rotatable around the pivot axis (10) on the convex clamping-lever bearing surface (58) of the bearing body (5) via the at least one concave bearing surface (57) and the bearing body (5) being displaceably guided in the clamping bar (3) via the clamping-bar bearing surfaces (30),

   g) where the bearing body (5) is inserted into the clamping lever (2) in the direction of the pivot axis (10),

   h) the clamping lever (2) comprises at least one opening (17), which is realised with a closed edge in a cross section transverse to the pivot axis (10) and forms the concave bearing surface (57) via which the clamping lever (2) is mounted to be rotatable around the pivot axis (10) on the convex clamping-lever bearing surface (58) of the bearing body (5), and

   i) the at least one convex clamping-lever bearing surface (58) of the bearing body (5) is realised by a disc body (28) with a cylindrical or part-cylindrical cross section and/or the concave bearing surface (57) of the clamping lever (2) is realised to be partially cylindrical,

   characterised in that

   j) the opening (17) of the clamping lever (2) in the cross section transverse to the pivot axis (10)

   ja) comprises a partially cylindrical first partial cross section (20), the radius (23) of which corresponds to the radius of the cylindrical or partially cylindrical disc body (28) and which forms the concave bearing surface (57) of the clamping lever (2) which is pivotably contacted by the disc body (28) of the bearing body (5) and

   jb) comprises a second partial cross section (24), in the region of which the opening (17) of the clamping lever (2) forms an interspace (54) with the bearing body (5) when the bearing body (5) with the disc body (28) rests against the concave bearing surface (57) of the clamping lever (2) formed by the first partial cross section (20).
2. Clamping tool (1) according to claim 1, characterised in that the partially cylindrical first partial cross section (20) comprises a circumferential angle α (21) in the range of 120° to 150°.
3. Clamping tool (1) according to one of the preceding claims, characterised in that the at least one convex clamping-lever bearing surface (58) and the two clamping-bar bearing surfaces (30a, 30b) are arranged in the interior of the clamping bar (3).
4. Clamping tool (1) according to one of the preceding claims, characterised in that the bearing body (5) is secured in the clamping lever (2) via a securing device (73).
5. Clamping tool (1) according to claim 4, characterised in that the securing device (73)

   a) is realised as a latching or locking device,

   b) is formed with a round-wire ring (53),

   c) is formed with a screw (70) or

   d) is formed with a latching spring and a latching element.
6. Clamping tool (1) according to one of the preceding claims, characterised in that the clamping-bar bearing surface (30a, 30b) and/or the bearing surface (50) of the clamping bar (3) are/is inclined by an angle β (63) with respect to a plane defined by the pivot axis (10) and by the degree of freedom of displacement of the bearing body (5) relative to the clamping bar (3).
7. Clamping tool (1) according to one of the preceding claims, characterised in that the bearing body (5) comprises two bearing-body parts (6, 7) which each realise a clamping-bar bearing surface (30a, 30b) and a clamping-lever bearing surface (58) and are insertable into at least one opening (17) of the clamping lever (2) from both sides and in the direction of the pivot axis (10).
8. Clamping tool (1) according to claim 7, characterised in that the bearing-body parts (6, 7) each comprise two disc bodies (27, 28) arranged with an offset with respect to each other, where one disc body (28) realises the convex clamping-lever bearing surface (58) and the other disc body (27) realises the clamping-bar bearing surface (30a; 30b).
9. Clamping tool (1) according to claim 8, characterised in that the bearing-body parts (6, 7) each comprise a pin (29) by means of which the bearing-body parts (5, 6) are releasably connected to the clamping lever (2).
10. Clamping tool (1) according to claim 9, characterised in that the pivot axis (10) extends through a connecting region (34) of the two disc bodies (27, 28) or in a height direction between the clamping-lever bearing surface (58) and clamping-bar bearing surface (30).
11. Clamping tool (1) according to one of claims 8 to 10, characterised in that the disc body (27) realising the clamping-bar bearing surface (30) comprises a disc thickness decreasing downwardly.
12. Clamping tool (1) according to one of the preceding claims, characterised in that the bearing body, apart from possible securing elements, is realised as one part.
13. Clamping-tool bearing-body part for a clamping tool (1) according to one of the preceding claims, characterised in that

    a) two disc bodies (27, 28) arranged with an offset with respect to one another are present, where one disc body (28) forms a convex clamping-lever bearing surface (58) and the other disc body (27) forms a clamping-bar bearing surface (30), and

    b) a pin (29) is present, via which the bearing body part (6; 7) is connectable with a clamping lever (2),

    c) where the disc body (27) realising the clamping-bar bearing surface (30), the disc body (28) realising the convex clamping-lever bearing surface (58) and the pin (29) are connected with one another in this sequence.

Images