CLAMPING APPARATUS FOR CLAMPING-IN AN OBJECT, APPARATUS HAVING A CLAMPING APPARATUS AND VISE HAVING A CLAMPING APPARATUS

Abstract

A clamping apparatus includes a spindle body and a nut element to be screwed together for decreasing a spacing between first and second clamping elements to clamp an object disposed therebetween. The nut element has roller bodies with a defined roller engagement structure axially rotatably secured on a receiving body of the nut element and distributed in circumferential direction. A plurality of engagement regions distributed and/or spaced apart on the spindle body each have one spindle body engagement structure. The roller engagement structures of the roller bodies engage or can engage the spindle body engagement structures of the spindle body. The nut element can be screwed to the spindle body by the mutually engaged engagement structures of the spindle body and of the roller bodies, in particular with rolling of the roller bodies on the spindle body. An apparatus and a vise having the clamping apparatus are also provided.

Claims

1. A clamping apparatus for clamping-in an object, the clamping apparatus comprising: first and second clamping elements defining a spacing therebetween; a spindle body and a nut element to be screwed together by screwing actuation of at least one of said spindle body or said nut element to decrease said spacing for clamping-in an object disposed between said clamping elements; said nut element having a receiving body and a plurality of roller bodies with a defined roller engagement structure, said roller bodies being axially rotatably secured on said receiving body and distributed on said nut element in a circumferential direction; a plurality of engagement regions at least one of distributed or spaced apart from one another on said spindle body, each of said engagement regions having one respective spindle body engagement structure, said spindle body engagement structures of said spindle body being engaged by or configured to be engaged by said roller engagement structures of said roller bodies; and said nut element configured to be screwed to said spindle body by engagement of said engagement structures of said spindle body and of said roller bodies with one another.

2. The clamping apparatus according to claim 1, wherein: said receiving body of said nut element is sleeve-shaped, and said roller bodies of said nut element are cylindrical; said engagement regions are at least one of distributed or spaced apart from one another in the circumferential direction on said spindle body; and said engagement structures of said spindle body and of said the roller bodies are engaged with one another by rolling of said roller bodies on said spindle body.

3. The clamping apparatus according to claim 1, wherein said spindle body engagement structure of each spindle body engagement region is formed by a plurality of mutually spaced apart circumferential grooves forming webs running around an outer side of said spindle body, and said spindle body webs of each engagement region run parallel to one another.

4. The clamping apparatus according to claim 3, wherein said grooves of each spindle body engagement region form a spindle body thread, each spindle body thread extends from a starting region as far as an end region in the circumferential direction, and a thread pitch of each spindle body thread is constant, starting from said starting region toward said end region.

5. The clamping apparatus according to claim 1, wherein: each spindle body engagement region is assigned a receiving slot running in an axial direction, adjoining a respective spindle body engagement region in the circumferential direction, and having a contour adapted to said roller bodies; said roller bodies of said nut element are disposed with a part region in said receiving slots in a defined rotational position of said nut element relative to said spindle body; and when said roller bodies are disposed in said receiving slots, said engagement structures of said spindle body and of said roller bodies are out of engagement, and said nut element is displaceable in the axial direction relative to said spindle body.

6. The clamping apparatus according to claim 1, wherein: each spindle body engagement region has a recess adjoining a respective spindle body engagement region in the circumferential direction and being at least one of cylindrical or running in an axial direction; a rotational pin is axially rotatably secured in each respective recess, each rotational pin has a circumferential section with a rotational pin engagement structure corresponding to said spindle body engagement structures; and in a defined rotational position of said rotational pins, rotational pin engagement structures form a circumferential engagement structure together with said spindle body engagement structures.

7. The clamping apparatus according to claim 6, wherein: each rotational pin has a circumferential section with at least one of a recess or flattened portion; and in a defined rotational position of said rotational pins, said nut element is configured to be disposed with a part region of said roller bodies in said spindle body recesses causing said engagement structures of said spindle body and of said roller bodies to be out of engagement, and said nut element to be displaceable in the axial direction relative to said spindle body.

8. The clamping apparatus according to claim 1, wherein said plurality of spindle body engagement regions are configured on a first spindle section of said spindle body, said first spindle section is adjoined by a second spindle section of said spindle body, and a completely circumferential engagement structure to be brought into engagement with said roller engagement structure of said roller bodies is provided on said second spindle section.

9. The clamping apparatus according to claim 8, wherein said engagement structure of said second spindle section is formed by a thread with at least one circumferential thread groove, and said thread groove forms at least one web running helically around on an outer side of said spindle body.

10. The clamping apparatus according to claim 1, wherein said roller engagement structure of each roller body is formed by a plurality of circumferential grooves being mutually spaced apart in a roller axial direction and forming annular webs extending around a respective roller body in the circumferential direction.

11. The clamping apparatus according to claim 1, wherein each roller body has bearing journals protruding on an end side and axially rotatably securing a respective roller body on said receiving body of said nut element.

12. The clamping apparatus according to claim 1, wherein each roller body is axially rotatably mounted by said bearing journals in an annular or circularly annular bearing cage of said nut element.

13. The clamping apparatus according to claim 12, wherein said annular bearing cage has a multiple-piece configuration with a plurality of ring segment elements having rectangular cross sections, and at least part of said ring segment elements are associated with at least one roller body.

14. The clamping apparatus according to claim 12, wherein said nut element has a plurality of said bearing cages being spaced apart from one another in an axial direction, and a plurality of roller bodies are axially rotatably mounted in each respective bearing cage.

15. The clamping apparatus according to claim 1, wherein said sleeve-shaped receiving body has at least one receiving body engagement structure placing said receiving body in engagement with said roller engagement structure of said roller bodies.

16. The clamping apparatus according to claim 15, wherein said receiving body engagement structure is formed by a plurality of mutually spaced apart circumferential grooves forming annular webs extending around an inner side of said receiving body in the circumferential direction.

17. The clamping apparatus according to claim 14, wherein said sleeve-shaped receiving body has at least one recess running in the circumferential direction on an inner side, receiving said at least one annular bearing cage and adapting its contour, and a wall region of said sleeve-shaped receiving body delimits a bottom side of said recess and forms said receiving body engagement structure.

18. The clamping apparatus according to claim 1, wherein said spindle body engagement structures extend over an axial length of said spindle body being multiple times greater an axial length of said roller bodies.

19. The clamping apparatus according to claim 1, wherein: said spindle body has a screw head, said nut element forms said first clamping element, and said screw head forms said second clamping element; said nut element has a drive profile being movable in an axial direction toward said screw head by rotational actuation in a first rotational direction relative to said spindle body by said mutual engaged engagement structures for clamping-in the object; and said nut element is movable in the axial direction away from said screw head by rotational actuation in a second rotational direction opposed to the first rotational direction relative to said spindle body by said mutually engaged engagement structures.

20. The clamping apparatus according to claim 1, wherein: said spindle body is axially rotatably secured on a first clamping jaw element with a first clamping jaw, said nut element is co-rotationally fixedly secured on a second clamping jaw element with a second clamping jaw, said first clamping jaw forms said first clamping element, and said second clamping jaw forms said second clamping element; said first clamping jaw is movable toward said second clamping jaw by rotational actuation of said spindle body in a first rotational direction relative to said nut element by said mutually engaged engagement structures for clamping-in the object; and said first clamping jaw is movable away from said second clamping jaw by rotational actuation of said spindle body in a second rotational direction opposed to the first rotational direction relative to said nut element by said mutually engaged engagement structures.

21. An apparatus, comprising: a clamping apparatus according to claim 19; and a plurality of components to be connected to one another by said clamping apparatus; each of said components having a continuous recess through which said spindle body is guided; and said components being clamped-in between said nut element and said screw head of said spindle body.

22. A vise, comprising a clamping apparatus according to claim 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0056] Referring now to the figures of the drawings in detail and first, particularly, to FIG. 1 thereof, there is seen a first exemplary embodiment of a clamping apparatus 1 according to the invention. The clamping apparatus 1 has a spindle body 3 and a nut element 5 which can be screwed to the spindle body 3 or can be brought into threaded engagement with the spindle body 3. In this case, the clamping apparatus 1 is configured as a connecting apparatus, through the use of which a plurality of components can be connected by way of a screw connection. In order to clarify a connection of this type, FIG. 2 uses dashed lines to indicate by way of example two components 7, 9 which are connected by the clamping apparatus 1. Each component 7, 9 has a continuous recess or bore through which the spindle body 3 having a substantially cylindrical shank or spindle region 10 is guided. In addition, the components are clamped-in between the nut element 5 and a screw head 57 of the spindle body 3, which screw head 57 is connected to the shank 10.

[0057] As shown, furthermore, in FIG. 2, the nut element 5 has a sleeve-shaped receiving body or base body 11, by way of which the nut element 5 can be pushed or screwed onto the shank 10. In the pushed-on state of the nut element 5, the sleeve-shaped receiving body 11 engages around the shank 10 in an annular manner. The sleeve-shaped receiving body 11 has a drive profile 13 (FIG. 1) for the rotational actuation of the nut element 5. In this case, the drive profile 13 is formed by way of example by way of an external hex.

[0058] According to FIGS. 2 and 3, in addition, the nut element 5 has a plurality of (in this case, by way of example, eight) cylindrical roller bodies 14. In this case, according to FIG. 6, each roller body 14 has cylindrical bearing journals 17 which protrude on the end side or from the end walls 15 and through the use of which the roller bodies 14 are mounted in annular bearing cages 19, 20 of the nut element 5 in such a way that they can be rotated axially. In this case, by way of example, four roller bodies 14 are mounted in each bearing cage 19, 20 in such a way that they can be rotated axially. The roller bodies 14 which are mounted on the respective bearing cage 19, 20 are disposed on the nut element 5 in such a way that they are distributed homogeneously in the circumferential direction U. Each annular bearing cage 19 is disposed in such a way that its contour is adapted in a recess 21, 22 (FIG. 2) of the sleeve-shaped receiving body 11, which recess 21, 22 runs in the circumferential direction U on the inner side. In this case, each bearing cage 19, 20 is secured in the respective recess 21, 22 by way of elongate undercut webs 23 which protrude laterally to the outside, in such a way that the respective bearing cage 19, 20 can be rotated relative to the sleeve-shaped receiving body 11 in the circumferential direction U. In this case, in addition, the bearing cages 19, 20 are spaced apart from one another at a defined axial spacing.

[0059] In this case, furthermore, each annular bearing cage 19, 20 is of multiple-piece configuration with a plurality of (in this case, by way of example, four) ring segment elements 25 of rectangular cross section (FIG. 5). In this case, by way of example, each ring segment element 25 is assigned a single roller body 14. In this case, each roller body 14 is disposed in such a way that its contour is adapted in a continuous recess 27 on the middle (as viewed in the circumferential direction U) region 29 of the respective ring segment element 25. In addition, each ring segment element 25 has journal trunnions 31, 33 on the middle region 29, in which bearing trunnions 31, 33 the bearing journals 17 of the roller bodies 14 are received. In this case, the journal trunnion 31 of the respective ring segment element 25 is formed by way of a closed bore, whereas the journal trunnion 33 of the respective ring segment element 25 is formed by way of a slot which is open toward the outside. In this case, during the assembly of the nut element 5, the roller bodies 14 are first of all guided with one of the bearing journals 17 into the bore 31 and subsequently are guided with the other one of the bearing journals 17 into the slot 33. In this case, furthermore, the undercut webs 23 which protrude laterally to the outside are also configured on each ring segment element 25.

[0060] According to FIG. 6, in addition, each roller body 14 has a defined roller engagement structure 35. In this case, the roller engagement structure 35 of each roller body 14 is formed by way of a plurality of grooves which are spaced apart from one another in the roller axial direction and by way of which annular webs 37 which extend around the respective roller body 14 in the circumferential direction are configured. In this case, in addition, the longitudinal axis of the roller bodies 14 is disposed parallel to the longitudinal axis of the nut element 5. As an alternative, however, the longitudinal axis of the roller bodies 14 might also be oriented at a defined setting angle with respect to the longitudinal axis of the nut element 5.

[0061] The roller bodies 14 are in engagement by way of their roller engagement structure 35 with receiving body engagement structures 39, 40 (FIG. 2) of the receiving body 11, which receiving body engagement structures 39, 40 are configured on wall regions 41, 42 of the receiving body 11 which delimit the circumferential recesses 21, 22 on the bottom side. Each receiving body engagement structure 39, 40 of the receiving body 11 is formed by way of a plurality of grooves which are spaced apart from one another in the axial direction x and by way of which annular webs 43 which extend around the receiving body 11 in the circumferential direction U are configured. In this case, the receiving body engagement structures 39, 40 form a guide for the roller bodies 14 in the circumferential direction U.

[0062] Furthermore, the shank 10 of the spindle body 3 has a plurality of (in this case, by way of example, four) engagement regions 45 (FIGS. 1, 4) which are distributed homogeneously in the circumferential direction U and are spaced apart from one another, with in each case one spindle body engagement structure 47 which corresponds to the roller engagement structure 35. Through the use of the roller engagement structures 35 of the roller bodies 14 and the spindle body engagement structures 47 of the spindle body 3, the nut element 5 can be screwed to the spindle body 3 or can be brought into threaded engagement with the latter. In the screwed state of the spindle body 3 and the nut element 5, each roller body 14 is in engagement by way of its roller engagement structure 35 with the spindle body engagement structure 47 of an engagement region 45.

[0063] In this case, the spindle body engagement structure 47 of each engagement region 45 is formed by way of a plurality of circumferential grooves which are spaced apart from one another and by way of which webs 49 which run around the spindle body 3 on the outer side are configured. In this case, the spindle body webs 49 of each engagement region 45 run parallel to one another. In addition, the grooves of each spindle body engagement region 45 configure a spindle body thread. In this case, as viewed in the circumferential direction U, each spindle body thread 47 extends from a starting region 51 as far as an end region 53, the thread pitch of each spindle body thread 45 being constant starting from the starting region 51 toward the end region 53. As an alternative, however, it might also be provided that the thread pitch of each spindle body thread 45 changes, in particular decreases, starting from the starting region 51 toward the end region 53. In this case, in addition, the spindle body engagement structures 47 extend over an axial length of the spindle body 3, which axial length is multiple times greater than the axial length of the roller bodies 14.

[0064] In this case, furthermore, each spindle body engagement region 45 is assigned a receiving slot 55 of the spindle body 3, which receiving slot 55 runs in the axial direction x, adjoins the respective spindle body engagement region 45 in the circumferential direction U, and the contour of which is adapted by way of example in this case to the roller bodies 14. Through the use of the receiving slots 55, the nut element 5 can be placed onto the screw section 44 and can be removed from the screw section 44. In order to place the nut element 5 onto the screw section 44, a roller body 14 is introduced into each receiving slot 55 partially or with a region which protrudes from the receiving body 11 to the inside. The roller bodies 14 which are introduced into the receiving slots 55 are not in engagement by way of their engagement structures 35 with the engagement structures 47 of the screw section 44, with the result that the nut element 5 can be moved relative to the spindle body 3 in the axial direction x. In this case, the receiving slots 55 extend in the axial direction x over the entire axial length of the spindle body engagement structures 47.

[0065] In order to screw the nut element 5 to the spindle body 3, the nut element 5 which is placed onto the screw section 44 is actuated rotationally in a first rotational direction relative to the spindle body 3. In this case, starting from the respective receiving slot 55, the roller bodies 14 are introduced into the spindle body engagement region 45 or starting region 51 of the spindle body engagement structure 47 which adjoins the respective receiving slot 55 in the circumferential direction U. In the case of a further rotational actuation of the nut element 5, the nut element 5 is moved in the spindle axial direction x toward the screw head 57 of the spindle body by the engagement structures 35, 47 which are situated in engagement with one another. In this way, components which are disposed between the screw head 57 and the nut element 5 can be clamped-in and therefore connected.

[0066] In order to release the screw connection of the nut element 5 and the spindle body 3, the nut element 5 is rotationally actuated in a second rotational direction which is opposed to the first rotational direction. In this case, the nut element 5 is moved in the spindle axial direction x away from the screw head 57 of the spindle body by the engagement structures 35, 47 which are situated in engagement with one another. In addition, starting from the respective spindle body engagement region 45, the roller bodies 14 are introduced into the adjoining receiving slots 55. In a defined rotational position of the nut element 5, the roller bodies 14 are then disposed in the receiving slots 55, with the result that the engagement structures 47, 35 of the spindle body 3 and of the roller bodies 14 are out of engagement, and the nut element 5 can be displaced in the axial direction relative to the spindle body 3. In that rotational position of the nut element 5, the nut element 5 can also be removed from the spindle body 3.

[0067] In this case, furthermore, the spindle body 3 also has end stops 59 (FIG. 4), with which the nut element 5 comes into contact in the case of a screw connection to the spindle body 3. In this case, the end stops 59 are formed by way of example by way of the wall regions of the spindle body 3 which delimit the spindle body engagement structures 47 in the circumferential direction U. In the case of a rotational actuation of the nut element 5 in the first rotational direction, the roller bodies 14 come into contact with the wall regions which are disposed on the end regions 53 of the engagement structures 47.

[0068] On an end side which faces the screw head 57, the nut element 5 can optionally also have an axial bearing, for example an axial cylindrical roller bearing, by way of which the nut element 5 comes into contact with a component in the case of clamping-in of components. In this way, the frictional forces which act between the component and the nut element 5 in the case of screwing-on of the nut element 5 can be reduced effectively.

[0069] FIG. 7 shows a second exemplary embodiment of a clamping apparatus according to the invention. This clamping apparatus has a spindle body 61. In comparison with the spindle body 3, the spindle body 61 does not have any end stops 59. In this case, instead, each spindle body engagement structure 47 adjoins, by way of its end region 53, the receiving slot 55 which follows in the circumferential direction U. In this case, therefore, the roller bodies 14 can also be introduced into the receiving slot 55 which follows in the circumferential direction U in the case of a rotational actuation of the nut element 5 in the first rotational direction, starting from the respective spindle body engagement structure 47.

[0070] FIGS. 8 to 13 show a third exemplary embodiment of a clamping apparatus 63 according to the invention. This clamping apparatus 63 has a nut element 65. In comparison with the nut element 5 of the clamping apparatus 1, the nut element 65 has a smaller axial length. In addition, the nut element 65 does not have two bearing cages, but rather a single bearing cage 67, in which a plurality of (in this case, by way of example, four) roller bodies 69 are mounted in such a way that they can be rotated axially. In addition, the roller bodies 69 have a greater axial length than the roller bodies 14.

[0071] Furthermore, the clamping apparatus 63 also has a spindle body 71. According to FIG. 10, a substantially cylindrical shank 73 of the spindle body 71 has a first spindle section 75, on which the plurality of spindle body engagement regions 45 are configured. In this case, the first spindle section 75 configures a free end of the shank 73. In this case, in addition, the spindle body engagement regions 45 have a considerably smaller axial length than in the case of the clamping apparatus 1.

[0072] Furthermore, the shank 73 of the spindle body 71 also has a second spindle section 77 which adjoins the first spindle section 75 and on which an engagement structure 79 which can be brought into engagement with the roller engagement structure 35 of the roller bodies 14 and runs completely around the spindle body 71 on the outer side is configured. The spindle section 77 is disposed in the axial direction x between the first spindle section 75 and the screw head 57 of the spindle body 71. In this case, in addition, the engagement structure 79 of the second spindle section 77 is formed by way of a thread with a circumferential thread groove, a web 81 which runs helically around the spindle body 71 on the outer side being configured by way of the thread groove.

[0073] According to FIGS. 10 to 12, in addition, the spindle body 71 does not have any receiving slots 55. Instead, each spindle body engagement region 45 of the spindle body 71 is assigned a cylindrical recess 83 which adjoins the respective spindle body engagement region 45 in the circumferential direction U. In this case, the cylindrical recesses 83 run in the axial direction x. A substantially cylindrical rotational pin 85 is secured in each recess 83 in such a way that it can be rotated axially, each rotational pin 85 being engaged around by the material of the shank 73 over more than half of its circumference. In this case, on the end side, each rotational pin 85 additionally has a drive profile 86 for the rotational actuation of the rotational pin 85. In this case, by way of example, the drive profile is formed by way of a hexagon socket.

[0074] Each rotational pin 85 has a circumferential section 87 (FIG. 13) with a rotational pin engagement structure which corresponds to the spindle body engagement structures 47. In that rotational position of the rotational pins 85 relative to the shank 73 which is shown in FIG. 11, the circumferential section 87 is exposed toward the outside. In this case, together with the spindle body engagement structures 47, the rotational pin engagement structures 87 configure an engagement structure in the form of a multiple start thread, which engagement structure runs around the spindle body 71 completely or only with small interruptions on the outer side.

[0075] According to FIG. 10, in addition, each rotational pin 85 has a circumferential section 89 with a flattened portion. In a rotational position of the rotational pins 85 which is shown in FIG. 10, the circumferential section 89 is exposed toward the outside. In that rotational position of the rotational pins 85, the nut element 65 can be disposed in a defined rotational position, in which the roller bodies 69 are disposed partially in the spindle body recesses 83. In this case, the engagement structures 35, 47 of the spindle body 71 and of the roller bodies 69 are then out of engagement. In this case, in addition, the roller bodies 69 then also do not engage by way of their engagement structures 35 into the rotational pins 85. In this case, therefore, the nut element 65 can be displaced relative to the spindle body 71 in the axial direction x, in particular can also be removed from the spindle body 71 and can be placed onto the spindle body 71. As an alternative to the flattened portion 89, the respective rotational pin 85 can also have a (in particular, cylindrical) recess.

[0076] FIGS. 14 and 15 show a fourth exemplary embodiment of a clamping apparatus according to the invention. This clamping apparatus has a spindle body 91. In comparison with the spindle body 71, the spindle body 91 has rotational pins 93. Each rotational pin 93 has a spur gear 95 at a free end for a rotational drive. The spur gears 95 are in tooth engagement with a centrally disposed spur gear 97 of the spindle body 71, which spur gear 97 is secured on the shank 73 in such a way that it can be rotated axially. The spur gear 97 has a drive profile 99 on a central region for a rotational drive. In this case, by way of example, the drive profile 99 is likewise formed by way of a hexagon socket.

[0077] FIG. 16 shows a vise 101 with a fifth exemplary embodiment of a clamping apparatus according to the invention. The vise 101 has a spindle body 103 and a nut element 105 which can be screwed to the spindle body 103 and is indicated using dashed lines. The fundamental construction of the spindle body 103 corresponds to the construction of the spindle body 3, the spindle body 103 not having a screw head, however, in particular. The fundamental construction of the nut element 105 likewise corresponds to the construction of the nut element 5.

[0078] In this case, the spindle body 103 is secured on a first clamping jaw element 107 of the vise 101 with a first clamping jaw 109 in such a way that it can be rotated axially. In addition, the nut element 105 is secured fixedly on a second clamping jaw element 111 of the vise 101 with a second clamping jaw 112 so as to rotate with it.

[0079] In this case, the first clamping jaw 109 can be moved toward the second clamping jaw 112 by way of rotational actuation of the spindle body 103 in a first rotational direction relative to the nut element 105 by the engagement structures of the spindle body 103 and of the roller bodies of the nut element 105 which are situated in engagement with one another. In this way, a workpiece which is disposed between the clamping jaws 109, 112 can be clamped-in.

[0080] By way of rotational actuation of the spindle body 103 in a second rotational direction opposed to the first rotational direction relative to the nut element 105, the first clamping jaw 109 is movable away from the second clamping jaw 112 by the engagement structures of the spindle body 103 and the roller bodies of the nut element 105 situated in engagement with one another.

LIST OF REFERENCE NUMERALS

[0081]

TABLE-US-00001 1 Clamping apparatus 35 Roller engagement structure 3 Spindle body 37 Web 5 Nut element 39 Receiving body engagement structure 7 Component 41 Wall region 9 Component 42 Wall region 10 Shank 43 Web 11 Receiving body 45 Engagement region 13 Drive profile 47 Spindle body engagement structure 14 Roller body 49 Web 15 End wall 51 Starting region 17 Bearing journal 53 End region 19 Bearing cage 55 Receiving slot 20 Bearing cage 57 Screw head 21 Recess 59 End stop 23 Undercut web 61 Spindle body 25 Ring segment element 63 Clamping apparatus 27 Recess 65 Nut element 29 Middle region 67 Bearing cage 31 Journal trunnion 69 Roller body 33 Journal trunnion 71 Spindle body 73 Shank 112 Clamping jaw 75 Spindle section 22 Recess 77 Spindle section 79 Engagement structure 81 Web 83 Recess 85 Rotational pin 86 Drive profile 87 Circumferential section 89 Circumferential section 91 Spindle body 93 Rotational pin 95 Spur gear 97 Spur gear 99 Drive profile 101 Vise 103 Spindle body 105 Nut element 107 Clamping jaw element 109 Clamping jaw 111 Clamping jaw element