CLAMPING DEVICE FOR A TOOL OR WORKPIECE, DRAW-IN COLLET AND COUPLING ELEMENT FOR THE CLAMPING DEVICE, AND METHOD FOR PREPARING THE CLAMPING DEVICE

Abstract

A clamping device for a tool or workpiece has a draw-in collet and a coupling element. The clamping device has first and second bayonet closures with which the draw-in collet can be locked and braced against the coupling element. The first and second bayonet closures are brought into engagement at the same time, as a result of which the draw-in collet is locked against the coupling element using the first bayonet closure, and the draw-in collet is braced against the coupling element using the second bayonet closure. First, the draw-in collet is pushed into the coupling element with partial actuation of the bayonet closures. Then the draw-in collet is rotated relative to the coupling element with a further partial actuation of the bayonet closures, and finally the draw-in collet is withdrawn to thereby lock the first bayonet closure and to brace the second bayonet closure.

Claims

1. A clamping device for a tool or workpiece, the clamping device comprising: a draw-in collet and a coupling element; a first bayonet closure and a second bayonet closure for locking and bracing said draw-in collet against said coupling element; said first and second bayonet closures being configured to be brought into engagement at the same time, with said draw-in collet being locked against said coupling element by way of said first bayonet closure, and said draw-in collet being braced against said coupling element by way of said second bayonet closure.

2. The clamping device according to claim 1, wherein said coupling element is a tension sleeve, a tension sleeve secured to a tension rod, formed in one piece with a tension rod, or is a tension rod.

3. The clamping device according to claim 1, further comprising a clamping system, being a hydraulically actuated, pneumatically actuated, or electromechanically actuated clamping system, configured to continuously adjust a force and configured to axially displace said draw-in collet via said coupling element and/or via a tension rod to be screwed to said coupling element.

4. The clamping device according to claim 1, which comprises a main body formed with an inner cone in which said draw-in collet, having an outer cone, is received, and said main body having a concentricity adjusting device.

5. The clamping device according to claim 4, wherein a cone angle of said inner cone and said outer cone lies between 2° and 3°.

6. The clamping device according to claim 4, wherein said draw-in collet is formed with slots and spreading elements, which spread open said draw-in collet when said draw-in collet is detached, from a non-spread state, by a maximum radial widening distance of approximately 0.1 mm.

7. The clamping device according to claim 6, wherein the cone angle of said outer cone of said collet in the non-spread state corresponds to the cone angle of the inner cone of said main body, and/or a contour of said outer cone of said draw-in collet lies on an imaginary right circular cone.

8. The clamping device according to claim 6, wherein said spreading elements are elastomer fillings in said slots and/or in bores through which said slots pass.

9. The clamping device according to claim 1, wherein said second bayonet closure has mutually clampable, coupling-element-side and draw-in-collet-side clamping shoulders that are distributed evenly over a circumference of said coupling element and multiple clamping shoulders distributed evenly over a circumference of said draw-in collet.

10. The clamping device according to claim 9, wherein clamping surfaces to be placed against one another of mutually braceable clamping shoulders of said second bayonet closure lie in a plane perpendicularly to a center axis of said clamping device, with said clamping surfaces to be placed against one another of the mutually braceable clamping shoulders of said second bayonet closure being formed and located on said second bayonet closure such that, when said first bayonet closure is in a locked position, said clamping surfaces to be placed against one another substantially completely overlap.

11. The clamping device according to claim 1, further comprising a clamping mechanism, being a spring-loadable or spring-loaded pressing ring, configured to act on said draw-in collet.

12. The clamping device according to claim 1, wherein a force flow of a clamping force, which axially draws in the draw-in collet, is guided over a flexurally elastic region formed on another side of a receiving region for the tool or the workpiece of the draw-in collet downstream of said second bayonet closure, but in close vicinity of said second bayonet closure.

13. The clamping device according to claim 12, wherein said flexurally elastic region comprises a bellows and/or said flexurally elastic region is formed in a tension rod.

14. A draw-in collet for a clamping device for a tool or workpiece, the clamping device having a draw-in collet and a coupling element, the draw-in collet comprising: a draw-in-collet-side bayonet closure element of a first bayonet closure and a draw-in-collet-side bayonet closure element of a second bayonet closure; said draw-in-collet-side bayonet closure element of the first bayonet closure being a locking stop and said draw-in-collet-side bayonet closure element of the second bayonet closure being a draw-in-collet-side, force-transferring clamping shoulder to be braced against a coupling-element-side, force-transferring clamping shoulder of the coupling element.

15. The draw-in collet according to claim 14, which comprises spreading elements and slots, said spreading elements spreading open the draw-in collet when the draw-in collet is detached, from a non-spread state, by a maximum radial widening distance of approximately 0.1 mm.

16. The draw-in collet according to claim 15, wherein said spreading elements are elastomer fillings in said slots and/or in bores through which said slots pass.

17. The draw-in collet according to claim 14, wherein the second bayonet closure is formed, on the draw-in-collet side, a plurality of draw-in-collet-side, force-transferring clamping shoulders that are evenly distributed over a circumference and formed to be braced against coupling-element-side, force-transferring clamping shoulders, or clamping surfaces of said clamping shoulders lying in a plane perpendicularly with respect to a center axis of the draw-in collet.

18. The draw-in collet according to claim 14, formed with at least one longitudinal groove forming a common draw-in-collet-side bayonet closure element of the first bayonet closure and the second bayonet closure.

19. The draw-in collet according to claim 14, wherein said locking stop is an end stop of a transverse groove, the transverse groove having an undercut.

20. The draw-in collet according to claim 14, which comprises an outer cone to be received in an inner cone of a main body of the draw-in collet.

21. The draw-in collet according to claim 20, wherein said outer cone has a cone angle between 2° and 3°.

22. The draw-in collet according to claim 14, formed with a cylindrical receiving opening for receiving a tool or workpiece to be clamped, the tool or workpiece being cylindrical or having a cylindrical shank.

23. The draw-in collet according to claim 14, wherein said draw-in-collet-side bayonet closure elements of at least one of said first bayonet closure or said second bayonet closure are located on an internal circumferential surface of the draw-in collet or on an external circumferential surface of the draw-in collet.

24. A coupling element for a clamping device for a tool or workpiece, the clamping device having a draw-in collet and a coupling element, the coupling element comprising: a coupling-element-side bayonet closure element of a first bayonet closure and a coupling-element-side bayonet closure element of a second bayonet closure; said coupling-element-side bayonet closure element of the first bayonet closure being a locking element and said coupling-element-side bayonet closure element of the second bayonet closure being a coupling-element-side, force-transferring clamping shoulder to be braced against a draw-in-collet-side, force-transferring clamping shoulder of the draw-in collet.

25. The coupling element according to claim 24, wherein: the coupling element is a tension sleeve to be secured to a tension rod or formed in one piece with a tension rod, the tension sleeve having the coupling-element-side bayonet closure elements of at least one of the first bayonet closure or the second bayonet closure located on an inside of the tension sleeve; or the coupling element is a tension rod with the coupling-element-side bayonet closure elements of at least one of the first bayonet closure or the second bayonet closure located on an outside of the tension rod.

26. The coupling element according to claim 24, wherein the second bayonet closure is formed with a plurality of coupling-element-side, force-transferring clamping shoulders that are evenly distributed over a circumference and configured to be braced against draw-in-collet-side, force-transferring clamping shoulders, and/or clamping surfaces of the clamping shoulder lie in a plane perpendicularly with respect to a center axis of the coupling element.

27. The coupling element according to claim 24, wherein the first bayonet closure, on the coupling-element side, has multiple locking elements distributed evenly over a circumference.

28. The coupling element according to claim 24, wherein said locking element is a latching pin.

29. A method for preparing a clamping device for a tool or workpiece, the method which comprises: providing the clamping device according to claim 1 with a draw-in collet and a coupling element; axially displacing the draw-in collet relative to said coupling element by applying an external force counter to an internal force, by pushing the draw-in collet into the coupling element with an external force being external to the draw-in collet, and at the same time partially actuating the first bayonet closure and the second bayonet closure; subsequently rotating the draw-in collet, with an external force, relative to the coupling element into a predefined position at a stop in the first bayonet closure, wherein the first bayonet closure and the second bayonet closure are still partially actuated; and subsequently withdrawing the draw-in collet with an external force to thereby lock the first bayonet closure and to brace the second bayonet closure.

30. The method according to claim 29, which comprises rotating the draw-in collet by approximately 60° relative to the coupling element.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0084] FIG. 1A is a longitudinal section, taken along the line E-E in FIG. 1B, through an exemplary embodiment according to the invention of a clamping device for a tool or workpiece, having a draw-in collet and a coupling element;

[0085] FIG. 1B is an end view of the clamping device;

[0086] FIG. 2 is a detail view of a longitudinal section of a further exemplary embodiment of the invention with the clamping device for a tool or workpiece, having a draw-in collet and a coupling element; and

[0087] FIG. 3A is a sectional view of an exemplary draw-in collet according to the invention, taken along the line CC in FIG. 3C;

[0088] FIG. 3B is a further sectional view;

[0089] FIG. 3C is a detail view of a longitudinal section through the draw-in collet; and

[0090] FIG. 3D is a perspective view thereto.

DETAILED DESCRIPTION OF THE INVENTION

[0091] Referring now to the figures of the drawing, which illustrate a (precision) clamping device with a draw-in collet and a coupling element with double bayonet, for tools or workpieces. FIGS. 1A and 1B a clamping device 2 for clamping a tool (or a workpiece). FIG. 2 shows a view of a detail of this clamping device 2, which in particular shows a draw-in collet 4 and a coupling element 6 of the clamping device 2 in more detail. The draw-in collet 4 is then also shown in the several views of FIG. 3, i.e., FIGS. 3A, 3B, 3C, and 3D.

[0092] The clamping device 2—a drawing-in clamping system—provides, as depicted in FIG. 1, a substantially sleeve-shaped draw-in collet 4 (cf. FIG. 3) with a cylindrical inner casing 84 and a substantially conical outer casing 16—in short also referred to as outer cone 16 —, which is or has been inserted with its tapered end at the front into a likewise conical receiving opening/bore 14—in short also referred to as inner cone 14 —, which is central with respect to the axis of rotation/center axis 70, of a main body 10 of the clamping device (cf. also FIG. 2).

[0093] A tool, or a cylindrical shank of the tool, is clamped (this is not shown) in the cylindrical inner casing (receiving opening) 84 of the draw-in collet 4.

[0094] As FIG. 2 in particular also shows, to the draw-in collet 4 there is connected a coupling element 6—in the form of a (sleeve-shaped) tension sleeve 8—which itself in turn is connected, here screwed, to a tension rod 32, on which a clamping/drawing-in system (12) (which is not shown in more detail, and is for example hydraulic) for clamping the clamping device or for gripping the tool (in the receiving opening) acts. For this purpose, at the end facing away from the tool side, the tension rod 32 provides a bore which has an internal thread and via which the clamping/drawing-in system (12) can be screwed to the tension rod 32.

[0095] The draw-in collet 4, coupling element 6 or tension sleeve 8, and the tension rod 32 are located in the main body 10, as shown in FIG. 1.

[0096] A illustrated by FIG. 2, the connection between the draw-in collet 4 and the coupling element 6 or the tension sleeve 8 is critical. The connection is realized by means of two bayonet closures 50, 52 (in short also referred to just as bayonet)—which are described in more detail below.

[0097] Bayonet closure elements (described in more detail below) of the two bayonets (50, 52) or of the first bayonet 50 and the second bayonet 52 are thus on the draw-in collet 4 (here on the outside 48, or on the outer circumference 48) and the coupling element 6 or the tension sleeve 8 (here on the inside 46, or on the inner circumference 46).

[0098] The connection between draw-in collet 4 and coupling element 6 is locked using the first bayonet 50; the connection between draw-in collet 4 and coupling element 6 is braced using the second bayonet 52.

[0099] Draw-In Collet

[0100] As FIG. 3 shows, a multiplicity (here six) of circumferentially evenly distributed axial slots 20, which radially 86 penetrate the draw-in collet 4, divides the draw-in collet 4 into a multiplicity (here correspondingly six) of tongues 88. The slots 20 are closed only at one of their longitudinal ends and are open —toward the end face/edge 90, that faces the tool, of the draw-in collet 4—at their other longitudinal end, as a result of which the draw-in collet 4 can be spread open.

[0101] As in particular FIG. 3 also shows, the draw-in collet 4 further also provides a multiplicity of (which here corresponds to the number of slots 20) (thus, here correspondingly also six) circumferentially evenly distributed axial 80 (blind) bores 24, which—like the slots 20—also are closed only at one longitudinal end and are open—toward the end face/edge 90, that faces the tool, of the draw-in collet 4—at their other longitudinal end.

[0102] The bores 24 are located in the draw-in collet 4 such that the slots 20 pass through them.

[0103] The cone angle 18 of the outer cone 16 of the draw-in collet 4, in the non-spread state, corresponds to the cone angle 18 of the inner cone 14 of the main body 10—and allows for approximately 2°30′ here.

[0104] If thus—when the tool is being clamped—the outer cone 16 of the—slotted-draw-in collet 4 is drawn into the inner cone 14 of the main body 10 by means of the clamping/drawing-in system (12), the tool, which is inserted with its cylindrical shank in the draw-in collet 4, or received with its cylindrical shank in the cylindrical inner casing 84 of the draw-in collet 4, is radially 86 clamped/gripped in the process. In this respect, the diameter of the receiving opening 84 of the draw-in collet 4 is dimensioned such that, in the clamped state, it corresponds to the outer diameter of the tool/workpiece that is clamped in place and/or the outer casing 16 of the draw-in collet 4 is in surface contact with the inner cone 14 of the main body 10.

[0105] The axial 80 extent of the bores 24 is, as FIG. 3 shows, shorter than that of the slots 20, here for example approximately one quarter of the slot length.

[0106] The bores 24 are filled with an elastomer 22—starting from the bore base, not quite as far as the end face/edge 90 of the draw-in collet 4—in such a way that the draw-in collet 4—on account of the slots 20 passing through the bores 24—is widened. That is to say, in cross section more elastomer 22 is filled in the bores 24 than the bore diameter can accommodate in the non-spread state.

[0107] In descriptive terms,—as a result of the elastomer 22 —, spreading elements 22 are thus formed on the draw-in collet 4 in the bores 24 or by way of the bores 24 filled with elastomer 22, which spreading elements spread open the draw-in collet 4, when it is detached, from the non-spread state (here by way of example) by a maximum radial 86 widening distance 38 of approximately 0.1 mm.

[0108] That is to say, the spreading elements 22 ensure that the draw-in collet 4, manufactured in the nominal diameter of the tool/workpiece to be clamped in place, in the detached state is widened by approximately 0.1 mm —, with the result that a more secure automatic changeover of parts is ensured.

[0109] The bores 24 filled with elastomer 22 thus also ensure protection against soiling, and they also—if they are not filled up to the end face/edge 90 —form lugs for an assembly spanner (insertion aid—not shown) for assembling/exchanging/inserting the draw-in collet 4.

[0110] As FIG. 3 in particular shows, the bayonet closure elements of the first and the second bayonet 50, 52 are located at that end of the draw-in collet 4 that is opposite the receiving opening 84 or receiving region 40 for the tool —specifically on the outer circumference 48 there.

[0111] As depicted in FIGS. 2 and 3, complementary coupling-element-side or tension-sleeve-side bayonet closure elements of the first and the second bayonet 50, 52 are located on the inner circumference 46 of the coupling element 6 or of the tension sleeve 8, with the result that they can be brought into engagement when the draw-in collet 4 is pushed into the (sleeve-shaped) coupling element 6 or tension sleeve 8—and the first bayonet 50 and the second bayonet 52 can be closed as a result.

[0112] Primarily important draw-in-collet-side bayonet closure elements of the first bayonet closure 50 are, as shown in FIG. 3,—in this case—three circumferentially evenly distributed—locking stops 56, in the form of three transverse grooves 62, each of which is closed at its one end, has an undercut 64, and forms a stop.

[0113] Also provided as draw-in-collet-side bayonet closure elements of the first bayonet 50 are three longitudinal grooves 66 (correspondingly belonging to the three transverse grooves 62), which are evenly distributed over the outer circumference 48 of the draw-in collet 4,—are attached to the respective transverse groove 62 —, and start on that end face 90 of the draw-in collet 4 that faces away from the tool side.

[0114] These three longitudinal grooves 66—in the form of draw-in-collet-side bayonet closure elements of the first bayonet 50—also at the same time form draw-in-collet-side bayonet closure elements of the second bayonet 52.

[0115] Further draw-in-collet-side bayonet closure elements of the second bayonet closure 52, which—in a similar way to the transverse grooves 62 —“adjoin” the longitudinal grooves 66, are three “transverse grooves” respectively forming clamping shoulders 60—with corresponding clamping surfaces 68.

[0116] If, as is also shown in FIG. 3, these three transverse grooves are each open at their groove ends, the three transverse grooves form a peripheral annular groove 92 on the outer side 48 of the draw-in collet 4.

[0117] In this respect, the—circumferential—extent of the “common” longitudinal grooves 66 (of the first bayonet 50 and the second bayonet 52) is in each case slightly larger than clamping shoulders 58 on the coupling element 6 or on the tension sleeve 8, with the result that the clamping shoulders 58 of the coupling element 6 or of the tension sleeve 8 can be pushed into or through the longitudinal grooves 66 on the draw-in collet 4.

[0118] The clamping surfaces 68 of the clamping shoulders 60 of the draw-in collet 4 (as is also the case for the clamping surfaces/shoulders 68/58 of the coupling element 6 or the tension sleeve 8) lie in a plane perpendicularly in relation to a center axis 70 of the draw-in collet 4 (and the same goes for the center axis 70 of the coupling element 6 or the clamping device 2). As shown in particular in FIG. 2, such—draw-in-collet-side and coupling-element-side —clamping surfaces 68 or clamping shoulders 58/60 are braced in pairs, as will be described in more detail below.

[0119] Coupling Element

[0120] The complementary “mating elements,” which correspond to the draw-in-collet-side bayonet closure elements of the first bayonet 50 and the second bayonet 52, of the coupling element 6 or of the tension sleeve 8 are on the inner circumference 46 of the coupling element 6 or of the tension sleeve 8, as can be seen in FIGS. 1 and 2.

[0121] Here, FIGS. 1 and 2 depict that these “mating elements”, which correspond to the draw-in-collet-side bayonet closure elements of the first bayonet 50 and the second bayonet 52, are located on the tool-side end, on the inside 46 of the coupling element 6 or of the tension sleeve 8.

[0122] Essential coupling-element-side bayonet closure elements of the first bayonet 50 are three radially 86 inwardly protruding locking pins 54, which are distributed evenly over the inner circumference of the coupling element 6 or of the tension sleeve 8.

[0123] Three clamping shoulders 58—with corresponding clamping surfaces 68—in the form of coupling-element-side bayonet closure elements of the second bayonet closure 52 are located on the inner circumference 46 of the coupling element 6 or of the tension sleeve 8.

[0124] It is also the case that these clamping surfaces 68 on the clamping shoulders 58 of the coupling element 6 or of the tension sleeve 8 lie in a plane perpendicularly in relation to a center axis 70 of the coupling element 6 (and the same goes for the center axis 70 of the draw-in collet 4 or the clamping device 2).

[0125] While the coupling-element-side clamping surfaces 68 of the second bayonet 52 are located/formed on the respective clamping shoulder 58 so as to face away from the tool side, the complementary draw-in-collet-side clamping surfaces 68 of respective clamping shoulders 60 there are located on the respective clamping shoulder 60 so as to be on the tool side —, as a result of which the clamping shoulders 60/58 of draw-in collet 4 and coupling element 6 or tension sleeve 8—in each case can be braced in pairs over their respective clamping surfaces 68.

[0126] In this respect, the—circumferential—extent of the coupling-element-side clamping shoulders 58 is the same as that of the draw-in-collet-side clamping shoulders 60 (the same correspondingly also applies to the clamping surfaces 68), with the result that—mutually braceable—clamping shoulders 60/58 of draw-in collet 4 and coupling element 6 or tension sleeve 8 or their clamping surfaces 68—when the second bayonet 52 is closed—can completely overlap.

[0127] As also depicted in FIGS. 1 and 2, an internal thread 94, by means of which the coupling element 6 or the tension sleeve 8 can be screwed to the tension rod 32, is introduced at that end of the coupling element 6 or of the tension sleeve 8 that faces away from the tool side, likewise on the inside 46 of the coupling element 6 or of the tension sleeve 8.

[0128] To that end, as FIG. 2 in particular shows, a corresponding external thread 96 is applied to the outer circumference 48 of the tool-side end of the draw-in collet 4.

[0129] Clamping Mechanism for Bracing the Second Bayonet

[0130] The second bayonet 52 can be or is braced by means of a clamping mechanism 72—introduced between tension rod 32 and coupling element 6.

[0131] To that end, the tension rod 32, as FIG. 2 in particular shows,—at its tool-side end—provides a receiving opening 98, into which a (tension) spring 26 can be or is placed.

[0132] Within this receiving opening 98, the spring 26 is supported on a peripheral shoulder 100 in the receiving opening 98 of the tension rod 32. In the untensioned state, the spring 26—if it is placed in the receiving opening 98 and supported there against the shoulder 100—protrudes axially 80 beyond the tension rod 32 by approximately half of its (axial) length.

[0133] On the tool side of the spring 26 there is placed a pressing ring 28, which—if the coupling element 6 or tension sleeve 8 is screwed to the tension rod 32—dips into the through-opening 102 of the coupling element 6 or of the tension sleeve 8.

[0134] The pressing ring 28 can be supported on radial locking bolts 54 (cf. above in relation to the coupling element 6 or below in relation to the first bayonet 50) located on the inside 46 of the coupling element 6 (here, the draw-in collet has not yet been pushed into the coupling element 6 or tension sleeve 8), with the result that—if the coupling element 6 or tension sleeve 8 is screwed to the tension rod 32—the spring 26 is compressed and pretensioned.

[0135] The spring 26—via its pressing ring 28—can be further axially 80 tensioned by the through-opening 102 of the sleeve-shaped coupling element 6 or of the tension sleeve 8, as is the case when the bayonets 50, 52 are being closed or when the second bayonet 52 is being braced.

[0136] In this instance,—when the draw-in collet 4 is pushed into the coupling element 6,—that end face of the draw-in collet 4 that faces away from the tool side then presses onto the pressing ring 28—and displaces it, counter to the spring force, (further) axially 80 (, as a result of which the pressing ring 28 detaches from the locking pins 54).

[0137] This spring force—if the two bayonets 50, 52 are closed—has the effect that the second bayonet 52 is braced (here, the draw-in-collet-side and coupling-element-side clamping faces 68 of the clamping shoulders 60, 58 are each braced against one another in pairs by the spring force) but the first bayonet 50 is positioned free of axial 80 force in the process (here, the locking pins 54 are each “axially free” in the locking stops 56 or transverse grooves 62).

[0138] Tension Rod

[0139] As FIG. 2 in particular also shows, an elastic region 30—in the form of a corrugated-bellows-like region 30—is furthermore also formed on the tension rod 32—so as to face the tool side—directly behind the screwed-on coupling element 6 or tension sleeve 8.

[0140] If there is a force flow of a clamping/drawing-in force, that axially 80 draws in the draw-in collet 4, over this flexurally elastic region 30, this elastic region 30 can deform in such a way that the (axial) tensile forces (when a tool is being clamped) are distributed evenly over the clamping surfaces 68 or clamping shoulders 58, 60 (of the second bayonet 52)—and thus ensure that the draw-in collet 4 is drawn in in a self-centered manner.

[0141] Main Body

[0142] As is also further depicted in FIG. 1, the main body 10 provides a concentricity adjusting device 34.

[0143] To that end, the main body 10 is in two parts—with a “front” first sub-body 104 facing the tool/workpiece and an adjacent second sub-body 106.

[0144] The first sub-body 104 is placed on an attachment flange 108 of the second sub-body 106—and can be radially 86 positioned by means of concentricity adjusting screws 36.

[0145] As can be seen furthermore also in particular in FIG. 2, the main body 10 may provide a radially inwardly protruding—in this case segmentally peripherally interrupted—shoulder 116 that serves as a stop. A (stop) shoulder 114 is located on the draw-in collet 4—in a correspondingly complementary manner.

[0146] When the draw-in collet 4 is drawn into the main body 10, the two shoulders 114/116 can abut one another. That is to say, the maximum extent to which axial drawing-in of the draw-in collet 4 can occur is delimited, this delimitation being able to prevent damage to the draw-in collet 4 in particular if it is drawn into the main body 10 empty (i.e. without a tool/workpiece).

[0147] Insertion of the Draw-In Collet and Actuation of the Bayonet

[0148] If—by way of example—a new draw-in collet 4 is to be inserted into the clamping device 2 (i.e., the old draw-in collet 4 has been removed from the clamping device 2 beforehand), this is done as depicted by the arrows P1, P2 and P3 in FIG. 1, as follows.

[0149] When inserting the draw-in collet 4 into the main body 10, the draw-in collet 4 is axially displaced relative to the coupling element 6 or tension sleeve 8, or pushed into the coupling element 6 or tension sleeve 8, by applying an external force (for example by means of the mounted insertion aid (which is not shown)) counter to the spring force of the clamping mechanism 72 (see above) (cf. P1 in FIG. 1).

[0150] Here, at the same time the coupling-element-side clamping shoulders 58 of the second bayonet 52 and the coupling-element-side locking pins 54 of the second bayonet 52 are pushed through or into the draw-in-collet-side common longitudinal grooves 66 (belonging to the first bayonet 50 and the second bayonet 52).

[0151] Axially pushing the draw-in collet 4 into the coupling element 6 or tension sleeve 8—into a predefined position—is delimited by an outer shoulder 110 on the draw-in collet 4, against which the clamping shoulders 58 of the coupling element 6 or of the tension sleeve 8 can be placed by way of their tool-side boundary surfaces 112.

[0152] If the draw-in collet 4, under the external force (insertion aid), is then rotated by approximately 60° relative to the coupling element (cf. P2 in FIG. 1), the locking pins 54 of the first bayonet 50—pushed over the undercuts 64—come into the stops of the transverse grooves 62 of the first bayonet 50.

[0153] At the same time the—draw-in-collet-side and coupling-element-side —clamping shoulders 60, 58 or their clamping surfaces 68 of the second bayonet 52 completely overlap (in pairs)—but still without the clamping shoulders 60, 58 or the clamping surfaces 68 of the second bayonet 52 being placed against one another.

[0154] Then, the external force on the draw-in collet 4 is withdrawn (, with the spring force of the clamping mechanism 72 then axially 80 displacing the draw-in collet 4) (cf. P3 in FIG. 1), with the result that the first bayonet 50 is locked, by virtue of the fact that the locking pins 54 of the first bayonet 50 enter the undercuts 64—and (, as a result of the spring force of the clamping mechanism 72,) the second bayonet 52 is braced, in that the clamping shoulders 58, 60 of the second bayonet 52 or their clamping shoulders 68 come into abutment —under compressive loading caused by the clamping mechanism 72.

[0155] If the clamping device 2 is then in the state in which the first bayonet 50 is locked and the second bayonet 52 is braced, the first bayonet 50 is free of axial force and the second bayonet 52 is under pretension.

[0156] Although the invention has been illustrated and described in more detail by the preferred exemplary embodiments, the invention is not restricted by the examples disclosed and other variations can be derived therefrom, without departing from the scope of protection of the invention.

[0157] The following is a summary list of reference numerals and the corresponding structure used in the above description of the invention: [0158] 2 Clamping device [0159] 4 Draw-in collet [0160] 6 Coupling element, tension sleeve [0161] 8 Tension sleeve [0162] 10 Main body, clamping body [0163] 12 (hydraulic/pneumatic/electromechanical) (continuously adjustable) clamping/drawing-in system [0164] 14 Inner cone, conical receiving opening/bore [0165] 16 Outer cone, outer casing [0166] 18 Cone angle [0167] 20 Slot [0168] 22 Spreading element, elastomer filling [0169] 24 Bore [0170] 26 Spring, spring loaded [0171] 28 Pressing ring [0172] 30 Flexurally elastic region, (corrugated—) bellows-like region [0173] 32 Tension rod [0174] 34 Concentricity adjusting device [0175] 36 Concentricity adjusting screw [0176] 38 Widening distance [0177] 40 Receiving region [0178] 42 (Corrugated) bellows, (corrugated—) bellows-like [0179] 46 On the inside, inner circumference [0180] 48 On the outside, outer circumference [0181] 50 First bayonet closure (locking means) [0182] 52 Second bayonet closure (bracing means) [0183] 54 Coupling-element-side bayonet closure element of the first bayonet closure, locking element, latching pin [0184] 56 Draw-in-collet-side bayonet closure element of the first bayonet closure, locking stop, end stop [0185] 58 Coupling-element-side bayonet closure element of the second bayonet closure, clamping shoulder [0186] 60 Draw-in-collet-side bayonet closure element of the second bayonet closure, clamping shoulder [0187] 62 Transverse groove [0188] 64 Undercut [0189] 66 Longitudinal groove (common draw-in-collet-side bayonet closure element) [0190] 68 Clamping surface [0191] 70 Center axis [0192] 72 Clamping mechanism [0193] 80 Axial, axial direction [0194] 84 (Cylindrical) inner casing, receiving opening [0195] 86 Radial, radial direction [0196] 88 Tongue [0197] 90 End face/edge [0198] 92 Annular groove [0199] 94 Internal thread [0200] 96 External thread [0201] 98 Receiving opening (for spring 26) [0202] 100 (Peripheral) shoulder [0203] 102 Inner through-opening of the coupling element 6 [0204] 104 First sub-body [0205] 106 Second sub-body [0206] 108 Attachment flange [0207] 110 (Outer) shoulder [0208] 112 Boundary surface [0209] 114 (Stop) shoulder [0210] 116 (Stop) shoulder [0211] P1, P2, P3 Arrows