Clamping drive and method for fixing a jaw carrier of a clamping drive

Abstract

The invention relates to a clamping drive (1) with a first clamping part (2) and a second clamping part (3), wherein the first clamping part (1) is connectable to a first jaw carrier (8) and wherein the second clamping part (3) is connectable to a second jaw carrier (10), wherein the first clamping part (2) and the second clamping part (3) are translationally movable relative to each other by means of a drive spindle (5), wherein the first jaw carrier (8) or the second jaw carrier (10) is attachable to a lower part (9), and wherein the first jaw carrier (8) or the second jaw carrier (10) is slid onto the lower part (9) in the direction of the translational movement of the first clamping part (2) and the second clamping part (3). In a clamping drive (1) that makes it possible to extend the clamping range of a clamping drive, in particular a clamping drive for a vise,To achieve the simplest possible conversion measures while maintaining high load-bearing capacity of the clamping drive, it is provided that at least one first clamping surface (12) is formed on the lower part (9) for fastening the first jaw carrier (8) or the second jaw carrier (10) to the lower part (9), that at least one second clamping surface (13) corresponding to the first clamping surface (12) of the lower part (9) is formed on at least one clamping nut (14) arranged on the jaw carrier (8, 10), that the first clamping surface (12) and the second clamping surface (13) are in contact when the jaw carrier (8, 10) is pushed onto the lower part (9), and that a clamping force between the first clamping surface (12) and the second clamping surface (13) can be achieved via the first clamping nut (14).

Description

[0001] The invention relates to a clamping drive with a first clamping part and with a second clamping part, wherein the first clamping part can be connected to a first jaw carrier and wherein the second clamping part can be connected to a second jaw carrier, wherein the first clamping part and the second clamping part can be moved translationally relative to one another by a drive spindle, wherein the first jaw carrier or the second jaw carrier can be fastened to a lower part, wherein the first jaw carrier and / or the second jaw carrier can be pushed onto the lower part in the direction of the translational mobility of the first clamping part and the second clamping part.

[0002] In addition, the invention relates to a method for fastening a jaw carrier of a clamping drive.

[0003] Clamping drives, particularly for vices, are known in the art in a wide variety of designs. As a rule, the jaw carriers are moved towards each other by rotating the drive spindle. One jaw carrier is fixed, while the other jaw carrier is moved by actuating the drive spindle. Clamping jaws are usually attached to the jaw carriers, with which a workpiece can be fixed. After rotation of the drive spindle, the clamping jaws rest against a workpiece to be clamped. As the drive spindle continues to rotate, a clamping force builds up between the clamping parts, which is transferred to the workpiece via the clamping jaws. A specific clamping force between the clamping parts corresponds to a specific torque applied to the spindle of the clamping drive by a turning tool.Depending on the geometry of the clamping jaws, this clamping force of the clamping drive results in a more or less large clamping force acting on the workpiece.

[0004] Depending on the dimensions or geometric configuration of the workpiece, clamping the workpiece between the clamping jaws can be problematic if the dimensions of the workpiece exceed the travel range of the jaw carriers or clamping jaws. For example, there are concepts for extending the drive spindle in order to expand the clamping range of the clamping drive. Clamping drives with jaw carriers and clamping jaws that are designed so flexibly usually require complex modifications to adapt the clamping drive to the existing conditions. At the same time, sufficient stability of the connections between the components must be ensured so that the clamping drive can be operated safely even under high clamping forces.

[0005] The invention is therefore based on the object of specifying a clamping drive and a method which make it possible to extend the clamping range of a clamping drive, in particular a clamping drive for a vice, whereby the conversion measures are to be as uncomplicated as possible while at the same time ensuring a high load capacity of the clamping drive.

[0006] This object is achieved in the present invention by the features of the characterizing part of patent claim 1, firstly in that for fastening the first jaw carrier and / or the second jaw carrier to the lower part, at least one first clamping surface is formed on the lower part, that at least one second clamping surface corresponding to the first clamping surface of the lower part is formed on at least one clamping nut arranged on the jaw carrier, that the first clamping surface and the second clamping surface are connected when the jaw carrier is pushed onto the lower part, and that a clamping force between the first clamping surface and the second clamping surface can be realized via the clamping nut.

[0007] The clamping parts can be designed to be inserted into the respective jaw carrier with a form-fitting connection. Due to the form-fitting connection and the fastening of the clamping parts to the drive spindle, the drive spindle cannot be completely removed from the jaw carrier. The clamping parts preferably have a larger cross-section than the drive spindle or the extension element. The clamping parts can thus be inserted into a corresponding recess in the jaw carrier, wherein an opening for the drive spindle is simultaneously formed in the recess, the opening having a cross-section smaller than the recess. Once the clamping part is inserted into the recess, the drive spindle cannot be moved further in the opening in the insertion direction.

[0008] The jaw supports can be attached to a base, such as a support rail. Using the support rail, the jaw supports can be moved along the base in one direction without changing their orientation in other directions.

[0009] The drive spindle can be driven or rotated by means of an additional tool or, for example, a crank mounted on the drive spindle. The drive spindle can be essentially cylindrical.

[0010] When the jaw carrier is clamped to the lower part, the first clamping surface and the second clamping surface are in contact, with the clamping force being transmitted via the two clamping surfaces. The clamping nut is designed such that it can be moved independently of the jaw carrier within the jaw carrier, so that a clamping force can be exerted on the lower part without deforming the jaw carrier.

[0011] Further preferred embodiments of the invention emerge from the remaining features mentioned in the subclaims.

[0012] In a first embodiment of the clamping drive according to the invention, the first clamping surface and the second clamping surface are oriented such that the jaw carrier is brought into an undercut with the lower part by the second clamping surface. When the jaw carrier is pushed onto the lower part in the longitudinal direction of the lower part, the undercut ensures that the jaw carrier can be moved in the longitudinal direction of the lower part but cannot be lifted off the lower part. A profile can be formed in the jaw carrier that corresponds to the cross-section of the lower part, so that a positive connection is formed when the jaw carrier is pushed onto the lower part. The orientation of the clamping surface can, for example, form a dovetail-type connection.

[0013] In a further preferred embodiment of the clamping drive according to the invention, the first clamping surface is beveled such that the first clamping surface is arranged at an angle of 45 degrees, preferably 30 degrees, particularly preferably 20 degrees, relative to a plane spanned by the longitudinal extent of the lower part and the height of the lower part. The clamping surface is thus tilted relative to the perpendicular to the longitudinal extent of the lower part. By tilting, a clamping force can be applied laterally to the jaw carrier via the clamping nut. At the same time, this prevents the jaw carrier from being pushed upwards away from the lower part if the clamping force is sufficiently large.

[0014] Additionally, a further embodiment of the invention provides for the first clamping surface to extend in the longitudinal direction of the lower part. The first clamping surface can extend over the entire length of the lower part, allowing flexible locking of the jaw carrier at any desired section of the lower part. At the same time, the corresponding jaw carrier can also be pushed onto the lower part, where it is then arranged displaceably on or at the lower part. This simultaneously enables guidance of the displaceable jaw carrier.

[0015] In a particularly advantageous embodiment of the clamping drive according to the invention, it is provided that a through-bore is formed in the clamping nut, that a spindle is arranged floating in the through-bore, wherein the through-bore extends approximately perpendicular to the longitudinal extent of the lower part, wherein a first clamping recess and a second clamping recess opposite the first clamping recess are formed by the through-bore, wherein a first fastening element can be inserted into the first clamping recess and a second fastening element can be inserted into the second clamping recess and wherein the first fastening element and the second fastening element can be displaced in opposite directions against a stop in the direction of the through-bore, so that a clamping force can be applied indirectly between the first clamping surface and the second clamping surface via the stop.At least one stop can be formed on the clamping nut so that a force is applied to the clamping nut via the fastening element, whereby the clamping nut or the second clamping surface is moved in the direction of the first clamping surface on the lower part. In other words, the clamping nut is pulled inwards, in the direction of the longitudinal axis of the lower part, by the combination of the spindle and the fastening elements. Since the clamping nut can be movably mounted in the jaw carrier, with stops being provided at the same time by which the clamping nut or the second clamping surface is indirectly moved in the direction of the first clamping surface, a clamping force is exerted on the lower part in such a way that the jaw carrier is also fixed in the longitudinal direction of the lower part. The second stop can, for example, be formed in the jaw carrier so that a counter-bearing is formed by which the clamping nut can ultimately be pulled inwards.

[0016] In a particularly preferred embodiment of the clamping drive according to the invention, however, two clamping nuts are provided, wherein the first clamping recess is formed in the first clamping nut and wherein the second clamping recess is formed in the second clamping nut. The clamping nuts can then be arranged on opposite sides in the jaw carrier, wherein the clamping nuts are moved towards each other when the fastening elements are inserted into the spindle. Accordingly, a further first clamping surface and a further second clamping surface can also be provided, so that clamping can be achieved by one clamping nut each on opposite sides of the jaw carrier on the lower part.

[0017] In order to improve handling when attaching the jaw carrier to the lower part, a further embodiment of the invention provides for the clamping nut to be inserted into the jaw carrier in a form-fitting manner, wherein the clamping nut is secured against displacement in the longitudinal direction of the lower part. In this case, the clamping nut can also have a dovetail-like contour. Due to the form-fitting connection, the clamping nut can only be moved into or out of the jaw carrier perpendicular to the longitudinal extent of the lower part. Due to the combination of inserted spindle and fastening elements, the clamping nut or the clamping nuts are at least partially fixed perpendicular to the longitudinal extent of the lower part.

[0018] In a particularly preferred embodiment of the clamping drive according to the invention, the fastening elements are designed as clamping screws that can be screwed into the spindle by means of a thread and a corresponding thread formed in the spindle. In this way, a user can easily screw the fastening elements into the spindle and accordingly continuously build up a clamping force that serves to fix the jaw carrier. This minimizes the risk of excessive clamping force being built up, which could lead to damage to the clamping drive.

[0019] The thread of the clamping screw can be designed so that, starting at a certain screw-in depth, approximately a quarter turn is sufficient to apply a torque of 50 Nm. The torque indirectly transmits the clamping force between the first clamping surface and the second clamping surface.

[0020] Advantageously, a further embodiment of the clamping drive according to the invention provides a first clamping screw and a second clamping screw, with the first clamping screw having a left-hand thread and the second clamping screw having a right-hand thread. In combination with the floating bearing of the spindle, the jaw carrier can also be secured from only one side in this way, whereby the floating bearing can compensate for any offset caused by a different screw-in depth of the clamping screws.

[0021] In a further embodiment of the clamping drive according to the invention, the stop can be implemented by means of at least one stop screw, wherein the stop screw can be screwed into the jaw carrier in such a way that it is positioned in an undercut with the clamping nut. In this way, the clamping nut cannot be removed from the jaw carrier. A first limitation of the movement of the clamping nut is the stop, which prevents the clamping nut from falling out of the jaw carrier. A second stop in the opposite direction is formed by the first clamping surface or the second clamping surface.

[0022] The aforementioned object is also achieved by a method for fastening a jaw carrier of a clamping drive according to the invention, wherein the first jaw carrier and / or the second jaw carrier are pushed onto the lower part and wherein the first jaw carrier or the second jaw carrier are fastened to the lower part via the clamping nut. The above statements regarding the clamping drive according to the invention also apply accordingly to the method according to the invention.

[0023] The various embodiments of the invention mentioned in this application can be advantageously combined with one another, unless otherwise stated in the individual case.

[0024] The invention is explained below in exemplary embodiments with reference to the accompanying drawings. They show: Figure 1 shows a perspective view of an embodiment of a tensioning drive, Figure 2 shows a further perspective view of an embodiment of a tensioning drive, wherein only clamping nuts are shown and Figure 3 shows a side view of the embodiment according to Figure 1 .

[0025] Figure 1shows a clamping drive 1 for a vice with a first clamping part 2 and a second clamping part 3. The first clamping part 2 and the second clamping part 3 are each connected to a jaw carrier 4. The first clamping part 2 and the second clamping part 3 can be moved translationally relative to one another by a drive spindle 5. The first clamping part 2 is arranged on a first end face 6 of the drive spindle 5. The second clamping part 3 is arranged on a second end face 7 of the drive spindle 5. The first clamping part 2 is detachably connected to the drive spindle 5. A first jaw carrier 8 is fastened to a lower part 9 in the form of a support rail. A second jaw carrier 10 is arranged on the lower part 9 so that it can be moved in the axial direction of the support rail. When the drive spindle 5 is actuated, the second jaw carrier 10 is moved so that the jaw carriers 4 are moved towards one another relative to one another. Clamping jaws 11 are arranged on the jaw supports 4.The clamping jaws 11 are used to clamp a workpiece not shown here for further processing.

[0026] In Figure 2 is a section of the embodiment according to Figure 1 shown. Figure 2 It can be seen how the first jaw carrier 8 is fastened to the lower part 9. For this purpose, a first clamping surface 12 is formed on the lower part 9. In addition, a second clamping surface 13, corresponding to the first clamping surface 12 of the lower part 9, is formed on a clamping nut 14 arranged on the first jaw carrier 8. The first clamping surface 12 and the second clamping surface 13 are connected when the first jaw carrier 8 is pushed onto the lower part 9. A clamping force is applied between the first clamping surface 12 and the second clamping surface 13 via the clamping nut 14.

[0027] The first clamping surface 12 and the second clamping surface 13 are oriented such that the first jaw carrier 8 is brought into an undercut with the lower part 9 by the second clamping surface 13. As a result, the first jaw carrier 8 can be moved in the longitudinal direction of the lower part 9, but cannot be lifted off the lower part 9. A corresponding profile 15 is formed in the clamping nut 14, which partially corresponds to the cross-section or contour of the lower part 9, so that when the first jaw carrier 8 is pushed onto the lower part 9, a positive connection is formed partially via the clamping nut 14. The first clamping surface 12 is chamfered such that the first clamping surface 12 is tilted at an angle of 30 degrees relative to a plane spanned by the longitudinal extent of the lower part and the height of the lower part. By tilting, a clamping force can be applied laterally from the first jaw carrier 8 via the clamping nut 14.At the same time, it is prevented that the first jaw carrier 8 is pushed upwards away from the lower part 9 if the clamping force is sufficiently large.

[0028] The first clamping surface 12 extends longitudinally over the entire length of the lower part 9, allowing flexible locking of the first jaw carrier 8 at any desired section of the lower part 9. At the same time, the second jaw carrier 10 can also be pushed onto the lower part 9, where it is then slidably arranged on the lower part 9. This simultaneously enables guidance of the slidable second jaw carrier 10.

[0029] In order to generate a sufficient clamping force between the first jaw carrier 8 and the lower part 9, a through-bore 16 is formed in the clamping nut 14, with a spindle 17 floatingly arranged in the through-bore 16. The through-bore 16 extends perpendicular to the longitudinal extent of the lower part 9. In this embodiment, two clamping nuts 14 are provided, with a first clamping recess 18 formed in the first clamping nut 14 and a second clamping recess 19 formed in the second clamping nut 20. The clamping nuts 14, 20 are arranged on opposite sides in the first jaw carrier 8.

[0030] A first fastening element 21 is inserted into the first clamping recess 18 and a second fastening element 22 into the second clamping recess 19. The first fastening element 21 and the second fastening element 22 are displaced in opposite directions against a stop 23 in the direction of the through-bore 16, such that a clamping force can be applied indirectly between the first clamping surface 12 and the second clamping surface 13 via the stop 23. The stops 23 are each formed on the first clamping nut 14 and the second clamping nut 20. In this way, a force is applied to the first clamping nut 14 and the second clamping nut 20 via the first fastening element 21 or the second fastening element 22, wherein the second clamping surface 13 is moved in the direction of the first clamping surface 12 on the lower part 9.In other words, the first clamping nut 14 and the second clamping nut 20 are pulled inward, in the direction of the longitudinal axis of the lower part 9, by the combination of the spindle 17 and the first fastening element 21 or the second fastening element 22. Since both the first clamping nut 14 and the second clamping nut 20 are movably mounted in the first jaw carrier 8, a clamping force is exerted on the lower part 9 such that the first jaw carrier 8 is also fixed in the longitudinal direction of the lower part 9.

[0031] The clamping nuts 14, 20 move towards each other when the fastening elements 21, 22 are inserted into the spindle 17. In this case, clamping is achieved by one clamping nut 14, 20 each on opposite sides of the first jaw carrier 8. The first clamping nut 14 and the second clamping nut 20 can be inserted into the first jaw carrier 8 in a form-fitting manner. In this way, the first clamping nut 14 and the second clamping nut 20 are secured against displacement in the longitudinal direction of the lower part 9. Due to the form-fitting arrangement, the first clamping nut 14 and the second clamping nut 20 can only be moved into or out of the first jaw carrier 8 perpendicular to the longitudinal extent of the lower part 9. Due to the combination of the inserted spindle 17 and the first fastening element 21 and the second fastening element 22, the clamping nuts 14, 20 are also at least partially fixed perpendicular to the longitudinal extent of the lower part 9.

[0032] The fastening elements 21, 22 are designed as clamping screws that can be screwed into the spindle 17 by means of a thread and a corresponding thread formed in the spindle 17. In this way, a user can easily screw the first fastening element 21 and the second fastening element 22 into the spindle 17 and accordingly build up a continuously variable clamping force that serves to fix the first jaw carrier 8 on the lower part 9. This minimizes the risk of generating excessive torque, which is transmitted to a large clamping force that could lead to damage to the clamping drive 1. The first clamping screw or the first fastening element 21 has a left-hand thread. The second clamping screw or the second fastening element 22 has a right-hand thread.In combination with the floating bearing of the spindle 17, the first jaw carrier 8 can also be fastened in this way only from one side, whereby the floating bearing can compensate for an offset caused by a different screw-in depth of the clamping screws.

[0033] To prevent the first clamping nut 14 and the second clamping nut 20 from falling out of the first jaw carrier 8, a further stop is provided by means of at least one stop screw 24. The stop screw 24 can be screwed into the first jaw carrier 8 in such a way that it is brought into an undercut with the first clamping nut 14 or the second clamping nut 20. In this way, the first clamping nut 14 or the second clamping nut 20 cannot be removed from the first jaw carrier 8. A first limitation in the movement of the clamping nuts 14, 20 is the further stop via the stop screw 24, which prevents the clamping nuts 14, 20 from falling out of the first jaw carrier 8. A second stop in the opposite direction is formed by the first clamping surface 12 or the second clamping surface 13.

[0034] Figure 3shows a side view of the clamping drive 1, in which it can be seen that the first clamping nut 14 is inserted into the first jaw carrier 8 in a form-fitting manner. In this exemplary embodiment, the first clamping nut 14 has a dovetail-like cross-section. Accordingly, a recess 25 is formed in the first jaw carrier 8, the contour of which corresponds to the cross-section of the first clamping nut 14. List of reference symbols

[0035] 1Clamping drive 2First clamping part 3Second clamping part 4Jaw carrier 5Drive spindle 6First end face 7Second end face 8First jaw carrier 9Lower part 10Second jaw carrier 11Clamping jaws 12First clamping surface 13Second clamping surface 14First clamping nut 15Profile 16Through hole 17Spindle 18First clamping recess 19Second clamping recess 20Second clamping nut 21First fastening element 22Second fastening element 23Stop 24Stop screw 25Recess

Claims

1. Clamping drive (1) with a first clamping part (2) and with a second clamping part (3), wherein the first clamping part (1) is connectable to a first jaw carrier (8) and wherein the second clamping part (3) is connectable to a second jaw carrier (10), wherein the first clamping part (2) and the second clamping part (3) are translationally movable relative to one another by a drive spindle (5), wherein the first jaw carrier (8) or the second jaw carrier (10) is attachable to a lower part (9), wherein the first jaw carrier (8) or the second jaw carrier (10) is slidable onto the lower part (9) in the direction of the translational mobility of the first clamping part (2) and the second clamping part (3), characterized by that for fastening the first jaw carrier (8) or the second jaw carrier (10) to the lower part (9), at least one first clamping surface (12) is formed on the lower part (9), thatat least one second clamping surface (13) corresponding to the first clamping surface (12) of the lower part (9) is formed on at least one clamping nut (14) arranged on the jaw carrier (8, 10), that the first clamping surface (12) and the second clamping surface (13) are connected when the jaw carrier (8, 10) is pushed onto the lower part (9) and that a clamping force between the first clamping surface (12) and the second clamping surface (13) can be realized via the first clamping nut (14).

2. Tensioning drive (1) according to claim 1, characterized in that the first clamping surface (12) and the second clamping surface (13) are oriented such that the jaw carrier (8, 10) is brought into an undercut with the lower part (9) by the second clamping surface (13).

3. Tensioning drive (1) according to claim 1 or 2, characterized in thatthe first clamping surface (12) is bevelled such that the first clamping surface (12) is arranged at an angle of 45 degrees, preferably 30 degrees, particularly preferably 20 degrees, relative to a plane spanned by the longitudinal extent of the lower part (9) and the height of the lower part (9).

4. Tensioning drive (1) according to one of claims 1 to 3, characterized in that the first clamping surface (12) extends in the longitudinal direction of the lower part (9).

5. Tensioning drive (1) according to one of claims 1 to 4, characterized in thata through-bore (16) is formed in the clamping nut (14), a spindle (17) is arranged floating in the through-bore (16), the through-bore (16) extending approximately perpendicular to the longitudinal extent of the lower part (9), a first clamping recess (18) and a second clamping recess (19) opposite the first clamping recess (18) being formed by the through-bore (16), a first fastening element (21) being insertable into the first clamping recess (18) and a second fastening element (22) being insertable into the second clamping recess (19), and the first fastening element (21) and the second fastening element (22) being displaceable in opposite directions against a stop (22) in the direction of the through-bore (16), so that a clamping force can be applied indirectly between the first clamping surface (12) and the second clamping surface (13) via the stop (22).

6. Tensioning drive (1) according to claim 4, characterized in thattwo clamping nuts are provided, wherein the first clamping recess (18) is formed in the first clamping nut (14) and wherein the second clamping recess (19) is formed in the second clamping nut (20).

7. Tensioning drive (1) according to one of claims 1 to 6, characterized in that the clamping nut (14) can be inserted into the jaw carrier (8, 10) in a form-fitting manner, wherein the clamping nut (14) is secured against displacement in the longitudinal direction of the lower part (9).

8. Tensioning drive (1) according to one of claims 5 to 7, characterized in that the fastening elements (21, 22) are designed as clamping screws which can be screwed into the spindle (17) by means of a thread and a corresponding thread formed in the spindle (17).

9. Tensioning drive (1) according to claim 8, characterized in that a first clamping screw and a second clamping screw are provided and that the first clamping screw has a left-hand thread and the second clamping screw has a right-hand thread.

10. Tensioning drive (1) according to one of claims 5 to 9, characterized in that a further stop is realized by means of at least one stop screw (24), wherein the stop screw can be screwed into the jaw carrier (8, 10) in such a way that it is brought into an undercut with the clamping nut (14, 20).

11. Method for fastening a jaw carrier (8, 10) of a clamping drive (1) according to one of claims 1 to 10, wherein the first jaw carrier (8) or the second jaw carrier (10) is pushed onto the lower part (9) and wherein the first jaw carrier (8) or the second jaw carrier (10) is fastened to the lower part (9) via the clamping nut (14).