DE8020142U1 - CLAMPING TOOL FOR CLAMPING DISC-SHAPED OBJECTS, e.g. TOOLS, PREFERABLY FROM SAW BLADES - Google Patents

Description

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July 11, 1980

Benz, Werkzeug- und Maschinenbau KG, 7612 Haslach (Kinzigtal)

Clamping tool for clamping disc-shaped Objects, e.g. B. Tools, preferably saw blades.

The invention relates to a clamping tool for clamping disc-shaped objects such. B. Tools, preferably of saw blades, between a stationary contact surface on a support shaft and one on the support shaft back and forth adjustable counter surface.

In the known arrangements of the type in question here, the clamping and loosening takes place by screwing of two parts that support the two surfaces - the contact surface and the counter surface - in order in this way to the two To move surfaces towards or away from each other. However, this results in the loss of a large part the clamping force due to the friction on the screw head and in the thread, so that the resulting performance is only relative is low, which z. B. can be unfavorable if

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for objects made of solid carbide or for so-called HSS saw blades do not have any driving bores. The invention aims to remedy this.

For the above purpose, the invention has set itself the task of creating an arrangement of the type in question here to create in which no friction losses occur during clamping. For the above purpose is according to the invention In the new arrangement it is provided that the support shaft can be displaced as a guide cylinder for one in it guided, connected to the mating surface piston is formed, on the one hand under the pressure of a within the meaning of Tensioning acting spring arrangement, preferably a disk spring assembly is and on the other hand for relief a hydraulic pressure acting in the sense of relaxation can be brought about. Here, for example, the arrangement can be as follows be made that the subspace of the guide cylinder on that of the spring arrangement, preferably the disc spring assembly, the side facing away from the piston contains pressure medium, preferably hydraulic oil, where expediently the pressure medium, preferably hydraulic oil containing subspace of the guide cylinder via a channel or the like. with one in one Partial space is also connected to pressure medium, preferably hydraulic oil containing actuating cylinder, in which an externally operable actuating piston is displaceable back and forth. It is particularly advantageous if the

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both use the same pressure medium, preferably hydraulic oil
containing subspaces of the guide cylinder and the
Actuating cylinder are in communication with one another via the channel which is located at the end of the actuating cylinder facing away from the actuating side and
runs approximately parallel to the longitudinal axis of the guide cylinder. An externally actuatable actuating screw guided in and screwed out in a threaded section of the actuating cylinder, preferably at the end facing away from the channel, is expediently used to actuate the actuating piston.

The arrangement according to the invention has the advantage that the clamping force is no longer caused by friction losses associated operation must be generated, since the tensioning by spring force and the relaxation by hydraulic Printing takes place.

In the drawing, an embodiment of the object of the invention is in a side view in section shown.

The clamping tool according to the invention is used to clamp, for example, the saw blade 1 between the stationary contact surface 2 on the support shaft 3 and one on the support shaft according to the arrows

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5 back and forth adjustable counter surface 4.

According to the invention, the (drag shaft 3 as a guide cylinder, as you know them from hydraulics or pneumatics. There is a piston in this guide cylinder

6 guided back and forth, which is connected to the counter surface 4 in a manner still shown below and on the one hand under the pressure of a spring arrangement 7 » which can consist of a disk spring package, which acts in the sense of tensioning and here strives to To adjust the opposite surface in the direction of arrow 5A, and which, on the other hand, are brought to relief under a hydraulic pressure acting in the sense of relaxation can.

The mating surface 4 is provided on a disc 8 which one extending in the axial direction of the guide cylinder 3 and expediently coaxially therewith The spindle 9 has an external thread at its free end and which can be screwed with the piston 6 and unscrewed is connected, as shown at 10. The outwardly projecting head 11 of the spindle is made easy to grip, e.g. by being provided with a knurl or by being designed as a hexagon. The contact surface 2 is located at the The embodiment shown in the drawing partially on the end face of the outer cylinder 3 (partial surface 2a)

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on the side facing the opposite surface and partially on the outer surface of a base piece 16 screwed into the guide cylinder at this end. This base piece can also be screwed onto the guide cylinder be. The arrangement can also be made so that the contact surface on the outside of the guide cylinder on the end face facing the opposite surface, the closing bottom piece is provided, which is provided with the guide cylinder is connected by screwing. In this case, the end face of the guide cylinder does not come into contact with the object to be clamped.

The plate spring assembly 7 forming the spring arrangement is located on the side of the piston facing the base piece 16, it is supported on the one hand on the base piece 16 and on the other hand on the piston. The subspace 12 of the guide cylinder, which faces away from the disk spring package Side of the piston is located, contains pressure medium, preferably hydraulic oil, this subchamber 12 of the guide cylinder is via a channel 13 with a subchamber IA-des Actuating cylinder 15 connected, which is also hydraulic oil contains. The actuating piston 17 is displaceable back and forth in the actuating cylinder. Here are the two the same pressure medium, preferably hydraulic oil containing sub-spaces 12 of the guide cylinder 3 and 14 of the actuation

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cylinder 15 connected to each other via channel IJ, which is located at the end of the actuating cylinder facing away from the actuating side 18 and approximately parallel to the The longitudinal axis of the guide cylinder 3 runs. It can be seen that the actuating cylinder is the guide cylinder 3 in the sense of the movement when relaxing according to the arrow

5b is connected upstream, the advance movement of the actuator is preferred
Piston 17 runs / at right angles to the feed movement of piston 6 in guide cylinder 3- To actuate actuating piston 17, an actuating screw 19, which can be actuated from outside, is used, which can be screwed in and out of a threaded portion 20 of the actuating cylinder on the side facing away from channel 12 . This screw can from the outside, for example with the help of a socket wrench or the like. be actuated, it is connected to the actuating piston via the intermediate piece 21, which is carried by the actuating piston on the side facing the actuating screw and can, for example, have the shape of a spherical cap.

The two pistons are guided in a sealed manner in the usual way with the aid of O-rings and the like.

Claims (1)

Expectations Λ. Clamping tool for clamping disc-shaped objects, e.g. B. tools, preferably of saw blades, between a stationary contact surface on a support shaft and a back and forth adjustable counter surface on the support shaft, characterized in that the support shaft is designed as a guide cylinder for a slidably guided in it, connected to the counter surface piston, the one hand is under the pressure of a spring arrangement acting in the sense of tensioning, preferably a plate spring assembly, and on the other hand, to relieve the load, the cart is brought under a hydraulic pressure acting in the sense of relaxation - 2 - »Ι ·· itttti ·· ·· til I> »Ο * · · * lilt I. - i (J - i t · ■ Il «ft 't tv t ·« I) IlII ti I ·· a · 2. Clamping tool according to claim 1, characterized in that the mating surface is provided on a disc which one in the axial direction of the guide cylinder and expediently Coaxially with this extending, at its free end external thread bearing spindle "has which with the piston is connected screwed in and unscrewed. 3. Clamping tool according to claim 2, characterized in that that the outwardly protruding head of the spindle is made handy, z. B. by being provided with a knurling or as Hexagon is formed. 4. Clamping tool according to one of claims 1 to 3, characterized in that the contact surface on one of the guide cylinder on the end face facing the opposite surface, the closing bottom piece is provided, which is provided with the guide cylinder is connected by screwing. 5. Clamping tool according to one of claims 1 to 3, characterized characterized in that the contact surface is partially through the end surface of the outer cylinder on the opposite surface facing end and partially through the outer surface of one at this end in the guide cylinder or on this screwed-on bottom part is formed. 6. Clamping tool according to claim 4 or 5 *, characterized in that that the Pedern arrangement, preferably the disc spring package, is supported on the one hand on the base piece and on the other hand on the piston. _ 5 - 11 * 1 ■ It t · · 7. Clamping tool according to one of claims 4 to 6, characterized characterized in that the spring arrangement, preferably the disc spring assembly, is located on the one facing the bottom piece Side of the piston. 8. Clamping tool according to one of claims 1 "to 7> characterized in that the subspace of the guide cylinder on the the spring arrangement, preferably the side of the piston facing away from the disc spring assembly, pressure medium, preferably hydraulic contains oil. 9. Clamping tool according to claim 8, characterized in that the pressure medium, preferably containing hydraulic oil Partial space of the guide cylinder od via a channel. in connection with an actuating cylinder which also contains pressure medium, preferably hydraulic oil, in a subspace stands in which an externally operable actuating piston can be moved back and forth. 10. Clamping tool according to claim 9 _5, characterized in that the two subspaces of the guide cylinder and the actuating cylinder containing the same pressure medium, preferably hydraulic oil, are in communication with one another via the channel which is located at the end of the actuating cylinder facing away from the actuating side and approximately parallel to the longitudinal axis. hse of the guide cylinder. 11. Clamping tool according to claim 9 or 10, characterized in that that the actuating cylinder corresponds to the! guide s cylinder t t · · · · «II in the sense of movement "is upstream when relaxing. 12. Clamping tool according to one of claims 9 to 11, characterized characterized in that the advancing movement of the actuating piston is perpendicular to the advancing movement of the piston in the Guide cylinder runs. 15. Clamping tool according to one of claims 9 to 12, characterized characterized in that for actuating the actuating piston an externally actuatable, in a threaded section of the actuating cylinder, actuating screw, which is guided so that it can be screwed in and out, preferably at the end facing away from the channel serves. 14-. Clamping tool according to claim 13, characterized in that that the actuating piston facing the actuating screw Side serving as an intermediate piece between screw and piston, z. B. spherical cap-shaped projection wearing.