DE202005003837U1 - Tool clamping device, comprising two rings with insertion areas for extensions located at key - Google Patents

Abstract

The tool clamping unit is provided with an opening at the front for the insertion of the rear end of the tool shaft. A cylindrical extension is divided in a segment adjacent to the main part (1) with holes (2) positioned around its surface and a front segment with an outer thread to be joined to the inner thread located at a clamping nut (3) provided with several axial slots (4). Two small cylindrical extensions protruding from the lower surface of the key (6) can be inserted in a pair formed by a hole (2) and a slot (4) and the nut (3) and the main body (1) rotated in relation to each other.

Description

The The invention relates to a system for tensioning the clamping nut of a Tool holder for tools according to the preamble of claim 1.

Around To include tools in tool holders, often clamping nuts used directly or indirectly a tool in the tool holder tighten. It is necessary, the clamping nut on the tool holder to twist and realize the tension under high torques.

In As a rule, wrenches are used. The known Spannschlüssel In doing so, they directly engage the clamping nut and use corresponding ones Shots like grooves and two-ply. To absorb the torque to be able to The tool holders are otherwise in corresponding adapters held or secured against rotation.

More difficult It will, if the tool holder itself no own support against can apply the torque (eg as a rotating spindle in driven tools) or if the external forces necessary for the tensioning Overload tool holder mechanically would. In both cases will be with a second key held against, but this second key then but on the tool holder attacks.

From that Based on the object of the invention, a simple System for clamping the clamping nut of a tool holder for tools to accomplish.

The technical solution is characterized by the features in the characterizing part of claim 1.

Thereby is a clamping system for created the clamping nut of a tool holder for tools, which with the simplest means an adaptation to different geometries and installation conditions And at the same time the closure of the Power circuit allows so no further aids are necessary to the clamping nut for tool holder to tense. The tool holder has at least one receptacle for one the pin and the clamping nut at least one receptacle for the second Spigot of the Spannschlüssels. By turning the clamping key the torque is in a couple of forces converted, on the one hand on the tool holder and the other supported on the clamping nut. The forces introduced here in turn generate a torque about the axis of the thread between the tool holder and the clamping nut. This torque provides in connection with the thread for an axial displacement and thus an axial tension of the clamping nut for Tool holder. Thereby can Components extending in the axial direction between the clamping nut and the tool holder are clamped. The tensioning system according to the invention is also suitable for clamping collet connections according to DIN 6499 or similar Systems. It only has to the clamping nut and a portion of the tool holder geometric customized become. Due to the function of the conical collet, the axial Displacement converted into a radial displacement, and it can be stretched with radial force. By the constructively very small executable Distance between the pins with a correspondingly small lever arm compared to the relatively larger thread diameter, where the radius corresponds to the lever arm, you get beyond a power boost by at least a factor of 2. This has the further for the user Advantage that the clearly applied forces can be reduced. Because no second, separate key is necessary to counter, the handling is for the user a significantly simplified and on the other hand, the risk of injury by slipping keys reduced.

Preferably are in accordance with the training in Claim 2, the pins each cylindrical.

In a first variant according to claim 3 can arranged the pin on the front side of an elongate body be. This body is preferably cylindrical. He can also be polygonal (including square). The Spannschlüssel consists of the main body, on which the two pins are attached.

Around to be able to apply the necessary torque to the body, suggests the training according to claim 4 a transverse operating lever in front. It can be a cross pin or an external polygon or comparable elements. The operating lever can be fixed at the base body be arranged. But it is also conceivable that the actuating lever in a corresponding Bore is inserted at the upper end of the body.

A second variant of the operating key proposes according to claim 5, that the two pins are arranged on the two scissor arms of a fork. The two scissor arms carry at their outer ends in each case a pin, perpendicular to the plane of the two scissor arms. The necessary torque can be generated by turning the wrench. If the scissor arms are adjustable, the pin distance can be adjusted via the scissor action of the fork. If the scissor arms, however, are fixed and thus the pin distance is fixed, which is a recess as a support, for example in the form of an elongated hole, slot, etc. form.

The Training according to claim 6 beats constructive training of the two recesses before. The centering Recording for the pin can be formed, for example, as a cylindrical bore be. The pure support Can be used as a slot, slot, hole with a significantly larger diameter be designed as the pin diameter, etc.

The Training according to claim 7 beats a radial handling of the clamping system with clamping nuts with internal thread before, while the development according to claim Figure 8 shows an axial handling of the clamping system with externally threaded locknuts suggests. Operating principle and advantages are identical for both variants. Of course it is in both variants not just a single recess in the clamping nut or provided at the tool holder, but it is respectively a wreath of recesses provided so as to be the cheapest Position the wrench to be able to.

Five embodiments the clamping system according to the invention will be described below with reference to the drawings. In these shows:

1a the first clamping system in a perspective view;

1b a side view of the clamping system in 1a ;

1c a perspective view of the Spannschlüssel from below;

2a to c a second embodiment of the clamping system with representations corresponding to those in 1a to c ;

3a to c a third embodiment of the clamping system with representations corresponding to those in 1a to c ;

4a to c a fourth embodiment of the clamping system with representations corresponding to those in 1a to c ;

5a and b a fifth embodiment of the clamping system with representations corresponding to those in 1 ,

The first embodiment of the clamping system in 1a to c has a tool holder 1 on, on a frontal, fixed ring cylindrical recesses 2 having.

On a cylindrical extension, not shown, with external thread of the tool holder 1 is a clamping nut 3 screwed on with internal thread. This clamping nut 3 has recesses distributed around the circumference 4 in the form of longitudinal grooves.

Furthermore, a Spannschlüssel 5 intended. This has a cylindrical body 6 , At the lower end there are two pins 7 , At the upper end, the body 6 an operating lever 8th on.

The How it works is as follows:

The Spannschlüssel 5 will with his two cones 7 in the two recesses 2 . 4 used. Because the recesses 2 . 4 in an unequal division ratio around the circumference of the tool holder 1 or the clamping nut 3 are arranged, can always be a recess pair 2 . 4 find, in which the Spannschlüssel 5 can be used easily. By turning the clamping key 5 becomes the clamping nut 3 opposite the fixed tool holder 1 rotated and thus stretched the tool, not shown.

The embodiment in 2a to c differs from the first embodiment in that the recesses 2 in the tool holder 1 are formed as longitudinal grooves, while the recesses 4 in the clamping nut 3 are designed as cylinder bores. The functioning as such is identical.

In the embodiment in 3a to c are the recesses 4 in the clamping nut 3 designed as cylinder bores, the inner diameter of the outer diameter of the corresponding pin 7 of the clamping key 5 equivalent. The recesses 2 the tool holder 1 are also designed as cylinder bores, but with a larger diameter than the pin diameter.

The variant in 4a to c has the recesses 2 . 4 not in the radial peripheral region of the tool holder 1 and the clamping nut 3 on, but the recesses 2 . 4 are frontally formed as cylinder bores, wherein the recesses of the tool holder have a larger diameter than the corresponding pin diameter, or vice versa. As can be seen, these clamping nuts 3 are clamping nuts with an external thread.

The variant in 5a and b shows a spanner 5 in the form of a fork with two swivel arms 9 , at the front ends of the pins 7 are arranged. By pivoting the scissor arms, the distance between the pins 7 be set. Again, the operation of the basic principle is identical to the previous embodiments.

1

tool holder

2

recess

3

locknut

4

recess

5

tightening wrenches

6

body

7

spigot

8th

actuating lever

9

scissor arms

Claims (8)

System for tensioning the clamping nut ( 3 ) a tool holder ( 1 ) for tools, with a spanner ( 5 ), which on the clamping nut ( 3 ) and this relative to the tool holder ( 1 ), characterized in that the spanner ( 5 ) two parallel pins ( 7 ), that the clamping nut ( 3 ) at least one of the first pin ( 7 ) of the clamping key ( 5 ) associated first recess ( 4 ), that the tool holder ( 1 ) at least one the second pin ( 7 ) of the clamping key ( 5 ) associated second recess ( 2 ) and that when inserted pins ( 7 ) into the recesses ( 2 . 4 ) by turning the clamping key ( 5 ) the clamping nut ( 3 ) and the tool holder ( 1 ) are rotatable relative to each other. System according to the preceding claim; characterized in that the pins ( 7 ) are each cylindrical. System according to claim 1 or 2, characterized in that the pins ( 7 ) on the front side of an elongated body ( 6 ) are arranged. System according to claim 3, characterized in that the basic body ( 6 ) at which with respect to the pins ( 7 ) at the other end a transverse operating lever ( 8th ) having. System according to claim 1 or 2, characterized in that the pins ( 7 ) on two scissor arms ( 9 ) are arranged a fork. System according to one of the preceding claims, characterized in that the first recess ( 2 respectively. 4 ) for the first pin ( 7 ) as a centering receptacle and the second recess ( 4 respectively. 2 ) as a support for the second pin ( 7 ) is trained. System according to one of claims 1 to 6, characterized in that the recesses ( 2 . 4 ) on the cylindrical peripheral surface of both the clamping nut ( 3 ) as well as the tool holder ( 1 ) are arranged. System according to one of claims 1 to 6, characterized in that the recesses ( 2 . 4 ) on the face of concentric rings of both the clamping nut ( 8th ) as well as the tool holder ( 1 ) are arranged.