EP0730505A1

EP0730505A1 - Multiple spring chuck for machines

Info

Publication number: EP0730505A1
Application number: EP95901578A
Authority: EP
Inventors: Gaston Perret-Gentil
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-20
Filing date: 1994-12-13
Publication date: 1996-09-11
Also published as: CH685234A5; AU1075995A; WO1995029028A1

Abstract

A multiple spring chuck for machines, mainly comprising a resilient holder (1) mountable to a control member (8) of a machine and combined with additional clamping portions (2) for integrally transmitting the contraction of all the inner components of the resilient holder by direct contact.

Description

Multiple collet for machines.

Elastic clamps are known for machines which generally have a single clamping diameter or whose clamping opening is divided by a number of successive bearings of decreasing diameters towards the rear of the clamp. These pliers have the following disadvantages: 1) When they have only one clamping diameter, make it imperative that they be dismantled from the machine for any change in diameter. 2) When they have several successive clamping diameters, not to clamp at its front face only for the largest diameter and thus to limit the length and the clamping efficiency of the part. 3) To be forced, for clamping narrow parts, such as washers, on a diameter less than the largest, to perform mechanical operations inside the openings, with the drawbacks that this entails. The purpose of the invention is to overcome these drawbacks. To this end, the multiple clamping device is arranged as defined by the claims. Two embodiments of the collet object of the present invention will be described by way of example in the accompanying drawing, in which FIG. 1 is an axial section, along A-A, of FIG. 2, fig. 2 a front view of FIG. 1, fig. 3 a partial axial section, according to B-B, of FIG. > of the other embodiment and fig. a front view of fig. 3 "

This description which begins with the variant shown in fig. 1 and fig. 2, comprises an elastic clamp 1 mounted in the housing 9 (fig. 1) of a machine which causes, by a displacement along the arrow T of its clamping command, a compression of the clamp 1 against the conical surface 10 of a support 7 fixed on the machine resulting in a contraction of the opening of the clamp. The clamp 1 (fig. 1 and 2) is made elastic by three slots 11, 11a, 11b, which extend over its entire conical part in contact with its surface 10. In the opening of the clamp 1 is mounted a device. tightening sitive in two parts 2 and 15 (fig. 2) whose outside diameters are equal and in contact with the interior diameters of the "oince" in order to transmit the same contraction on the inner diameter of said device held in place by split rings such as 3 or 5 (fig “1 and 2) cooperating with said inner diameters, the position of the ring 5 shown e being a variant to that of the position for example. The internal diameter of the device is intended to carry the part to be clamped, not shown.

The two parts 2 and 15 (fig. 2) are cut entirely from one another by the slots 13 and 1 + and joined again by said rings split in one place by their openings 12 and 0 for example, the outer diameter of the rings being adjusted inside the devices 2 and 15 (fig. 1 and 2) by a recess, in order to make the two parts 2 and 15 integral by realizing the continuity of their common contact diameter. The ring 5 housed in its recess 6 (fig. 1 and 2) being in abutment and maintained on its outside diameter, for example using a screw not shown. The use of an elastic material for the rings favors the assembly and disassembly of the clamping device in the elastic clamp. In the second embodiment of the invention referring to Figs. 3 and L., the elastic clamp 20 has a single cylindrical opening intended to receive the clamping device 21 (fig. 3), the two parts of which are joined in the same way as in the first embodiment described, for example with the fen¬ due rings 26 and 27. The device 21 is intended either to carry a part to be tightened, or to receive a device 22 joined by the rings 25 and 28, said device being capable of carrying a part this in the same way to clamp or receive a device 23 joined by the rings 24 and 29, said device being able either to be the last or to receive others.

It is also possible to provide a clamping opening, for the part, different from the cylindrical shape, for example a square or hexagonal shape.

Claims

1) Multiple clamp for machines, consisting of an elastic support provided with transmission means capable of clamping a number of parts of different size and shape, by connection of the elastic support to the control 8 of a machine, charac ¬ terized in that the elastic support is associated with several additional clamping devices mounted simultaneously or separately and cooperating together, capable of fully transmitting, over their entire length, the same contraction caused in the opening of the elastic support until the contact surface between the diamèt¬ res of the smallest clamping device in place and that of the part to be fixed which it carries.

2) Multiple clamp according to claim 1, characterized in that the clamping device mounted in the elastic support bears in said support by an outer part consisting of one or more continuous cylindrical portions concent¬ eric with each other, respectively parallel to the contact surface of the connecting elements which hold them.

3) Collet according to claim 2, characterized in that said continuous cylindrical portions consist of a single diameter each over all their lengths. k) Multiple collet according to claim 2, characterized in that said assembly elements are rings having the same rectangular section at all points.

5) Multiple clamp according to claim il., Characterized in that said rings are interrupted at one place around their perimeter.