JPS58149106A - Tensioning device chuck - Google Patents

Abstract

PURPOSE:To easily grip a material with the use of a chuck in a tension applying device without harmful deformation being brought about in the longitudinal direction of the material. CONSTITUTION:When a cylindrical rotary body 13 is rotated in its circumferential direction, a pawl 4 attached to a housing 12 is moved in the direction perpendicular to the direction longitudinal of a material 8. When the rotary body 13 is rotated in such a direction that the housing 12 is moved in the direction of the arrow (a), the pawl 4 is moved in the direction in which the pawl 4 grips the material 8, but when the rotary body 13 is rotated in the reverse direction, the pawl 4 is moved in the direction in which the pawl 4 releases the material 8. That is, the direction of the rotation of the rotary body 13 determines the movement of the pawl 4 for loading or unloading the material 8 without the pawl 4 being moved in the direction in which compressing or pulling force is exerted in the longitudinal direction of the material 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chuck for a tensioning device for applying tension to materials.

Figure 1 shows an example of a conventional chuck, in which the chuck body IK is attached to the light leak of the tension applying device 7, and the block 2 that makes the slope surface M is fixed by a key 3 and a tightening screw (not shown). has been done.

In another example, the chuck body 1 and the block 2 are formed of one rigid body (not shown). However, in any case, the result is a chuck body that has sloped surfaces that face each other, with the side where the distance between the sloped surfaces is smaller being the mouth side.

In Figure #I1, the nine claws 4 that are movably attached along the sloped surface of the block 2 have their retaining portions provided on the back sloped surface jj in the retaining grooves provided on the sloped surface of the block 2. When engaged, the block 2 can move only along the sloped surface. The metal fitting 5 is for moving the pawl 4, and in the illustrated example, it is built into the chuck body 1 and fixed to the tip of a rod 6 of a hydraulic cylinder.
However, in other examples, a link mechanism is applied to move the pawl 4.

In any case, in the conventional chuck, when the position of the claws 4 is moved relative to the longitudinal direction of the material 8, the planes of the pair of claws 4 facing each other are adjusted to the slope of the back surface of the claws 4. This is a method of gripping the material 8 in a wedge shape.

The general method of using this chuck is to use two chucks as shown in the figure, place them oppositely on both ends of the material 8 in the longitudinal direction, grip both ends of the material 8 with the respective chucks, and move the material 8 in a pattern. By moving one or both of the opposing chucks in a direction away from the longitudinal center of the material 81, a tensile force or deformation is applied to the material 8 in the longitudinal direction.

In this case, as shown in FIG. 1, if the surface increase of the material 8 and the gap tO value of the chuck moving fitting are set too small,
When pushing the gold ^5 forward with the rod 6 of the cylinder, before the parallel surface of the claw 4 and the longitudinal plane of the material 8 come into contact, the end surface of the material 8 and the surface of the gold JA, 5 come into contact, and the material 8 Press in the L direction.

If the other layer of the material 8 is already fixed by another chuck, if the force pushing out the rod 6 of the cylinder is large enough, the material 8 will be shortened by Δt in the longitudinal direction, and the metal fittings of the material 8 will be compressed by Δt. When the amount of Δt becomes large, compressive force acts on the material 8 in the longitudinal direction, causing deformation such as buckling or bending that is harmful to processing. If the force for pushing out the cylinder rondro is small compared to the longitudinal rigidity of the material 8, the gap t is 0.
In this state, the movement of the chuck stops and the material 8 cannot be gripped. Furthermore, if the cap t is too large, sufficient gripping margin will not be obtained, resulting in the material 8 coming off from the chuck when a tensile force is applied. In any case - 1. It is necessary to be very careful when operating this virtue chuck, and when handling long materials such as in tension bending forming processing, it is necessary to accurately determine the position of the chuck and the end surface of the material. This is difficult and can lead to decreased work efficiency.

An object of the present invention is to provide a chuck for a tensioning device that can grip a material without generating compressive force in the longitudinal direction of the material.

The feature of the present invention is that by moving the claws only in the direction perpendicular to the longitudinal direction of the material, deformation in the longitudinal direction of the material is caused that is harmful to the understanding of material property values in tensile r*ge forming processing or tensile tests. The reason is that it has a structure that allows you to grasp it without giving it away.

One implementation of the present invention will be described below with reference to FIGS. 2 and 3.

In FIGS. 2 and 3, a rod-shaped guide 10 for regulating the direction of movement of the housing 12 and a gold alloy for regulating the direction of movement of the claws 4 are attached to the front surface of a chuck body 9, which is the base portion of the chuck.
- On the inner sloped surface of the housing 12, the retaining portion of the pair of claws 4 on the rear sloped surface engages with a casualty engagement groove provided on the inner sloped surface of the housing 12, so that the housing 12 and the claws 4 are engaged with each other.
It is installed with the sloped surface of the Further, an L-shaped retaining portion provided at the rear end of the claw 4 engages with the metal fitting 11 to restrict the direction of movement of the claw. The housing 12 is fitted onto the rod-shaped guide member 10 and mounted on the chuck body 9 in such a manner that its direction of movement is restricted. Cylindrical rotating body 13
is rotatably attached to the chuck body 9 with its inner diameter stepped portion fitted into the outer diameter of the chuck body 9 and its inner diameter threaded portion engaged with the outer diameter threaded portion of the housing 12 . When the cylindrical rotating body 13 is rotated in the same direction in the state shown in FIG. Mounted on the inside and running claw 4
moves in a direction perpendicular to the longitudinal direction of the material 8. If the cylindrical rotating body 13 is rotated in a direction that moves the housing 12 in the direction of the arrow, the claws 4 will move in the direction of gripping the material 8, and if the cylindrical rotating body 13 is rotated in the opposite direction, the claws will move in the direction of gripping the material 8. 4 moves in the direction of releasing the material. The claw 4 moves only in a direction perpendicular to the longitudinal direction of the material 8 due to the rotation of the cylindrical rotating body 13, and is directed in a direction that applies compressive force or pulling force to the longitudinal direction of the material 8. Materials can be attached and detached without moving them. For this reason, when grasping both ends of the material, pull! It can be easily grasped without causing any harmful deformation to the material during the forming process or understanding the material properties in tensile tests. The method for rotating the cylindrical rotating body 13 is not limited to the method shown in the drawings, but may also be a method using power.

As detailed above, according to the present invention, a harmful deforming force is applied in the longitudinal direction of the material.
o <, volume, damage the material. □Dankai Zhangka.

A device chuck can be provided.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of a conventional chuck device, [2
The figure is a sectional view showing a chuck device according to an embodiment of the present invention, and FIG. 3 is a partially sectional exploded perspective view illustrating the component configuration of FIG. 2. 4...Claw, 9...Chick body, 10...Bar-shaped guide, 11...Metal fitting, 12...Housing, 1
3...Cylindrical rod 1 diagram V2 diagram B

Claims (1)

[Claims] 1. A chuck body, a sloped surface, and an engagement groove along the sloped surface; a pair of blocks that are attached to the chuck body with the sloped surfaces facing each other and the smaller distance between the opposing surfaces facing toward the opening; and a retaining part that engages along the slope surface of the block and the groove of the block on the back side, a plane parallel to the surface of the material, and L on the rear side.
A pair of claws that are relatively movably attached along the sloped surface of the block with the planes facing each other after the L-shaped retaining part, and a metal fitting that engages with the L-shaped retaining part of the claws. In the chuck body, the chuck body has a metal fitting that engages with the L-shaped retaining portion of the claw with a certain gap on the front end surface and a disk portion on which a rod-shaped guide body is attached; A cylindrical rotating body having a threaded portion, an inner diameter portion that fits with the outer diameter of the disk portion of the chuck body, and a stepped portion with an inner diameter smaller than this inner diameter, and the block is provided with a pair of opposing a slanted surface, a nine engaging screw attached to the slanted surface, and a hole or groove that fits into the rod-shaped guide attached to the chuck body, and the outer periphery thereof engages with the inner diameter threaded portion of the cylindrical rotating body. A chuck for a tension applying device, characterized in that it is formed of a housing having a threaded portion.