JPH073907U - Claw for chuck - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is to provide a chuck claw capable of constantly and reliably grasping a workpiece without causing scratches or deformation. [Structure] A grip piece 17 having a slight elasticity is attached to a grasping surface portion 16/26 of a chuck claw 11/21 which is attached to the chuck body 1a / b to clamp and grasp a desired workpiece.
27 is attached. And claw 11.
Since the contact pieces 17 and 27 are elastically deformed by the tightening force of 21 and come into close contact with the outer peripheral surface of the workpiece, a large frictional force is generated between the contact pieces 17 and 27 and the workpiece, causing scratches and deformation. You can always grasp the workpiece safely and surely.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a chuck claw.

[0002]

[Prior art]

 The chuck is attached to the main shaft of the required machine tool such as a lathe, and it is rotated with the main shaft while tightening and grasping the work with the claws that are mounted radially, and the required rotation is given to the work. Generally, three chucks are provided. Generally, a three-jaw chuck having four tabs and a four-jaw chuck having four tabs are widely used. As the claw of the chuck, there is conventionally known a claw that is formed of a metal material and that has an anti-slip projection integrally formed on a grasping surface portion that grasps a workpiece.

[0003]

[Problems to be solved by the device]

 In the conventional chuck claw configured as described above, the anti-slip protrusion formed on the grasping surface portion can surely grasp a desired workpiece such as a metal pipe, but the anti-slip protrusion itself is made of metal. Since it is formed more, it has no elasticity at all. Therefore, when tightening and grasping the required work such as a metal pipe, there is a risk that the gripping point of the work may be scratched or deformed, and the tightening force of the claw may be insufficient. If it was sufficient, the work piece would spin and the protrusions on the grip surface would easily cause scratches.

This invention intends to solve all the conventional problems at once, and is a convenient chuck claw that can always grasp the workpiece safely and surely without causing scratches or deformation. To provide.

[0005]

[Means for Solving the Problems]

 That is, according to the invention, in the chuck claw which is mounted on the chuck body 1a, 1b to clamp and grasp a desired workpiece, the grasping surface portion 16.26 of the claw 11.21 has a slightly elastic contact piece 17. 27 is attached.

[0006]

[Action]

 The contact pieces 17 and 27 are elastically deformed by the tightening force of the claws 11 and 21, and are brought into close contact with the outer peripheral surface of the workpiece. For this reason, a large frictional force is generated between the elastically deformed contact pieces 17 and 27 and the work, and the work can always be grasped safely and surely without causing scratches or deformation.

[0007]

【Example】

 An embodiment of the present invention shown in the drawings will be described below. FIG. 1 shows a claw 11 showing a first embodiment of the present invention, in which 12 is a metal claw body having a rectangular cross section and having a required length, and 13 is a longitudinal direction of the claw body 12. A mounting groove formed on one side of the mounting groove 13, a selection portion 14 engraved at a predetermined pitch along the outer surface of both side edges of the mounting groove 13, and a mounting groove 15 on the other side of the claw body 12. Mounting holes formed at predetermined intervals toward the groove 13 side, 16 is a substantially trapezoidal grasping surface portion formed at one end of the claw body 12, and 17 is a required attachment surface along the grasping surface portion 16. It is a plate-shaped pad having a thickness. The corresponding piece 17 is made of a material having a slight elasticity, for example, a hard synthetic resin such as a hard urethane resin, a hard rubber having a JISA hardness of about 90, or a composite material similar to these. ing.

As shown in FIG. 2, the claw 11 configured as described above is radially mounted on the chuck body 1a to form the three-claw chuck 2a. Then, the three-jaw chuck 2a is set on a required machine tool such as a lathe, and when grasping the required workpiece, the respective claws 11 are interlocked with each other and moved toward the center of the chuck body 1a and tightened. Then, the contact piece 17 is elastically deformed by the tightening force of the claws 11 and is brought into close contact with the outer peripheral surface of the work piece, and a large frictional force is generated between the elastically deformed contact piece 17 and the work piece. Get to know it. At this time, since the abutting piece 17 comes into close contact with the outer peripheral surface of the work piece in an elastically deformed state, there is no possibility of causing scratches or deformation on the outer peripheral surface of the work piece.

FIG. 3 shows a claw 21 according to a second embodiment of the present invention, in which 22 is a claw body having a required length which is a flat and substantially rectangular rod-shaped body, and 23 is the claw body. The mounting ridges projectingly provided on one side surface along the longitudinal direction of 22 and 26 are grasping surface portions with planting grooves 24 formed on the other side surface along the longitudinal direction of the claw body 22 and 27 are An abutting piece having a slight elasticity, which is planted along the planting groove 24 of the grasping surface portion 26, and the outer surface of the corresponding piece 27 is a curved surface having a substantially V-shaped cross section. The contact piece 27 is made of the same material as the contact piece 17 of the first embodiment. Reference numeral 25 denotes a mounting screw hole formed from the side of the projection 23 of the claw body 22 toward the planting groove 24, and 28 is a positioning stopper formed upright at one end of the claw body 22.

As shown in FIG. 4, the claw main body 21 configured as described above is attached to a required chuck body 1b through a holder -3b to form a three-claw chuck 2b, which is mainly a handy type. Set it on a machine tool for use. When grasping a desired work such as a metal pipe, each claw 21 is moved in the direction of the center of the chuck body 1b via the holder -3b and tightened as in the first embodiment. The elastic piece 27 is brought into close contact with the outer peripheral surface of the work piece so that it can be grasped safely and reliably.

Although the first and second embodiments show the three-jaw chuck claws 11 and 21, the present invention is not limited to this, and the four-claw chuck and other chuck claws are not limited thereto. It can be applied. Further, although the contact pieces 17 and 27 are attached over the entire surface of the grasping surface portions 16 and 26, they may be attached partially, and the attachment is also performed by a known attachment means such as adhesion, attachment, or planting. It is something that can be done.

[0012]

[Effect of device]

 According to the present invention, since the gripping surface portions 16 and 26 of the claws 11 and 21 are provided with the abutting pieces 17 and 27 having a little elasticity according to the above, the claws can be grasped when grasping a desired workpiece. Due to the tightening force of 11 ・ 21, the contact pieces 17 ・ 27 elastically deform and come into close contact with the outer peripheral surface of the workpiece, causing a large frictional force between the contact pieces 17 ・ 27 and the workpiece, which may cause scratches or deformation. It is possible to always grasp the workpiece safely and accurately without causing it to occur. In addition, even when the work piece idles due to insufficient tightening force of the claws 11 and 21, the contact pieces 17 and 27 are elastically deformed and are in contact with the outer peripheral surface of the work piece, so that idle scratches are generated as in the past. There is no fear.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a front view showing the same usage state.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a front view showing the same usage state.

[Explanation of symbols]

 1a ・ 1b Chuck body 2a ・ 2b Chuck 11 ・ 21 Claw 12 ・ 22 Claw body 16 ・ 26 Grasping surface part 17 ・ 27 Abutment piece

Claims (1)

[Scope of utility model registration request] 1. A chuck tab for mounting on a chuck body 1a, 1b to clamp and grip a desired work piece. In the grip surface portion 16, 26 of the tab 11, 21, a slightly elastic contact piece 17, 27 is provided. A chuck claw characterized by being attached.