COUPLING DEVICE OF JIG

摘要

A coupling device of jigs includes a foundation, a tube, a plurality of balls, and a piston base. The foundation has a chamber, in which a part of the tube is inserted. The tube has a plurality of through holes for housing the balls. The piston base is received in the chamber, and fitted to the tube. An inner surface of the piston base has a circular groove and an abutment surface. The piston base can be moved along an axial direction of the tube between a first position and a second position. When at the first position, a part of each ball is inside the circular groove; when at the second position, an area where the abutment surface abuts against each ball is not merely a single point. Whereby, the force applied on the abutment surface is dispersed, and therefore the processing accuracy of workpieces is ensured.

主权项

1. A coupling device, comprising:
a foundation having a chamber therein and a perforation on a surface thereof and connecting to the chamber; a tube engaged with the perforation of the foundation, wherein the tube has a plurality of through holes; a plurality of balls, which are respectively movably provided in each of the through holes of the tube; and a piston base received in the chamber and fitted to an outer surface of the tube, wherein the piston base can be moved along an axial direction of the tube between a first position and a second position; the piston base has an inner surface facing the outer surface of the tube, and a circular groove is formed on the inner surface of the piston base; when the piston base is at the first position, a part of each of the balls is received in the circular groove; the inner surface of the piston base further includes a abutment surface, which abuts against each ball with an area when the piston base is at the second position.