| 摘要 |
<p>PROBLEM TO BE SOLVED: To enhance the reliability upon coupling by a method wherein a joint member 18 made of a synthetic resin to form a cylindrical part forcibly inserted into the outer peripheral part in outer end part of a movable core so that a pawl engaging with the outer peripheral surface of the movable core may be integrally formed in this cylindrical part. SOLUTION: A synthetic resin joint member 24 is composed of a cylindrical part 24a on one end and an eye-ball part 24c protruding from the endwall 24b of the cylindrical part 24a so that the cylindrical part 24a may be forcibly inserted into the outer peripheral surface of the outer end of a movable core 6 to connect a work member 26 to the eye-ball part 24c. Besides, a plurality of lateral holes 27 and an engaging pawl 28 bending the front end pawl part facing to the lateral holes 27 inward in the radial direction are integrally molded in the cylindrical part 24a. This engaging pawl 28 is engaged with the outer peripheral circular trench 29 of the movable core 6 by the self elasticity when the outer end of the movable core 6 forcibly inserted into the cylindrical part 24a abuts against the end wall 24b. Accordingly, even if the pressure coupling between the cylindrical core 6 and the movable core 6 happens to be loosened, the release of the joint member 24 can be avoided.</p> |
