| 摘要 |
PURPOSE:To contrive improvement in strength of the title device by making a claw fitting into surface contact at a plurality of positions, by a method wherein the side of the pawl receiving torque at the time of a rotation of a valve body is tilted so that the side of the pawl is tapered extending to the tip from the root, and a wall surface of a recessed part of an opponent screw head confronted with the tilted side is tilted so that an inclination of the same becomes the same as that of the pawl and the same is tapered extending toward the interior from an insertion port. CONSTITUTION:A valve body 20 is made movable in an axial direction between a screw 11 and screw head 21. When the valve body 20 abuts against the screw head 21 by moving forward, its resin passage is opened, and when the same abuts against a spacer 14 fitted to the tip of the screw 11 by moving backward, its resin passage is closed. An end part on a screw head side of the valve body 20 is provided with a plurality of protrusions 22, recessed parts 23 corresponding to the protrusion 22 are provided on the screw head 21 and the protrusion 22 are fitted in the recessed parts 23. The screw 11 is revolved in a (b) direction and the side receiving torque through the screw head 21 is of an inclination where it is tapered extending to the tip from the root, in the respective protrusions 22. Also a side wall surface (c) of the recessed part 23 coming into contact with the protrusion 22 is in the same inclination as that, and the contact surface pressure can be lowered. |
