| 摘要 |
<p>PROBLEM TO BE SOLVED: To communicate an internal space of a stopper with a pressure chamber with excellent yield of a material in a process for forming the stopper arranged in the pressure chamber between a primary piston and a secondary piston without easy change in the diameter of a front end part of the stopper. SOLUTION: A collar 39 of the stopper 27 arranged in the pressure chamber 23 between the primary piston 19 and the secondary piston 18 is formed into a flat disc shape. The internal space 45 of the stopper 27 is communicated with the pressure chamber 23 by a plurality of passing holes 40 formed on the collar 39, a plurality of recessed parts 41 formed on a rear end face of the secondary piston 18 to be communicated with the passing holes 40, and a plurality of passages 46 formed between an outer periphery of a guide projection 38 and an inner periphery of the front end part of the stopper 27 by a plurality of cut-outs provided on the outer periphery of the guide projection 38 of the secondary piston 18 to communicate the recessed parts 41 with the internal space 45 of the stopper 27.</p> |
