| 摘要 |
PROBLEM TO BE SOLVED: To reduce the power required for take-out/put-in of the plunger in the trunk of an injector and improve usability by setting a plunger ring of a prescribed shape at a devised mushroom-shaped top end of the plunger rod. SOLUTION: Injector 10 consists of tapering top end 24 that has hole 26 at the top end 22 of the trunk 20 at which hook 30 is formed around the base end 28. Inside the trunk 20, plunger rod 50 is put on as it can move through the trunk. The plunger rod 50 has mushroom-shaped top end 70 to which cylindrical axis 80 of which diameter is small is settled and that has cylindrical groove 86 at the center part. The top end 70 has cone-shaped head 90 that can move freely slidably through the inside wall 21 of the trunk inside the trunk 20. Cylindrical shoulder 94 is formed near end 84 of the cylindrical axis 80 to which plunger ring 40 is put. |
