| 摘要 |
PURPOSE:To make it possible to charge a gas additionally to lower cost by so retaining a control rod as to be capable of being pushed down inside a piston rod by a spring and simultaneously by forming a notch which functions as a gas passage between a control rod and a seal at the time of pushing down. CONSTITUTION:A control rod 13 is inserted into a hollow piston rod 12 and the control rod 13 is so retained as to be capable of being pushed down by providing a spring 16 at its lower end. On the other hand, a seal 14 between rods is formed at the upper end of the hollow section 12a of the hollow piston rod 12 and a notch 17 is formed at the upper end of the control rod 13. hereupon when the notch 17 pushed down the control rod 13 up to the position of a seal 15 between rods by connecting a gas charging device with the tip of the hollow piston rod 12, a gas can be charged into inside of a cylinder through a gas delta. Consequently additional charging of a gas, simplification of a work and cost down can be realized. |
