| 摘要 |
PURPOSE:To obtain an appropriate propulsive force with a simple structure by utilizing a spring torque and to make maintenance and inspection easy. CONSTITUTION:Propulsive force is preserved at a shaft part 13 by removing a cover 20 and forced-rotating the first shaft 11 in a winding direction of a power spring 16. As it rotates, a piston 18 slides. By preventing rotation of the power spring 16 in a winding down direction, putting back the cover 20, and engaging a stopper pin 21 in a slit groove 13a in a shaft part 13, the propulsive force can be preserved in the second shaft 18. The propulsive force is applied to the second shaft 18 when unlocking state is provided by pulling out the stopper pin 21. |
