| 摘要 |
<p>A fluid pressure actuated piston having an outer piston member and an inner piston member slidable therein which pistons have equivalent areas exposed to said fluid pressure and are sequentially pressurized thereby providing extended piston travel. The outer piston is operatively connected to a normally closed fluid vent which is opened to vent the pressurized fluid to the inner piston substantially simultaneously with engagement of the outer piston with a fixed stop whereupon the inner piston continues to move.</p> |
