| 摘要 |
PURPOSE:To apply a braking force to the motion of an object to reduce the generation of noise, which is appropriate to external force, by absorbing in discharging air through restriction orifices formed in a cylinder in accordance with the extension and retraction of a piston. CONSTITUTION:An adjusting space 10a is defined between an actuating piston 7 and an adjusting piston 8 coupled to a return spring 9, which are closely fitted in a cylinder 3 on one and the other end sides thereof, respectively. The cylinder 3 is formed therein with a first small hole 6a at a position where it is closed by the adjusting piston 8 and second and third holes 6b, 6c in the section corresponding to the adjusting space 10a. Upon extension or retraction of the actuating piston 7, the outside air and the adjusting space are communicat ed together through the small holes 6b, 6c to absorb or discharge air, and there- fore, a fluid resistance may be obtained, which offers a braking force. Further, when external force becomes larger, the adjusting piston 8 is displaced to decrease or increase the number of the small holes for communication, greately, thereby it is possible to obtain a braking force appropriate to the external force. |
