| 摘要 |
PCT No. PCT/FI81/00040 Sec. 371 Date Jan. 11, 1982 Sec. 102(e) Date Jan. 11, 1982 PCT Filed May 28, 1981 PCT Pub. No. WO81/03527 PCT Pub. Date Dec. 10, 1981.A hydraulic piston cylinder device comprising a cylinder, a piston dividing the cylinder into two cylinder spaces (A and B), and valve members between the cylinder spaces and respective pressure medium pipes. The problem is to achieve a hydraulic piston cylinder device in which the pressure or tractive force of the cylinder is maintained even if the external pressure led into the cylinder would stop. To solve this problem, an elastic material is interposed between two piston parts, and is elastically compressible by the external pressure applied to the cylinder; and the valve members are coupled to each other so that when one of the valve members is closed the other cannot be closed. |
