公开(公告)号：US3905278A

公开(公告)日：1975-09-16

申请号：US44586774

申请日：1974-02-26

Applicant: POCLAIN SA

Inventor： OURDOUILLIE ANDRE P

IPC: F15B11/08 ,  F15B15/14 ,  F15B15/22 ,  F16J15/00

CPC classification number: F16J15/006 ,  F15B15/222 ,  F15B15/227

Abstract: A jack having a cylinder, a piston in the cylinder and a piston rod attached to the piston, the periphery of the piston including a recess defined by two shoulders facing one another, a pair of rings surrounding the piston in the recessed part thereof, biased axially apart and limited in their axial separation by the shoulders, a duct connecting the space between the rings to a source of fluid through the piston rod, the duct including a nonreturn valve whereby fluid may be fed to the space between the rings.

Abstract translation: 具有圆柱体，气缸中的活塞和附接到活塞的活塞杆的千斤顶，活塞的周边包括由彼此面对的两个肩部限定的凹部，在其凹部中围绕活塞的一对环，偏置 轴向分开并且通过肩部轴向间隔限制，将环之间的空间连接到通过活塞杆的流体源的管道，该管道包括止回阀，由此可以将流体供给到环之间的空间。