Gas compression spring of blockable type - has axially displaceable control member associated with closing valve

摘要

The gas compression spring has a cylinder (1) and working-piston (17). A valve (28,29) provided at the port (41) of the working piston has a movable control member by which the valve can be moved into its open position independently of the setting movement of the operating member. The control member is designed as a free piston (29) axially displaceable in the working piston. The front piston face of the free poston, is exposed to the pressure gas on the piston side (27) remote from the piston rod (9), and the other piston side (23). The force of a pretension interacting with the free poston forces the free piston into an axial position corresponding to the closing position of the valve. ADVANTAGE - When necessary, the piston rod and working piston can move without having to open the valve by the operating member.