Patent ID: 6179100
Filing Date: 2001-01-30
Classification: E05C,F16F

Abstract:
A piston-cylinder unit comprising:a cylinder;a piston rod sealingly extending into said cylinder;a piston carried by said piston rod and dividing said cylinder into two working chambers;a working fluid in said working chambers;a fluid connection in said piston extending between said working chambers;a valve arrangement carried by said piston for blocking said fluid connection, said valve arrangement including at least first and second closing valves arranged in series and opening in sequence, each valve having a valve inflow side and a valve outflow side;said first closing valve includes a first valve-closing body which abuts in the opening direction against a retaining surface of a slide, which slide in turn is effectively connected with a second valve-closing body of said second closing valve so that an opening motion of the first valve-closing body is transferred to the second valve-closing body;a first throttle arrangement in the fluid flow path between the first and second closing valves, said first throttle arrangement producing a pressure reduction between the valve outflow side of the first closing valve towards the inflow side of the second closing valve, the effect of the first throttle arrangement decreasing as the opening of the first closing valve increases and as the pressurization of the second closing valve increases to the same extent on the valve inflow side, anda second throttle arrangement on the outflow side of the second closing valve.