Gas spring used as e.g. lifting aid for hinged cover of vehicle

摘要

The gas spring encompasses a cylinder (5) is which a piston rod (17) is located so as to be movable axially. The cylinder contains a gas which provides an opposing force against the movement of the piston and restricts the speed or draw of the piston rod. A breaking unit is activated when the external force on the rod exceeds the maximum speed of draw of the rod, so as to limit the displacement to a required rate. A piston (17) is attached to the piston rod so as to divide the cylinder into two working chambers (19,21) connected together buy at least one flow passage (23). The passage (s) are partly closed when the back pressure causes the piston to move at more than the specified rate.