Fluid filled spring damper including flexible end wall

Claim 1

A damper comprising a cylinder having an open end at one end; a cap member fitted to the open end of the cylinder to permit an operational medium to be sealed in a liquid-tight fashion into the interior of the cylinder, said cap member including an outer cylindrical metal member screwed into the open end of the cylinder, an inner cylindrical metal member having an inner bore provided at the axial direction thereof, and a flexible member secured between the inner and outer cylindrical metal members; a piston disposed within the cylinder to be movable in the axial direction of the cylinder and normally positioned in an initial position; a piston rod slidably inserted through said inner bore of the inner cylindrical metal member to be movable in the axial direction of the cylinder and secured at one end to the piston; and an orifice means for imparting a fluid resistance of the operational medium as a reaction force to the piston when the piston is moved from the initial position in accordance with the sliding movement of the piston rod, said flexible member being adapted to be resiliently deformed outward in the axial direction of the cylinder to permit the inner cylindrical metal member to be displaced outward due to the operational medium in the cylinder being subjected to increased pressure as the piston rod is forced more inwardly into the cylinder, and in consequece the piston is moved from the initial position, whereby increase in the pressure of the operational medium is controlled.