Pneumatic cylinder with damping device

A pneumatic cylinder comprising a cylindrical body defining an elongated piston chamber having an inlet and outlet port for pressurized fluid, opening into the piston chamber at least one end thereof through an annular groove;

• a reciprocable piston member in said piston chamber having a piston rod;
• a closing member on the piston member for closing the fluid inlet and outlet port, a damping device comprising said closing member and a restricted flow path for discharging the pressurized fluid upon closure of the inlet and outlet port by said closing member and a restricted flow path for discharging the pressurized fluid upon closure of the the inlet and outlet port by said closing member, and guide means for frictionless guiding of the closing member which axially extends inside the piston chamber, the guide means comprising the piston rod or extension thereof, wherein said closing member is coaxially arranged and movably supported by a helical spring, in respect to the piston member, and in that said piston member comprises an open cavity at one end thereof to receive at least a portion of the closing member and helical support spring upon closure of the inlet and outlet port by said closure member during a final portion of the piston stroke;
• wherein the closing member comprises an annular shaped member coaxially movable in respect to the piston rod or extension thereof;
• and wherein the annular closing member comprises annular ribs facing the annular groove on a flat surface at the end of the piston chamber, to close the inlet-outlet port.