Patent ID: 6533084
Filing Date: 2003-03-18
Classification: F16F

Abstract:
A gas spring device which forms a chamber which is filled with a gas at a pressure higher than the atmospheric pressure by closing both ends and includes a piston rod extended towards the inside and the outside of the chamber through on of the both ends of the chamber and a speed reducing device fixed to an end of the piston rod located in the inner side of the chamber to separate the chamber into two spaces through which the filled gas is slowly moved, where the speed reducing device includes an uneven piston, an under washer and an upper washer which make contact with upper and lower surfaces of the piston and a ring mounted to an annular recess formed between the piston and the under washer and having an outer peripheral surface adhered to the inner wall surface of a cylinder and an inner peripheral surface separated from the bottom surface of the annular recess, at least one cutting recess formed on the outer peripheral surface of the piston located between the ring and the upper washer, at least one concentric speed reducing passage formed on the upper and lower surface of the piston, and at least one axial recess penetrating the piston to connect the concentric speed reducing passage of the upper and lower surfaces of the piston.