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US 2002/0162714 A1Published application
Gas spring device
AssigneeSamhongsa Co., Ltd.
InventorDong Kwan Ma
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AssigneeSamhongsa Co., Ltd.
InventorDong Kwan Ma
Estimating the term…
The present invention relates a speed reducing device of a gas spring device, and it is an object of the present invention to improve the structure of a piston which is an element of the speed reducing device, thereby to improve the shielding preciseness of a gas moving passage and to easily manufacture the piston. The piston according to the present invention is slidably moved in the cylinder in the state the piston is adhered to the inner wall surface 110a of the cylinder, and a cutting recess is formed on the outer peripheral surface of the cylinder to easily move the gas in first and second chambers. A concentric gas passage is formed on the surface of the piston which makes contact with the upper washer, and includes another concentric gas passage. An inlet and outlet of the gas passage is opened towards the outer peripheral surface of the piston. A concentric gas passage is formed on the surface of the piston which makes contact with the under washer. The inlet and outlet of the gas passage is opened towards the bottom surface of an annular recess. The gas passage is connected by an axial recess which penetrates the piston. If a Teflon ring shields the cutting recess, since the gas is slowly moved in the first chamber and the second chamber, the piston rod is slowly moved. If the Teflon ring opens a cutting recess, since the gas is moved fast in the first chamber 119a and the second chamber 119b through the cutting recess 128 and the gas passage 108c and 108d, the piston rod 111 is moved fast.
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 though one 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, wherein 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 Teflon 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 the 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 Teflon ring and the upper washer, at least one speed reducing gas passage formed on the upper and lower surface of the piston, and at least one axial recess penetrating the piston so that the gas passage of the upper and lower surfaces of the piston.
Dependencies are inferred from the claim text.