Spring devices – Vehicle – Comprising compressible fluid
Patent
1996-04-12
1998-07-07
Butler, Douglas C.
Spring devices
Vehicle
Comprising compressible fluid
188317, 18832219, 267 6426, 267124, 267 6425, F16F 902, F16F 936, F16F 500
Patent
active
057756775
ABSTRACT:
An air or gas sprung and dampened shock absorber for a bicycle is set forth comprising a cylinder having a closed end and an open end forming a compression chamber, a shaft having a closed end and an open end, the open end of the shaft being reciprocally received within the cylinder through the open end of the cylinder, a piston sealingly positioned in the open end of the shaft and slidably and sealingly positioned adjacent an inner surface of the cylinder forming a rebound chamber in the shaft and a gas spring chamber formed between an outer surface of the shaft and an inner surface of the cylinder wherein the gas spring chamber communicates with the rebound chamber during at least a portion of the compression and rebound stroke of the shock absorber. The shock absorber further includes a compression plate sealingly received in the shaft with an axial position of the compression plate being selectively moveable within the shaft for varying a total volume of the shock absorber. Alternatively, an air or gas sprung and dampened shock absorber for a bicycle may comprise a first chamber having a first closed end and a second open end, a second chamber having a closed first end and a second end sealingly and reciprocally received in the first chamber with the second end including a piston sealingly secured thereto is set forth. The piston includes at least one valved passage which permits the flow of gas pressure from the first chamber to the second chamber and a return orifice which restrictively permits at least the flow of gas pressure from the second chamber to the first chamber with the first and second chambers, the valved passage and the return orifice being sized such that upon compression of the shock absorber from an initial position, forces acting on the piston in the first chamber are substantially greater than forces acting on the piston in the second chamber to spring the piston back towards the initial position.
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Butler Douglas C.
Safran David S.
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