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US5088705A Expired / Lapsed US ⏱️ 0.0 years remaining

Bicycle shock-absorbing apparatus

Assignee: Dan Ken Industrial Co Ltd
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Filing: 1991-04-05
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Granted: 1992-02-18
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Expires: 2011-04-05
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Abstract

Abstract A bicycle shock-absorbing apparatus comprises an inner tube and an outer tube. The inner tube is inserted into the outer tube. An upper spring socket and a lower spring socket are disposed in the inner tube and the outer tube separately. A compression spring is disposed between the spring sockets, oil being filled between the spring sockets. The inner tube is fixedly attached to the upper spring socket and corelatedly actuated with the spring to achieve a shock absorbing effect. A hole is formed in the center of the upper spring socket, enabling oil to flow therethrough. An oil seal is disposed inside the top of the outer tube to prevent oil spillage. An air inlet socket is attached inside an upper wall of the inner tube, while an air inlet valve is received by the air inlet socket to enable inflation of the inner tube. The air, in cooperation with the spring and the oil, provide elasticity for the bicycle shock-absorbing apparatus.

Inventors

  • 👤 Chin S. Tsai

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 09:20
CPC Classifications
F; F16; F16F; F16F13/00; B; B62; B62K; B62K25/00; B62K25/04; B62K25/06; B62K25/08

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 237 words
A bicycle shock absorbing apparatus including an inner tube and an outer tube, said inner tube being inserted into said outer tube and said outer tube being filled with oil, the improvement comprising: an annular protrusion protruding inward from an inner surface of a lower portion of said inner tube; an upper spring socket being disposed inside a lower portion of said inner tube, having an annular groove therein for accommodating said protrusion of said inner tube, thereby fixing said inner tube to said upper spring socket; a lower spring socket being disposed inside a lower portion of said outer tube; a compression spring being disposed between said upper spring socket and said lower spring socket, an upper end of said compression spring being mounted on said upper spring socket, and a lower end of said compression spring being mounted on said lower spring socket, thereby engaging and corelatedly actuating said spring with said inner tube; a hole being formed in the middle of said upper spring socket for enabling oil to flow therethrough; an oil seal being disposed at a top of said outer tube for preventing the spillage of oil; an air inlet socket and an air inlet valve being located at an upper wall of said inner tube for inflating air therein; and a pressure meter being disposed at a top portion of said inner tube for showing air pressure inside said inner tube.
Claim 2
Dependent Claim 237 words
A bicycle shock absorbing apparatus including an inner tube and an outer tube, said inner tube being inserted into said outer tube and said outer tube being filled with oil, the improvement comprising: an annular protrusion protruding inward from an inner surface of a lower portion of said inner tube; an upper spring socket being disposed inside a lower portion of said inner tube, having an annular groove therein for accommodating said protrusion of said inner tube, thereby fixing said inner tube to said upper spring socket; a lower spring socket being disposed inside a lower portion of said outer tube; a compression spring being disposed between said upper spring socket and said lower spring socket, an upper end of said compression spring being mounted on said upper spring socket, and a lower end of said compression spring being mounted on said lower spring socket, thereby engaging and corelatedly actuating said spring with said inner tube; a hole being formed in the middle of said upper spring socket for enabling oil to flow therethrough; an oil seal being disposed at a top of said outer tube for preventing the spillage of oil; an air inlet socket and an air inlet valve being located at an upper wall of said inner tube for inflating air therein; and a pressure meter being disposed at a top portion of said inner tube for showing air pressure inside said inner tube.

References Cited (Backward Citations)

GB857756A Cited
US3687438A Cited
US4318535A Cited
US4971344A Cited
US4971344B1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-02-17 1995-08-19 1996-02-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-02-17 1999-08-19 2000-02-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-02-17 2003-08-19 2004-02-18 $7700.00 Window Closed / Lapsed

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