Land vehicles – Wheeled – Occupant propelled type
Patent
1994-08-30
1995-09-12
Hill, Mitchell J.
Land vehicles
Wheeled
Occupant propelled type
2671411, 280279, B62K 2108, B62K 2508
Patent
active
054491894
ABSTRACT:
A bicycle with a delayed-return suspension fork with two shock-absorbing units. Each shock-absorbing unit has an upper tube assembly telescopically received in a lower tube assembly with an inner tube assembly slidably retained within the lower tube assembly. An elongate cylinder extends upwardly from a base of the lower tube assembly. An elongate piston extends downwardly from a top of the upper tube assembly and is slidingly received in a distal end of the elongate cylinder. A series of resilient tubular cushions are mounted about the elongate piston. The inner tube assembly defines a chamber in order to contain a fluid. A conduit, a washer, a spring and a positioning seat are contained. When the upper tube assembly travels into the lower tube assembly, fluid is urged through the conduit, the fluid further urges the washer, spring and positioning seat away from the conduit permitting rapid passage of the fluid. However, as the load is removed from the bicycle, the spring urges the washer back to the conduit partially blocking the passage of the fluid resulting in a return stroke slower than the compression stroke.
REFERENCES:
patent: 5088705 (1992-02-01), Tsai
patent: 5284352 (1994-02-01), Chen
patent: 5310203 (1994-05-01), Chen
patent: 5367918 (1994-11-01), Chang et al.
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