Land vehicles – Wheeled – Occupant propelled type
Patent
1994-05-02
1997-03-18
Boehler, Anne Marie
Land vehicles
Wheeled
Occupant propelled type
280284, B62K 2528
Patent
active
056115571
ABSTRACT:
An improved bicycle suspension system wherein the suspension system's characteristics change according to whether a rider is in a standing position or a sitting position. In a standing position, the rider's weight is placed primarily upon the pedal assembly of the bicycle, thereby creating an upward force on the swing arm which places a first compression force upon a shock absorber. In a sitting position, the rider's weight is also placed on a seat of a seat frame. This places a downward force on the seat frame which places a second compression force on the shock absorber. Thus, in the sitting position, the combination of the first and second compression forces, measured as a leverage ratio, is placed upon the shock absorber. In this sitting position situation, the shock absorber is more responsive to irregularities in the road, and provides a softer ride with greater traction and control. In the standing position, since only a first compression force is being exerted against the shock absorber, the suspension system is stiffer and provides a less comfortable ride. However, this allows for a more efficient transfer of pedaling energy which would otherwise be lost due to a "bobbing" effect which exists in softer suspension systems.
REFERENCES:
patent: 4765432 (1988-08-01), Odom
patent: 5029888 (1991-07-01), Allsop et al.
Copy of brochure for Cannondale "Super V" frameset (1 page).
Farris Mark S.
Harrison Michael A.
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