Bicycle transmission and the method of utilizing the same

Details Bicycle transmission and the method of utilizing the same Bicycle transmission and the method of utilizing the same

1995-05-18

1997-05-06

Johnson, Brian L.

Land vehicles

Wheeled

Occupant propelled type

280259, 476 18, 476 22, 476 39, 476 51, 476 63, B62M 1104

Patent

active

056263546

ABSTRACT:
A continuously variable friction drive transmission for a bicycle is provided by driving the rear bicycle wheel by frictional engagement with a rotating rim driver. The rim driver has a lateral conical surface matching a lateral conical surface of a driver plate. A transmission driver wheel is selectively positioned between the lateral conical surfaces of the rim driver and driver plate. The position along a shifting arm of the transmission driver wheel determines the speed ratios obtained between the driver plate and rim driver. The driver plate is then rotated by the pedal assembly through a speed increasing coupling. The transmission driver wheel is always in contact with the driver plate. When the driver plate ceases to rotate and the rear wheel and rim driver continue to rotate, the force on the transmission driver wheel automatically rotates the shifting arm on which the transmission driver wheel is coupled to kick the transmission driver wheel out of engagement with the conical surface of the rim driver thereby allowing the rear bicycle wheel to freewheel. The transmission driver wheel is returned into mutual engagement between the conical surfaces of the driver plate and rim driver, when the driver plate again rotates at a speed fast enough to couple the driver plate and rim driver again into a force transmitting relationship.

REFERENCES:
patent: 1116373 (1914-11-01), Besserdich
patent: 2917934 (1959-12-01), Bielsen
patent: 4447068 (1984-05-01), Brooks
patent: 4856357 (1989-08-01), David
patent: 5136892 (1992-08-01), Ochs

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