Bicycle drive mechanism

Details Bicycle drive mechanism Bicycle drive mechanism

1981-11-19

1984-05-08

Peters, Jr., Joseph F.

Land vehicles

Wheeled

Occupant propelled type

74194, 74351, 280238, B62M 900, F16H 112

Patent

active

044470681

ABSTRACT:
An improved bicycle drive assembly characterized by an elongated, rotary drive shaft, a front gear assembly coupling the forward end of the drive shaft to the bicycle's crank-and-pedal assembly, a disk gear provided with a plurality of radial grooves on its outer face, a torque-shift gear assembly slidingly engaged to the drive shaft and keyed for mutual rotation therewith, and an adjustable spring assembly for biasing the torque-shift gear assembly towards the center of the disk gear. As the torque on the drive shaft is increased the torque-shift gear assembly is forced laterally out across the face of the disk gear to cause a down-shift in gear ratios. As the torque on the drive shaft decreases the spring assembly forces the torque-shift gear back towards the center of the disk gear to up-shift the gearing ratio.

REFERENCES:
patent: 479470 (1892-07-01), Smallwood
patent: 624964 (1899-05-01), Oberhammer
patent: 649878 (1900-05-01), Scharbach
patent: 662891 (1900-11-01), Copeland
patent: 675067 (1901-05-01), Nichols
patent: 715404 (1902-12-01), Markgraf
patent: 2378634 (1945-06-01), Hussey
patent: 2475654 (1949-07-01), Watson
patent: 3861715 (1975-01-01), Mendoza
patent: 3934481 (1976-01-01), Foster
patent: 4005611 (1977-02-01), Jeffries

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