Variable-ratio transmissions, separately and in bicycles

Details Variable-ratio transmissions, separately and in bicycles Variable-ratio transmissions, separately and in bicycles

1988-12-07

1990-05-15

Mitchell, David M.

Land vehicles

Wheeled

Occupant propelled type

192 64, 280236, 280260, B62M 2502, F16D 2300

Patent

active

049252011

ABSTRACT:
Drive mechanism, particularly for use with a bicycle, of the type having variable diameter drive and driven members connected by an endless belt which engages adjustable segments on the members. Through a control means the drive ratio can be adjusted to multiple, discrete settings. Belt wrap is maintained between the belt and the drive and driven members at all settings by two idlers which are independently supported for movement. A locking rail is used to release and secure the segments on the members and a split clutch is used with the driven member for easy rear wheel removal. The mechanism has a lost motion device to accommodate forward and rearward pedaling without harming the drive mechanism. The drive mechanism is modular in construction so it can be used with frames of varying sizes and the drive mechanism can be quickly removed from or assembled to the bicycle frame when replacement is desired.

REFERENCES:
patent: 3650363 (1972-03-01), Cristie
patent: 3990715 (1976-11-01), Shimada
patent: 4598920 (1986-07-01), Dutil et al.

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