Automatic transmission for bicycles

Details Automatic transmission for bicycles Automatic transmission for bicycles

1993-02-05

1994-04-19

Wright, Dirk

Machine element or mechanism

Gearing

Interchangeably locked

74363, F16H 308

Patent

active

053036050

ABSTRACT:
An automatic transmission for mounting within the rear fork of a bicycle includes a plurality of pairs of constant mesh gears and a plurality of discs. Each disc is concentric with one of the gears in each pair and includes a notch for partially enclosing a centrifugally actuated pawl. The notches in adjacent discs face in opposite directions and all the discs but one include a spring for opposing the centrifugal force on each pawl to keep each pawl in a disengaged position. The one disc includes a spring for holding the pawl in an engaged position. The pawls are shaped to permit the bicycle to coast or freewheel.

REFERENCES:
patent: 1670403 (1928-05-01), Davidson
patent: 2047174 (1936-07-01), Baumgartner
patent: 2049103 (1936-07-01), Baumgartner
patent: 2165201 (1939-07-01), Baumgartner
patent: 3772935 (1973-11-01), Dunn et al.
patent: 3977267 (1976-08-01), Graafsma
patent: 4301698 (1981-11-01), Cavanagh
patent: 4716777 (1988-01-01), Hartmann
patent: 5099712 (1992-03-01), Douglass
patent: 5125489 (1992-06-01), Cha

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