Overdrive system for four-wheel bicycle

Land vehicles – Wheeled – Occupant propelled type

Reexamination Certificate

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Details

C280S257000, C280S252000

Reexamination Certificate

active

07878520

ABSTRACT:
Disclosed is an overdrive system for a bicycle, which increases the speed through use of a combination of a plurality of sprockets and ratchet wheels, and which drives with less power where a user steps on a pedal of a drive lever using the principle of a lever as overdrive generating means.

REFERENCES:
patent: 833314 (1906-10-01), Fothergill
patent: 1600646 (1926-09-01), Stetson
patent: 1798971 (1931-03-01), Clements
patent: 2607613 (1952-08-01), Lesaunier
patent: 6079727 (2000-06-01), Fan
patent: 6241269 (2001-06-01), Fan
patent: 6270102 (2001-08-01), Fan
patent: 6688624 (2004-02-01), Christensen et al.
patent: 6769706 (2004-08-01), Chow
patent: 6857648 (2005-02-01), Mehmet
patent: 7621547 (2009-11-01), Fan
patent: 7686316 (2010-03-01), Pasternak
patent: 2007/0120341 (2007-05-01), Pasternak
patent: 10-2006-0006902 (2006-12-01), None

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