Shifting unit for a bicycle

Details Shifting unit for a bicycle Shifting unit for a bicycle

1999-01-28

2000-12-05

Bucci, David A.

Machine element or mechanism

Control lever and linkage systems

Hand operated

74489, F16C 112

Patent

active

061551325

ABSTRACT:
A shifting unit for a bicycle is basically provided with a mounting member, a first shifting lever, a first biasing member, a second shifting lever, a second biasing member and release mechanism. Many of the parts of the shifting unit are constructed by pressing a metal sheet material. The first shifting lever is pivotally coupled to the mounting member between at least first, second and third shift positions, with the second shift position being located between the first and third shift positions. The first biasing member applies a biasing force that urges the first shifting lever from the second and third shift positions towards the first shift position. The second shifting lever is pivotally coupled to the mounting member between a set position and a release position. The second biasing member applies a biasing force that urges the second shifting lever from the release position to the set position. The release mechanism is operatively coupled between the first and second shifting levers to hold the first shifting lever in one of the first, second and third shift positions against the first biasing force of the first biasing member. The release mechanism is moved to selectively release one of the second and third locking portions from the first shifting lever upon rotation of the second shifting lever from the set position to the release position such that the first shifting lever moves one only position.

REFERENCES:
patent: 5012692 (1991-05-01), Nagano
patent: 5094120 (1992-03-01), Tagawa
patent: 5203213 (1993-04-01), Nagano
patent: 5213005 (1993-05-01), Nagano
patent: 5676022 (1997-10-01), Ose
patent: 5730030 (1998-03-01), Masui
patent: 5957002 (1999-09-01), Ueng

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