Shift lever apparatus for use in bicycle

Details Shift lever apparatus for use in bicycle Shift lever apparatus for use in bicycle

1993-08-24

1994-11-08

Luong, Vinh T.

Machine element or mechanism

Control lever and linkage systems

Hand operated

74489, 74488, 74577R, 74575, F16C 110, G05G 1100

Patent

active

053616456

ABSTRACT:
A shift lever apparatus for use in bicycles comprising first and second ratchet wheels and first and second switch levers, all of them being mounted on a main shaft. The first and second switch levers contain first and second ratchet pawls for engaging with the first and second ratchet wheels, respectively. The first and second ratchet wheels are connected to a cam via a gear set so as to cause the cam to rotate in forward and reverse directions, respectively. The outer periphery of the cam consists a plurality of spiral sectors, each of which having monotonically increasing radius, alternated with a plurality of circular sectors, each of which having constant radius. When a follower, which is provided in the shift lever apparatus, is in contact with one of the spiral sectors, a movement of the first or the second lever will cause the cam to rotate, in a forward or reverse direction, and the follower to pull or release the shifting cable according, thus allowing the derailleur to shift gear upward or downward.

REFERENCES:
patent: 5012692 (1991-05-01), Nagano
patent: 5186072 (1993-02-01), Nagano
patent: 5203213 (1993-04-01), Nagano
patent: 5213005 (1993-05-01), Nagano
patent: 5241878 (1993-09-01), Nagano

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