Bicycle speed changing apparatus

Details Bicycle speed changing apparatus Bicycle speed changing apparatus

1996-01-31

1998-03-31

Herrmann, Allan D.

Machine element or mechanism

Mechanical movements

Oscillation or reciprocation to intermittent unidirectional...

74475, 74489, 745022, B62M 2504, B62K 2306

Patent

active

057325936

ABSTRACT:
A bicycle speed changing apparatus comprises a support means, a cable winding means, a fixation plate, a high gear shifting means, a retaining mechanism, a low gear shifting means, and a transmission mechanism. The support means is fastened with the handlebar of a bicycle. The low gear shifting means has a low turning rod connected with the support means by a first retrieving spring and provided with a first braking portion. The cable winding means is connected with the support means by a torsion spring. The fixation plate is provided with a second braking portion. The high gear shifting means has a high turning rod fastened with the fixation plate by a second retrieving spring. The retaining mechanism has a shaft fastened pivotally with the support means and the fixation plate. The shaft is provided with an engaging means and a first cam, a first ratchet portion and a third braking portion. The shaft is connected with the support means by a first pressing spring so as to cause the first cam, the first ratchet portion and the third braking portion to become engaged with the first braking portion, the first engaging portion, and the third cam of the high gear shifting means at the time when the first cam, the first ratchet portion and the third braking portion are set at a neutral position. The transmission mechanism has a shaft fastened pivotally with the high turning rod and provided with a braking member, a second cam and a second ratchet portion. When at a neutral position, the second cam is engaged with the second braking portion. When the high turning rod is actuated, the second ratchet portion is engaged with the second engaging portion.

REFERENCES:
patent: 5012692 (1991-05-01), Nagano
patent: 5095768 (1992-03-01), Nagano
patent: 5203213 (1993-04-01), Nagano
patent: 5213005 (1993-05-01), Nagano
patent: 5241878 (1993-09-01), Nagano
patent: 5307706 (1994-05-01), Nagano
patent: 5400675 (1995-03-01), Nagano

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