Gear shifting device for a multi-speed bicycle

Details Gear shifting device for a multi-speed bicycle Gear shifting device for a multi-speed bicycle

1995-11-13

1997-08-26

Marmor, Charles A.

Machine element or mechanism

Control lever and linkage systems

Hand operated

74475, 74489, B62M 2504

Patent

active

056600836

ABSTRACT:
A gear shifting device for a multi-speed bicycle includes a sleeve member having a flange to one side of which a drum housing is connected and to another side of which a rotary grip member is connected by means of a locking and returning device. A ratchet wheel is put over and around the sleeve member within the drum housing, a transmission steel cord reel is connected to one side of the ratchet wheel and is fixed to the sleeve member by a pullback spring. Two ratchet pawls are separately pivotally connected to the rotary grip member and the sleeve member, each having a pawl spring fixedly connected thereto to cause a pawl end of each ratchet pawl to normally contact the ratchet teeth of the ratchet wheel. A lever member is used for pushing the ratchet pawls is located within the drum housing and has a push lever extending through a slot formed on the drum housing and two projections for pushing the two ratchet pawls. The gear shifting mechanism is associated with a handlebar grip of the multi-speed bicycle, to enable a rider to easily rotate the rotary grip member or press the push lever of the lever member with a thumb to change the gearing of the bicycle.

REFERENCES:
patent: 5241877 (1993-09-01), Chen
patent: 5481934 (1996-01-01), Tagawa

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