Twist-grip device for operating the gears of a bicycle

Details Twist-grip device for operating the gears of a bicycle Twist-grip device for operating the gears of a bicycle

1990-10-18

1992-08-04

Herrmann, Allan D.

Machine element or mechanism

Control lever and linkage systems

Multiple controlling elements for single controlled element

745022, 74506, 74475, G05G 1100, F16C 110

Patent

active

051348977

ABSTRACT:
A twist-grip device for operating the gears of a bicycle includes indexing associated with the hand-grip for snap-locating the hand-grip in the various positions corresponding to the engagement of the various gear ratios. The device includes a spring which biasses the hand-grip in the opposite sense from the sense of biassing of the spring of the derailleur which effects the engagement of the various gear ratios. The device also includes a screw for adjusting the average torque which needs to be applied to the hand-grip to snap-rotate the hand-grip between two successive positions. The rotation of the screw varies the preloading of a resilient expandable bush associated with the indexing pin springs.

REFERENCES:
patent: 4241617 (1980-12-01), Nagano et al.
patent: 4352303 (1982-10-01), Christner
patent: 4876913 (1989-10-01), Romano

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