Chain shift aiding structure for bicycle sprocket

Details Chain shift aiding structure for bicycle sprocket Chain shift aiding structure for bicycle sprocket

1993-12-13

1995-05-09

Schoeppel, Roger J.

Endless belt power transmission systems or components

Control for variable input to output speed-ratio

Including belt shiftable axially from one to another surface...

474160, 474164, F16H 910

Patent

active

054135346

ABSTRACT:
A sprocket assembly for a bicycle having a large sprocket and a small sprocket. The large sprocket includes chain support projections formed on the side surface opposed to the small sprocket. Each projection includes a contact portion defining a contact surface for contacting, without meshing, a lower end of a chain shifted from the small sprocket to the large sprocket. The chain support means are arranged for causing the contact surface to contact the chain engaging the small sprocket and pick up the chain radially outwardly of the large sprocket during a chain shift from the small sprocket to the large sprocket.

REFERENCES:
patent: 4198876 (1980-04-01), Nagano
patent: 4598608 (1986-07-01), Ueno
patent: 5066264 (1991-11-01), Romano
patent: 5078653 (1992-01-01), Nagano
patent: 5085621 (1992-02-01), Nagano
patent: 5087226 (1992-02-01), Nagano
patent: 5188569 (1993-02-01), Kobayashi
patent: 5192248 (1993-03-01), Nagano

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