Gear shifting sprocket set for bicycle chain wheel

Details Gear shifting sprocket set for bicycle chain wheel Gear shifting sprocket set for bicycle chain wheel

1997-05-30

1999-03-02

Walsh, Donald P.

Endless belt power transmission systems or components

Positive drive pulley or guide roll

And additional coaxial surface for engaging same belt in...

474 78, 474 80, 474140, 474152, 474155, 474164, F16H 5512

Patent

active

058762965

ABSTRACT:
A bicycle sprocket set is composed of a small sprocket and a large sprocket coaxial with the small sprocket. The large sprocket is provided with an axially oriented recess in the bottom portion located between the first tooth and the second tooth of the large sprocket. The recess has a support curved face extending from the second tooth. The large sprocket is further provided with a support protrusion located under the support curved face such that the support protrusion is separated from the support curved face by a distance corresponding to about one tooth pitch. The support curved face and the support protrusion serve to support the inner and the outer chain plates of a drive chain at such time when the gearshifting takes place.

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patent: 5609536 (1997-03-01), Hsu

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