The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1981
Filed:
Jul. 26, 1979
Eduard Bergles, Graz, AT;
Fichtel & Sachs AG, Schweinfurt, DE;
Abstract
In a device for shifting the drive chain on a multi-speed bicycle, a unit having a plurality of concentrically arranged different diameter chain wheels is secured on the axle of the bicycle's driven wheel. A chain trained over one of the chain wheels, passes over a chain guide wheel, and is rotatably supported on a movable support member. By displacing the chain guide wheel, the chain can be moved onto a selected chain wheel. A linkage arrangement is connected to the movable support member and to an adjusting switch for selecting one of the chain wheels. The linkage arrangement includes a first linkage part connected to the movable support member and a second linkage part articulated to the first linkage part so that the two parts are movable relative to one another. A cam disc is mounted on the second linkage part and a cam disc follower is mounted on the first linkage part. A readjustment spring forms a part of the guide device and acts on the first linkage part for maintaining the follower in contact with the cam disc.