Improved brakes for bicycles and other chain driven mechanisms

B - Operations – Transporting – 62 – L

Patent

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Details

B62L 5/10 (2006.01) B62L 5/00 (2006.01) B62L 5/18 (2006.01) B62L 5/20 (2006.01)

Patent

CA 2215404

The invention provides a crank assembly for a chain driven mechanism such as a bicycle. The crank assembly has at one end of a crank arm, a journal adapted for engagement with an axle. The axle has at its other end a connection. The one end of the crank arm has mounted thereon a housing via a sprag clutch, the housing having an extension to which, in use, an activation means such as a brake cable or cables is/are attached. The arrangement is such that during normal forward rotation the crank arm moves normally and the housing is stationary relative thereto, while during back or reverse movement of the crank arm the housing moves to activate the brake cable or cable means.

Cette invention concerne un levier coudé pour un mécanisme entraîné par chaîne tel qu'une bicyclette. Ce levier coudé possède, à une extrémité d'un bras coudé, un tourillon conçu pour s'accoupler à un moyeu, lequel moyeu est équipé à son autre extrémité d'un système de fixation. Un boîtier est monté par l'intermédiaire d'un embrayage à roue libre sur l'extrémité du bras coudé, lequel boîtier possède un élément d'extension auquel est attaché, durant l'utilisation, un système d'actionnement tel qu'un ou plusieurs câbles de freinage. Ce dispositif est conçu de manière à ce que, au cours de la rotation normale vers l'avant, le bras coudé se déplace normalement, le boîtier restant immobile par rapport à celui-ci. Lors d'un mouvement vers l'arrière du bras coudé, le boîtier se déplace de manière à entraîner le câble de freinage ou le système de câbles.

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