Bicycle gear shifting method and apparatus

  • US 4,900,291 A
  • Filed: 01/05/1989
  • Issued: 02/13/1990
  • Est. Priority Date: 01/06/1988
  • Status: Expired due to Term
First Claim
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1. A bicycle derailleur gear shifting system, which comprises:

  • derailleur shifting means having return spring means operatively associated with the rear wheel of the bicycle;

    handgrip shift actuator cam means rotatably mounted on the bicycle handlebar generally coaxially of the handlebar;

    control cable means having one end operatively associated with said cam means and the other end operatively connected to said derailleur shifting means, said cable means being biased toward said derailleur shifting means by said return spring means;

    said cam means being configured so that rotational movement thereof in one direction will cause said cam means to pull said cable means against the biasing force of said spring means so as to cause down-shifting of said shifting means, and rotation thereof in the opposite direction will release said cable means in the direction of the biasing force of said spring means so as to cause up-shifting of said shifting means.

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