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Derailleur for a bicycle

  • US RE30,524 E
  • Filed: 05/03/1977
  • Issued: 02/24/1981
  • Est. Priority Date: 08/03/1974
  • Status: Expired due to Term
First Claim
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1. A derailleur for a bicycle, which is pulled by .[.control wires.]. .Iadd.at least one control wire .Iaddend.to change the speed of the bicycle by moving a driving chain to a selective sprocket of a freewheel, said derailleur comprising:

  • a. four members including a first fitting member, second and third linkage members each pivotally mounted at one end to said fitting member, and a fourth movable member pivotally supported at one end to each other end of said linkage members, said linkage members being swingable with respect to said fitting member and with respect to each other, said fourth movable member being swingable with respect to said linkage members and to said fitting member;

    b. cages coupled to the other end of said fourth movable member and having two chain guide pulleys freely movable with said fourth movable member to move the driving chain; and

    c. means, coupled on two of said four members which are movable with respect to each other, for maintaining the position of said cages, said maintaining mean including a holder on one of said two members and having a plurality of engageable portions, and a retainer on the other of said two members and engageable with any one of said engageable portions.

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