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Shift mechanism for bicycle

  • US 5,205,794 A
  • Filed: 11/14/1983
  • Issued: 04/27/1993
  • Est. Priority Date: 11/14/1983
  • Status: Expired due to Fees
First Claim
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1. A shift mechanism for a bicycle or the like comprisinga drive sprocket assembly including at least one drive sprocket;

  • means for rotating each drive sprocket;

    a wheel sprocket assembly including at least one sprocket;

    a chain interconnecting a sprocket of the drive sprocket assembly and a sprocket of the wheel sprocket assembly;

    at least one of the sprocket assemblies including at least two sprockets of different diameters;

    means for pivoting at least a segment of one of said two sprockets to place the teeth of said pivoted portion of one of said two sprockets in alignment with teeth of the other of said two sprockets;

    a movable guide channel;

    a guide pawl;

    means attaching the guide pawl to the pivoted segment;

    means for positioning the guide channel according to the sprocket on which the chain is to be entrained; and

    means directing the pawl through the guide channel whereby the position of the pawl as it passes through the guide channel determines the position of each pivoting segment of a sprocket.

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