Bicycle wheel travel path for selectively applying chainstay lengthening effect and apparatus for providing same

  • US 5,628,524 A
  • Filed: 11/15/1995
  • Issued: 05/13/1997
  • Est. Priority Date: 01/25/1995
  • Status: Expired due to Fees
First Claim
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1. A compressible rear suspension for a bicycle, comprisinga chain drive in which a chainstay length is the distance in the rearward direction from the axis of a pedal-operated drive sprocket to the axis of a rear wheel hub, which is represented by a variable value CSL;

  • andmeans for moving said rear wheel in a generally upward direction along a controlled wheel travel path in response to compression of said suspension, in which the position of said hub along said path from a predetermined starting point at which said suspension is extended is represented by a variable value D which increases with increasing compression of said suspension, said controlled wheel travel path comprising;

    a preferred pedaling position at a predetermined position Dp which is located along said wheel travel path;

    a lower curve segment extending generally below said position Dp in which there is an increasing rate of chainstay lengthening with increasing compression of said suspension system, such that the first derivative relationship ##EQU13## is a curve having a generally positive slope, so that the second derivative relationship ##EQU14## is generally positive; and

    an upwardly and forwardly curved upper curve segment extending generally above said position Dp in which there is a decreasing rate of chainstay lengthening with increasing compression of said suspension system, such that the first derivative relationship ##EQU15## is a curve having a generally negative slope, so that the second derivative relationship ##EQU16## is generally negative.

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