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Wireless, passive wheel-speed and cadence detection system

  • US 7,408,447 B2
  • Filed: 08/19/2005
  • Issued: 08/05/2008
  • Est. Priority Date: 08/19/2004
  • Status: Expired due to Fees
First Claim
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1. A detection system operable for measuring a cadence of an operator pedaling a bicycle, the bicycle having a frame supporting a pedal assembly, comprising:

  • a cadence circuit operatively connected to the bicycle for measuring the cadence of the operator pedaling the bicycle and generating a cadence signal corresponding to the measured cadence; and

    a transmission circuit for generating a radio frequency signal corresponding to the cadence signal and transmitting the radio frequency signal to a target,wherein the cadence circuit includes;

    a sensing circuit mounted to one of the frame and the pedal assembly;

    an inducement element mounted to the other of the frame and pedal assembly, the inducement element causing the sensing circuit to generate an electrical signal in response to a revolution of the pedal assembly; and

    wherein the sensing circuit includes;

    a pickup coil generating an induced signal in response to the inducement element passing in proximity thereto; and

    a transformer operatively connected to the pickup coil for transforming the induced signal and providing the induced signal to the transmission circuit as the cadence signal.

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