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Rotation sensor for an electrical bike pedal

  • US 9,739,608 B2
  • Filed: 04/09/2013
  • Issued: 08/22/2017
  • Est. Priority Date: 04/09/2012
  • Status: Expired due to Fees
First Claim
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1. A device for detecting rotation of a bicycle crank, the device comprising:

  • a member attachment bracket, an encoder, an encoder shaft, and an eccentric mass, wherein the encoder, having a quadrature output to detect pedaling direction, shares the encoder shaft with the eccentric mass, whereby the encoder is attached to the member attachment bracket which is removably attached to the bicycle crank;

    the encoder provides an electronic measurement of bicycle crank rotation by detecting rotation of the bicycle crank by gravity causing the eccentric mass to maintain its orientation with reference to ground as the bicycle crank rotates, wherein the eccentric mass is adapted to react to discontinued motion of the bicycle crank within a time of 100 ms;

    a battery system operably connected to the encoder; and

    a transmitter to electronically transmit the electronic measurement of bicycle crank rotation.

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