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Device for measuring foot motion and method

  • US 5,574,669 A
  • Filed: 01/25/1995
  • Issued: 11/12/1996
  • Est. Priority Date: 05/28/1993
  • Status: Expired due to Fees
First Claim
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1. A device for timing a moving subject comprising:

  • a first separately movable pad, said first pad comprising means for sensing the presence of the subject contiguous thereto, a second separately movable pad, said second pad comprising means for sensing the presence of the subject contiguous thereto, said first pad sensing means and said second pad sensing means for sensing the presence of the subject contiguous thereto, each of said pad sensing means comprising a separate optical sensor circuit, each of said optical sensor circuits comprising a light source and a light sensor, said light source comprising a light-emitting diode, said light sensor comprising a photo transistor, said light-emitting diode and said photo transistor positioned so that light emitted from said diode and reflected by said subject controls the output current of said photo transistor, electrical circuitry, said electrical circuitry comprising a means for measuring a time interval, means for displaying said time interval, said means for displaying said time interval comprising means for generating a sound, said sound generation means for audibly indicating said time interval, said sound generation means comprising means for generating a sound of variable pitch, said variable pitch sound generation means comprising a flip,flop, said flip-flop for storing the pitch of the sound to be generated, a multi-vibrator, said multi-vibrator connected to said flip-flop, said multi-vibrator for controlling the duration of the sound to be generated, said variable pitch sound generation means for generating a high-pitched sound when said time interval decreases, said variable pitch sound generation means for generating a low-pitched sound when said time interval increases, said time interval displaying means connected to said electrical circuitry, a first flexible cable, said first flexible cable joined to said sensing means of said first pad, a second flexible cable, said second flexible cable joined to said sensing means of said second pad, said first and second flexible cables independently connected to said electrical circuitry and allowing separate movement of said pads to vary the distance therebetween, wherein the time interval between the sensing of the subject contiguous said first pad and the sensing of the subject contiguous said second pad can be displayed.

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