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Jump platform exerciser for strengthening the ankle extensors

  • US 5,125,647 A
  • Filed: 03/13/1990
  • Issued: 06/30/1992
  • Est. Priority Date: 03/13/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus with which a user may perform jumping exercises which comprises:

  • a platform means on which a user may stand and perform a succession of jumps in which, during each jump, the user is in contact with the platform means for a period of contact time and in flight for a period of flight time;

    a first means in operable combination with said platform means for monitoring said contact time of said jumps;

    a second means in operable combination with said platform means to monitor said flight time of said jumps; and

    wherein said first and second monitoring means each comprise;

    a clock having an output terminal means and that emits clock pulses on said clock output terminal means;

    a means for counting pulses having an output terminal means and a first input terminal means connected to said clock output terminal means and a second input terminal means connected to said common terminal of said monitoring means thereby providing that a signal representing a number of pulses emitted from said clock corresponding to a timing period when said common terminal is at said first potential will be presented at said output terminal means of said counter;

    a means for presetting a signal corresponding to an arbitrary target period;

    a means for comparing signals having an input terminal means connected to said setting means and another input terminal means connected to said ouput terminal means of said counting means thereby providing that a comparator signal will be emitted from an output terminal means of said comparing means when said timing period exceeds said target period;

    a means for latching said comparator signal for a recognition period connected to said output terminal of said comparator;

    a means for signalling connected to said latch thereby emitting a signal to said user while said latch holds said comparator signal.

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