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Tire pressure monitor

  • US 4,229,728 A
  • Filed: 12/20/1978
  • Issued: 10/21/1980
  • Est. Priority Date: 12/20/1978
  • Status: Expired due to Term
First Claim
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1. A tire pressure monitor for use in a vehicle having at least one pneumatic tire, said tire pressure monitor comprising:

  • a cylindrical generator housing adapted for coaxial mounting upon an automobile wheel and defining a pivot internally axially aligned therewith;

    an inductor mounted within said housing for rotation therewith at a point radially spaced from said pivot, said inductor having a magnetic axis normal to said pivot;

    a yoke mounted for rotation about said pivot;

    a pendulum weight mounted to said yoke for rotation therewith, said weight being radially displaceable between a first position adjacent said yoke and a second position adjacent the circumferential wall of said housing;

    spring means operative to bias said weight into said first position;

    a permanent magnet mounted for displacement with said weight and disposed in rotational alignment with said inductor, said inductor and magnet coacting during relative rotation therebetween to generate an electrical potential;

    transmitter means disposed within said housing, and operative to receive said electrical potential and to generate a low tire condition signal when the fluid pressure within said tire falls below a predetermined value; and

    receiver means disposed remotely from said transmitter means and operative to receive said low tire condition signal and to generate an alarm signal as a function thereof.

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