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Pneumatic pressure monitoring system

  • US 3,974,477 A
  • Filed: 05/09/1974
  • Issued: 08/10/1976
  • Est. Priority Date: 05/09/1974
  • Status: Expired due to Term
First Claim
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1. A tire pressure monitoring system for a pneumatic tire, said tire being mounted on the rotating part of a wheel assembly of a vehicle or testing assembly wherein the rotating tire is to have its pneumatic pressure continuously monitored by pressure monitoring means mounted on said tire, wherein pressure changes from normal to abnormal and abnormal to normal produce detectable changes in condition of said pressure monitoring means and wherein it is desired to transmit said changes from said pressure monitoring means to the relatively stationary part of said vehicle or said testing assembly, comprising the following interconnected electrical and mechanical components:

  • electrical conduction means for transmitting said change in condition of said pressure monitoring means;

    said electrical conduction means being mounted on said rotating part of the wheel assembly and connected to said pressure monitoring means;

    magnetic coupling means using only the law of electromagnetics known as Lenz'"'"'s Law for magnetically transmitting one of said changes in condition of said pressure monitoring means for said rotating part of the wheel assembly to the stationary part of said vehicle or testing assembly;

    said magnetic coupling means being composed of two parts magnetically coupled to each other at each revolution of said rotating portion of said wheel assembly with the first of said parts mounted on said rotating portion of said wheel assembly and electrically connected to said electrical conduction means and with the second of said parts mounted to said stationary part of said vehicle or said testing assembly;

    emf conduction means for transmitting said change in condition of said pressure monitoring means from said magnetic coupling means;

    said emf conduction means being mounted on said stationary part of said vehicle or said testing assembly and electrically connected to said second part of said magnetic coupling means; and

    circuit sensing and indication means for sensing said change in condition of said pressure monitoring means from the normal to the abnormal condition transmitted by said second part of said magnetic coupling means and indicating said change to the operator of said vehicle or said testing assembly;

    said circuit sensing and indication means being mounted on said stationary part of said vehicle or said testing assembly and electrically connected to said emf conduction means.

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