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Warning system including means for remotely energizing condition sensing device

  • US 4,717,905 A
  • Filed: 05/24/1985
  • Issued: 01/05/1988
  • Est. Priority Date: 05/24/1985
  • Status: Expired due to Term
First Claim
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1. Tire pressure monitoring apparatus comprising:

  • a tire pressure monitoring means including an energy detector disposed outside the tire and selected from the group consisting of an infra-red detector and an ultrasound detector, said energy detector having directivity such that the detector is normally pointed toward the ground so that detected energy normally passes by a point on the peripheral portion of the tire whereby if a significant change in the tire pressure occurs, the circumferential portion of the tire will be interposed in the said path the detected energy follows to thereby effect a substantial change in the level of said detected energy and thus detect said substantial change in the tire pressure; and

    means for transmitting a signal to a remote location representative of said substantial change in the tire pressure and for alerting of an operator thereof.

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