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Tire pressure monitor

  • US 5,109,213 A
  • Filed: 07/05/1991
  • Issued: 04/28/1992
  • Est. Priority Date: 07/05/1991
  • Status: Expired due to Fees
First Claim
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1. A tire pressure monitor having means to sense incorrect tire air pressure, and having means for generating digital information upon a sensed incorrect tire air pressure, and further having means of communicating at least in part via radio frequency transmitting and receiving of digital information pertaining to a sensed condition of incorrect tire air pressure to an operator of a vehicle during use of the vehicle, said means for generating digital information and said radio frequency transmitting being initiated by an air pressure sensor means of said tire pressure monitor, said tire pressure monitor further characterized in that, an air pressure conductive means for communicating air pressure within a tire with said air pressure sensor means includes air flow rate restricting means for preventing transitory air pressure changes within a tire from activating said air pressure sensor means, and thereby preventing transitory air pressure changes from falsely initiating said means for generating digital information and said radio frequency transmitting, said restricting means comprising a narrow passage through a side wall of a longitudinal manifold mounted to a tire air pressure source, said passage arranged perpendicular to the longitudinal axis of the manifold, and being connected to a chamber communicating with the tire air pressure source at a first end and a chamber communicating with the air pressure sensor means at the opposite end.

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