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High-low tire pressure signal switch

  • US 3,961,309 A
  • Filed: 06/18/1975
  • Issued: 06/01/1976
  • Est. Priority Date: 04/14/1975
  • Status: Expired due to Term
First Claim
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1. In a vehicle tire pressure signaling system of a type in which magnetically activated alarm circuitry is actuated by a pressure switch, the construction including pressure cylinder means having pressure and contactor ends;

  • rod and O-ring piston means having pressure and switch contactor ends movable in said cylinder means;

    spring means in the cylinder means reacting between the cylinder and piston means normally biasing the piston means toward the cylinder means pressure end to maintain the piston means in an intermediate position when the pressure ends of the piston and cylinder means are exposed to predetermined desired tire pressure;

    the cylinder means contactor end having electrical contactors;

    the piston rod contactor end having contactor means adapted to engage the cylinder means contactors in switch closed position when the piston means is in intermediate position to provide a circuit through the piston rod;

    the piston means being movable in the cylinder means in one direction or the other from intermediate position upon change in tire pressure to above or below the said predetermined desired value to establish an open switch condition of the switch contactors and to open the circuit through the piston rod; and

    means connecting said switch contactors with magnetically activated signaling system circuitry.

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