Low tire alarm

B - Operations – Transporting – 60 – C

Patent

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Details

340/145.1

B60C 23/00 (2006.01) B60C 23/08 (2006.01) G01L 17/00 (2006.01)

Patent

CA 1087273

TITLE: LOW TIRE ALARM Abstract of the Disclosure An alarm for indicating low pressure in a ground engaging pneumatic tire of a vehicle. The alarm is operated through the electrical system of the vehicle to warn the vehicle operator of a low pressure condition in one or more of the ground engaging vehicle tires as the vehicle moves along a roadway. A switch arrangement is mounted within a housing at a point on the vehicle closely adjacent to a ground supporting wheel. A feeler member extends downwardly from the housing to an end that is normally held above the ground level when the associated vehicle tire is in a normally inflated condition. The feeler member is pivoted on a shaft within the housing. An integral swing arm extends from the feeler arm to a free end that mounts an electrical contact surface. An integral spring member connects the feeler and swing arm to the housing. The spring resists pivotal movement of the contact surface. An insulator mounts an electrically conductive pad to the housing. A single electrical wire leads from the pad to connect in a series circuit with a lamp and an ungrounded side of the vehicle electrical power supply. Thus, when contact is made with the road surface by the feeler member, a circuit is completed to light the lamp. The feeler may engage the ground only if the adjacent tire becomes deflated to allow the feeler to move downwardly into contact with the ground surface. Upon engaging the roadway surface, the feeler pivots about the shaft axis against resistance of the spring and correspondingly pivots the electrical contact surface into engage- ment with the pad, grounding the circuit through the vehicle axle. A cushion is held within the housing to effectively seal the housing.

283902

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