| 摘要 |
An improved comprehensive tire pressure differential sensing device for furnishing selectively warnings for either excessive or insufficient normal tire pressure having in a housing a sliding piston positioned in a passageway, a spring urging said piston in a given axial direction, an air chamber formed in part by a diaphragm for receiving air under pressure urging the piston in an axial direction overcoming the force of the spring, a slot in the piston receiving a split contact pin, the pin having an insulation layer throughout its medial plane for forming two distinct electrical circuits, and circuit means for selectively indicating that an excess or inadequate pressure condition exists in a given tire.
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