Patent ID: 7078637
Filing Date: 2006-07-18
Classification: H01H

Abstract:
1. A low air pressure switch for an automobile, comprising: a switch body having an air inlet by which the switch body communicates with a pneumatic line of a vehicle; a diaphragm installed in the switch body, which operates in response to a change of a pressure of air applied to the air inlet; a plunger closely contacting with the diaphragm, which accordingly moves together with the diaphragm; a contact plate disposed between the diaphragm and the plunger; a spring elastically supporting the plunger; a switch cover encompassing the plunger and the spring; a dividing wall for separating an inner space of the switch cover into a spring chamber and a connector part; and two connectors located in the connector part, wherein the two connectors are conductively coupled to the spring and the contact plate, respectively; wherein the plunger electrically contacts the spring and the spring exerts a biasing force on the plunger toward the contact plate, said biasing being resisted by air pressure in the air inlet such that a decreased air pressure causes biasing of the plunger into contact with the contact plate.