Pressure responsive switch and vehicular air bag system using th

Details Pressure responsive switch and vehicular air bag system using th Pressure responsive switch and vehicular air bag system using th

1993-04-27

1995-03-21

Culbreth, Eric D.

Land vehicles

Wheeled

Attachment

B60R 2132

Patent

active

053989651

ABSTRACT:
An air bag system has an improved temperature compensated, pressure responsive switch of construction adapted to respond to a reduction of vessel gas pressure or to the pressure of gas in the switch itself, to reliably inform the vehicle occupants of an abnormal condition. The pressure responsive switch includes a housing defining a volume that is initially at the same pressure as the pressure of the vessel, and a diaphragm in the switch housing segregating the atmospheres of the housing and vessel from each other. An electrical indication circuit in part composed of a pair of electrodes extending from the switch, helical springs in compression between the electrodes and diaphragm, and a resistor, is maintained normally electrically closed. The diaphragm is so constructed and arranged as to rupture or shear from the switch housing in response to a predetermined pressure differential. In other embodiments, an air motion sensor in the form of a movable disk or a stationary, frangible disk bearing a conductive pattern breaks the breakable element or conductive pattern to provide an indication of switch function.

REFERENCES:
patent: Re28624 (1975-11-01), Lewis et al.
patent: 3774150 (1973-11-01), Matsui et al.
patent: 3944769 (1976-03-01), Wagner
patent: 4049935 (1977-09-01), Gruber
patent: 4951810 (1990-08-01), Everett

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