| 摘要 |
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.
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