| 摘要 |
A deceleration switch for detecting deceleration in excess of a certain magnitude which, for instance, may be indicative of a vehicle crash, comprising: a contact set electrically connected to a pair of output terminals; a mass supported by a spring member and adapted to move from a neutral position to an active position for actuating the contact set under its inertia force when deceleration of a certain magnitude is applied to the switch; and a circuit for monitoring the electric conductivity between two points of the spring member for detecting any break in the spring member. An extra terminal may be provided, in addition to the output terminals, for permitting access to the two points. Alternatively, by connecting a resistor across the contact set, which consists of an normally open contact set, it is possible to detect any fracture in the spring member or in the contact set by monitoring the electric resistance across the output terminals of the deceleration switch. Thus, since the condition of the spring member, which is subjected to vehicle vibrations, can be always monitored, the reliability of the deceleration switch is much improved.
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