| 摘要 |
An alarm device responsive to vibration includes a unitary housing in which is disposed an SCR for connecting an alarm signal to an associated source of power, the gate of the SCR being connected to a pendulum and ring assembly with the pendulum being normally suspended within the ring out of engagement therewith but which moves into engagement with the ring when the housing is subjected to vibration to apply power to the SCR gate so that the SCR conducts to actuate the alarm signal for indicating the application of a vibration to the housing or a supporting structure on which the housing is mounted. The alarm device may also include timing circuitry which deactivates the SCR after a predetermined period of time.
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