Browdy and Neimark
Burglar alarm including a reed relay actuated in response to a vibrating magnet to produce an alarm signal
 The present disclosure is directed to an improved burglar alarm which is mounted on a base having a concaved space for receiving therein a ring-like magnet with an elongated resilient arm, vibratable as a result of external force, and a magnetic switch tube actuated in response to the vibrating magnet which changes either the magnet polarity or intensity of the magnetic force thereof so to produce signals to actuate a connected alarm apparatus. 
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inventional additional inventional
Yu-Hua
Chen