Movement detector with mercury switch

Details Movement detector with mercury switch Movement detector with mercury switch

G - Physics

08

B

340/124, 340/148

G08B 21/00 (2006.01) G08B 21/04 (2006.01)

Patent

CA 1298379

ABSTRACT OF THE DISCLOSURE An alert device is provided which initiates an alarm if a person wearing the device ceases normal movement. The device includes a movement sensor having at least one mercury switch which generates a signal when the mercury shifts in response to movement. The device also includes a microcomputer to receive the mercury switch input signals--the microcomputer being programmed to distinguish between inputs indicative of normal wearer movement and inputs which may represent a wearer in duress. Preferably, the motion sensor provides three mercury switches oriented to sense movement in three normal planes.

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