Protective alarm system

Details Protective alarm system Protective alarm system

1975-02-03

1976-08-17

Caldwell, John W.

Communications: electrical

Systems

Call station

340 52H, 200 6152, 200 6183, G08B 2100, H01H 3502, H01H 3514

Patent

active

039757226

ABSTRACT:
A vibration sensitive electrical alarm system comprising an electrically conductive pendulum means swingably suspended from an axle member, a pendent body pivotally attached to said axle and having an electrically conductive projection secured to it extending in the direction of said pendulum means, the arrangement being such that when the pendulum means is set into motion, it is adapted to touch said projection whereby an alarm is activated.

REFERENCES:
patent: 2947830 (1960-08-01), Goss
patent: 3659265 (1972-04-01), Eversull
patent: 3715533 (1973-02-01), Seaton

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