Electric alarm device

Details Electric alarm device Electric alarm device

1980-08-25

1982-08-31

Robinson, Thomas A.

Communications: electrical

Audible indication

Diaphragm

340404, G08B 300, G10K 900

Patent

active

043475000

ABSTRACT:
In an electric alarm device, a disk-shape housing has an opening on one surface and a substantially flat bottom surface on the other surface. A diaphragm is fixed to the periphery of the housing to close the opening of the housing. An armature is mounted within the housing and coupled to the diaphragm to move with the diaphragm. A solenoid coil unit is fixed to the housing within the housing to generate magnetic fluxes for attracting the armature. A switch is mounted within the housing to detect the movement of the diaphragm to conduct and break the current to the solenoid coil unit.

REFERENCES:
patent: 1209403 (1916-12-01), Dean
patent: 1231835 (1917-07-01), Ames
patent: 1243047 (1917-10-01), Dean

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