Earthquake warning device

Details Earthquake warning device Earthquake warning device

1992-06-04

1993-09-28

Hofsass, Jeffrey

Communications: electrical

Condition responsive indicating system

Specific condition

340690, 200 6145R, 200DIG29, 73654, G01N 100

Patent

active

052489590

ABSTRACT:
An earthquake warning device including a speaker disposed in a housing, a casing disposed above the housing, a pair of electrically conductive sheet members disposed in a lower portion of the casing and electrically coupled to the speaker, a support disposed in the casing having a flat upper surface, and an electrically conductive ball disposed on the flat upper surface of the support. The ball will move away from the flat upper surface and downward to electrically connect the sheet members together when a vibration occurs to cause the speaker to generate a warning sound.

REFERENCES:
patent: 4764761 (1988-08-01), Maguire, III
patent: 4789922 (1988-12-01), Cheshire

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