Electromechanical earthquake alarm

Details Electromechanical earthquake alarm Electromechanical earthquake alarm

1992-08-21

1994-01-11

Hofsass, Jeffrey

Communications: electrical

Condition responsive indicating system

Specific condition

340690, 200 6145R, 200 6152, G01W 100

Patent

active

052785408

ABSTRACT:
An earthquake sensor in which a weight falls from a support surface and activates a switch in the event of an earthquake. The support surface is preferably a bell with its opened end downward and the weight resting on a concave, recessed region at the closed end of the bell. The bell is preferably supported by a shaft along the axis of the bell, the tip of which the bell pivots about like a pendulum. A conductive cylinder encircles the bell near its bottom. When the earth moves, the weight falls down the inclined surface of the bell, wedging between the bell and the cylinder, forcing the bell to pivot over to electrically connect the bell to the cylinder. In an alternative embodiment, the weight electrically connects the bell and the cylinder, and the bell does not pivot.

REFERENCES:
patent: 1625625 (1927-04-01), Ricker
patent: 3990039 (1976-11-01), Miller
patent: 4086807 (1978-05-01), Nakada
patent: 4364033 (1982-12-01), Tsay
patent: 4689997 (1987-09-01), Windisch
patent: 4764761 (1988-08-01), Maguire, III
patent: 4775854 (1988-10-01), Cottrell
patent: 4789922 (1988-12-01), Cheshire

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