Earthquake alarm

Details Earthquake alarm Earthquake alarm

1987-10-07

1988-08-16

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6145R, 200DIG29, 307121, G08B 2100, H01H 3502

Patent

active

047647612

ABSTRACT:
Earthquake sensing device which has a ball with a metallic surface which is resting atop a perch having a narrow upper base. In case of a tremor, the ball falls off the perch and is intercepted by a contact plate and thereby closes an electric circuit which includes the ball, the perch, the contact plate, a power supply and an electric sounder, which is activated to sound an alarm.

REFERENCES:
patent: 2794084 (1957-05-01), Segoni
patent: 2912535 (1959-11-01), Sullivan
patent: 4001185 (1977-01-01), Mitsui et al.
patent: 4107545 (1978-08-01), Gittelis
patent: 4124841 (1978-11-01), Kettunen
patent: 4214238 (1980-07-01), Adams et al.
patent: 4297690 (1981-10-01), Baker
patent: 4528559 (1985-07-01), Freeman
patent: 4616320 (1986-10-01), Kerr et al.
patent: 4697174 (1987-09-01), Viator, Sr.

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