Ground movement sensor

Details Ground movement sensor Ground movement sensor

1994-02-09

1995-05-09

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

181122, 33366, 73652, G01V 116

Patent

active

054146771

ABSTRACT:
An earth movement sensor is provided which consists of a housing having a top shelf and an intermediate shelf. An electrically energizing signalling alarm is carried in the housing. An electrical power source is carried in the housing for the alarm. A pendulum operated switch is suspended from the top shelf in the housing and is operatively connected between the power source and the alarm, to energize the alarm from the power source when there is earth movement.

REFERENCES:
patent: 3962693 (1976-06-01), Schamblin
patent: 4138824 (1979-02-01), Ponce de Leon
patent: 4507603 (1985-03-01), Roach et al.
patent: 4689997 (1987-09-01), Windisch
patent: 4876799 (1989-10-01), Wolf
patent: 4947692 (1990-08-01), Koppel
patent: 4949467 (1990-08-01), Omah et al.
patent: 5065522 (1991-11-01), Motoda et al.

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