Alarm system for detecting changes in load on terrain

Details Alarm system for detecting changes in load on terrain Alarm system for detecting changes in load on terrain

1978-03-24

1980-08-05

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

116 70, 200 6193, 200 86R, G08B 1310

Patent

active

042164699

ABSTRACT:
A system for detecting changes in load on terrain and actuating an alarm in response thereto including a fluid system, a pressure-sensitive device in the fluid system having a first pressure signal output responsive to a load on a terrain, a second pressure signal output generating device responsive to said first pressure signal output, an alarm and a pressure-sensitive switch connected to said alarm, said switch being responsive to the second pressure signal output to actuate the alarm.

REFERENCES:
patent: 2641689 (1953-06-01), Poitras
patent: 3719939 (1973-03-01), Geil et al.
patent: 4055844 (1977-10-01), Hornbostel, Jr.
patent: 4091370 (1978-05-01), Swanda

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