Pressure-sensitive signalling device for detecting intrusion int

Details Pressure-sensitive signalling device for detecting intrusion int Pressure-sensitive signalling device for detecting intrusion int

1979-07-31

1981-05-26

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

310311, G08B 1310

Patent

active

042701228

ABSTRACT:
A signalling apparatus with pressure sensors, in particular for sensing intrusion into a closed surface area, with a yielding pipe embedded underground along the periphery of the surface area and filled with fluid; the pipe being divided into two separate sections by a deformable baffle plate to which are connected sensor means for supplying a signal depending on the deformation of said baffle plate, for initiating signalling means when said baffle plate is deformed.

REFERENCES:
patent: 3109165 (1963-10-01), Bagno
patent: 3438021 (1969-04-01), Nelkin et al.
patent: 3665445 (1972-05-01), Riley, Jr.
patent: 4081785 (1978-03-01), Ravis et al.

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