Communications: electrical – Systems – Call station
Patent
1975-11-12
1978-02-21
Waring, Alvin H.
Communications: electrical
Systems
Call station
340272, 200 85R, G08B 1310
Patent
active
040756165
ABSTRACT:
Sensing devices responsive to changes in the physical condition of the area in which they are located are disposed in elongate, flexible carriers to form a detecting unit which can be arranged in a tortuous, undulating array to cover an undefined area of any shape desired with a detecting density of any chosen value. The detecting unit can assume various forms including that of a pair of conducting elements disposed within an insulating tube in opposed relation positioned to complete the continuity of a switching circuit when the tube is flexed to cause engagement of the conductors. Another embodiment comprises a plurality of braided strands of insulating material extending lengthwise within an insulating carrier cable sheath. A pair of conductors is included in the braiding in a spiral disposition with each conductor being disposed along the entire length in opposed relation to the other conductor. Another embodiment includes a closed tubular element filled with an inelastic fluid having a servomechanism at one end to actuate a switching device for an electric alarm circuit in response to a change in liquid level. A modification of this embodiment would include a light responsive element in lieu of a servomechanism of a sensitivity so as to respond to a change in light transmission due to the interference of the liquid when the liquid level moves to a position which interferes with the light transmission source or the ambient light.
REFERENCES:
patent: 2437969 (1948-03-01), Paul
patent: 2843694 (1958-07-01), Bertaux
patent: 3699398 (1972-10-01), Newmeyer
patent: 3748373 (1973-07-01), Remy
patent: 3778804 (1973-12-01), Adair
patent: 3778805 (1973-12-01), Gould
Liss E. Herbert
Waring Alvin H.
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