Communications: electrical – Selective – Intelligence comparison for controlling
Patent
1977-04-20
1978-06-20
Farley, Richard A.
Communications: electrical
Selective
Intelligence comparison for controlling
200 6105, 340 4E, H04B 1100, H01H 2900
Patent
active
040964663
ABSTRACT:
Underwater switching of electrical apparatus is accomplished by providing two terminals at the exterior surface of a unit to be immersed in water so that a conductive bridge is formed between the terminals through the water. Those terminals are included in a circuit in which switching action is to occur. To switch the circuit, at least one of the two terminals is covered so that it is no longer engaged by the water through which the conductor bridge is formed. In one form of the invention, one of the terminals is covered with one of the user's fingers.
To provide a positive switching action and to insure that switching action results, whether the bridge is formed through highly conductive salt water or less conductive fresh water, the switching circuit is arranged so that the impedance to flow of an element in that circuit is made to change greatly in response to covering of one of the terminals. In one form, that function is accomplished by including a Zener diode in series with the switch terminals.
REFERENCES:
patent: 3249913 (1966-05-01), Smyth et al.
patent: 3602661 (1971-08-01), Liedberg
patent: 3727182 (1973-04-01), Snyder
patent: 3821699 (1974-06-01), Marus et al.
patent: 3914592 (1975-10-01), Maxey
Farley Richard A.
Frater Grover A.
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