Fishing – trapping – and vermin destroying – Traps – Fish
Patent
1982-09-29
1984-03-06
Godici, Nicholas P.
Fishing, trapping, and vermin destroying
Traps
Fish
43 171, A01K 6900
Patent
active
044345755
ABSTRACT:
A new and improved marine trap alarm with a sensing system that includes an electrical current producing source such as a battery, a normally open pair of contacts with at least one movable contact to be actuated by an animal entering the trap, and a trap sensing circuit connected to the open contacts. The trap sensing circuit includes a true comparator and a silicon controlled rectifier. The true comparator prevents an output when the input does not reach a designed threshold value. The true comparator includes the operational amplifier that has critical discrete component values that are engineered to render input current flow bridging the contacts by way of the high saline fluid environment inoperative, thereby eliminating false output signals to an alarm or indicator. When the normally open pair of contacts is closed by the weight of the animal, a differential potential then exists between the inverting and noninverting inputs of the operational amplifier causing the output voltage to rise and trigger the latching circuit to set off the alarm.
REFERENCES:
patent: 3508358 (1970-04-01), Lee
patent: 3878496 (1975-04-01), Erickson
patent: 3942167 (1976-03-01), McClintock
patent: 4004234 (1977-01-01), Juvinall
patent: 4015236 (1977-03-01), Boudeville
patent: 4262284 (1981-04-01), Stieff et al.
patent: 4361827 (1982-11-01), Geller
Godici Nicholas P.
Malin Eugene F.
Rowan Kurt
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