Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1978-02-03
1982-09-14
Miller, J. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
250239, H01H 4724
Patent
active
043498574
ABSTRACT:
A light responsive control device comprising a light sensitive element, having a resistance which corresponds to the amount of light incident thereon, and an electromagnet having its coil connected in series with the light sensitive element. An armature is operated by the electromagnet so that it engages a contact member positioned below the armature when the electromagnet is deenergized and is separated therefrom when the electromagnet is energized. A non-magnetic element is secured to a surface of the armature to assure prompt release of the armature when the electromagnet is deenergized and a non-magnetic guide pin attached to the non-magnetic element extends into an aperture in the electromagnet to guide the movement of the armature. When the ambient light impinging on the light sensitive element is low, its resistance is high and a load connected between the armature and contact member is energized. An increase in the ambient light above a predetermined level causes the resistance of the light sensitive element to decrease thereby energizing the electromagnet and opening the load circuit. The pick-up and drop-out of the relay occurs within a narrow range surrounding a nominal predetermined value.
REFERENCES:
patent: 725523 (1903-04-01), Wellman
patent: 2531025 (1950-11-01), Bradley
patent: 2877390 (1959-03-01), Trombetta
patent: 2898525 (1959-08-01), Jacobs
patent: 2978591 (1961-04-01), Ringger
patent: 3048833 (1962-08-01), Bernheim
patent: 3401311 (1968-09-01), Burch
Miller J. D.
Schroeder L. C.
Tabet Manufacturing Company
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