Shutter control system

Details Shutter control system Shutter control system

1981-01-30

1983-08-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250209, G01J 120

Patent

active

043968317

ABSTRACT:
A skylight shutter is driven by a battery-powered d.c. motor through transistor switches operated by Schmitt triggers. A voltage dividing network derives the trigger signals by comparing the resistance of a photoresistor and a variable resistance, whose value determines the direction and degree the shutters are moved. A night sensor operates the Schmitt triggers independently of the remaining circuit for placing the shutters in a closed position to minimize radiation losses during evening hours.

REFERENCES:
patent: 3064131 (1962-11-01), Brown
patent: 3177367 (1965-04-01), Brown
patent: 3294152 (1966-12-01), Kuijvenhoven
patent: 3675023 (1972-07-01), Kunke et al.
patent: 3885152 (1975-05-01), Anetseder et al.
patent: 3917942 (1975-11-01), McCay

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