PHOTOELECTRIC CONTROLLED DISPENSER
First Claim
1. A material dispenser comprising two photocells adapted to be connected in series across a DC power source and forming a variable voltage divider, a silicon-controlled rectifier responsive to current coming directly from said variable voltage divider, means responsive to current from said silicon-controlled rectifier for dispensing material, and turnoff means for ceasing operation of the dispensing means.
1 Assignment
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Accused Products
Abstract
A device is disclosed for dispensing materials such as detergents without manual control. It is operated by blocking the passage of light to one of two photoelectric cells, as by a hand, which actuates an SCR circuit. The pump is turned off automatically preferably by a pulse generating circuit which interrupts the SCR. The two photocells are connected in series and together function as a voltage divider, comparing ambient light to proximate light.
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Citations
3 Claims
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1. A material dispenser comprising two photocells adapted to be connected in series across a DC power source and forming a variable voltage divider, a silicon-controlled rectifier responsive to current coming directly from said variable voltage divider, means responsive to current from said silicon-controlled rectifier for dispensing material, and turnoff means for ceasing operation of the dispensing means.
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2. Dispenser of claim 1 in which the turnoff means comprise a capacitor-actuated unijunction transistor and a silicon-controlled rectifier responsive thereto.
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3. Dispenser of claim 1 in which the means responsive to current from the silicon-controlled rectifier is a pump.
Specification