Timing control apparatus and circuit
First Claim
1. An electric toaster comprising:
- (A) a frame;
(B) at least one spring loaded rack for reception of bread to be toasted and being movable from an unloaded position to a loaded position against the force of a spring;
(C) a solid state control mounted on said frame and including(1) means for mechanically engaging said rack and holding said rack in loaded position including a normally inert AC solenoid with a spring loaded plunger normally urged to an extended position and movable to a retracted position upon activation of said timing means,(2) sensing and heat compensating means disposed on said frame,(3) timing means connected to said sensing and heat compensating means and adapted to release said means for mechanically holding said rack in loaded position upon attainment of a predetermined heat build up, and(4) trigger circuit means carried by said solid state control for recycling said timing means in response to failure of said means for holding said rack in loaded position.
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Accused Products
Abstract
A timing control apparatus and circuit for use in a toaster or other device, such as an oven, includes electronic solid-state circuitry including a thermistor operating in conjunction with a metal oxide semiconducter (CMOS) wherein when the predetermined voltage or heat buildup is attained, a condenser is charged to positive to activate the timing circuit, which, in turn, activates a SCR, shorting a full wave bridge to deactivate the heating elements and close a normally open solenoid, which unlocks a mechanical latch and permits the toast to be ejected. The device employs low operating current, expends no energy except at the moment of triggering the solenoid and is capable of being used as original equipment or to retrofit existing units.
32 Citations
6 Claims
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1. An electric toaster comprising:
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(A) a frame; (B) at least one spring loaded rack for reception of bread to be toasted and being movable from an unloaded position to a loaded position against the force of a spring; (C) a solid state control mounted on said frame and including (1) means for mechanically engaging said rack and holding said rack in loaded position including a normally inert AC solenoid with a spring loaded plunger normally urged to an extended position and movable to a retracted position upon activation of said timing means, (2) sensing and heat compensating means disposed on said frame, (3) timing means connected to said sensing and heat compensating means and adapted to release said means for mechanically holding said rack in loaded position upon attainment of a predetermined heat build up, and (4) trigger circuit means carried by said solid state control for recycling said timing means in response to failure of said means for holding said rack in loaded position. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification