Electrically heated toaster
First Claim
1. Electrically heatable toaster comprising at least one bread holder movable into a toasting position, the bread holder being held in toasting position by an electromagnet, a tripping device for the electromagnet, the tripping device being actuated manually as well as electrically by a timing control, the timing control including a clock pulse actuated counting circuit the counting circuit being in connection with a frequency-determining charging capacitor chargeable for presetting the degree of toasting as well as a voltage divider, the voltage divider including a temperature-dependent resistor for compensating the influence of the toasting degree temperature and for triggering the electromagnet tripping device after a preset degree of toasting is reached, an oscillator with two complementary transistors (22, 23) combined in a programmable unijunction transistor circuit for operating the counting circuit (10), the transistors being connected on the input side to a charging current circuit of the frequency determining capacitor (24) and on the output side through a dividing point (20) of the voltage divider (16, 17, 19) with the temperature-dependent resistance (19) to a clock input (15) of the counting circuit (10) which switches a switch (8) in the current circuit of the electromagnet (6), the electromagnet being in effective connection with an actuating lever (43) for actuating the bread holder.
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Accused Products
Abstract
An electrically heatable toaster includes at least one bread holder which is held in toasting position by an electromagnet. The electromagnet has a tripping device which is actuated manually as well as electrically by a timing control. The timing control includes a clock pulse actuated counting circuit connected to a frequency-determining charging capacitor and a voltage divider. The voltage divider includes a temperature-dependent resistor for compensating the influence of the toasting degree temperature and for triggering the electromagnet tripping device after a preset degree of toasting is reached. An oscillator with two complementary transistors combined in a programmable unijunction transistor circuit operates the counting circuit. The transistors are connected on the input side to a charging current circuit of the frequency determining capacitor and on the output side through a dividing point of the voltage divider with the temperature-dependent resistance to a clock input of the counting circuit. The counting circuit switches a switch in the current circuit of the electromagnet. The electromagnet is in effective connection with an actuating lever for actuating the bread holder.
34 Citations
8 Claims
- 1. Electrically heatable toaster comprising at least one bread holder movable into a toasting position, the bread holder being held in toasting position by an electromagnet, a tripping device for the electromagnet, the tripping device being actuated manually as well as electrically by a timing control, the timing control including a clock pulse actuated counting circuit the counting circuit being in connection with a frequency-determining charging capacitor chargeable for presetting the degree of toasting as well as a voltage divider, the voltage divider including a temperature-dependent resistor for compensating the influence of the toasting degree temperature and for triggering the electromagnet tripping device after a preset degree of toasting is reached, an oscillator with two complementary transistors (22, 23) combined in a programmable unijunction transistor circuit for operating the counting circuit (10), the transistors being connected on the input side to a charging current circuit of the frequency determining capacitor (24) and on the output side through a dividing point (20) of the voltage divider (16, 17, 19) with the temperature-dependent resistance (19) to a clock input (15) of the counting circuit (10) which switches a switch (8) in the current circuit of the electromagnet (6), the electromagnet being in effective connection with an actuating lever (43) for actuating the bread holder.
Specification
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- Resources
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Current AssigneeRowenta-Werke GmbH
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Original AssigneeRowenta-Werke GmbH
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InventorsBirkert, Karl, Marburger, Heinz, Kullik, Gunter R.
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Primary Examiner(s)Simone, Timothy F.
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Application NumberUS07/427,848Time in Patent Office669 DaysField of Search99/326, 99/327, 99/329 R, 99/329 P, 99/329 RT, 99/334, 99/335, 99/385, 99/389, 99/390, 99/391, 99/393, 219/413, 219/492, 219/494, 219/497, 219/502, 219/505US Class Current99/327CPC Class CodesA47J 37/0842 with electronic timersG05D 23/1951 with control of the working...
