Patent US3681569A successfully refreshed from Google Patents.
US3681569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat control system
Assignee: Hercules Galion Products Inc
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Filing: 1967-12-22
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Granted: 1972-08-01
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Expires: 1987-12-22
Abstract
Abstract A novel method of and a novel unit for controlling the heat input and the operating temperature of an electric heating element, such as those of an electric broiler, or the like, the method including cyclically alternately supplying full current and a predetermined less amount of current to such electric heating element, the unit comprising an adjustable proportionate timer and a diode electrically connected between the electric element and a power supply to accomplish said method.
Inventors
- 👤 John F Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:42
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0202; H05B1/0208
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
235 words
The method of controlling the heat input and the operating temperature of an electric heating element of an electric broiler and the like comprising the steps of supplying full line alternating current to such electric heating element for a predetermined period of time, then supplying a predetermined percentage of said line current to such electric heating element for a predetermined period of time by changing the path of flow of said current to the electric heating element and passing said current through a diode ahead of said electric heating element by moving a proportionate timer switch from one operative position shunting the diode to a second operative position passing said current through the diode by means of a temperature sensing means actuated by heating means in a line shunted across the power supply ahead of said heating element having a heating phase and a cooling phase, specifically, by permitting the temperature sensing means to cool to move the proportionate timer switch from diode shunting position to position passing said current therethrough and to energize the heating means, then heating the temperature sensing means to move the proportionate timer switch back to diode shunting position and to deenergize the heating means to supply full current to the heating element, and thereafter cyclically alternately repeating said steps thereby to control the heat input and the operating temperature of such electric heating element substantially independently of surrounding temperatures.
Claim 2
Independent Claim
235 words
The method of controlling the heat input and the operating temperature of an electric heating element of an electric broiler and the like comprising the steps of supplying full line alternating current to such electric heating element for a predetermined period of time, then supplying a predetermined percentage of said line current to such electric heating element for a predetermined period of time by changing the path of flow of said current to the electric heating element and passing said current through a diode ahead of said electric heating element by moving a proportionate timer switch from one operative position shunting the diode to a second operative position passing said current through the diode by means of a temperature sensing means actuated by heating means in a line shunted across the power supply ahead of said heating element having a heating phase and a cooling phase, specifically, by permitting the temperature sensing means to cool to move the proportionate timer switch from diode shunting position to position passing said current therethrough and to energize the heating means, then heating the temperature sensing means to move the proportionate timer switch back to diode shunting position and to deenergize the heating means to supply full current to the heating element, and thereafter cyclically alternately repeating said steps thereby to control the heat input and the operating temperature of such electric heating element substantially independently of surrounding temperatures.
Claim 3
Dependent Claim
25 words
The method of claim 1 in which the step of supplying a predetermined percentage of line current is the supplying of substantially half line current.
Claim 4
Dependent Claim
25 words
The method of claim 1 and including the preliminary step of establishing the time duration of each heating step prior to initiation of the cycle.
Claim 5
Dependent Claim
25 words
The method of claim 2 and including the preliminary step of establishing the time duration of each heating step prior to initiation of the cycle.
Claim 6
Dependent Claim
176 words
In combination with an electric heating element of an electric broiler, a unit for controlling the heat input and the operating temperature of said electric heating element comprising a proportionate timer having a switch having two operative positions of movement, a diode, means electrically connecting said proportionate timer, said diode, and said electric heating element to cyclically alternately supply full line alternating current and substantially half line alternating current To such electric heating element, and a temperature sensing means having heating means shunted directly across the power supply, said switch being operated by the said sensing means to disconnect said shunted heating means and to short circuit said diode, said diode being in series with said electric heating element in one position of movement of said switch to supply said substantially half line current to said electric heating element and being shunted out of said electric heating element circuit in the other position of movement of said switch, said switch in said other position of movement connecting said electric heating element to said full line current.
Claim 7
Dependent Claim
176 words
In combination with an electric heating element of an electric broiler, a unit for controlling the heat input and the operating temperature of said electric heating element comprising a proportionate timer having a switch having two operative positions of movement, a diode, means electrically connecting said proportionate timer, said diode, and said electric heating element to cyclically alternately supply full line alternating current and substantially half line alternating current To such electric heating element, and a temperature sensing means having heating means shunted directly across the power supply, said switch being operated by the said sensing means to disconnect said shunted heating means and to short circuit said diode, said diode being in series with said electric heating element in one position of movement of said switch to supply said substantially half line current to said electric heating element and being shunted out of said electric heating element circuit in the other position of movement of said switch, said switch in said other position of movement connecting said electric heating element to said full line current.
Claim 8
Dependent Claim
28 words
The combination of claim 5 in which said proportionate timer is adjustable to vary the time of full current and of half current to said electric heating element.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |