US4072268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating control system
Assignee: JAMES PERRIS CO Inc
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Filing: 1976-04-14
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Granted: 1978-02-07
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Expires: 1996-04-14
Abstract
Abstract A heating control system for automatically controlling the temperature within a space is provided. The heating control system includes a temperature sensor for detecting changes in temperature without the space and in response thereto producing a control signal having a substantially linearly variable potential, the increase or decrease in the variable potential being directly varied in response to changes in temperature without the space. A heat supply includes a control valve adapted to be selectively opened to increase the rate at which heat is supplied to the space and be selectively closed to decrease the rate at which the heat is supplied to the space. A rheostat having a shiftable contact is coupled to the control valve and is disposably controlled thereby to produce a variable reference feedback signal having a substantially linearly variable potential in response to the selective opening and closing of the control valve. Comparator circuitry compares the potential of the variable control signal to the potential of the variable reference feedback signal and in response to the potential of the variable control signal being greater than the potential of the variable reference signal applies a closing signal to the control valve to effect decreasing of the rate at which same supplies heat to the space and in response to the potential of the control signal being below the variable reference potential applies an opening signal to the control valve to decrease the set rate of heat supplied to the space.
Inventors
- 👤 James Perris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:32
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
270 words
A heating control system for automatically controlling the temperature within a space comprising in combination; temperature sensing means for detecting changes in temperature without the space and in response thereto, producing a control signal having a substantially linearly variable potential, the increase or decrease in potential being linearly varied in response to changes in temperature without the space; heat supply means for supplying heat to the space at a set rate including control valve means adapted to be selectively opened to increase the set rate at which heat is supplied to the space and selectively closed to decrease the set rate at which heat is supplied to the space; rheostat means including a movable contact means coupled to said control valve means and disposably controlled thereby to produce a reference feedback signal having a linearly variable potential, said potential being linearly varied in response to the selective opening and closing of said control valve; comparator means for comparing the potential of said variable control signal to the potential of said variable reference feedback signal, said comparator means in response to the potential of said variable control signal being greater than the potential of said variable reference signal being adapted to apply a closing signal to said control valve means to effect decreasing of the rate at which same supplies heat to the space, said comparator means being further adapted in response to the potential of said control signal being less than said reference potential to apply an opening signal to said control valve means to effect an increase in the set rate at which heat is supplied to the space.
Claim 2
Dependent Claim
270 words
A heating control system for automatically controlling the temperature within a space comprising in combination; temperature sensing means for detecting changes in temperature without the space and in response thereto, producing a control signal having a substantially linearly variable potential, the increase or decrease in potential being linearly varied in response to changes in temperature without the space; heat supply means for supplying heat to the space at a set rate including control valve means adapted to be selectively opened to increase the set rate at which heat is supplied to the space and selectively closed to decrease the set rate at which heat is supplied to the space; rheostat means including a movable contact means coupled to said control valve means and disposably controlled thereby to produce a reference feedback signal having a linearly variable potential, said potential being linearly varied in response to the selective opening and closing of said control valve; comparator means for comparing the potential of said variable control signal to the potential of said variable reference feedback signal, said comparator means in response to the potential of said variable control signal being greater than the potential of said variable reference signal being adapted to apply a closing signal to said control valve means to effect decreasing of the rate at which same supplies heat to the space, said comparator means being further adapted in response to the potential of said control signal being less than said reference potential to apply an opening signal to said control valve means to effect an increase in the set rate at which heat is supplied to the space.
Claim 3
Dependent Claim
26 words
A heating control system as claimed in claim 1, wherein said temperature sensing means and said rheostat means have an equivalent substantially linearly variable impedance characteristic.
Claim 4
Dependent Claim
45 words
A heating control system as claimed in claim 1, wherein said temperature sensing means includes a thermistor and means for biasing said thermistor to effect a linearly variable change in the impedance of said thermistor in response to corresponding changes in the temperature sensed thereby.
Claim 5
Dependent Claim
48 words
A heating control system as claimed in claim 3, wherein said movable contact of said rheostat means is adapted to linearly vary the impedance thereof by an amount corresponding to the change in the substantially linearly variable impedance of the thermistor when same detects a change of temperature.
Claim 6
Dependent Claim
46 words
A heating control system as claimed in claim 1, wherein said comparator means includes operational amplifier means selectively disposable into a null combination for producing a predetermined potential output in response to the potential of said reference feedback signal and said control signal being substantially equivalent.
Claim 7
Dependent Claim
34 words
A heating control system as claimed in claim 5, wherein said operational amplifier means includes compensator means for selecting the output potential of said operational amplifier means to dispose same at a null condition.
Claim 8
Dependent Claim
156 words
A heating control system as claimed in claim 5, wherein said comparator means includes first and second comparators coupled to the output of said operational amplifier means, sais first comparator being adapted to detect when the output potential of said operational amplifier means is above the predetermined null condition potential and in response thereto produce a closing control signal, said second comparator being adapted to detect when the output potential of said operational amplifier means is below the predetermined null condition potential and in response thereto produce an opening control signal and circuit means intermediate said first and second comparators for respectively receiving said first opening control signal and closing control signal produced by said first and second comparators and in response thereto apply a closing signal to said control valve means in response to said closing control signal and apply an opening signal to said control valve means in response to said opening control signal.
Claim 9
Dependent Claim
94 words
A heating control system as claimed in claim 7, wherein said circuit means includes first and second power control means respectively coupled to said first and second comparator means, said first control means being adapted to receive said closing control signal in response thereto apply a closing control signal to said control valve means, said second control means being adapted to apply a closing signal to said control valve means, said second control means being adapted to receive said opening control signal in response thereto apply an opening signal to said control valve means.
Claim 10
Dependent Claim
19 words
A heating control system as claimed in claim 8, wherein said first and second power control means are triacs.
Claim 11
Dependent Claim
78 words
A heating control system as claimed in claim 8, and including first and second light indicating means, said first light indicating means being disposed intermediate said first comparator and first power control means for indicating the application of a closing control signal to said power control means, said second light indicating means being coupled intermediate said second comparator and second power control means for indicating the application of an open control signal to said second power control means.
Claim 12
Dependent Claim
88 words
A heating control system as claimed in claim 1, and including timing means coupled to said comparator means, said timing means permitting said comparator means to compare the potential of said variable control signal to the potential of said variable reference signal for a first predetermined interval of time and preventing said comparator means from comparing the potential of said variable control signal to the potential of said variable reference feedback signal for a second interval of time to thereby define a timing cycle for the comparator means.
Claim 13
Dependent Claim
96 words
A heating control system as claimed in claim 11, and including potential supply means for supplying an energizing potential, said timing means being disposed intermediate said supply means and said comparator means for selectively applying said energizing potential to permit said comparator means to compare the potential of said variable control signal to the potential of said variable reference feedback signal and for preventing application of said energizing signal to said comparator means to prevent the comparator means from comparing the potential of said variable control signal to the potential of said variable reference feedback signal.
Claim 14
Dependent Claim
94 words
A heating control system as claimed in claim 12, wherein said timing means includes a transistor switching means disposed intermediate said supply means and said comparator means, and a timer coupled to said switching transistor means for cyclically opening and closing said transistor switching means for a first interval of time and second interval of time respectively to thereby selectively couple said supply means to said comparator means for said first interval of time during each cycle isolate said supply means from said comparator means for a second interval of time during each cycle.
Claim 15
Dependent Claim
69 words
A heating control system as claimed in claim 1, and including override circuit means adapted to be selectively coupled in parallel with said temperature sensing means to thereby substantially reduce the potential of said control signal with respect to said reference signal to effect an application of said closing signal to said control valve means to effect decreasing of the rate at which heat is supplied to the space.
Claim 16
Dependent Claim
58 words
A heating control system as claimed in claim 14, wherein said override means include a manually operated switch in series with a resistor, operation of said manually operated switch effecting a parallel connection of said resistor and said temperature sensing means to thereby reduce the substantially linearly variable potential of the control signal applied to the comparator means.
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |