US3689194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct burner ignition system
Assignee: Caloric Corp
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Filing: 1970-12-16
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Granted: 1972-09-05
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Expires: 1990-12-16
Abstract
Abstract An ignition system for burners, such as gas- or oil-fueled, which includes a novel switch device, an ignitor, a magnetic relay, and a thermocouple, with circuit means being provided which assures fail safe operation or discontinuance of the system in the event of malfunction of any one of various components of the system, thereby preventing possibly dangerous accumulation of fuel without proper ignition.
Inventors
- 👤 Nalini R Das
- 👤 Edwin H Strain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:01
CPC Classifications
F; F23; F23Q; F23Q3/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
144 words
A direct burner ignition system comprising electrically operable valve means for controlling flow of fuel to a burner, ignition means for igniting fuel at the burner and producing a resultant flame therefrom, and means for controlling the valve means in response to detection or non-detection of said flame, said last means comprising a thermocouple located within said flame when the flame exists, a safety switch connected to said valve means and including a heating element, a relay connected to a source of electrical energy in series with said heater element, the thermocouple being connected to said relay to operate the relay to break the circuit to said heater element in response to detection of said flame, and said switch being operable to shut off said valve means in the event the thermocouple does not detect a flame and consequently does not operate the relay.
Claim 2
Dependent Claim
144 words
A direct burner ignition system comprising electrically operable valve means for controlling flow of fuel to a burner, ignition means for igniting fuel at the burner and producing a resultant flame therefrom, and means for controlling the valve means in response to detection or non-detection of said flame, said last means comprising a thermocouple located within said flame when the flame exists, a safety switch connected to said valve means and including a heating element, a relay connected to a source of electrical energy in series with said heater element, the thermocouple being connected to said relay to operate the relay to break the circuit to said heater element in response to detection of said flame, and said switch being operable to shut off said valve means in the event the thermocouple does not detect a flame and consequently does not operate the relay.
Claim 3
Dependent Claim
111 words
A direct burner ignition system comprising electrically operable valve means for controlling fuel flow to a burner, ignition means for igniting fuel at the burner to produce a flame, thermostat means connected to Said ignition means for energizing and deenergizing the ignition means, flame detecting means for developing current when flame is detected, and safety means for deenergizing the valve means after a predetermined time period when no flame is detected, said safety means comprising a relay and a switch in series between the ignition means and the valve means, said relay having a pair of normally closed contacts, and said switch having a heater element connected to said relay contacts.
Claim 4
Dependent Claim
111 words
A direct burner ignition system comprising electrically operable valve means for controlling fuel flow to a burner, ignition means for igniting fuel at the burner to produce a flame, thermostat means connected to Said ignition means for energizing and deenergizing the ignition means, flame detecting means for developing current when flame is detected, and safety means for deenergizing the valve means after a predetermined time period when no flame is detected, said safety means comprising a relay and a switch in series between the ignition means and the valve means, said relay having a pair of normally closed contacts, and said switch having a heater element connected to said relay contacts.
Claim 5
Dependent Claim
59 words
A direct burner ignition system as set forth in claim 2 wherein said switch includes bimetallic means operable by heat from said heater element, a second pair of normally open contacts adapted to be closed upon operation of said bimetallic element, and means for completing a circuit through said second pair of contacts when closed to the valve means.
Claim 6
Dependent Claim
56 words
A direct burner ignition system as set forth in claim 2 wherein said switch includes bimetallic means operable by heat from said heater element, a first pair of normally open contacts adapted to be closed upon operation of said bimetallic means, and a second normally closed pair of contacts, completing a circuit to said valve means.
Claim 7
Dependent Claim
45 words
A direct burner ignition system as set forth in claim 4 wherein said relay includes switch means operable in response to said flame detecting means for opening the circuit to the switch heater element and for completing energization of the valve means through another circuit.
Claim 8
Dependent Claim
59 words
A direct burner ignition system as set forth in claim 4 wherein said bimetallic means comprises a movable member for initially closing said first pair of contacts when the heater element is operated and for subsequently opening the second pair of contacts at the end of a predetermined time interval and for thereby causing closure of said valve means.
Claim 9
Dependent Claim
69 words
A direct burner ignition system as set forth in claim 2 wherein said safety means further comprises a pair of second and third relays each including a heating element, the first relay being connected to said flame detecting means and having a pair of normally closed contacts in a series hookup with the heater elements of the second and third relays between the ignition means and the valve means.
Claim 10
Dependent Claim
51 words
A direct burner ignition system as set forth in claim 7 wherein said first relay includes switch means operable in response to said flame detecting means for opening the circuit to the heater elements of the second and third relays and for completing energization of the valve means through another circuit.
Claim 11
Dependent Claim
144 words
A direct burner ignition system comprising electrically operable valve means for controlling flow of fuel to a burner, ignition means for igniting fuel at the burner and producing a resultant flame therefrom, and means for controlling the valve means in response to detection or non-detection of said flame, said last means comprising flame sensing means located in proximity to said flame when the flame exists, a safety switch connected to said valve means, a relay connected to a source of electrical energy in series with said switch, the flame sensing means being connected to said relay to operate the relay to break the circuit to said heater element in response to detection of said flame, and said switch being operable to shut off said valve in the event the flame sensing means does not detect a flame and consequently does not operate the relay.
Claim 12
Dependent Claim
144 words
A direct burner ignition system comprising electrically operable valve means for controlling flow of fuel to a burner, ignition means for igniting fuel at the burner and producing a resultant flame therefrom, and means for controlling the valve means in response to detection or non-detection of said flame, said last means comprising flame sensing means located in proximity to said flame when the flame exists, a safety switch connected to said valve means, a relay connected to a source of electrical energy in series with said switch, the flame sensing means being connected to said relay to operate the relay to break the circuit to said heater element in response to detection of said flame, and said switch being operable to shut off said valve in the event the flame sensing means does not detect a flame and consequently does not operate the relay.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |