Patent US3610792A successfully refreshed from Google Patents.
US3610792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for gas apparatus
Assignee: LYON APPLIC CATALYTIQUES
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Filing: 1969-02-26
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Granted: 1971-10-05
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Expires: 1989-02-26
Abstract
Abstract A safety device for gas apparatus has a pilot flame at the base of a tube with a thermocouple close beside the flame. Spaced above the flame is a metal grill not reached by the flame when it burns in an atmosphere of normal composition. When the air has a high CO2 content the flame is displaced from the pilot nozzle and is lifted to the grill. The thermocouple therefore cools and actuates the closure of the gas supply to the apparatus. A gridded aperture in the base allows air to flow in past the thermocouple thereby aiding its cooling. A gridded aperture at the top of the tube allows the burned gases to escape. The device is especially useful in apparatus with catalytic burners.
Inventors
- 👤 Roger Risse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:17
CPC Classifications
F; F23; F23Q; F23Q9/00; B; B23; B23P; B23P17/00; F23N; F23N5/00; F23N5/02; F23N5/10; F23N5/107
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
222 words
A safety device for gas apparatus having gas supply closure means, said device comprising means defining a combustion chamber for a pilot flame, gas bypass means including a burner tip for supplying gaseous fuel for said pilot flame, said burner tip being located in a lower part of said combustion chamber, a thermosensitive element connected tO said closure means and arranged to laterally extend into said combustion chamber in immediate proximity of said burner tip so that it is exposed to the pilot flame, flame-retaining means arranged in said combustion chamber and spaced above the burner tip such that it is free from contact by the flame when the latter burns in an atmosphere of normal composition, said flame-retaining means being spaced proximate said flame and remote from said thermosensitive element such that when the CO2 level of the atmosphere increases, the flame is displaced by being detached from the burner tip to be caught on the flame-retaining means within the combustion chamber so that is spaced remote from the thermosensitive element which is thus subjected to reduced radiation so as to undergo cooling and actuate said closure means, said flame-retaining means being constructed so that the passages therethrough are of adequate cross section to enable said pilot flame to return to the burner tip when an atmosphere of normal composition resumes.
Claim 2
Dependent Claim
222 words
A safety device for gas apparatus having gas supply closure means, said device comprising means defining a combustion chamber for a pilot flame, gas bypass means including a burner tip for supplying gaseous fuel for said pilot flame, said burner tip being located in a lower part of said combustion chamber, a thermosensitive element connected tO said closure means and arranged to laterally extend into said combustion chamber in immediate proximity of said burner tip so that it is exposed to the pilot flame, flame-retaining means arranged in said combustion chamber and spaced above the burner tip such that it is free from contact by the flame when the latter burns in an atmosphere of normal composition, said flame-retaining means being spaced proximate said flame and remote from said thermosensitive element such that when the CO2 level of the atmosphere increases, the flame is displaced by being detached from the burner tip to be caught on the flame-retaining means within the combustion chamber so that is spaced remote from the thermosensitive element which is thus subjected to reduced radiation so as to undergo cooling and actuate said closure means, said flame-retaining means being constructed so that the passages therethrough are of adequate cross section to enable said pilot flame to return to the burner tip when an atmosphere of normal composition resumes.
Claim 3
Dependent Claim
14 words
A safety device according to claim 1, wherein the flame-retaining means is a grill.
Claim 4
Dependent Claim
18 words
A safety device according to claim 1, wherein said combustion chamber is in the form of a tube.
Claim 5
Dependent Claim
19 words
A safety device according to claim 1, wherein said combustion chamber has openings to the atmosphere which are grilled.
Claim 6
Dependent Claim
15 words
A safety device according to claim 1, wherein the thermosensitive element is a bulb thermostat.
Claim 7
Dependent Claim
16 words
A safety device according to claim 1, wherein gridded openings are provided in said combustion chamber.
Claim 8
Dependent Claim
84 words
A safety device according to claim 1, wherein an opening in said chamber to the atmosphere is provided on each side of the grill, one said opening being located in an upper part of the chamber to provide an outlet for burned gas and another said opening being located in the lower part of the chamber to enable air to flow into the chamber and pass over the thermosensitive element whereby it cools moore rapidly when the flame is displaced from the burner tip.
Claim 9
Dependent Claim
16 words
A catalytic heating apparatus including as a regulator a safety device as claimed in claim 1.
References Cited (Backward Citations)
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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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |