Patent US3801258A successfully refreshed from Google Patents.
US3801258A
Expired / Lapsed
US
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Post purge system for gas burners
Assignee: American Air Filter Co Inc
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Filing: 1972-12-20
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Granted: 1974-04-02
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Expires: 1992-12-20
Abstract
Abstract A post purge device for a fuel burning apparatus wherein a fuel pressure sensing means is disposed between and in communication with a main fuel line supplying fuel to a fuel burning apparatus and a diaphragm, the fuel pressure sensing means containing a fluid therein wherein movement of the fluid is determined by the pressure in the fuel line thereby causing movement of the diaphragm in response to the movement of the fluid, the diaphragm being in electrical communication with a combustion air blower wherein a predetermined amount of movement of the diaphragm controls the energization of the combustion air blower.
Inventors
- 👤 P Mutchler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:04
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/08; F23N1/085; F23N2227/00; F23N2227/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
A post purge device for a fuel burning apparatus comprising: a. a main fluid fuel line in communication with a fluid supply and a fuel burning apparatus; b. a fuel pressure sensing means disposed between said main fluid fuel line and a diaphragm means, said fuel pressure sensing means being a U-tube having two legs with a flow limiting device therein, one leg of said U-tube being in communication with said main fuel gas line and the second leg of said U-tube being in communication with said diaphragm means, said fuel pressure sensing means having a first fluid therein responsive to pressure in said fluid fuel line, said diaphragm means being operative in response to movement of said first fluid; and, c. a combustion air blower in electrical communicative relation with said diaphragm means.
Claim 2
Dependent Claim
134 words
A post purge device for a fuel burning apparatus comprising: a. a main fluid fuel line in communication with a fluid supply and a fuel burning apparatus; b. a fuel pressure sensing means disposed between said main fluid fuel line and a diaphragm means, said fuel pressure sensing means being a U-tube having two legs with a flow limiting device therein, one leg of said U-tube being in communication with said main fuel gas line and the second leg of said U-tube being in communication with said diaphragm means, said fuel pressure sensing means having a first fluid therein responsive to pressure in said fluid fuel line, said diaphragm means being operative in response to movement of said first fluid; and, c. a combustion air blower in electrical communicative relation with said diaphragm means.
Claim 3
Dependent Claim
45 words
The post purge device of claim 1, said first fluid being heavier than said fluid fuel, said U-tube having a second fluid in said second leg, said second fluid being lighter than said first fluid and disposed between said first fluid and said diaphragm means.
Claim 4
Dependent Claim
69 words
The post purge device of claim 2 wherein said diaphragm means includes a rod in communication with a normally open switch, said switch being in an electrical circuit which includes said combustion air blower whereby upward movement of said rod in response to said second fluid pressure closes said switch and decrease in said second fluid pressure releases said rod whereby said switch is moved to an open position.
Claim 5
Dependent Claim
24 words
The post purge device of claim 1 including means for maintaining said combustion air blower energized under preselected conditions independent of said diaphragm means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |