US3770408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annealing lehr
Assignee: Surface Combustion Corp
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Filing: 1971-11-15
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Granted: 1973-11-06
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Expires: 1991-11-15
Abstract
Abstract An endless belt conveyor annealing lehr having burner means located above the belt. The belt is foraminous and supported throughout the length of the lehr by a system of perforated plates. A shroud extends intermediate the walls of the lehr and a fan is located adjacent to the burner means outlet. This combination results in a continuous circulating atmosphere impinging directly upon the work being conveyed through the lehr. Means is also provided to control the temperature of the work throughout the length of the lehr, particularly at the entrance thereof.
Inventors
- 👤 Cully J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:21
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/30; F27B9/36; C; C03; C03B; C03B25/00; C03B25/04; C03B25/06; F27B9/06; F27B9/10; F27B9/14; F27B9/20; F27B9/24; F27B9/243; F27D; F27D7/00; F27D7/04; F27D2007/045; F27M; F27M2001/00; F27M2001/07; F27M2003/00; F27M2003/01; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/143
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
201 words
A lehr for heat treating in a continuous operation, comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, support means disposed along the length of the housing intermediate the roof and the floor, a foraminous belt received within the housing and supported along the length thereof by said support means, means for conveying the belt through said furnace, a plurality of longitudinally spaced fans received within the roof, a longitudinally extending shroud within the housing spaced relative to the roof and the sidE walls and terminating above the floor to define a plenum in combination with said side walls and roof and an opening in combination with said floor, said shroud having a plurality of openings which are aligned with said fans, a plurality of longitudinally spaced burners received within and extending into said housing, said burners being mounted in such a manner that the products of combustion are drawn into the circulating path generated by said fans, means for supplying fuel to said burners, means for sensing the temperature along the length of the furnace, and means for controlling the supply of fuel in response to the temperature sensing means.
Claim 2
Dependent Claim
201 words
A lehr for heat treating in a continuous operation, comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, support means disposed along the length of the housing intermediate the roof and the floor, a foraminous belt received within the housing and supported along the length thereof by said support means, means for conveying the belt through said furnace, a plurality of longitudinally spaced fans received within the roof, a longitudinally extending shroud within the housing spaced relative to the roof and the sidE walls and terminating above the floor to define a plenum in combination with said side walls and roof and an opening in combination with said floor, said shroud having a plurality of openings which are aligned with said fans, a plurality of longitudinally spaced burners received within and extending into said housing, said burners being mounted in such a manner that the products of combustion are drawn into the circulating path generated by said fans, means for supplying fuel to said burners, means for sensing the temperature along the length of the furnace, and means for controlling the supply of fuel in response to the temperature sensing means.
Claim 3
Dependent Claim
13 words
The lehr of claim 1 wherein said support means is a perforated plate.
Claim 4
Dependent Claim
16 words
The lehr of claim 1 wherein said burners are located at the locations of said fans.
Claim 5
Dependent Claim
189 words
A lehr for heat treating of work in a continuous operation, comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, a longitudinally extending, porous plate received within said housing, an endless foraminous belt supported by said plate, means for conveying said belt along said plate, a plurality of longitudinally spaced fans received within said roof, a shroud extending within the length of the housing spaced relative to the roof and side walls to define a plenum therebetween, said shroud terminating at approximately the location of said plate to define an opening therebetween, said shroud having an opening at each location of said fans, a plurality of longitudinally spaced burners received within one of said side walls and extending intermediate said belt and said fans, said burners being mounted in such a manner that the products of combustion are drawn into the circulating path generated by said fans, means for supplying fuel to said burners, means for sensing the temperature along the length of said housing, and means for supplying fuel to said burners in response to said sensing means.
Claim 6
Dependent Claim
189 words
A lehr for heat treating of work in a continuous operation, comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, a longitudinally extending, porous plate received within said housing, an endless foraminous belt supported by said plate, means for conveying said belt along said plate, a plurality of longitudinally spaced fans received within said roof, a shroud extending within the length of the housing spaced relative to the roof and side walls to define a plenum therebetween, said shroud terminating at approximately the location of said plate to define an opening therebetween, said shroud having an opening at each location of said fans, a plurality of longitudinally spaced burners received within one of said side walls and extending intermediate said belt and said fans, said burners being mounted in such a manner that the products of combustion are drawn into the circulating path generated by said fans, means for supplying fuel to said burners, means for sensing the temperature along the length of said housing, and means for supplying fuel to said burners in response to said sensing means.
Claim 7
Dependent Claim
12 words
The lehr of claim 4 wherein said burners are ported tube burners.
Claim 8
Dependent Claim
218 words
A lehr for heat treating in a continuous operation, comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, support means disposed along the length of the housing intermediate the roof and the floor, a foraminous belt received within the housing and supported along the length thereof by said support means, means for conveying the belt through said housing, a plurality of spaced fans received within the roof, a longitudinally extending shroud within the housing spaced relative to the roof and the side walls and terminating above the floor to define a plenum in combination with said side walls and roof and an opening in combination with said floor, said shroud having a first plurality of openings which are aligned with said fans and a second plurality of openings, a plurality of longitudinally spaced burners received within said roof and extending into said housing and said shroud through said second plurality of openings, said burners being mounted in such a manner that the products of combustion are drawn into the circulating path generated by said fans, means for supplying fuel to said burners, means for sensing the temperature along the length of the furnace, and means for controlling the supply of fuel in response to the temperature sensing means.
Claim 9
Dependent Claim
218 words
A lehr for heat treating in a continuous operation, comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, support means disposed along the length of the housing intermediate the roof and the floor, a foraminous belt received within the housing and supported along the length thereof by said support means, means for conveying the belt through said housing, a plurality of spaced fans received within the roof, a longitudinally extending shroud within the housing spaced relative to the roof and the side walls and terminating above the floor to define a plenum in combination with said side walls and roof and an opening in combination with said floor, said shroud having a first plurality of openings which are aligned with said fans and a second plurality of openings, a plurality of longitudinally spaced burners received within said roof and extending into said housing and said shroud through said second plurality of openings, said burners being mounted in such a manner that the products of combustion are drawn into the circulating path generated by said fans, means for supplying fuel to said burners, means for sensing the temperature along the length of the furnace, and means for controlling the supply of fuel in response to the temperature sensing means.
Claim 10
Dependent Claim
13 words
The lehr of claim 6 wherein said support means is a perforated plate.
Claim 11
Dependent Claim
201 words
A lehr for heat treating work in a continuous operation, comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, a longitudinally extending, porous plate received within said housing, an endless foraminous belt supported by said plate, means for conveying said belt along said plate, a plurality of longitudinally spaced fans received within said roof, a shroud extending within the length of the housing spaced relative to the roof and side walls to define a plenum therebetween, said shroud terminating at apProximately the location of said plate to define an opening therebetween, said shroud having a first series of openings at each location of said fans, a plurality of longitudinally spaced combustors received within said roof and operative to direct combusting gases downwardly, said shroud having a second series of openings at each location of said combustor, a shoe located beneath each combustor having means to deflect gases from the combustor horizontally into the circulating path generated by said fans, means for supplying fuel to said combustors, means for sensing the temperature along the length of said housing, and means for supplying fuel to said combustors in response to said sensing means.
Claim 12
Dependent Claim
201 words
A lehr for heat treating work in a continuous operation, comprising: an elongated housing having a roof, spaced side walls, a floor, an entrance opening and an exit opening, a longitudinally extending, porous plate received within said housing, an endless foraminous belt supported by said plate, means for conveying said belt along said plate, a plurality of longitudinally spaced fans received within said roof, a shroud extending within the length of the housing spaced relative to the roof and side walls to define a plenum therebetween, said shroud terminating at apProximately the location of said plate to define an opening therebetween, said shroud having a first series of openings at each location of said fans, a plurality of longitudinally spaced combustors received within said roof and operative to direct combusting gases downwardly, said shroud having a second series of openings at each location of said combustor, a shoe located beneath each combustor having means to deflect gases from the combustor horizontally into the circulating path generated by said fans, means for supplying fuel to said combustors, means for sensing the temperature along the length of said housing, and means for supplying fuel to said combustors in response to said sensing means.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |