US3719180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for heat treatment by way of forced gas convection, forming a bakery, pastry, pork-butchery oven or the like
Assignee: CAPIC CAILLAREC Ets
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Filing: 1971-02-01
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Granted: 1973-03-06
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Expires: 1991-02-01
Abstract
Abstract A device for heat treatment comprising a muffle, heating means, a fan and a treatment chamber limited on one of its sides by an inner wall of the muffle, the cross-sections of said chamber having the shape of trapezia, the larger base of which is located on the fan side of the device. The heating means are constituted by at least one gas burner. The device comprises a casing forming a heat exchanging element surrounding said heating means and being placed within the hot gases circulating in the muffle.
Inventors
- 👤 F Pere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:43
CPC Classifications
A; A21; A21B; A21B1/00; A21B1/02; A21B1/24; A21B1/26; A21B1/28; F; F24; F24C; F24C15/00; F24C15/32; F24C15/322
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
387 words
In a gas-fired, forced-air convection heating device for food-stuffs, a muffle having a front wall provided with a door, a rear wall opposite said front wall, opposed side walls extending between said front and rear walls and connected thereto, and top and bottom walls extending between and connected to the remaining walls, said muffle having a vertical medial Plane situated midway between and being parallel to said side walls, said top and rear walls of said muffle forming a pair of walls which with said opposed side walls and said bottom and front walls define an interior treatment chamber which in a plane normal to said medial plane is of trapezoidal configuration on each side of said medial plane, at least one fan situated in close proximity to and carried by one of said pair of muffle walls, in said medial plane with the interior space of trapezoidal configuration on each side of said medial plane in said plane normal to the latter having its largest base situated in the region of said fan, an an inner wall situated adjacent that one of said pair of walls which carries said fan with the latter situated between said inner wall and said one of said pair of walls, said inner wall being formed with an opening in alignment with said fan, and heating means for heating the interior of said muffle, said heating means comprising a gas burner and a casing extending at least partly around said gas burner, forming an extension of said inner wall, and having a heat-exchanging relationship with the interior of said muffle for transferring heat from said burner to the interior of said muffle for generating in the latter hot gases circulated by said fan through said opening of said inner wall into the space between the latter and said one of said pair of muffle walls, said casing having elongated side portions situated adjacent but spaced from said side walls to define with the latter a pair of elongated gaps through which the hot gases flow from the space between said inner wall and said one of said pair of walls into an interior treating portion of said treatment chamber situated on the side of said inner wall opposite from said fan and in which the food-stuffs are located to be treated.
Claim 2
Dependent Claim
387 words
In a gas-fired, forced-air convection heating device for food-stuffs, a muffle having a front wall provided with a door, a rear wall opposite said front wall, opposed side walls extending between said front and rear walls and connected thereto, and top and bottom walls extending between and connected to the remaining walls, said muffle having a vertical medial Plane situated midway between and being parallel to said side walls, said top and rear walls of said muffle forming a pair of walls which with said opposed side walls and said bottom and front walls define an interior treatment chamber which in a plane normal to said medial plane is of trapezoidal configuration on each side of said medial plane, at least one fan situated in close proximity to and carried by one of said pair of muffle walls, in said medial plane with the interior space of trapezoidal configuration on each side of said medial plane in said plane normal to the latter having its largest base situated in the region of said fan, an an inner wall situated adjacent that one of said pair of walls which carries said fan with the latter situated between said inner wall and said one of said pair of walls, said inner wall being formed with an opening in alignment with said fan, and heating means for heating the interior of said muffle, said heating means comprising a gas burner and a casing extending at least partly around said gas burner, forming an extension of said inner wall, and having a heat-exchanging relationship with the interior of said muffle for transferring heat from said burner to the interior of said muffle for generating in the latter hot gases circulated by said fan through said opening of said inner wall into the space between the latter and said one of said pair of muffle walls, said casing having elongated side portions situated adjacent but spaced from said side walls to define with the latter a pair of elongated gaps through which the hot gases flow from the space between said inner wall and said one of said pair of walls into an interior treating portion of said treatment chamber situated on the side of said inner wall opposite from said fan and in which the food-stuffs are located to be treated.
Claim 3
Dependent Claim
387 words
In a gas-fired, forced-air convection heating device for food-stuffs, a muffle having a front wall provided with a door, a rear wall opposite said front wall, opposed side walls extending between said front and rear walls and connected thereto, and top and bottom walls extending between and connected to the remaining walls, said muffle having a vertical medial Plane situated midway between and being parallel to said side walls, said top and rear walls of said muffle forming a pair of walls which with said opposed side walls and said bottom and front walls define an interior treatment chamber which in a plane normal to said medial plane is of trapezoidal configuration on each side of said medial plane, at least one fan situated in close proximity to and carried by one of said pair of muffle walls, in said medial plane with the interior space of trapezoidal configuration on each side of said medial plane in said plane normal to the latter having its largest base situated in the region of said fan, an an inner wall situated adjacent that one of said pair of walls which carries said fan with the latter situated between said inner wall and said one of said pair of walls, said inner wall being formed with an opening in alignment with said fan, and heating means for heating the interior of said muffle, said heating means comprising a gas burner and a casing extending at least partly around said gas burner, forming an extension of said inner wall, and having a heat-exchanging relationship with the interior of said muffle for transferring heat from said burner to the interior of said muffle for generating in the latter hot gases circulated by said fan through said opening of said inner wall into the space between the latter and said one of said pair of muffle walls, said casing having elongated side portions situated adjacent but spaced from said side walls to define with the latter a pair of elongated gaps through which the hot gases flow from the space between said inner wall and said one of said pair of walls into an interior treating portion of said treatment chamber situated on the side of said inner wall opposite from said fan and in which the food-stuffs are located to be treated.
Claim 4
Dependent Claim
387 words
In a gas-fired, forced-air convection heating device for food-stuffs, a muffle having a front wall provided with a door, a rear wall opposite said front wall, opposed side walls extending between said front and rear walls and connected thereto, and top and bottom walls extending between and connected to the remaining walls, said muffle having a vertical medial Plane situated midway between and being parallel to said side walls, said top and rear walls of said muffle forming a pair of walls which with said opposed side walls and said bottom and front walls define an interior treatment chamber which in a plane normal to said medial plane is of trapezoidal configuration on each side of said medial plane, at least one fan situated in close proximity to and carried by one of said pair of muffle walls, in said medial plane with the interior space of trapezoidal configuration on each side of said medial plane in said plane normal to the latter having its largest base situated in the region of said fan, an an inner wall situated adjacent that one of said pair of walls which carries said fan with the latter situated between said inner wall and said one of said pair of walls, said inner wall being formed with an opening in alignment with said fan, and heating means for heating the interior of said muffle, said heating means comprising a gas burner and a casing extending at least partly around said gas burner, forming an extension of said inner wall, and having a heat-exchanging relationship with the interior of said muffle for transferring heat from said burner to the interior of said muffle for generating in the latter hot gases circulated by said fan through said opening of said inner wall into the space between the latter and said one of said pair of muffle walls, said casing having elongated side portions situated adjacent but spaced from said side walls to define with the latter a pair of elongated gaps through which the hot gases flow from the space between said inner wall and said one of said pair of walls into an interior treating portion of said treatment chamber situated on the side of said inner wall opposite from said fan and in which the food-stuffs are located to be treated.
Claim 5
Dependent Claim
235 words
The combination of claim 1 and wherein said one of said pair of walls is said rear wall of said muffle, said inner wall being situated in front of said rear wall and being in the form of a metal sheet, said casing including a front metal sheet situated forwardly of said inner wall and having a pair of opposed vertical side edges, said inner wall also having a pair of opposed vertical side edges respectively fixed with said opposed vertical side edges of said front metal sheet, and defining with said opposed side walls of said muffle said gaps through which the hot gases flow, at least one of said metal sheets having a rounded configuration and said casing having a lower interior region in which said burner is located, and a chimney connected to an upper portion of said casing and communicating with the interior thereof, and a circular wall defining an air channel, extending between and connected to said inner wall and front metal sheet, the latter being formed with an opening aligned with said opening of said inner wall so that said circular wall defines an air channel for flow of air through the latter channel toward said fan, so that said channel has a rear end communicating with the space between said inner wall and rear wall and a front end communicating with said treating portion of said treatment chamber.
Claim 6
Dependent Claim
32 words
The combination of claim 2 and wherein a supporting means for supporting food-stuffs is located in said treating portion of said treatment chamber and is in the form of a removable trolley.
Claim 7
Dependent Claim
66 words
The combination of claim 2 and including a means for supplying primary air, the latter means including at least one air duct having an elongated section embedded in one of said side walls and a relatively short section extending between said elongated section and said casing, communicating with the interior of the latter in the region of said burner for supplying primary air to the latter.
Claim 8
Dependent Claim
43 words
The combination of claim 2 and wherein said circular wall extending between said front sheet metal wall and said inner wall and defining said channel is itself formed with openings providing communication between the interior of said casing and the inteRior treatment chamber.
Claim 9
Dependent Claim
43 words
The combination of claim 2 and wherein said inner wall is provided at its surface which is directed toward said rear wall with a plurality of elongated horizontal ribs which improve the heat-exchanging relation between said casing and the interior of the muffle.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |