US4252055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunnel-chamber baking oven
Assignee: TIPE REVEN AB
•
Filing: 1979-06-08
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Granted: 1981-02-24
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Expires: 1999-06-08
Abstract
Abstract A baking oven includes a thermally insulated casing that defines a tunnel-chamber through which an endless conveyor belt extends. The reversing elements at the end of the conveyor belt are supported by brackets that can tilt upwardly to shorten the effective length of the oven for shipment and, with the upper portion of the casing removed, to enable slackening of the conveyor belt, thereby facilitating manual raising of the central portion thereof for cleaning structure lying therebelow. The top of the casing serves as a countertop for preparing food, and the tunnel-chamber and conveyor belt lie therebelow thus conserving floor space.
Inventors
- 👤 Leif A. T. Johansson
- 👤 Nils G. Pers
- 👤 Staffan Lundgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:17
CPC Classifications
A; A21; A21B; A21B1/00; A21B1/02; A21B1/24; A21B1/245; A21B1/42; A21B1/48; A47; A47J; A47J37/00; A47J37/04; A47J37/044
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A tunnel-chamber baking oven adapted to be heated by hot air circulating through a substantially closed circuit, said oven comprising: (a) a thermally insulated casing encircling the oven tunnel-chamber, and having an inlet and an outlet therein; (b) an endless motor-driven conveyor belt having an upper flight for supporting goods to be baked, and a lower return flight, said flight's extending between a first reversing element upstream of said inlet, through said tunnel-chamber, and a second reversing element downstream of said outlet; (c) a pair of brackets pivotally supported as cantilevers on opposite ends of said casing for pivoting about a horizontal axis through an angle of 90° and respectively supporting said reversing elements for rotation about other horizontal axes.
Claim 2
Dependent Claim
120 words
A tunnel-chamber baking oven adapted to be heated by hot air circulating through a substantially closed circuit, said oven comprising: (a) a thermally insulated casing encircling the oven tunnel-chamber, and having an inlet and an outlet therein; (b) an endless motor-driven conveyor belt having an upper flight for supporting goods to be baked, and a lower return flight, said flight's extending between a first reversing element upstream of said inlet, through said tunnel-chamber, and a second reversing element downstream of said outlet; (c) a pair of brackets pivotally supported as cantilevers on opposite ends of said casing for pivoting about a horizontal axis through an angle of 90° and respectively supporting said reversing elements for rotation about other horizontal axes.
Claim 3
Dependent Claim
23 words
An oven according to claim 1, the pivotal axes of said brackets being disposed immediately adjacent to said inlet and said outlet, respectively.
Claim 4
Dependent Claim
29 words
An oven according to claim 1, said casing comprising separable upper and lower portions latched together by manual latches, said upper portion normally being disposed above the tunnel chamber.
Claim 5
Dependent Claim
42 words
An oven according to claim 3, said upper flight of said conveyor belt being free of obstructions and thereby enabled to be freely lifted in response to removal of said upper casing and upward pivoting of at least one of said brackets.
Claim 6
Dependent Claim
64 words
An oven according to claim 4, said lower casing portion having a manually removable apertured hearth normally defining the apertured floor of the tunnel chamber, and being disposed between said flights, said hearth being enabled to be freely removed in response to said upper flight's being lifted, and said lower flight being enabled to be freely lifted in response to removal of said hearth.
Claim 7
Dependent Claim
14 words
An oven according to claim 5, said hearth comprising a plurality of sheet-like segments.
Claim 8
Dependent Claim
43 words
An oven according to claim 3, including a plurality of rod-like handles secured to said upper portion, each said handle being axially slideable in a direction parallel to the axes of said reversing elements into said upper portion to a substantially nonprojecting position.
Claim 9
Dependent Claim
31 words
An oven according to claim 1, said casing having a substantially smooth horizontal obstruction-free upper side located above the insulation at a height enabling it to be used as a countertop.
Claim 10
Dependent Claim
17 words
An oven according to claim 8, including a food-preparation sheet removably positioned flatwise on said upper side.
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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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |