Small fast acting conveyor toaster oven

Electric heating – Heating devices – Combined with container – enclosure – or support for material...

Reexamination Certificate

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C219S400000, C126S02100R

Reexamination Certificate

active

06252201

ABSTRACT:

This invention relates to conveyor ovens and, more particularly, to small ovens for toasting or warming bread or buns in very short time periods, with the flexibility of selectively warming either one or two sides if a food product.
For a general background of similar ovens, reference is made to U.S. Pat. Nos. 4,338,911; 4,386,558; 4,465,701; 4,534,987, and Canadian patent 1,161,269. In general, the invention is concerned with the air flow pattern in a toaster oven. In the inventive toaster oven, the air stream is described as flowing between two spaced parallel side walls in order to keep the side walls, bearings, etc. cool to the touch while utilizing any heat picked up during the air flow in this cooling process in order to augment heat applied to a food product by its primary heat source. The U.S. Pat. No. 4,338,911 relates to a columniated air flow where jets of hot air are blown onto a surface of a food product in order to both cook and produce surface effects thereon.
A second consideration is the cost and versatility of the oven. None of these cited patents addresses combining features such as cooling walls, heating a food product, for example, while concentrating and directing hot air onto the surface of the food product. Costs may be reduced by having a minimum number of parts, which serve multiple functions, such as toasting both side of a slice of bread or warming just the bottoms of buns.
In keeping with an aspect of the invention, these and other features may be accomplished by providing separately controlled upper and lower heaters in association with two spaced parallel plates forming an air flow member. One of these plates which confronts the food product has flared perforations that guide, direct, and concentrate a wash of hot air onto the surface of the food product. The space between the parallel plates is part of the air stream flow path, and provides an efficient flow path which is generally free of turbulence. The lower perforated plate also serves as a crumb tray.


REFERENCES:
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patent: 3895215 (1975-07-01), Gordon
patent: 4338911 (1982-07-01), Smith
patent: 4374319 (1983-02-01), Guibert
patent: 4386558 (1983-06-01), Holman et al.
patent: 4924763 (1990-05-01), Bingham
patent: 4951648 (1990-08-01), Shukla et al.
patent: 5454295 (1995-10-01), Cox et al.
patent: 5671660 (1997-09-01), Moshonas
patent: 5676044 (1997-10-01), Lara, Jr.
patent: 5832812 (1998-11-01), Wolfe et al.

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