Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1984-04-16
1986-12-02
Goldberg, E. A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
99447, 99443C, 219388, F27B 910
Patent
active
046266615
ABSTRACT:
An improved air delivery system is provided for an impingement food preparation oven including a plurality of air ducts disposed in a cooking chamber, a plenum connected to the air ducts, and a scoop-type fan disposed in a backwall opening of the plenum to provide a flow of heated air smoothly and uniformly through the plenum into the air ducts. The fan device includes a plurality of tear-drop shaped blades, wherein each blade has a leading edge portion that tapers to a point in the direction of rotation and a trailing row portion at a given pitch angle for forcibly moving the flow of air in an axial direction toward the plenum front wall. The plenum front wall has a plurality of openings connected to the duct members, and a multi-tapering surface tapering from the front wall openings inwardly of the plenum toward the fan, whereby the axially directed flow of heated air from the fan is smoothly and uniformly directed by the multi-tapering surface to the plurality of air ducts, thereby providing a uniform cooking temperature in the cooking chamber.
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Goldberg E. A.
Lincoln Manufacturing Company, Inc.
Walberg Teresa J.
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