Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
2002-02-05
2004-05-04
Pelham, Joseph (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C126S02100R
Reexamination Certificate
active
06730880
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to cooking appliances, and more specifically to ovens.
Many known ovens include a fan for circulating air within the oven. For example, a typical convection oven includes a convection fan which operates in a single direction to circulate air within the oven during convection cooking. Such air circulation facilitates cooking by causing air to flow over, and to be heated by, the convection cooking element.
Cooking with such one directional fans, however, may result in uneven cooking. Specifically, the air flow path within an oven cooking cavity typically is not dynamic, i.e., does not change during cooking. For example, the fan is securely fixed to a wall of the cooking cavity and hot air from the cooking element typically is directed along a same flow path. As a result, the relative position of food within the cooking cavity with respect to the flow path impacts the evenness of cooking. For example, if a portion of the food is directly in the flow path of air from the convection fan, such food portion may cook more quickly than another portion of the food that is not in the direct air flow path. Uneven cooking can cause variation in browning and a darkening around the edges in baked products.
At least one known oven includes a plurality of fans and by reversing rotation of the fans, the air flow pattern within the oven cooking cavity is altered. Requiring multiple fans, including multiple fan motors for driving the fans, increases the cost of the ovens and may be cost prohibitive.
BRIEF DESCRIPTION OF THE INVENTION
In one aspect, an oven includes an oven cavity, at least one heat source for supplying energy to the cavity, and only one reversible fan assembly. The assembly includes a reversible motor, a shaft extending from the motor, and a fan coupled to the shaft. The fan assembly is operable to change an airflow pattern in the cavity by reversing a direction of rotation of the fan.
In another aspect, an oven includes an oven cavity, at least one heat source for supplying energy to the cavity, and at least one reversible fan assembly. The reversible fan assembly includes a fan motor, a shaft extending from the motor, and a fan coupled to the shaft. The fan is disposed in said cavity, the fan motor is a permanent split capacitor (PSC) motor.
In a still further aspect, a method for assembling an oven is provided. The method includes providing an oven cavity, and positioning a fan assembly including a fan motor, a shaft extending from the motor, and a fan coupled to the shaft, such that only one fan is in the cavity. The method also includes operationally coupling an oven controller to the fan motor, the oven controller configured to reverse a direction of a rotation of the fan.
In yet a further aspect, a method for providing air flow for an oven is provided. The method includes providing an oven cavity, and dynamically changing an air flow within the cavity using a single fan motor.
In another aspect, a dynamic air flow system is provided. The system includes an oven cavity, at least one fan assembly including a fan motor, a shaft extending from the motor, and a fan coupled to the shaft, the fan is positioned within the cavity. The system also includes at least one device positioned within the cavity and aerodynamically coupled to the fan.
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Chissom Mark Anthony
Cornett Hiram Dwayne
Kinny David Laurence
Muegge Coleen Judith
Rael Jennifer Elizabeth
Armstrong Teasdale LLP
General Electric Company
Houser, Esq. H. Neil
Pelham Joseph
LandOfFree
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