Patent Application
20080134905
This invention generally relates to cookware. More specifically, this invention relates to self-stirring cookware.
Traditional cookware has a container for holding food and a handle for use of handling the container. When cooking, people have to stir food to facilitate heat transfer and uniform heating. Such cooking techniques include stir-frying, sautéing, braising, simmering, etc.; which require skill and labor.
U.S. Pat. No. 6,845,707, issued to Xu, et al., on Jan. 25, 2006, teaches regarding an automatic cooking apparatus having a stirrer installed inside an inner pan for automated stirring and cooking. Since the stirrer rotates around a vertical axis, food inside the inner pan tends to co-rotate with the stirrer, as the stirrer rotates; which diminishes the effectiveness of the stirrer. Without proper stirring, food cannot be ideally cooked.
A solution to the issue is to add a co-rotation prevention feature to the sidewall of the container. A small portion of the sidewall protrudes inward laterally to a predetermined distance. The protrusion portion of the sidewall of the container extends generally vertical, from the upper portion of the sidewall downward to a predetermined height. However, this design is not effective in preventing food co-rotation. The protrusion cannot go inward far enough to realize optimum performance due to manufacturing limitations. This is increasingly amplified when cooking pans have large diameters.
Therefore, it remains desirable to provide a self-stirring cookware having an innovative co-rotation prevention mechanism that minimizes food co-rotation with the stirrer, as the stirrer rotates.
Accordingly, the present invention is a self-stirring cookware. This self-stirring cookware comprises a container having an open top and a sidewall for holding food, a lid for closing up the open top of the container, a stirrer installed inside the container for stirring food, and a co-rotation prevention device installed on the sidewall of the container for preventing food co-rotation with the stirrer, as the stirrer rotates.
Accordingly, the followings are some of the objects, features, and advantages of the present invention.
It is an object of the present invention to provide a self-stirring cookware, which can be used with a cooking platform that has a heating device and a power-drive system.
It is another object of the present invention to provide a self-stirring cookware that is highly effective in stirring food.
It is a feature of the present invention that this self-stirring cookware includes a co-rotation prevention device installed on the sidewall of the container for minimizing food co-rotation with the stirrer, as the stirrer rotates.
It is another feature of the present invention that the co-rotation prevention device includes an elongated member having an end installed on the sidewall of the container. The elongated member extends inward to a predetermined distance, away from the sidewall of the container, and further extends downward to a predetermined height, above the stirrer.
It is an advantage of the present invention that the co-rotation prevention device can significantly reduce food co-rotation with the stirrer, as the stirrer rotates, such that food can be effectively stirred for uniform heating and for efficient heat transfer.
Further more features and advantages of the present invention will be readily appreciated, as the same becomes better understood after reading the subsequent description when considered in connection with the accompanying drawings.
Reference is made to
A container 102, having an open top, a sidewall, and a central aperture on the bottom, is provided for holding food. Container 102 is, preferably, coated with a non-stick material. A supporting leg or rim 103 extending from the bottom of container 102 downward to a predetermined distance, such that container 102 can stand on a horizontal countertop. The bottom of container 102 is disposed and adapted to rest on a heating device (not shown) for heating food.
A lid 104 is provided for closing up the open top of container 102. Lid 104 can be made of a transparent material, or a metal material, but has an observation window (not shown), made of a transparent material, for observing cooking processes by users.
A handle 106 is fixedly installed on the upper portion of the sidewall of container 102 for use of handling container 102.
A stirrer 108 rotatably and removably installed inside container 102, is provided for stirring food.
However, as stirrer 108 rotates, it tends to push food forward, resulting in food co-rotation, especially when stirrer rotates at a lower rotation speed and container 102 is large in diameter. Food co-rotation diminishes the effectiveness of stirrer 108.
Reference is, again, made to
Device 110 includes an elongated member and extends generally vertical along the sidewall of container 102. The upper end of device 110 is installed on the upper portion of container 102 and disposed preferably close to handle 106, such that device 110 would not obstruct food unloading. Device 110 extends inward to a predetermined distance, away from the sidewall of container 102, and then further extends downward to a predetermined height, above stirrer 108. The clearance between the vertical portion of device 110 and the sidewall of container 102 is predetermined by the size of container 102 and the desired easiness of cleaning of device 110 and container 102. When food co-rotates with stirrer 108 and runs against device 110, as stirrer 108 rotates, the food pieces at a higher level would be stopped and tumble down due to gravity, resulting in better mixing or stirring of food, thereby facilitating heat transfer to and uniform heating of food.
A drive shaft 120 is threaded through the central aperture on the bottom of container 102. The upper portion of shaft 120 is engaged with stirrer 108. A coupling element 122 is installed on the lower portion of shaft 120. Coupling element 122 is provided for removably engaging an outside power-drive system (not shown).
A seal device 130 is provided for sealing between shaft 120 and the bottom of container 102, as shown in
Bushing 132 is co-axial to shaft 120. Packing 134 is imbedded inside a groove cut around shaft 120. A plurality of packing 134 can be provided for more reliable sealing, as known to those skilled in the art. When inserted into bushing 132 together with shaft 120, packing 134 is compressed and squeezed against shaft 120 and bushing 132 to create a seal.
Materials for packing 134 are extremely important when selecting the proper packing for an application. Basic requirements include heat resistance, wearing resistance, elasticity, etc.
Seal device 130 can, alternatively, take many other forms, such as bushing, labyrinth seals, or combinations of multiple forms for ideal performance, as known to those skilled in the art and suggested by this invention disclosure.
There is an important advantage of the alternative design illustrated in
Reference is made to
Device 140 includes an elongated member having both ends installed on the sidewall of container 102, side by side with a predetermined clearance between each other. Device 140 is preferably disposed close to handle 106, such that device 140 would not obstruct food unloading. Device 140 extends inward to a predetermined distance, away from the sidewall of container 102, and then further extends downward to a predetermined height, above stirrer 108. The clearance between the vertical portion of device 140 and the sidewall of container 102 is predetermined by the size of container 102 and the desired easiness of cleaning of device 140 and container 102.
Accordingly, readers will see that this self-stirring cookware of the present invention can be used with a heating device and a power-drive system to perform automatic stirring and cooking. Testing has shown superior performance of the unique co-rotation prevention mechanism disclosed in this invention disclosure. The co-rotation prevention device is simple to use and inexpensive to manufacture.
The present invention has been described in an illustrative manner. It is to be understood that the terminology, which has been used, is intended to be in the nature of words of description rather than of limitation.
Although this invention has been described in its preferred forms and structures with a certain degree of particularity, these should not be construed as limiting the scope of the invention but as merely providing illustrations of some of the presently preferred embodiments of this invention.
Thus it is understood that the present disclosure of the preferred forms can be changed in the details of construction and in the combination and arrangement of parts without departing from the spirit and the scope of the invention as hereinafter claimed.
