F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
62/37
F25D 21/08 (2006.01) A47F 3/04 (2006.01) F25D 21/04 (2006.01) H05B 3/84 (2006.01)
Patent
CA 1077284
ABSTRACT The present invention relates to refrigerated display cabinets and more particularly to an electrically heated door structure for use In such cabinets. The use of an optically transparent electrically conductive coating for preventing moisture condensation of the frontmost glazed surface of a refrigerated cabinet door window is previously known. Once the door is fabricated, the electrical resistance of the door window heating coating is fixed. To prevent condensation and frost from forming on the door frame, it is known in the art to provide electrical heating elements concealed within a groove within the door frame structure. Normally, once the heating element in the door frame has been installed, its electrical resistance is also fixed. Prior to the present invention, it has been known to connect the heating element in the door frame to the window heating element in either series or parallel con- nection depending on the environment in which the door would be operated, but the interconnection was not thereafter alterable without disassembling the door. The present invention premits the door to be operated selectively at a plurality of power settings, providing respectively higher and lower levels of electrical heating. A switching means is used to alter the electrical interconnection of the door window heating elements with the door frame heating elements from a series connection to a parallel connection. In one embodiment an automatic electrical controller actuates the switch in response to changes in the ambient humidity and temperature.
312177
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