GB993869A - Insulated wall and method of its manufacture - Google Patents

Abstract

993,869. Moulding refrigerators. GENERAL ELECTRIC CO. July 24, 1962 [Aug. 1, 1961], No. 28399/62. Heading B5A. [Also in Division F4] A thermally insulated structure e.g. a refrigerator door 1, comprises a rectangular outer panel 2 having a front wall 5, side walls 6 and peripheral flanges 7; a rectangular inner panel 3 having a peripheral flat rim 8 and is characterized in that the length and breadth of the inner panel 3 are smaller respectively than the length and breadth of the space defined by the flanges 7; a channel member 30 (Fig. 2) of heat-insulating material having a forked member 31 is interposed between the two panels for engagement with one of them; a mass of thermal insulation 4 is disposed within and substantially fills the space between the panels; and means are provided for keying the outer surface of the channel member to the insulation 4. As shown, a gasket 33 is removably secured in channel 30. To manufacture the door, the outer panel is fitted with the channel 10 (Fig. 5) round its four edges and is placed on the table of a suitable press and into its box-shaped structure is applied a charge of foamable insulation-forming mixture. Immediately the inner panel 3 is placed in position with its flat rim 8 resting upon the flange of channel 10. Thereafter a back-up structure 38 is placed over the door and clamped in position. The door may be vented at 42 or may have therein strips 4a of compressible insulation material e.g. glass fibre to accommodate the expansion of the foam.