Stock material or miscellaneous articles – Sheet including cover or casing – Foamed or expanded material encased
Patent
1982-03-15
1985-09-03
Dawson, Robert A.
Stock material or miscellaneous articles
Sheet including cover or casing
Foamed or expanded material encased
5230911, 52455, 156 79, 156299, 264 465, 428 76, 428137, 428160, B32B 312
Patent
active
045392412
ABSTRACT:
A procedure for manufacturing a building element, such as a door, wherein the surface sheets of the element are affixed to a frame and between the sheets is placed an insulation. The insulation consists of polyurethane, which is injected into the interspace of the surface sheets so that it becomes glued fast to the sheets and to the frame. By the aid of the invention a rigid, tightly sealed and light weight building element is obtained. In another embodiment, at least one surface sheet is provided with apertures which are each covered with a sheet part formed in a plane separated from the surface sheet. A supporting frame is installed between the surface sheet and the edges of the sheet part, and the component parts are all bonded fast together by the polyurethane insulation.
REFERENCES:
patent: 3546038 (1970-12-01), Smith
patent: 3560285 (1971-02-01), Schroter et al.
patent: 4072548 (1978-02-01), Gerson et al.
patent: 4284447 (1981-08-01), Dickens et al.
patent: 4349495 (1982-09-01), Muttle
Kainulainen Raimo
Sipponen Antti
Toivola Tuomo
Dawson Robert A.
Smolowitz Martin
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