Abstract A structural panel is provided with a core comprising a thick layer of urethane foam. The core is reinforced by a sheet of metal wire fabric embedded in and effectively bonded to the urethane foam whereby to reinforce the same. Lining each of the oppositely facing surfaces of the core is a urethane sheet also bonded to the urethane foam. Extending into one surface of the panel and along one edge thereof is a wide angle, V-shaped groove of a depth sufficient to sharply reduce the thickness of the core to a thickness approximately corresponding to that of said metal wire fabric, whereby the panel is divided into main body and flange parts interconnected by a hinge formation consisting of the area of said wire fabric embedded in the area of said core sharply reduced in thickness by said groove, and of the associated areas of said sheets of urethane.
In a structural panel, the combination consisting of A. a substantially thick coherent porous core of polymeric material having
Claim 2
Dependent Claim
253 words
a flange part extending laterally from said main body part and disposed approximately at right angles thereto, said flange part being partially separated from said main body part by a deep cut extending from the line of intersection of the inner surfaces respectively of said parts toward the line of intersection of the outer surfaces respectively of said parts and disposed approximately at an angle of 45* to each of said parts, said cut terminating close adjacent the line of intersection of the outer surfaces respectively of said parts thereby to afford an area of said core sharply reduced in thickness and interconnecting said parts, B. a sheet of flexible wire fabric substantially coextensive with said core, said wire fabric being embedded in and effectively bonded to said core material whereby to reinforce the same, the areas of said wire fabric respectively embedded in said main body and flange parts being interconnected by an intervening area of said wire fabric extending through said area of the core sharply reduced in thickness as aforesaid, and the area of the wire fabric interconnecting the areas of wire fabric embedded respectively in said parts and extending through the area of the core sharply reduced in thickness by said cut is in the form of a wide angle, V-shaped score, the angle included between the opposite sides of said score being approximately 45*, and C. flexible sheet material lining at least one of the oppositely facing surfaces of said core and effectively bonded to said core material.