Panel framing system and products produced thereby

Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Outside corner or peripherally bordered

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Details

523094, 52762, 52763, 52775, 5279912, 264230, 264342R, 160378, 256 24, E04C 238

Patent

active

056619448

ABSTRACT:
A simple and inexpensive method and apparatus for molding a peripheral frame around a sheet or grid of thermoplastic material to produce a framed panel. A peripheral frame, preferably of structural foam or the like, is injection molded about a thermoplastic sheet or grid of panel-forming material which has been previously drawn or stretched at a temperature which orients the molecules of the polymer, i.e., below the glass transition temperature of the polymer, T.sub.g. Either during the frame molding process, or subsequent thereto, the panel-forming material is heated sufficiently to cause the material to shrink or revert toward its prestretched condition so as to tension the panel-forming material within the frame. Elastomeric sealing means are disclosed for sealing the mold during injection of the frame-forming material and locator fingers are provided to position a grid-like panel-forming material prior to initiation of the molding process. By the utilization of structural foam molding techniques, a panel of thermoplastic material may be integrally-molded and tensioned within a rigid frame to produce a framed panel of any size for use as a barrier, a fence, a guard, a closure, a seat or bedding support, a filter member or other such applications.

REFERENCES:
patent: 2681294 (1954-06-01), Beguin
patent: 3107991 (1963-10-01), Taussig
patent: 3273862 (1966-09-01), Miller
patent: 3523994 (1970-08-01), Shockey
patent: 3956550 (1976-05-01), Sutch
patent: 4248647 (1981-02-01), Herron et al.
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patent: 4709443 (1987-12-01), Bigley
patent: 4743323 (1988-05-01), Hettinga
patent: 4769100 (1988-09-01), Short et al.
patent: 5034077 (1991-07-01), Pata
patent: 5132148 (1992-07-01), Reafler
patent: 5184800 (1993-02-01), Tabler
patent: 5402988 (1995-04-01), Eisele
General Electric, "Handbook of Engineering Structural Foam", Jan. 1978, Cover, pp. 4-7, and Back Cover.

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