Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Fabric or lattice; e.g. – indeterminate grating
Patent
1988-06-08
1990-05-29
Scherbel, David A.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Fabric or lattice; e.g., indeterminate grating
52666, 52667, 52668, E04C 242
Patent
active
049284711
ABSTRACT:
An improved grating construction of the type intended for closing or flooring an opening. The construction preferably is formed of aluminum and includes a plurality of spaced, parallel, elongated bearing bars and a plurality of spaced, parallel, elongated, transversely extending crossbars. Each bearing bar has a generally flat, rectangular shape and has a plurality of spaced cutouts formed along a top longitudinal edge thereof. Each cutout comprises an upper rectangular-shaped portion and an outwardly flared lower portion. Each crossbar has a rectangular-shaped top portion and an outwardly flared lower portion, which portions are complementary in shape and size to the upper and lower portions of the bearing bar cutouts. The crossbars are slideably received within a plurality of transversely aligned bearing bar cutouts. The crossbars are deformed or swaged at locations adjacent to and on opposite sides of the cutouts engaged by the crossbars to lock the crossbars in the bearing bars to form the grating. The matching of the shape and size of the crossbar with that of the bearing bar cutouts enables the top surface of the crossbars to be substantially flush with the longitudinal top edges of the bearing bars which provides a generally flat surface for unobstructed walking or other movement on the grating.
REFERENCES:
patent: 1354998 (1920-10-01), Paulson
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patent: 4522009 (1985-06-01), Fingerson
patent: 4661245 (1987-04-01), Rutherford et al.
IKG "X-Bar" Steel and Aluminum Grating, p. 8, of a Product Catalog Offered by IKG Industries, a Division of Harsco Corp.
Pages 10 and 11 of a Product Catalog Offered by Bordon Metal Products Co.
Mai Lan
Ohio Gratings, Inc.
Scherbel David A.
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