Static structures (e.g. – buildings) – Conduit – trim – or shield member at corner
Patent
1988-08-22
1989-10-31
Murtagh, John E.
Static structures (e.g., buildings)
Conduit, trim, or shield member at corner
52254, 72180, E04B 200, E04F 1306
Patent
active
048768375
ABSTRACT:
A drywall corner bead providing a rounded nose and two mounting flanges extending from opposite sides of the nose is formed from a strip of galvanized metal of uniform thickness. The two flanges are provided with three discrete longitudinally extending bands of reduced thickness formed by shear deformation of the material forming the band. The flanges are knurled to emboss the surface thereof and openings are formed in the flanges at intervals along their length. The corner bead is formed by a method in which shear deforming forces are progressively applied to the material forming the thinned bands to produce lateral deformation of such material without any appreciable lengthwise deformation. After the thinned bands are formed, forces are applied to straighten the corner bead. Subsequently, the flanges are knurled to provide an embossed surface and holes are punched in the flanges at intervals along their length. Thereafter, the nose is formed to its final shape and the flanges are positioned at substantially right angles relative to each other.
REFERENCES:
patent: 831755 (1906-09-01), Vietor
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patent: 4291562 (1981-09-01), Orr
patent: 4317350 (1982-03-01), Sivachenko
patent: 4553363 (1985-11-01), Weinar
Alvarez Dennis A.
Howlett Robert E.
Kelly Patrick M.
Pomeroy Paul A.
Murtagh John E.
USG Interiors, Inc.
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