One piece peripherally ribbed sheet metal door

Details One piece peripherally ribbed sheet metal door One piece peripherally ribbed sheet metal door

1978-01-04

1979-10-23

Epstein, Henry F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including sheet or component perpendicular to plane of web...

401241, 113116HA, 428122, 428124, 428595, B32B 304

Patent

active

041721675

ABSTRACT:
A single generally rectangular panel member is provided including first and second pairs of opposite sides. The panel member defines first peripherally extending generally straight first outer marginal fold zones outwardly beyond and along which corresponding outer marginal portions of the panel member project and extend. The marginal portions are each reversely bent along the first fold zones over the first side of the panel member and each of the marginal portions, spaced outwardly of the corresponding first fold zone, includes successive second and third fold zones, between which corresponding second outer marginal areas of the marginal portions are defined, along which the marginal portions are bent, at generally right angles, toward the second and first sides of the panel member, respectively, first outer areas of the outer marginal portions being defined between corresponding first and second fold zones of the panel member. The marginal portions each further include a fourth fold zone, outwardly of the corresponding third fold zone, along which the marginal portion is folded, at generally right angles, toward the first side of the panel member, the marginal portions between corresponding third and fourth zones, each defining a third outer marginal area and the adjacent ends of adjacent third outer marginal areas are disposed in overlapped engagement with each other.

REFERENCES:
patent: 1768742 (1930-07-01), Brogden
patent: 2149882 (1939-03-01), Clements
patent: 2241266 (1941-05-01), Mayne et al.
patent: 2756463 (1956-07-01), Clements
patent: 3792522 (1974-02-01), Gray et al.
patent: 3848324 (1974-11-01), Perger

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