One piece peripherally ribbed sheet metal door

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

E - Fixed Constructions

06

B

108/27

E06B 3/76 (2006.01)

Patent

CA 1135123

ABSTRACT OF THE DISCLOSURE A single generally rectangular panel member is provided including first and second pairs of opposite sides. The panel member defines first peripherally extending gener- ally straight first marginal fold zones along which corres- ponding 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 includes successive second and third fold zones, between which corresponding second mar- ginal 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, res- pectively, first areas of the 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 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 marginal area and the adjacent ends of adjacent third marginal areas are disposed in overlapped engagement with each other.

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