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 Building panel

Details
Inventors: Stephens, Norman M.; McRae, John B.;
Assignee: 501 Diamond Arch Systems Canada Inc. (Port Coquitlam, CA)
Primary Examiner: Friedman; Carl D.
Assistant Examiner: Dennison; Caroline D.
Attorney, Agent or Firm: Bull, Housser & Tupper

A generally quadrilateral-shaped building panel has a dihedral root portion extending along a major axis which bisects a pair of oppositely disposed corners. The panel has two similar triangular panel portions which extend from the root portion at a nominal dihedral angle to each other when viewed along the major axis. The panel has margin portions extending along each side edge thereof which can be secured to similar margin portions of adjacent panels. Each triangular panel portion has a crowned central portion which is displaced laterally from a nominal plane containing the margin portions of two side edges of the respective triangular panel and the dihedral root portion. The crowned central portion merges smoothly with adjacent margin portions and acts as an arch so that the panel is subjected mostly to compressive forces. This permits the use of fiber reinforced cement composite material as a substitute for common metal sheets, which can tolerate and are usual under tensile forces.

DETAILED DESCRIPTION We claim: 1.
A fiber reinforced cement composition building panel having: (a) a periphery including four generally straight side edges which define a generally quadrilateral panel having a pair of oppositely disposed first corners defined by intersecting side edges inclined to each other at equal first angles, and a pair of oppositely disposed second corners defined by intersecting side edges inclined to each other at equal second angles, (b) a major axis extending between and bisecting the first angles, and a minor axis extending between and bisecting the second angles, (c) a dihedral root portion extending along the major axis and dividing the panel into two similar triangular panel portions which extend from the dihedral root portion at a nominal dihedral angle to each other when viewed along the major axis, (d) margin portions extending along each side edge, at least two of the margin portions being adapted to cooperate with, and to be secured to, similar margin portions of adjacent panels to form an assembly of building panels, (e) a crowned central portion provided in each triangular panel portion, each crowned central portion being displaced laterally from a nominal plane containing the margin portions of the two side edges of the respective triangular panel portion and the dihedral root portion, the crowned central portion of the particular triangular panel portion being bowed smoothly outwardly from the nominal plane and on a similar side of the plane as the remaining adjacent triangular portion, the central portions merging smoothly with adjacent margin portions, (f) all panel portions having relatively thin wall sections.
2.
A panel as claimed in claim 1 in which: (a) the first angles are acute, and (b) the second angles are obtuse.
3.
A panel as claimed in claim 1 in which: (a) the crowned central portion of a particular triangular panel portion is displaced in the same general direction from the nominal plane of the particular triangular panel portion as the remaining adjacent triangular panel portion of the panel


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