US 3111788 A
Description (OCR text may contain errors)
Nov. 26, 1963 .P. OUELLET ROOF PANEL Filed July 18, 1960 IN VE N T01? g Fl PATENT AGENT United States Patent Ofi lice 3,1 1 1,788 Patented Nov. 26, 1963 3,111,788 ROOF PANEL Paul Oueliet, 750 S. North Lake Drive, Hollywood, Fla. Filed July 18, 1960, Ser. No. 43,370 2 Claims. (Cl. 50-236) This invention relates to roof panels for trussless roofs and has special reference to arch roof panels.
Moreover the invention relates to improvements in such roof panels such as are shown in the patents to Blaski Nos. 2,436,543 and 2,257,153 and to patent to De Pfyffer, 2,167,370, this present invention accomplishing the purposes of these prior inventions in a more highly efiicient manner, the individual panels being preformed as self supporting steel arches.
One of the important objects of this invention is to provide an arch element for the above purpose which may be formed of steel plate rolled to shape and, when so shaped, having a high degree of resistance to binding and deforming stresses.
Another important object of this invention is to provide joint means for connecting the panels in side-by-side relation.
Still another object resides in a panel having an improved corrugation arrangement to obtain maximum resistance to shearing and of an improved cross-sectional shape affording a maximum section modulus.
With the above and other objects in view, as will be presently apparent, the invention consists in general of certain novel panels of improved arch shape formed to resist deformation and being adapted to be secured together to form a roof, the construction being hereinafter fully described, illustrated in the accompanying drawings and particularly claimed.
In the drawings like characters of reference indicate like parts in the several views, and:
FIGURE 1 is a perspective showing an interior View of a portion of three assembled arch panels;
FIGURE 2 is a side elevation of part of a panel;
FIGURE 3 shows a cross-section of the means for securing the panels in side by side relation; and
FIGURE 4 is a schematic cross-section of a panel.
The panels which for the arch members of this invention are formed from rectangular metal sheets which are so formed and shaped as to constitute arcuately extending troughs. Each of these troughs has a cross-section providing a pair of flat sides or wings extending in acutely angled planes.
These wings flare upwardly from the central floor portion 11 of the sheet. This floor portion 11 as shown in FIGURE 1 extends rectilinearly between the wings 16. This floor is continuously transversely corrugated throughout its length to form equally spaced rounded depressions or grooves 12 alternating with raised flat floor sections 13. The corrugations thus formed are of uniform semi-circular cross-section throughout their lengths and extend transversely between the opposite wings of the unit to terminate at said wings.
Extending from the ends of the floor portions 13 in the floor 11 into the inner faces of the wings 10 is a series of spaced grooves 15 of semi-circular cross-section. The wide ends 16 of these grooves 15 correspond in depth and width to the grooves 12 in the floor 11. These grooves 15 taper to sharp points 17 to merge in the wing surface below the top outer edge of the Wings 19. The grooves 15 are offset relative to the grooves 1.2 and their wide ends are located below the floor sections 13. By this arrangement the corrugations and grooves unite to prevent distortion of the trough shaped panel and aid in retaining it in properly arched shape, while preventing that the drawn weaker metal areas extend in a common cross-section of the trough as would be the case if the grooves 12 and 15 were registering. A better resistance to shearing stress is obtained.
The outer edges of the wings 10 are provided with a laterally projecting horizontal flange 18 and a downwardly inclined flange 19 which is beaded at its free edge 21, such that, upon two like panels being brought together side by side these flanges will interlock in nested relation. A reinforcing channel 20 may then be placed in the space below the flanges and there secured. By this arrangement a segment-cylindrical roof may be formed.
The cross-sectional shape of the panel of the invention is such that a maximum section modulus is obtained. I
Referring to FIGURE 4, x indicates half the width of floor 11, l indicates the width of the Wings 10, h indicates the depth of the trough, w indicates the effective width of the panel; t indicates the thickness of the metal sheet;
and 0c is the angle between the floor and the wings. Obviously, the panel being symmetrical, the neutral axis is at the center.
The moment of inertia I for half the width is:
3 2 3 2 lt sin a lt cos (x 6 6 the last term can be neglected and en @E 1 al Thus 2 tach The section modulus is IX =th(xZ/6) It can be derived that the maximum section modulus is obtained when half the width of flange 18 is equal to that the ratio:
is equal to about 1.417 and that on is equal to about 4651. As an example the section modulus of a 36 wide sheet of 0.5 thickness is 2.05 in. which is a considerable improvement over the maximum value of 1.73 in. of all 36 wide sheets and of the same thickness actually used for the same purpose.
Although a specific embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the spirit and scope of the invention as indicated by the appended claims.
What I claim is:
1. An arched structural unit having a trough shaped cross section, comprising a longitudinally extending flat floor portion, a pair of diverging flat wings extending from the side edges of the floor portion and connected by the latter, said floor portion being provided with transversely extending grooves uniformly spaced continuously throughout its length and of uniform semi-circular crosssection and terminating at said side edges to define flat floor sections separated by said grooves, said wings being provided with transversely extending grooves of semicircular cross-section offset from said floor grooves and extending from below the edges of said floor sections and decreasing in width and depth to sharp points merging with the faces of said Wings and spaced from the top edge of said Wings to define a flat and smooth top marginal portion for said Wings, a laterally outwardly depending flan e at the top edge of each Wing and a downwardly inclined flange at the free edge of said lateral flange, said inclined flange having a beaded free edge, the Width of said laterally outwardly depending flange being about one third the Width of said floor, the Width of said wings being equal to about 1.4 the Width of said floor, and the outside angle between the floor and the Wings being about 47.
2. A unit as claimed in claim 1, wherein the width of the ends of the grooves of said wings adjacent the said floor sections is substantially equal to the Width of said floor sections.
References Cited in the file of this patent UNITED STATES PATENTS Murphy et al July 8, 1913 Schlafly Oct. 31, 1922 Ramonoff May 30, 1939 De Pfyfier July 25, 1939 Sendzirnir Feb. 13, 1940 Lang July 9, 1940 Willoughby Dec. 31, 1940 Balaski Feb. 24, 1948 Hermann Nov. 12, 1957 FOREIGN PATENTS Great Britain 1914 France Sept. 14, 1959