US1885294A - Method of corrugating sheet metal - Google Patents

Description

Nov. 1, 1932. R. R. ROBERTSON I 1,835,294

METHOD OF CORRUGATING SHEET METAL Filed May 15, 1931 Patented Nov. 1, 1932 omen STATES ROBERT B. ROBERTSON, OF CHICAGO, ILLINOIS METHOD COBRUGA TING Application filed Kay 13,

der to reduce the' cost of concrete road con-' struction work and also reduce the amount of sheet metal required for the formation of center strips and similar devices, this in vention has been devised for the purpose of providing an improved and simplified method of cross-corrugating thin sheet metal to produce a stifiened and reinforced sheet metal having the strength of sheet metal of greater thickness and weight.

It is an object of this invention to provide a sheet metal material of comparatively light weight and thickness having crossed corruga= tions to strengthen the sheet metal to compare with the strength of sheet metal of greater thickness and weight.

It is also an object of this invention to provide an improved method of strengthening thin sheet metal by first diagonally corrugating the sheet metal and then turning the same bottom side up and providing the sheet metal with a series of diagonal secondary corrugations crossing and deforming the first group of corrugations.

It is a further object of this invention to provide an improved method for strengthening and reinforcing thin sheet metal, said method consisting of feeding a sheet of thin sheet metal at an angle between corrugating rolls to diagonally corrugate the material and then reversing the material by turning same upside down and again passing the same at an angle between the corrugating rolls to cross-corrugate the corrugated sheet.

1931. Serial No. 587,028.

It is an importantobject of this invention to provide an improved reinforced sheet metal adaptable for use in making road center strips and for other constructions requiring sheet metal, the improved reinforced 59 sheet metal being formed with groups of diagonally positioned cross-corru ations formed by first passing a thin sheet 0 metal at an angle through corrugatingor forming means and then turning over the partly cor- B6 rugated sheet and again passing the same at an angle through the corrugated means to provide a second group of diagonally postioned corrugations crossing the first group of corrugations.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompany ing drawing. v V The invention (in a preferred form) is as illustrated in the drawing and hereinafter more fully described.

On the drawir?:

Figure 1 is a ragmentary top plan view of a cross-corrugated sheet metal embodying 'm the principles of this invention; 7

Figure 2 is a detail sectional view of the material taken on line 11-11 of Figure 1;

Figure 3 is a fragmentary planview of a piece of the sheet metal illustrating a few of the primary diagonal corrugations to illustrate the first step in the crimping operation;

Figure 4: is a fragmentary top plan view of the piece of material illustrating the first group of diagonal corrugations and a few of the secondary cross-corrugations produced by the second corrugating operation of the .method; and a Figure 5 is an end view of a concrete road center strip formed of the cross-corrugated sheet-metal. i

As shown on the drawing:

" The present invention relates to an im- 90 roved sheet of non-annealed metal or, if desired, malleable or annealed metal.

The improved sheet metal is adapted to be cross-corrugated or ribbed by a simple method whereby the sheet of metal may be made out of comparatively thin material which,

when cross-corrugated by the improved metha required 0 selected angle through a crimping or forming machine or between corrugatin rolls to cause the sheet 1 to be formed with a series or plurality of parallel diagonal ribs or primary corrugations 2. After the sheet has been formed with the primary or main corrugations or ribs2, the sheet is reversed or turned bottom side up and is again positioned at the selected angle to be fed through the forming or'corrugating machine to cause the metal sheet to be formed with a plurality of parallel diagonal auxiliary or. secondary corrugations or ribs 3. ll'he auxiliary or secondary corru ations cross the main or primary corrugatlons partially deforming the same so that the cross-corrugations or ribs reinforce or strengthen one another to produce a metal sheet of increased strength and stifiness. v

It has been found that by cross-corrugating a plurality of sheets of non-annealed metal of substantially the same size that said sheets afterbeing crimped or cross-corrugated by the im roved method areall of substantially uni orm size while when sheets of an nealed' metal of substantially the same size are cross-corrugated, the resultant corrugated.

sheets may vary in size or length.

The improved method thus permits the cross-corrugated sheet of non-annealed metal to be produced out of metal which is less expensive than annealed sheet metal and which when cross-corrugated will produce substantially uniformly sized corrugated sheets from stock sheets out uniform size, while when annealed sheet metal is used, the cost is greater and the resultant cross-corrugated products are not always of uniform size or length even when produced from stock sheets of uniform slze It has been found that the improved crosscorrugated. sheets which may be constructed 'of non-annealed or hardened sheet metal will produce a reinforced or strengthened metal sheet of less weight and cost when compared with plain sheet metal of greater weight and thickness and higher cost.

The cross-corrugated sheet of thin metal produces a stiffened and reinforced sheet ess and weight.-

wherein the cross-ribs or corrugations produce integrally connected substantially diamond-shaped sections or units having high or apex portions 4 where the high portions of the cross-corrugations 2 and 3 intersect one another and with depressed portions or hollows 5 between the high or apex portions 4 substantially as illustrated in Figure 1. Where the high portions ofthe primary corrugations 2 cross the low portions formed between the secondary corrugations 3 and where the high portions of the corrugations 3 cross the depressions between the primary corrugations 2, partially depressed sections 011; points 6 are produced in the corrugated s eet.

Figure 5 of the drawing illustrates an end view of a concrete road center strip which is formed of the cross-corrugated sheet metal embodying the principles-of this invention, whereby the cost of the road construction work may be materially reduced due to the fact that comparatively thin-or light weight sheet metal can be used with said sheet metal being of non-annealedmetal which is cheaper than the annealed sheet metal ordinarily used The center strip shown in Figure 5 comprises a straight upper section 7 and a straight lower section 8 joined by an intermediate V-shaped. section 9. lntegrally formed at substantially right angles to the lower mar in or edge of the lower section 8 is a base ange 10.

It will, of course, be understood that various details of construction may be varied through a wide range without departing from the principles of this invention, and

not

it is, therefore, not the purpose to limit the I patent sitated y the scope of the appended claims. I claim as my invention: 1 p l. The method of reinforcing material,

comprising running the sheet material through a, former at an angle to produce diagonal corrugations in the sheet material, and then turning the sheet material upside down and again running the same at an angle through the former to produceauxiliary corrugations intersecting the first formed corru ations.

2. The met 0d of reinforcing. sheet metal which consists in applying diagonal pressure to the sheet metal to produce diagonal main corrugations therein, and then turning th--. corrugated sheet metal upside down and again applying diagonal pressure thereto to produce diagonal auxillary corrugations ranted hereon otherwise than necesltd ressure to produce auxiliary corrugations lntersecting the first formed corrugations.

4. The method of reinforcing nonannealed thin sheet metal, consisting in advancing the same at an angle to subject the' same to diagonal ressure to form diagonal corrugations in t 1e sheet metal, and then turning over the corrugated sheet metal and again advancing the same at an angle and rem peating the application of diagonal pressure to produce corrugations intersecting and deforming the first formed corrugations.

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County,

Illinois.

ROBERT R. ROBERTSON.

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