US862897A - Expanded metal. - Google Patents

Description

PATENTED AUG. 13. 1907.

w. D. FORSYTH. EXPANDBD'MBI'AL. APPLICATION TILED FEB-1; 1907.

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WILLIAM DIFORSYTH, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR- TO TRUSSFD CONCRETE STEEL COMPANY, OF DETROIT, MIOHIGAN,' A CORPORATION OF MICHIGAN.

EXPANDED-METAL.

Specification of Letters Patent.

Patented Au 13,1907.

Application filed February I 1907. Serial No. 355.188.

, l concrete construction; and the process of making the same;

My invention consists of a process for forming expanded metal which is made. up of three steps;1st,- shearing the sheet metal along longitudinal lines, the

the portions extending transversely of the line of the slits, one of the portions extending in one direction from the center of the lirst slit and parallel to the gen: eral line of slits, and the two other 'poltions extending parallel to the first but in opposite directions and from the ends of the first slit, the second portion of the slit extending up between the third and fourth portions of the next adjacent; 2nd,striking' up the tongues which are formed by the first, third and fourth slits spoken of, so that saidtongues project at right angles from the body of the plato and have portions at their ends projecting parallel to the plate; and 3rd, expanding the shecl. laterally so that the halves of the tongues will separate at their bascs and swing down toward the main sheet.

. M y' invention also consists in a novel expanded metal consisting of longitudinal ribs or bands connected by transverse ties, on ch in a plane at right angles to the main sheet. Those ties are formed in halves connected at the outer ends to the main ribs and connected together at the inner-ends, the ribs and ties being integral.

My improved sheet metal is illustrated in the ac companying drawings in which Figure 1 shows a piece of sheet metal slitted pre paratory to placing the same in the forming dies. Fig. is a view of the same after passingthrough the forming dies. Fig. 3 is atransverse and Fig. 4 2. Ionitudinal cross section on the lines 3-3 and 4-4 of Fig. '2 respectively, both inverted. 'Fig. 5 is a top "View, Fi, 6 is a bottom view and Fig. 7 is an end view of the sheet after it has been expanded.

Similar reference chars-ctsrs refer to like parts throughout the several views.

close together and the plaster to be carried is not heavy, number 32 sheet nietal may be employed,

slits being formed of four connected. portions, one 0t My improved expanded 'nietal may be formed oi while in case the material is to be used as a tension 5 member for long composite concrete and uiclal floor spans, its thickness may be one-eighth of an inch or more.- While I have shown a sheet with but three lines of slits and tour ribs, it will be evident lhat any number of lines of slit sand ribs are possible. In l'orui- (i0 iug this sheet metal, the slitting may be done by a sell' feeding machine which slits the entire sheettransver ely to the rows of slits at a single stroke and at the saute time strikes up the tongues from a line of slits caused by the previous stroke.

In Fig. l the sheet 1 is provided with threelongiludinal lines of slits Each slit is composed of four portions, the transverse portion 2, a longitudinal portion 3 which connects to the middle of.thc part 2 and ex-- tends to the right in Fig. 1,- and two portions 4 and Whiqh connect to the e nds of part 2 and extend to the left in Fig. 1. The portion 3 of one slit extends up between the parts 4 and 5 of the next adjacent slit and the distance between the end of'the part 3, and the part 2 of the next adjacent slit is preferably about the same as the transverse distancev between this part it and the parts 4 and 5 of the adjacent slit. The sheet having been slitted, it is placed where it may be acted upon by a forming die Which'prcsses down the tongue included between the parts 2, 4 and 5 of each slit bending it so as to extend at a right angle to the main sheet and also bending the ends 7 of the tongues so that they are extended parallel to the main sheet-as shown in F 3-mid 4. Referring to the first four figures, it will be noticed that these tongues are bent. up on a transverse of line extending across the sheet at the ends of the portions of the slots marked 4 and 5, and that the ends of the tongues whichare parallel to the main portion of the sheet are bent on lines that extend across the sheet at the ends of the portions 3 of the slots. The tongues thus struck up are split their entire length with the exception of the small bent-over ends 7 ol' the same, which ends of the tongues now form the only connection between the longitudinal ribs (3. There are thus formed upstanding tongues which have short bent-over portions 7 to which are connected the parts 8, which parts in turn connect to the ribs (3 at 1).

After the sheet has been formed, the outer longitudinal ribsG are pulled from each other which will cause all the tongues to open along the slots 3, and the portions 7 of the tongues will fold up on their central lines until they approach each other, and the side portions 8 will bond at the lines!) until the parts 8 of each rib assume the positions indicated in Fig. 7. The resultant material is therefore composed of ribs or longitudinal members 6 connected by a series oi lies. ouch of which is composed of a pair of members Sharing a connecting portion 7, and having outer ends bent at right angles and united to the longitudinal members 6 by longitudinal portions at 9.

It will be noticed that. the distance that the longitudinal members 6 can move from each other is equal to double the distance that the portion 3 of a slot extends between the parts 4 and 5 of an adjacent slot.-

All that. is necessary to expand the metal more is to increase the length of the slots 3, 4 and 5. The resultant material possesses great transverse strength for weight, because the parts 8 are at right angles to the longitudinal members 6 and because they are so strongly connected thereto. 7

Having now explained my improvement, what desire to secure by Letters Patent is:

1. The process for forming expanded metal which coir sists in slitting the same along longitudinal lines so as to form parallel bands connected by tongues split through their bases. striking up the tongues and bending the unsplit portion of the same back parallelto the mainshcet, and thou expanding the material by separating the longitudinal nicmbors laterally.

2. The process for forming expanded metal which consisls in shearing a sheet to form longitudinal lines of slits, each slit comprising a transverse portion, a. longitudinal portion connected to the center of the transverse slit. and two other longitudinal portions extending in the opposite direction from the' first and connecting to the mass? ends of the transverse portion of slit, the central longitudinal portion of one slit extending up between the oppositely extending longitudinal'portionsof the adjacent slit; and striking up the tongues formed by such slits'nnd then expanding the metal laterally. I

The process of forming expanded metal which consists in slitting the same along longitudinal lines so as to form parallel bands connected by tongues split through their bases, and expanding the material.

4. An expanded metal comprising a series of longitudirial members, and a sries of ties connecting the same, each tie formed of two parts connected at a line midway between the main tension members, all the members being integral.

5. An expanded metal formed from a sheet which is slitted along longitudinal parallel lines, each slit formed of a transverse portion, a central longitudinal portion, and a pair of longitudinal portions extending from the ends of the transverse portion in theopposite direction WluliIA'M I). FORSYTII. Witnesses l-hiw.\la N. laonnsnx, Enr/num'rn M. known.

6. An expanded metal comprising longitudinal members,

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