US814689A - Metal open-work fabric. - Google Patents

Description

PATENTED MAR. 13, 1906;

K FA

D JULY13 I J.-F. GOLDI METAL OPEN WOR APPLIaATIoN FILE BRIG.

wi'hwareof UNITED sTATas PATENT OFFI E.

JOHN F. comm e,- OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO MONOLITH STEEL COMPANY INCORPORATED, A CORPORATION OF VIRGINIA.

METAL OPEN-WORK FABRIC.

No. erases.

Specification of Letters Patent.

Patented March 13, 1906.

Application filed July 13. 1905. Sria1No.269 5 63.

'a citizen of the United States, residing at' Washington, in the District of Columbia,

-prov'er nents in Metal Open-Work Fabrics, of

which the following is a specification. My invention relates to 'metal open-work fabrics for "use-in concrete and other purposes of the; character described in my applications, Serial No. 246,608, filed February 20, 1905, and Serial .No. 246,609, filed February 20, 1905 ,and relates to an improved. form of the mairi'ortension bar; i

. ..duce such abar as can be easily produced by a rolling process, which will obtain a very secure hold upon the rods or-supplemental members that are to be connected with it, 2 which will guide such rods or members into placein the assembling'of the parts during the process of manufacture, and which will readily admit the concrete to interlock with it and to hold it against strains which are transverse to the bar. r v f The invention consists in the parts and combinations-thereof hereinafter set forth and claimed 'g In order to make the invention clearly undrawings; means for carrying the same into practical effect without limiting my improvehave invented certain new and useful Im-- The objects of improvement are toproderstood, I have shown inthe accompanying ments to the precise constructions whichffor the sake of example, I have illustrated.

In said drawings, Figure 1 is aplan view a portionflof a metal open-work fabric having main longitudinal or tension bars embodying m 1 line III III of Fig. 1 Fig; 3 is a cross-sec-x tion, on an enlarged scale, of-one of the main 7 improvements. Fig. 2 is asectionon longitudinal'or tension bars in' theforrn which it has before connection .with the rods or supplemental members. Fig. 4 is a similar section showing one of said, bars com pressed b y' rolling orswaging and united with connecting-rods or supplemental membersi Referring to the drawings, A indicates the main longitudinal or tension bars, here shown as combined in a .metal open-work fabric.-

Each bar is ordinarily of steel produced by rolling and has a main body orweb 15 and extending from and beyond such main body lips 5. These lips are preferably formed on both sides of thebar extendingjlate'rally, as

5 5 shown butI have shown in my said a plication howbars having a single pair of on one side may bearranged and connected in a fabric of this character. Each pair of lips forms a groove or channel 2, in which are inserted portions 4 of rods 3; The compression of the bar by rolling or swaging after the parts are assembled causes the lips to grasp said-portions 4, and the permanent set'which is thereby given to the metal of the bar retains the rods 3 withgreat force and security. The compression of the bar is indicated in Fig. 4, the dotted lines o 1) at the top and bottom showing the original contour of the uncom ressed bar.

I ave discovered that for the best results it is necessary or desirable to make the grooves 2 and the inner sides of the lips 5 of peculiar shape. If such grooves are made with straight and parallel sides, the rods cannot be readily introduced into the grooves in the desired automatic assemblin feeding, and rolling process by which thefa ric is produced. Also it is difficult to roll a bar with such a groove, because the roll-flange which forms the groove is too thin and weak at its base where it joins the body of the roll and is liable to be broken off by any deviation of the bar as it passes through the rolls. On

the other hand, asimple flaring groove-is liable to wholly or partly expel the rod portion 4 when the bar is compressed without the lips obtaining the desired secure hold on such rod portion; 1' I have obviated these difliculties .;in the fillustrated construction. Refer- -;I 'i 1i*to Fig.f 3,' where the contour of the bar can be'st be 'seen, it will be observed that the base or inner part of -thegroove is semicircular iiircross-section, and thence flares or -.widens'outwardly along the lines t at, which 'join'tangentially theouter rounded parts of ;,the -1ips 5' I This form .of groove can safely ibe roduced by rolling without danger to the rel-flange, such flange having a thick and strong base between thelines u u. The rod portions 4 can be readily introduced into it y mechanical assembling or feeding devices, being guided'in by the converging'surfaces along the lines a. The concrete enters the flaring groove readily to be securely locked, and the initial pressure when the bar is compressed is, along the line w, which passes through the center as, around which the base of the groove is described, and has-a tendency to retain rather than expel the rod from the groove. Preferably the flaring lines at a do not begin exactly at the line w, but ratherat the line y, which is just a little distance outside the line w, and from the line w to the line 1 the top and bottom of the groove 2 (and the inner opposing faces of the lips 5) are at .2 straight and parallel for a thirty-second or sixteenth part of an inch. In the drawings the distance between the lines to and 1 is exaggerated for the sake oi clearness. The actual perlerred distance depends upon the sizeof the bar, which ordinarily is from onehalf of a square inch to two and a half square inches in crosssectional area.

It will be understood that my present improvements maybe employed in tension-bars in structures of the character described in my application, Serial No. 246,609,filed February 20, 1905.

The flaring or widening of the groove 2 begins at points distant from the bottom of the groove suflicient to obtain the desired secure hold upon the rods or supplemental members. Thus the flaring or widening may begin at the ends of the line w or at the ends of the line 3 as illustrated'in Fig. 3, or at points along the lines 2.

- The rounding of the lips 5 at their outer extremities is important not only for the purposes of facilitating the insertion of the rods '3 and the entrance of the concrete,-but also to prevent the cutting or cracking of the set concrete by any edges of the tension-bars which might be caused by shocks or strains which the concrete and the metal open-work structure resist unequally.

. My improvement includes bars having grooves the bottoms of which are formed-on elliptical, oval, or other than circular curves, the latter form being that Which is illustrated.

At C is shown a portion of the body of concrete in which is embedded the structure illustrated in Fig. 1.

In the preferred construction of the bar A the lips 5 are formed of substantially the same thickness as the width of the intermediate groove and of substantially the same contour, reversed, as the groove.

What I claim is 1. In combination with a body of concrete, cement or the like, a longitudinal tension bar. or member havin lips extending from and beyond the main ody of the bar, said lips forming a continuous groove which flares or widens outwardly substantially as and for the purposes described, and a rodor supplemental member secured in said groove by the compression of the bar, the concrete entering within the open portions of said groove and embedding said lips.

2. A metal open-work structure for use in concrete and other purposes, consisting of longitudinal tension bars or members each having lips extending from and beyond the main body .of the bar said lips forming a continuous groove which flares or widens outwardly, and a rod or supplemental member secured 111 said grooves by the compression of i the metal of the bars and securely connecting the bars, substantially as and for the pur poses described.

3. A metal open-work structure for use in concrete and other purposes, consisting of a longitudinal tension bar or member having lips extending from and beyond the main body of the bar, said lips forming a groove which flares or widens outwardly the flaring or widening beginning at points distant from the bottom of the groove a distance equal substantially to half the width of the groove,

the bars and secure y connecting the bars,

substantially, as and for the purposes described.

5. A metal open-work structure for usein concrete and other purposes, consisting of a longitudinal tension bar or .member having lips extending from and beyond the mainv body of the bar,.and a rod or supplemental.

member securedbetween the lips by. the compression of the bar, said lips forming a groovewhich flares or widens'outwardly from points at or beyond the middle of the secured portion of the rod or supplemental member, substantially as and for the purposes described.

6. An element for sizmetal open-Work structure for use in concrete and other purposes, consistin of a longitudinal tension bar. or

member aving lips which extend from and beyond the main body of the bar and are adapted for the securing of rods orsu plemental members by the compression or the bar, and lips forming a continuous groove which is curved at its bottom and thence flares or widens outwardly substantially as and for the purposes described.

7. A structural element for metal openwork, for use in concrete and other purposes, consistin of a longitudinal tension bar or member aving lips whiehextend from and beyond the main body of the bar forming continuous grooves and are adapted for the securing of rods or supplemental members, by the compression of the bar, the outer extremities of the lips being rounded, substan tially as and for the purposes described.-

8. A structural element for'fiin'etal openwork, for use in concrete and other purposes, consisting of a longitudinal orii'tensi onbar having lips 2", which extend at intervals from and beyond the main body of the bar forming continuous grooves and are adapted for the securing of rods or supplemental members by the compression of the bar, substantially as and for the pur oses described.

9. In combination wit 1 a body of concrete, cement or the like, a strengthening metal bar formed on its sides with continuous grooves, and with lips 5 at the sides of the grooves of substantially the same thickness as the width of the grooves, said grooves flaring outwardly and the lips being rounded at their outer parts and embedded in said body of concrete, which enters said grooves, substantially as and for the purposes described. 7, W

10. In combination With a body of concrete, cement or the like, a strengthening metal bar formed on its sides with continuous grooves which flare or widen outwardly, the flaring or widening beginning at points distant from the bottoms of the grooves a space substantially equal to half the width of the groove, and rounded'lips 5 at the sides of the grooves, the concrete entering within the grooves and embedding said lips, substantially as and for the, purposes described.

11. A strengthening-bar for use in concrete, cement and the like formed on its sides with grooves and with lips 5 at the sides of the grooves of substantially the same thickness as the'widtlfof the grooves, said grooves flaring outwardly and the lips being rounded at their outer parts, the depth of the grooves below the flaring portions being greater than the radii of the grooves, substantially as and for the purposes described.

12. A strengthening metal bar for use in concrete, cement and the like formed, on its sides with grooves and with lips 5 at the sides of the grooves, which lips are of substantially the same thickness as the width of the groove and of substantially the same contour as the groove, said grooves flaring outwardly and the lips=being rounded at their outer parts, the depth of the grooves below the flaring portions being greater than the radii of the grooves, substantially as and for the purposes described.

In testimony whereof I affix my signature-

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