US947199A - Reinforcing-bar for concrete structures. - Google Patents

Description

I A. G. KUESTER. REINFOBUING BAR FOR CONCRETE STRUCTURES.

' APPLIOATIONVIILED 111111.27, 1907 947,199. Patented m. 18,1910.

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' UNITED STATES PATENT OFFICE.

ALBERT C. KUESTER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR- T6 THE SCO FIELD COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

RE INFORCING-BAR FOR CONCRETE STRUCTURES.

Specification of Letters Patent.

Patented Jan. 18, 1910.

Application filed March 2'7, 1907. Serial No. 364,838.

tion, which while having its parts so ar-" ranged that any section taken in a plane at right angles to its longitudinal axis shall be equal in area to any other section similarly taken at any other part of its length, shall also he easy to roll as well as possess to a high degree, the various characteristics necessary in reinforcing bars, for use in structures of the class noted.

I further desire to provide a reinforcing bar of the above general character which shall be provided with projecting portions at intervals along its length, of such configurations as will permit of their formation by,

rollseasily made and maintained in good condition, and which shall satisfactorily act to tie together the various parts of the structure in which the bar is embedded.

These objects I attain as hereinafter set forth, reference being had to the accompanying drawings, in which:

Figure 1, is a side elevation of a length of my improved reinforcing bar; Fig. 2, is a plan of the-bar illustrated in Fig. 1, and Fig. 3, is a vertical section taken on the line 3-4:, Fig. 1.

In the above drawings, represents the body of the bar, which will be seen from tion.

untilit reaches the edges of the bar where it coincides with said edges. From each edge of this rojecting'portion b, there extend incline portions 6, sloping downwardly longitu inally of the bar, the projections being so spaced that the distance between their adjacent portions 6 is, at their nearest points, substantially equal to the width of the portion 7). Moreover the projections. B on one side of the bar are placed so as to be midway between a pair I of projections B on the opposite side of thebar ;--the result of this construction being that anytransverse section of the bar is sub stantially equal in area to any other transverse section thereof, regardless of where it is taken. As a result, it is obvious that in rolling the bar there is no surplus matter to be taken care of as the piece under treatment is passed through the rolls,'and moreover, when the bar is in use, its tensile strength is substantially the same at all points of its length. The nature of the projections is also such that the bar makes asatisfactory bond with the concrete of the structure in which it is embedded, in asmuch as they constitute isolated trans verse ribs which cfl'cctually render impossible any relative movement between the bar and the body of concrete.

In order to facilitate the making of rolls, I may make the grooves therein for forming the projecting portions B and B with a milling cutter, in which case all transverse circular elei'nents of the surface 7) will be concentric with the transverse circular clomenis of the surface l); thus making all' transverse sectional areas of the bar substantially equal in area, although not mathemab ically so.

I claim:

1. A. reinforcing bar of equal transverse sectional areas throughoutits length, said bar having two series of projections on opposite sides thereof, the )l'0j(.(ftl()llS of one series b'eing oppositethe spaces between the projections of 'the other series and being equal. in area of cross section to said spaccs in a median plane of the bar, said projections diminishing in cross section from such plane to the sides of the bar. I

2. A reinforcing bar of substantially equal transverse sectional area throughout its length, said bar having two series of projcctions on opposite sides thereof, the projections of one series being opposite the spaces between the projections of the other series and each consisting of an independent transvers'ely extending rib, each projection and the space between a pair of ad acent pro ectil) 92% Mame tions being of substantially equal area. of cross section in amcdian planeof the bar, and said projeetionssloping or decreasing in height from such median plane to the sides of the bar, i 7

3. A reinforcing bar having a body of elliptical section and provided with two series of projections on opposite sides thereof, the area oil cross section of the projections on each side of the bar being substantially equal to the area of cross section of the spaces between the projections at the median plane of the bar each of said projections din'iinishing in width and height from such ncdi an plane to the sides of the ban I 4. A reinforcing bar consisting of a substantially round body provided with opposite longitudii'ial series of transversely arranged bemding projections, the separate s rics of projections projecting from dian'iotrically opposite portions of the bar body, and the projections of one series boinq in staggered relation to the projections of the opposite series, each of said nojeclions on circling approximately one-half oi the circumference of the bar body and boin o i' a tapering projection -from its highest point: to its opposite terminals, and the projections in the two opposite rows being disposed in directly adjoining and abutting relation.

In testimony whereof, l have signed my name to this s ieciticaiiom in the presence of two subscribing witnesses. 4

ALBERT Cl. h UES'PER.

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