US2418382A - Bar stock and reinforcing bar - Google Patents

Description

April 1947- o. WENNBERG EIAL 2,418,382

BAR STOCK AND REINFORCING BAR Filed Sept. 8, 1945 2 Sheets-Sheet 1 I [/VVE'NYWBS 49' Odd Mflmery Jose M 9. 527165 H 51;

HIJOJZNEY.

Patented Apr. 1, 1947 BAR STOCK AND REINFORCING BAR Odd Wennberg,.Manhasset, and Joseph D. Stites,

New York, N. Y., assignors to Wegner Machincry Corporation, Long Island City, N. Y., a corporation of New York 7 Application September 8, 1945, Serial No. 615,225

This invention relates to reinforcing bars for use in concrete structures and the like, and particularly to that type of bar which comprises two rod-like sections joined in substantially parallel alignment by an integral intermediate section, or web, of lesser cross-sectional area than either of said rod-like sections, which type of bar is twisted around its longitudinal axis before use to form in effect a helical structure comprising two helices having a common axis. The use and purpose of such bar and the reasons for twisting the same are all well known, and it is likewise well known to provide on this type of bar ribs arranged on the outer surfaces of the bar, usually transversely, diagonally or spirally, herein called transverse ribs, for the express purpose of increasing the strength of the bond between the bar and the concrete or like material in which it is set or contained.

An object of this invention is to provide a bar stock of the above type which, when twisted and used as a reinforcing element, forms with the concrete or similar substance in which it is set a bond of great strength.

A further object of the invention is to provide a twisted reinforcing bar of the described type 7 Claims. (01. 72-111) Figs. 9, and 11 are cross-sectional views of other untwisted bar stock shaped in accordance with this invention.

. substantially parallel alignment by the intermehaving ribs so shaped as to promote between the bar and the concrete a lasting bond of such strength as will successfully resist the stresses arising in reinforced concrete structures.

Other objects and advantages will be apparent from the following description of the invention with respect to the specific embodiments thereof which are illustrated in the attached drawing:

In the drawing:

Fig. 1 is aplan view of a bar stock, before the twisting operation, embodying the principles of this invention; a

Fig. 2 is a View of the same bar at right angles to the view shown in Fig. 1;

Fig. 3 is a plan view of the same bar after twisting, said bar being thus ready to be used as a reinforcing element;

Fig. 4 is a cross-sectional view of the untwisted.

bar stock shown in Figs. 1 and 2, taken at 4-4 as indicated;

Fig. 5 is a plan View of another bar embodying the principles of this invention;

Fig. 6 is a side View of yet another bar embodying the principles of this invention;

Fig. '7 is a cross-sectional view of the untwisted bar stock shown in Fig. 5, taken at l'! as indicated;

Fig. 8 is a cross-sectional view of the untwisted cated;

diate section, or web, I6. This web has a crosssectional area which is less than that of either of the rod-like sections. The rod-like sections are usually roughly, or approximately, circular in cross section, bywhich is meant that they are circular, elliptical or ovate in shape, the exact shape forming no part of this invention and. varying somewhat according to the specific method of manufacture, which is usually some type of rolling process. The web l6 may bear the proportion shown in the drawing to the rodlike sections IE, or it may be thicker or wider, its specific shape and size being no part of the present invention. It will benotecl that the general shape formed by the web section and the two rod-like sections is roughly that of adumbbell, and many different and specific shapes of this dumbbell form have been shown and described in the art. Running along the outer surface of each rod-like section l5'and longitudi- It isnally thereof is the longitudinal rib l1. usually present in reinforcing bars of the type here under discussion because the manufacture of the bar by rolling is simplified if a certain amount of metal, as represented by the.longi'-' tudinal rib I1, is provided between the mill rolls during the bar shaping operation.

The advantages and benefits of the present my; vention derive from the shape of the transverse ribs disposed on the bar. We have discovered that if the transverse ribs such as the ribs Id in Figs. 1 to 4, inclusive), have peripheral surfaces which bar will be materially improved and enhanced. In the preferred form of the invention each rib is roughly, or approximately, triangular in peripheral outline or has sections of its extending surface in that form. The form taken by the ribs 1 3 l8 of the bar shown in Figs. 1 to 4, inclusive, if preferred, but the benefits of the invention may be obtained by the provision of ribs of equivalent shape. Another desirable form is shown in Fig. 9, Where the ribs 30 are so shaped as to form two projecting. angles 3!, thereby providing, in effect,

two triangular shaped wings or lugs projecting from the same surface of the rod-like section of the bar. The form shown in Fig. 4 is, however, preferred and when used, the rib I8 is preferably so located that the apex of its outwardly extending angle lies above the outer, i. e. web-free, surfaceof the section 15. However, good results will be obtained if the rib is so formed that the apex of its projecting angle lies outwardly of the inner surface of the section, as illustrated in Fig. 10 by the location of ribs 25 with respect to the section 24, or lies in intermediate positions, as'illus trated in Fig. 11 by the location of ribs 21 in the sectioni26i However, in these forms the. bonding strength isnot as great.

The ribs to which reference is thus made are,

from a manufacturing standpoint, best located in. planes at right angles to. the longitudinalaxis A of the bar, but they may be diagonally disposed without materially afiecting the bonding propertiesof the final twisted bar.

The spacing of the ribs with respect to the longitudinal axis ofthe bar and with relation to each other isdictated by known considerations as to bonding strength, strength of the bar, etc. In

the: preferred form shown in Figs. 1 to 4,.inclusive,

atransverse'rib l8 is locatedon each side of each.

rodelike sectionl5 so that atintervals alon the bar a plane at right angles to. the longitudinal axis Will passthrough four of the ribs l8. However, if desired, the ribs may be staggeredin variqugways, such as shown in Figs. 5 and 7, where the ribs 28 formed on each of the rod-like sections 2-9 are staggered so that no plane taken at right angles to the longitudinal axis of the bar centainsmore than two ribs, those ribs being ribs.

on opposite; sides Of'the same rod-like section 29.

Again, byway of example, the ribs may be staggeredas indicated in Figs. 6' and. 8; whereribs 22,.

which occur on either. side of the rod-like sections 23., are staggered with respect to eacho-ther so that the ribs on. the same sides of the sections 23 will fall-in thesame plane.

thepreferred form of bars. embodying the principles of this invention the ribs formed on the rod-like sections of the bar do not extend acrossithe intermediate web'which connects those sections in parallel alignment, i. e., the surface of the integral web isuninterrupted by ribs. For example, in the. form shown in Figs. 1 to 4, inclusive, the rib I3 merges into the surface of the rodlike section I5short of or at the pointer area where the surface of-the web It merges into that of. therod-like section. The advantage of this arrangement is best described by comparison with the: arrangement shown in Figs. 6 and 8 where the;

rib, 22, extends entirely around the bar but is shapd in accordance" with this invention, to form the projecting angular wings or lugs 33. There the rib extends over the web 34, andit will befobserved that if the bar is twisted, the rib-will- .form a pocket with the web.

formed'by the passage of the rib Hover the web. I 34maytrap moisture or air. as the concrete rises Thes pockets aroundthe bar, thereby preventing a. concretetion, as shown in Figs. 1 to 4, inclusive (and also in the forms illustrated by Figs. 5, 7, 9, l0 and 11) the use of ribs which do not extend across the intermediate portion or web of the bar prevents the formation of such a pocket when the bar is tWistedQ.

The reference to specificforms and shapes in the foregoing description has been by way of example and with no intention of excluding such equivalents as fall within the intent and spirit of the invention and the language of the appended claims.

We claim:

l. A bar adapted to be twisted around its longitudinal axis to form a reinforcing element, said bar comprising two elongated rod-like sections joined in substantially parallel alignment by an integral web of cross-sectional area less than the cross-sectional area of either of said rod-like sections. and integral ribs transversely spaced at intervals onthe surface ofsaid bansaidribs be roughly angular in outline and having a point-of maximumrib depth located over the outside surface of said rod-like section.

2'. A bar adapted to be twisted around its longitudinal axis to form a reinforcing element, said bar comprising two elongate. rod-like sections joined in substantially parallel alignment by an integral web: of crosssectional area less than. the cross-sectional area of either of said rod-like; sections and outwardly extending integral ribs transversely spaced at intervals onthe-surface of' said bar, the: extending sections. of said ribs' being roughly triangular in peripheral outline;

3. A bar adapted to betwisted, around its longitudinal axis tov form a reinforcingelement, said. bar comprising two elongate rod-like sections. joined in substantially parallel alignment by an integral web of cross-sectional area less. than the cross-sectional area of either of said rodlike sections. and outwardly extending integral? ribs transversely spaced at intervals on the surface of said bar, said ribs being, approximately triangular inperipheral outline.

4. A- bar adapted to. be twisted. around. its longitudinal axis teform a reinforcing element, said bar comprising two elongate rod-like sections. joined in. substantially parallel alignment-by an:

integral web ofcross-sectional area less: than metal. contact and diminishing bonding strength ndalso providing a place where corrosion of the;

bar -due totrapped air and moisture may readily takeplace. Ii -the. preferred form of v thev invene the cross-sectionalarea of either of. said rod-like sections. and outwardly extending. integral ribs transverselyspaced at intervals on the surface of said bar; said ribs being approximately angular in peripheral outline, the apex of theprojecting angle of said rib lying over the outside surface ofsaid-rod-likesection. Q s

5. A bar adapted to be twisted around; its longitudinal axisto form apreinforcing element,.said bar comprising two elongate rod-like sections joined substantially parallel alignment by an integral web. of cross-sectional area less than the cross-sectional area of either of said rodlike sections and outwardly extending integral ribstransversely spaced at intervals on the surface: of said bar, said ribs being approximately angular in peripheral. outline and. the surface of said integral. web being uninterrupted by said ribs.

6.. A. twisted reinforcing bar comprising two elongate rod-like seetionslongitudinally joined by an integral web, said bar being twisted about itslongitudinal axis into az helical, structure comprising two. helices having a common" axis and? REFERENCES CITED The following references are of record in th 5 file of this patent:

UNITED STATES PATENTS Number Name Date Stites Sept. 16, 1941 Paque Dec. 20, 1921 Ramsey Apr. 7, 1908

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