US1404198A - Reenforcing bar for concrete - Google Patents

Description

REENFORCING BAR OOOOOOOOO E.

CT. I?, l-QZl- 1, 4:0 4, 1 98. Patelted Jan. 24, 1922.

, UNITED ,STATES PATENT OFFICE.

i MAX J. season, or BIRMINGHAM, ALABAMA.

lj ;BEENroRoING BAR ron coNoRn'rE.

Lae-4,198.

To all whom' 'it may concern:

Be it known that I, MAx'J. GnRsoN, :a citizen of the United States of America, residing at Birmingham, in the. county of Jefferson and Stateo'f vAlabama, have invented certain new and useful Improvements in Ieenforcing Bars for Concrete, of which the following is a specification.

My invention relates to a reenforcing bar for concrete which is especially designed to be easily rolled, to present bonding surfaces to the concrete designed to give a bond of the maximum strength, to be readily stacked, and which is capable of being readily bent to accommodate itself to different specifications while at the same time possessing, in its preferred form, longitudinal stifening ribs which effectively strengthen the bar.

My invention more particularly contemplates the rolling of a bar having an approximately. square cross section but with V'all corners rounded and its dominant charasteristic is the provision along each face, between the convexly curved corners, of a longitudinal groove concave in cross section which is interrupted at spaced intervals with transverse ribs tapering towards their straight upper edges and lying in the concave of the groove. In my preferred arrangement the convexly curved corners are rolled with a tapered longitudinal center rib, the tip of which lies approximately at the intersection of the projected surface planes of the side faces of the bar adjacent to the rib.

.My invention will be more clearly understood by reference to the accompanying drawings which illustrate only its preferred embodiment, and in which Fig: l is a perspective end view of a bar rolled in accordance with its preferred design.

rig. 2 is a transverse cross section of the bar with the dotted lines showing the projected planes of the side faces forming a square within the boundaries of which all portions of the bar lie.

Fig. 3 is a perspective view of a modified embodiment of my invention; and

Fig. 4 is a cross sectional viewof Fig. 3 corresponding to Fig. 2.

Similar reference numerals refer to similar parts throughout the drawings..

In the embodiment of my .invention illustrated in i* ig. 1, I show a concrete bar rolled with each of its four similar side faces pro- Sp ecificaton of Letters Patent. Patented Jan. 24, 1922. I Application file October 17, 1921. Serial No. 508,352.

vided with a longitudinal central concave groove' 1, the side edges of which merge with a reverse curve into the convexly curved surfaces 2 forming a part of each adjacent corner. Thiscurved surface 2 termi'ates at the base of a longitudinal rib 3 into which it merges with a reverse curve. This rib 3, as showncle'arly in Fig. 2, tapers slightly and lies within the space bounded by the intersecting planes A--A and B-B of the adj acent side faces. As thus far described all four faces of the bar are similar. In each groove l I arrange at slightly spaced intervals transverse bonding ribs which taper from their base to their top edges, which edges lie in the plane A-A or B-B and do not project above the same. The ribs thus lie in the concave grooves and do not project above the plane of their respective side faces. The ribs are staggered on the several faces, the ribs in each opposite pair of faces lying in the same transverse plane, which is midway between the planes in which the ribs of the other pair of faces lie.

In Fig. 3 the bar is formed with the same longitudinal groove l and transverse ribs 4, but the corner ribs 3 are omitted and in lieu thereof the corners are formed by the convexly curved surfaces 5 into which the concave curve of the interposed groove 1 nerges with a reverse curve. As will be seen in Fig. 4, all portions of the deformed bar lie within the projected planes of its sides which outline a square and there is an absence throughout the bar of any sharp' corners or cutting edges which would militate against best results from the bar in service. By reason of the confining of all deformations within the square defined by the four side planes and the arrangement of the side faces soV that their exposed edges all lie in such planes, the'bar can be stacked as easily as a square bar while at the same time it presents a maximum bonding characteristic and a minimum disturbance of the main cross section of the bar which might affect the strength of its fiber. The corner ribs 3 serve to stifien the bar and increase its bonding strength and therefore this form is preferred. IVhile these ribs 3 stiffen the bar they nevertheless do not prevent it being easily bent as specifications may require.

I have typically embodied my invention in a four sided bar with faces of equal width, but the bar may have varied polygonal cross sections, and may be modified in minor details Within the scope of the appended claims. K

Having thus described my invention what I claim as new and desire to securebyV Letters Patent, is

l. A concrete reenforcing bar having a plurality of longituolinal side facesv along the center of each of Which is rolled a concave groove interrupted at intervals by transverse ribs, the upper-edges of Which lie in' a plane Contacting with the sides of their respective faces, the corners being formed by convexly curved surfaces Which merge With a Vreverse curve into the concave grooves of the two adjacent faces, and a long'itudinal tapering rib lyino` along the cen-i corner surface ter of each convexly curve MAX J. GERSON.

Witness: I

` NOMIE WnLsH;V

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