US858693A - Reinforcing-bar. - Google Patents

Description

PATENTED. JULY 2, 1907. WHITE.

RGING BAR.

FILED JULY 2, 1906.

H. E REINFO APPLICATION UNITED s'r'rns .nn gnnr Enron.

HERBERT E.

. COMPANY, OF YOUNGSTOWN,

WHITE, OF YOUNGSTOWN, OHIO, ASSIQNOR TO THE GENERAL FIREPROOFING OHIO, A CORPORATION OF OHIO.

REINFOROING-B AR Specification of Letters Patent.

E atented July 2,1907.

Application filed. July 2 1906. Serial No. 324,515.

" have invented certain new and useful Improvements in Reinforcing-Bars, of which the following is a specification, accompanied by drawings.

Thisyinvention relates to reinforcing bars or members for concrete and other masonry constructions, and the object of the invention is to improve upon the construction of such bars and enable them to be more solidly and securely embedded in masonry or concrete than heretofore, to prevent slipping.

Further objects of the invention will hereinafter appear and to these ends the invention consists of a reinforcing bar for carrying outthe above objects embodying. the features of construction, combinations of elements,

and arrangement of parts having the general mode of operation substantially as her naiter fully described and claimed in this specificatidnx -nd shown in the accompanying drawings, in which,

Figure l is a longitudinal elevation of a section of concrete showing the bar embedded therein. Fig. 2 is an enlarged perspective view of a. portion of the length of one form of the bar; Fig. 3 is a transverse section of the same; Fig. 4 is a perspective view of a por tion of a modification, and Fig. 5 is a transverse section of Fig. 4. Fig. 6 is a perspective view of a modification.

Referring to the drawings, A represents a section of concrete or other suitable construction in which the reinforcing bar B is embedded for strengthening'purposes. As shown the bar is twisted in order tp raise the elastic limit and thereby stiffen the whole member. In cross section the bar may be substantially rectangular or square, or any other desired shape, and along one or more of its surfaces sides or edges, lugs or projections 0 are formed adapted to become embedded in the concrete and thereby hold the bar more securely in position, and enable the concrete to secure a lirmer hold upon the reinforcing member.

It is a well established fact thatwhen twisted bars or rods are subjected to great stresses there is a tendency of the metal to turn and assume the form it occupied before being twisted. When such twisted rods are embedded in concrete the smooth surfaces only, are depended upon to resist this tendency, but when lugs are placed on the smooth surfaces, in accordance with this invention, the resistance to this tendency is immensely increased. It is of great importance to maintain the rods-or bars'in a fixed position because when they begin to move in the manner described, the value of the concrete structure which they reinforce is greatly impaired. It will be seen therefore that the lugs on a strength, which not only resists the tendency of the bar to pull through the concrete, but also prevents the rod or bar from turning or untwisting. It will also be seen that when the lugs are most distant from the axis of the bar, their position gives them special eiiiciency in resisting the tendency to untwist when embedded in concrete. Furthermore, because of the twist in the bar, these holding lugs or projections C are out of line with each other and thus afford a great resistance to longitudinal pulls on the bar. The pull on the bar is resisted by a mass of concrete behind each lug so that the bar is not liable to be pulled through the material in which it is embedded. i

In Fig. 2 the lugs O are shown triangular inform, but i the invention is not limited to any particular form of lug, and they may be rectangular as shown zit I) in Fig. 4. Any suitable method may be utilized in forming the bar, as by means of suitably constructed rolls adapted to roll the lugs out of the metal of the bar.

In Fig. 6 a modification is shown in which the lugs are arranged on the faces instead'of the edges of the bar, and in all cases the lugs maybe staggered. I

Obviously some features of this invention may be used Without others and the invention may be embodied in Widely varying forms.

Therefore, without limiting the invention to the devices shown and described, and without ennmerating. equivalents, I claim and desire to obtain by Letters Patent the following:

1. A twisted reinforcing bar of one piccefor concrete and other masonry constructions, provided with lugs or projections integral with the body of the bar.

:3. A twisted reinforcing bar of one piece for concrete and other masonry constructions, provided with oppositely arranged lugs or projections integral with the body oif the bar.

I). A twisted reinforcing bar of one piece for concrete and other masonry constructions, provided with oppositely arranged lugs out of line with each other and intc gral with the body of the bar.

4. A twisted reinforcing bar of one piece for concrete and other masonryconstruction, provided with means for preventing the metal l'roin rotating.

5. A twisted reinforcing bar or one piece for concrete; and other masonry constructions, provided with means for preventing the metal from rotating and nntwisting.

6. A twisted reinforcing bar of one piece for concrete and other masonry constructions, provided with means for opposing the tendency ol' the bar when embedded in'a concrete structure to rotate under stress.

7. A twisted reinforcing hat; of one piece for concrete and other masonry constructions, provided with pro icc tions on its surface integral with the body of the bar, whereby the tendency ol' the bar'to rotate under stress is opposed when embedded in a concrete structure.

In testimony whereof I have signed this specification in the presence of two subscribingwitnesses.

Witnesses:

J. W. BLACKBURN, '1. J. Mover.

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