US1311864A - Reintorcibtg-bab - Google Patents

Description

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PAUL KUHN E, OF BIRMINGHAM, ALABAMA.

REINFoncnvG-BAR.

Specification of Letters Patent.

Patented July 29, 1919.

Application led October 1, 1918. Serial No. 256,413.

To all whom t may concern:

Be it known that I, PAUL Knr-INE, a citi- Zen of the United States, residing at 2520 15th avenue, South, Birmingham, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in Reinforcing-Bars, of which the following is a specication.

This invention relates to improvements in reinforcing bars.

The prime object of the invention is to provide a reinforced bar so proportioned and constructed as to eifectually distribute the tension throughout the structure when 1n use.

A further object of the invention is to provide a reinforcing bar with a round body portion, and distributed on the periphery thereof a plurality of longitudinal projections so disposed and proportioned 1n section and length to the diameter of the bar that every ounce of steel is in tension when the bar is in use.

The invention also comprehends improve- `ments in the details of construction and arrangement of the specific parts, which will be hereinafter described and particularly pointed out in the claim.

In the drawings Figure 1 is a detail perspective view of a portion of my improved bar.

Fig. 2 is a cross section on the line 2-2 of Fig. 1.

Fig. 3 is a cross section on the line 3--3 of Fig. 1.

1 indicates a bar.- The main body portion 2, thereof is cylindrical in cross section. On the periphery of the cylindrical portion 2, are preferably two sets of longitu inal projections 3 and 4. The sets of projections 3, are each spaced apart at 5, and each projection is semi-circular in cross section. The sets of projections 4: are spaced apart, as at 6, and are in every respect the same as the sets of projections 3, except that the projections 4 are disposed in longitudinal alinement with the spaces 5 between said sets of projections 3. The result of this arrangement is the formation of a plurality of alternately disposed longitudinal projections on the periphery of the bar, the amount of metal being such as to equalize the cross sectional proportions in such manner that tension is distributed throughout the whole structure when the bar is 1n use.

When the bar is embedded in concrete, the latter becomes pocketed between the projections, and a plurality of concrete ribs or projections are produced between the projections on the bar, hence the bar is prevented from rotary or lateral movement. Because of the formation of the concrete ribs or projections bein disposed in alternate longitudinal order gbetween the respective sets of projections on the bar, longitudinal movement of the bar is absolutely impossible. It therefore follows that when a bar such as described is embedded in a body of concrete, the bar and concrete become fixed with relation to each other, and thactl the tension of the bar is equally distribute What I claim is A reinforcing bar comprising a cylindrical body portion provided on its periphery with spaced apart longitudinal projections, each projection being semi-circular in cross section and flat at its ends, each succeeding set of projections terminating in circumferential alinement with the beginning of the adjacent projections, and the projections of one set being disposed in line with the spaces between the projections of the adjacent set.

In testimony whereof I aiiix my signature.

PAUL KUHNE.

(topics of thispatent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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