US1280725A - Reinforcing-bar for concrete. - Google Patents

Description

' reseas.

J-OHN- F. HAVEMEYER, F ARDSLEY-N-HUDSON, NEW YORK.A

REINFORCING-BAR F028. CONCRETE.

j Be it known that JoiiN F. HAVEMEYER,

alcitizen of the [Tnited States, and a resi dent "of Ardsley-omHudson, of. the count-y of Westchester and State of New York, .have -invented an Improvement in Reinforcinglllars for Concrete, of which the following description, iii connection with the ac conipa'nying drawings. is a specification. like letters on the drawings representing like parts.

The present invention relates to an im'- provement in reinforcing bars for concrete construction. one object being to provide a deformed bar which may readily bebent, to conform to curved portions o f a structure.

ln the drawings which accompany this specification I have illustrated several forms of bars emhixlying my invention.

Figure l is a plan view of such a bar. Fig. 2 a cross section on the line 2-2 of v Eig. 1. f'

Figs. 3 and Je are similar views of a modification.

Referring now to Figs. 1 and 2, the bar there illustrated has a deformed portion on each of its faces.y the deformations comprising a series of` projections 1 rising from nor- Amally plane surfaces A continuous flange or ridge 3 also-rises above the normal siii'- face and dxmiids longitudinally of the bar, and at a height equal to or greater than the height of the projections 1 \Vhile the bar forming the subject matter of the present invention may be used on any type of reinforced concrete work, it is particularly adapted for reinforcing curved structures. In bending reinforcing steel for use on such structures, it is customary to pass the bars through a series of bending rollers to give them the desired curve. However. in passing deformed or irregularly shaped bars through the bending `roll-` ers. considerable difficult-y has been experieuccd on account of the projections or deformations which choked the rollers,7 not only injuring the latter but also tending to flattenl out the deformations on the bars. Referring to Figs. 2 and 4 of the drawings. it will be clear that a har formed according to the present invent-ion. iii` passing through a set of bending rollers. will engage the surface of these. rollers with uninterrupted hearing surfaces provided by the continuous tracks or ridges il. while the deformations l do not Spcification of Letters Patent.

Patented oct. e,y isis.

'Application filed October 17, 1914. Serial No. 867.065.

necessarily come into actual Contact With the rolls. Thus a bar can be bent easily both without pounding and without damage tions rimning longitudinally as s hovvnend` overlapping in the manner indicated, a bar l of practically constant cross section is produced and the projections enter directly into its tensile strength. lt. may be pointed out that. if these proj ect-ions were directed crosswise of the bar they might constitute an effective mechanical bond but would not enter materially in the tensile strength of the bar. .-\ccor iling to my "invention, howeverg not only is an etfective bond provided by the substantially longitudinal projections but these projections also contribute materially to the tensile strength. Aside from the a ditional strength/ given to a reinforcing bar hyvirtue of the longitudinally disposed prof jections, this vparticular placing of the projections simplifies the rolling of such bars. considerabil i The projections in the present ase are illustrated as being oblong oi lozenge shaped inabove, described. although itis obvious that the, shape of the projections and their relative positions are not necessarily limited to those here shown to produce a bar Withinthe conceptY of my invention.

Among other advantages inherent in reinforcing bars fashioned in accordance with in v invention., it maybe pointed out that such bars may conveniently be used in reinforcing concrete beams or other part-s of a structure to supplement bars of any well-v known cross sectional shape.v Moreover. in the.construction of silos'. sewers. grain elevators and similar curved structures, the comparatively extensive hip or joint ordinarily made at the intersection of `two si'iiooth or undcformed bars 'an be substantially' shortened where deformed bars are used, and consequently the weight of metal necessary in a given structure is materially decreased. Thus, a reinforcing bar made in accordance with a preferredl 'form of my invention provides a reinforcing element of superior strength andI at the same time makes possible a substantial economy over the use of plane faced square bars which have heretofore been largely employed in reinforcing curved structures.

I claim as my invention:

1. A reinforcing-bar substantially square in cross section andhaving a pair of straight longitudinally extending ridges along each edge and a plurality of relatively small deformations, separate from each other and from the ridges? on at least two of 'fs adjacent faces, the ridges being of uniform height and extending beyond the tops of the deformations, whereby the bar may be passed smoothly between bending rollers and be vbent without interfering with the deformations. v

2. A relatively fiat bar substantially Square in cross section and having a pair of longitudinally extending ridges on each of its edges and a plurality of relatively small separate deformations between each pair of ridges and arranged relatively to each other to preserve a uniform cross sectional area throughout the bar, the ridges being of uniform height vwhereby the bar may be passed smoothly between bending rollers and be bent without interfering with the deformations.

ln testimony whereof, l have signed my name to this specificatioii, in the presence ot' two subscribing witnesses, this 15th day of October, 1914.

' JOHN F. I'IAVICMEYER. Tit-nesses c HARRY L. MCGEE, C. lV. 'WiNnrninrxll'r.

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