US1107434A - Bar for reinforced concrete construction. - Google Patents

Description

H. G, MEADOWS. I BAR r013. mzmroacnn comcnn'rs cons'rnucnon. APPLICATION FILED 1330.19, 1910.

l lQ7,4=34 Patented Aug. 18, 1914.

' I ammo z Hamid Gjklzdows wi/wwaea v I I v W Y [is arm,

"UNITED STATES PATENT OFFICE.

HAROLD G- MEADOWS, OF BUFFALO, NEW YORK, ASSIGNOR TO JOSEPH G. DUDLEY, OF

a BUFFALO, NEW YORK,

BA R FOR REINFORCED. CONCRETE CONSTRUCTION.

To all whom may concern:

Be it known that I, HAROLD Gr. MEADOWS,

of-the city of Bu'fi'alo, in the county of Erie and State of New York, have invented certain new and useful Improvements in'Bars for- Reinforced Concrete Construction; and I do hereby declare the following to be a full, clear, and exact description of the same,

reference being had to the accompanying drawings, forming apart of this specification, and to the reference-numerals marked t-hereon.

M present invention relates to bars for rein orced concrete constructlon and has for its ob ect to' provide a construction which will make an ideal bond with the concrete to resist stress. from any direction, and one which may be readily and chea ly manuas the manufacture of the bar is concerned,-

itis'necessar -that the texture of the metal "sectional area should be reduced to a mini- ,factured by the use of rolls an which is ready for use when it leaves the rolls. In providing a bar of this nature, it is necessary to consider not only the surface of the bar itself, but also the surface of the concrete incontacttherewith and the action of the concrete when being poured around the bar, It is well known that concrete will not flow into every little hole or pocket that may be made in the surface of the bar, but may be kept out by air and water entrained in the concreteand also it'will be noted that v concrete itself is not perfectly fluid. Therefore, in order toobtain areliable bond be tween'the metal and'the concrete, it is necessary to have the spaces betweenthe ribs on' ,the surface of the bar of substantial size, to have the ribs that outline the spaces of substantial, dimension, and to have the surface of the concrete that is in contact with the bar broken'in no way other than is absolutely necessary to make the bond. So far forming the bar should be'as nearly as possible homogeneous throughout, and to obtain this condition, sudden changes in cross mum, for, if in rolling the bar, the work required to form the IlbS, or projections, as

the case maybe, changes suddenly as the bar passes through the rolls, owing to Specification of Letters Patent.

' I Application filed December 19, 1910. Serial No. 598,091.

Patented Aug. 18, 1914.

vided with too great a number of ribs and intervening ockets, thereby breaking up the concrete sur acein contact with the bar unduly, and either utilizing too large per cent. of the metal in forming the ribs, or having the ribs too-small and too delicate for practical manufacture and use. This form of construction also calls for rolls whose surfaces are cut up to such an extent that they are not only expensive tomake but also very short lived, thereby entailing an excessive initial expense and decreased output due to frequent changes. It is also desirable that the arrangement of the ribs or projecting portions of the bar be symmetrical with reference to the longitudinal axis, and so arranged as to resist a pull or twist from'any direction equally on opposite sides thereof,

WVith these objects in view, I have produced the bar shown in-the accompanying drawings, which is characterized by having V-shaped ribs with substantial dimensions formed on two adjacent surfaces of the bar, the apexes of the V s being arranged at the apexes of the adjacent V shaped ribs thus formed extending alternately in opposite directions, longitudinally of the bar. I prefer that the V shaped ribs on the other pair ranged with reference to. each other, and also diametrically opposite the first ones mentioned, as will be hereinafter more fully described.

In the drawings :Fi 'ure 1 is a perspective view of a steel mem er for concrete bar constructed in accordance with my invention. Fig. 2 is a View looking down upon the two adjacent faces made by the, same roll. Fig. 3 is a side elevation. Fig. 4 is a cross sectional view on the line H of Fig. 3. Fig. 5 is a developed view showing the ribs and the manner in which they cooperate with the concrete in contact therewith and 100 Similar reference numerals in the several 105 figures indicate similar parts. 4

I prefer to employ my invention in connection with bars which are rectangularvin cross section and theseare formed as usual by rolls, the passes of which are rectangular 1 0 meeting point of the two surfaces'and the r of adjacent faces of the bar he similarly aras upon each of its faces, 1, 2, 3 and 4, a I plurality of ribs 0: and b extendingabove the surface of the bar and at an angle to its longitudinal axis, the adjacent ribs on each slain faceextending diagonally in opposite irections, so that the spaces between are of substantial area. The two adjacent surfaces 1 and '2', are preferably formed by the same roll, (as shown in Fig. 2), and the ribs .a

. on these faces meet at the edge, angle or cornerof the bar. Each succeedingV shaped v rib. thus formed extends in theo posite direction from the preceding one. he ribs I) on the opposite slde of the bar, which are formed by the other one. of the air of rolls, are preferably arranged directl opposite the ribs on the surfaces 1 and 2, and the ends of the'ribs b on the adjacent surfaces 3 and 4, preferably meet the ends of those on the surfaces 1 and 2, so that at each corner or angle there are presented oppositely disposed V shaped ribs, making the bars as a whole symmetrical, and the spaces between the ribs and with which the concrete is in contact, substantially the shape shown in Fig. 5. From an examination of this figure it will be noted that the concrete is in conthe bars, and arranged as shown, also in-.

sures the production of efficient angular ribs, etc., even if the rolls or bars should creep in rolling or the metal should flow unevehly in or on opposite rolls, the construction produced under these circumstancesbeing substantially like that shown in the developed view Fig. 6. In this instance, the arrangement of the ribs is such as to prevent the relative movement of the bar and concrete through forces exerted in any direction while the areas of concrete in contact with the surface of the bar are large, and this though produced by the improper action of the rolls accentuates the fact that not only is the intended construction of the bar as a whole illustrated in the other figures of the drawing, advantageous, but that the features of construction are such that good re-' sults are obtained *even when the manufacture isdefective for reasons beyond the control of the operator. I v

The bar constructed as described possesses the following features of importance: It is symmetrical with reference to its longitudinal axis and thus produces an equal strain on both sides of the bar and the concrete envelop. Its surface is formed of substantial diameters spaced a substantial distance apart and it will break up the concrete sufliciently for the maintenance of a perfect bond between the concrete and bar. The ribs on the bar are so arranged that they will bemade gradually-and the metal dis tributed along some considerable proportion of the length of the bar, thereby minimizing the setting up of strains in the metal, due to a sudden variation in the section of the bar and this is contributed to by the fact that the sides of the ribs form an obtuse angle with the surface of the bar in order tov allow the metal to flow ,in 'the grooves that form the ribs and also that there are no pockets formed by the ribs that will catch the water and air entrained in the concrete to the exclusion of the concrete itself and therefore a more firm joint will be provided .with the two materials. t

It will be noted that with the V-shaped ribs of substantial dimension, spaced and arranged as shown in the bar, theseribs form a'practically continuous zigzag rib of uniform cross section around. the bar which is only broken at the two opposite corners that correspond with the parting between the rolls by which the bar is formed, as shown particularly in Fig.3. I I

The specific form of the cross section of the ribs, that is to say, whether round, angular or otherwise is not of great moment, but it is desirable that the sides be inclined to the plane of the surface of the bar in order to facilitate the operation of rolling them. It is also desirable that a cross section of the bar, as a whole, be angular and preferably rectangular in order to reduce as much as possible the liability of a relative twisting between the bar and the concrete, but the advantageous results of my construction would be obtained in a measure even if the bar were round or did not have the sharp corners, and in such a bar with rounded edges the two adjacent surfaces,

, corresponding to the surface indicated by 1 and 2 in the angular bar, will be those on opposite sides of lines drawn through the apexes of the V, or other shaped ribs.

It will be understood that the term V shaped, as applied to the ribs, is only approximately descriptive and is not intended to limit the construction to one in which the ends of the ribs necessarily merge at an acuteangle, but merely to one in which the same results are obtained in respect to the projections,

aromas wed 'n' uction, which resists the relatively tions of the bar immediately adjacent ta the line. extending longitudinally of the bar and two series passingthrough tlieapexes of the VS; in other words, constituting the'part which, in the angular formation of the bar shown, is formed by one of the rolls. 7 I claim as my invention: Y

. 1.1Abar iforyreinforcedconcrete having I I of, substantially V-shaped ribs substantially diametrically opposlte each other,.the apexes of the longitudinally adja- "cent- Vs, projecting in opposite directions and the ribs at said longitudinally of the bar considerap'exes being wholly separated a able distance from each other;

2. A bar for reinforced concrete having I two series of similar V-shaped ribs arranged substantially opposite" each other, the apexes of the longitudinally adjacent Vs in. each series extending alternately in opposite directions longitudinally "of the bar and the ribs at said apexes being wholly separated a v considerable distance from each other.

3. A bar forv reinforced concrete, angular in cross-sectionand having two series of ribs on each face', occurr1ng alternately, those of vone ser es being inclined 1n oppo- ..site direction to those of the other series, longitudinally in respect to the axis of the bar, the corresponding ribsextending in opposite directions on adjacent. faces, meeting at the edges, angles or corners of the bar,

and bein' wholly separated at this point a considera v points of the next adjacent pair of ribs.

4. A bar vfor reinforced concrete, having a plurality of ribs forming bands extending around it and] site directions relatively to the longitudinal axis thereof, forming a series of V-shaped the apexes of the V s of adjacent bands extending longitudinally of the ing corner 7. A bar for reinforced concrete,

I adjacent faces, 1e distance from the meeting of a plurality of straight members that meet,

inclined alternately in oppo-.

bar and in opposite. directions and the ribs of each band being Wholly separated a considerable distance from each other.

5. A. bar for reinforced concrete, having a plurality of ribs extending around it in the nature of zigzag bands, each band composed of a series of straight ribs meeting, and changing directions at the corner of the bar, saidba-nds being a considerable distance apart at their nearest points, and each having the apexes of the VS, formed at the corners of the bar by the meeting of the ribs, point in opposite direction, longitudinally of the bar, to that of the V at the correspondin the next adjacent band.

1 .6. A bar for reinforced concrete angular in cross section having a series of substantially V-shaped ribs between each pair of adjacent faces thereof, the apex of each V projecting longitudinally of the bar in an opposite direction to, and the ribs being wholly separated a considerable distance from, the apex of the next adjacent V on the same pair of faces.

angular in cross section, and having on each face a row of 'narrow ribs extending across the facein a plane inclined relative t'o'the longitudinal axis of the bar,'the ribs in said row being divided into two series, those of one series being inclined in opposite directions to, occurring alternately with, and being "separated a considerable distance from those of the other series; all ribs being'so arranged that each will extend at an angle to and its ends will approximate the ends of one of the other series on each of the next forming a series of zig-zag bands around the bar, each band composed or nearly meet, and change direction at each corner of the bar. r

'- copies of this patent may-be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0."

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