US1282616A - Reinforcing-bar. - Google Patents

Description

F. MURRAY,

RE IIIIIIIIIII RI APPLICATION tD APR. 22, 1918. 1,282,616. Patented 00t.22,1918.

'. k k J5 roils.

BEST AVAILABLE COPY w th CHARLES F.-MUBRAY, F EVANSTON, ILLINOIS, ASSIGNOB TO PAUL J. KALMAN COM- PANY, OF ST. PAUL, MINNESOTA, A COPABTNEBSHIP CONSISTING 0F PAUL J.

KALMAN AND GEORGE E. ROUTE, R.

' enmroncmerae.

Application filed tpril 22, 1315.

Z '0 all whom it may concern:

Be it known that 1., (lemme F. MURRAY, a citizen of the United States, and resident of Evanston, in the county of Cook and State of Illinois, have invented certain new andyusefui Improvements in Reinforcing- Bars, of which the following is a specification.

My invention relates to reinforcing bars for concrete and more porticuiariy to a her having a novel rib construction.

It is becoming the practice among engineers in their specifications for reinforcing bars to require that the same shall be pro vided ivith transverse ribs of substantiai size, the use of diagonally disposed ribs of all sorts not being favored. In view, hoW ever, of the peculiarities of the process of rolling andof the necessity for great speed of production, it has heretofore been found impossible to roll bars having transverse ribs Without distorting the ribs and seriously affecting the efficiency thereof. Not only is the efficiency of the rib reduced by such distortion but an equally serious objection is made thereto because of the loss in power due to interference between the bar and the rolls and the consequent rapid Wear of the The cost of producing rolls is high and the necessity for constant renewai of the rolls adds materially to the cost of production of the bar. Furthermore, the loss in power due to the frictional resistance resultin from the distortion of the ribs is great and may amount to to of the total power. I

An object of this invention is to so desi'gr. a transverse rib that there wi l be no-distort-ion thereof in rolling and consequently wear on the rolls and iess ioss or power in rolling. The rihis designed to meet the toilowing rolling conditions; it will be understood that reinforcing members such as cominoniy used today are formed by passing a heated oar hetween a pair of rolls, one-half of the pass being contained in each roll. The har u'hich is fed into the rolls is of anywhere from '25 to iarger cross sectional area than that of the bar which issues from the ass. This is necessary in order that there will sufiicientmaterial to fill the grooves in the roll and form the ribs on the bar. It will he understood also that the grooves which serve to term the ribs on the line Specification of Letters Eatent.

Fatented Get. 22, E318 Serial No. 230,117.

1 must be arranged radially of thereil anc consequentiy that the grooves are in with the ribs formed on the her only at onepoint; that is, at a point coincident with a line intersecting the axes, of the two rolls; furthermore that the angularity between the groove and the rib formed thereby increases with the enguiarity of the roll: due to the tangential movement of the bar. The diiii cuities arising from this fact are increased due to the fact that the reduction in size of the be! implies and necessitates a corresponding elongation of the bar; that is, theoreticeiiy if there is a 25% reduction on the bar in the roils, the bar should issue from the rolls 25% faster than it enters and correspondingiy faster than the peripheral speed of the rolls. it. has been found that the elongation of the formed bar as it emerges from the roll is not proportioned to the amount ofreduction, hui is approxi mately 4 to in excess of the periphery of the rolls at approximately 30 1; reduction. The effect of the increasing anguiarity between the groove in the roll and the rib on the bar and the increase in speed of travel of the rib over the peripheral speed of the roll results in Wiping off or distorting the portion of the rib which is not yet freed from the roll. A rib constructed as de-' scribed herein will not be distorted and "wilt be freed from the roll\ without conflict thereit with,

The ditiicuities in designing a rib which u'iiinot he distorted by the roiifare further increased when the surface by which the rib formed is disposed at an Rfiiifl? of so proximateiy to axis-ofrotation of the roii. fihis has the etiect upon relative moVeinentbet-Ween the her and the roll of moving a pointwithin the groove on the mil ()6 in a path which is hie-lined with relation to both the iongitudinai and transverse axes of the rib which has been termed in the groove. Thus it follows that the rib in order to be freed from the roll Without disthat the rib should he prwxidcd on its in livery s de with a double lllf'ilfifi A The foregoing description xvii understood by reference to the accompanying drawings, wherein:

I igure 1 is a transverse sectional view through a pair of rolls in which a bar constructed in accordance with my invention is being formed;

Fig. 2 is a sectional view on the line 2-2 of Fig. l;

Fig. is an irregular sectional view on the line of Fig. 1;

Figs. 4, t3 and 7 are views somewhat diagram!natical in form but in cll'cct talten on the line ot' 2. the bar being shown in full lines and th ditl'crent positions of the groove in the roll with relation to the rib being shown in dotted lines;

8, 9, 10 and .11 are views tztlitli on the lines 83. 9- lt)--1tl and 11-11 oi Figs. -t, 5, 6 and 7 respectively.

The bar is shown as being generally rcc tangular'in outline although it may be made round if desired. It preferably provided with a main or body portion 10. having four diametrically opposed longitudinally extending corner ribs 11. The longi tudinal ribs are joined by directly transverse ribs 12, one face 13 of which is substantially perpendicular to the longitudinal axis of the. bar While the other face 14. is inclined both in relation to the longitudinal axis of the rib and the transverse axis thcreof. From a strict technical standpoint, the surface of the rib should be cycloidal, but from. a practical standpoint this is immaterial and unimportant. At one end the rib is substantially complete: that is. it has a vertical face and is of the full width. At its top the rib is lessened in thickness on substantially a straight line to its opposite extremity. The width of the rib at its top is immaterial and at the point of greatest inclination it may be relatively thin it desired. Inasmuch as the angle at the point of greatest. inclination would never be more than 45, the strength of the rib will be suiticicnt. particularly in view of the tact that it is anchored to the longitudinal rib 11. at that point.

It will be noted that the bar is formed by passing the same between the rolls 15, us. each of which has one-half of the pass formed therein. In effect therefore. onehalf of the bar is formed in each roll and as the ribs 12, are located at an angle 45 to the axis of rotation ot' the rolls. the ditficulty in freeing the. ribs from the roll will be apparent. The motion of the parts from the point at which the formation of the rib is completed to that at which the rib is entirely free from the roll, are shown in Figs. & to 11 inclusive. In Figs. at and 8 the rib and a e are coincident, the views being taken at the point where the line through the longitudinal axes of the ribs is parallel to the linethrough the axes of the rolls. In l igs. 5 and 9, however, it will be seen that the groove. indicated by the dotted line 17, has shifted both longitudinally and transversely of the rib and has moved away from the rib to the extent indicated by the space 18,'in Fig. 9. This peculiar movement continues. as shown in Figs. 6 and 10. until at. the point shown in Figs. 7 and 11. the roll is free from the rib.

The point l9, of the roll, which is a point on the extreme periphery. remains substantially in contact with the rib until the roll has moved entirely out of contact with the bar. and as this point on the roll has considerably greater peripheral speed than the. inner point. due to its greater distance from the axis of the roll. it would contact with the rib and distort it were it not for the fact that the bar moves substantially 4% faster than the peripheral speed ot' the roll. llecause of this there is no distortion of the bar by the angular movement of that point of the roll.

The foregoing description has reterence solely to the method ot' torn'iing the roll in order to produce a bar having ribs such as described and is thought to be necessary in order to enable those skilled in the 'art to produce such a bar.

I claim:

1. A reinforcing member for concrete. comprising a bar having spaced. transverse ribs thereon. said ribs having one tare which is substantially perpendicular to the 'lacc ot the bar. and one taco oi which is inclined longitudinally and vertically. sul islantially as described.

2. A bar having transverse ribs. one l'acc of which rib is perpemlicular to the bar and the other face is inclined longitudinally and vertically, the double inclination being such that the ribs will be freed from the rolls without distortion, substantially as (by scribed.

3. A reinforcing member comprising a bar having spaced. trans vcrsely extending ribs thereon, said ribs having one face which is substantially perpendicular to the face of the bar whereby to provide an extended straight bonding sur face. and the opposite face of said ribs being inclined longitudinally and vertically, whereby the forming rolls will be freed tron] the ribs without distortion of the latter. substantially as described.

Signed at Chicago. Ill., this 20th day of April 1918.

CHARLES F. \IURRAY. \Vii ncss:

T. D. Burcnn.

for concrete,

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