US1477378A

US1477378A - Deformed reenforcing bar for concrete

Info

Publication number: US1477378A
Application number: US502185A
Authority: US
Inventors: Carl G Ohlson; Alfred E Jupp
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-09-21
Filing date: 1921-09-21
Publication date: 1923-12-11
Anticipated expiration: 1940-12-11

Description

De@ u", w23. M7137@ C. G. OHLSON ET AL DEFORMED REEN-FORCING BAR FOR` CONCRETE Filed Sept. 2l 1921.

INVENTORS Patented l'lec.` il, i923.

STATES ignara retratar critico CARL G. OHLSON AND ALFRED E. SUPP, OF YOUNGSTOWN, OHIO.

DEFORMED REENFORCING-BAR FOR CONCRETE.

Application led September 21, 1921.

To all whom it may concern:

Be it known that we, CARL G. (lr-inscri and ALFRED E. Juri?, both citizens ci the United States, residing at Youngstown. in the county of Mahoning and State of Ohio, have invented a new and useful Improvement in Deformed Reeniorcing Bars for Concrete, oi? which the following is a full, clear, and exact description.

Our invention relates to reenforcing bars for concrete of `the type having substantially uniform cross-section and tensile strength.

Heretofore in such type of bars the sub- M3 stantial conformity of cross sectional area has been obtained by shaping the bar so that one portion counteraoted another portion at each cross section; for example by a recess in one portion counteracting a projee-tion in another portion, at the same cross section.

Our invention is designed to provide such a bar with a plurality of portions having undulations so arranged that the transverse section of each of said portions is substantially constant throughout the length ot the bar: so that each portionis self compensating.

A further object of our invention is such an arrangement that the portions referred to in the last preceding paragraph constitute the entire bar, and may be placed in any longitudinal relation to each other, and a bar of substantially uniform cross-section and tensile strength will be produced. That is to say, the portions themselves are selli compensating, and have a substantially uni- `form transverse cross-sectional area at every point, and therefore the longitudinal relation of the portions with respect to each otheris immaterial as far as it affects the sectional area and tensile strength of the bar. This is of importance in making such deformed bars as the rolls used sometimes slightly displace the port-ions of thevbar in the forming thereof.

Further objects of our invention will be apparent upon reading the following description taken in connection with the acof Figure L companying drawings which illust-rate two serial No. maier'.

Figure 3 is a view similar to Figure l with the bar rotated 90 degrees;

igure i is a cross-section on the line lV-FV of Figure 3;

Figure 5 is a side elevation 4ot a different form of bar embodying our invention;

Figure 6 is a. cross section on the line Jl- Vl of Figure 5;

Figure 7 is a side elevation of the bar of Figure 5 which has been rotate-d 90 degrecs; and

Figure 8 is a cross-section on the line VHF-VIH of Figure 7.

Figures 9 and 10 represent some. geometrical figures Jfor illustrating the segments used in the bar. V

Referring to the drawings, the' bar shown in Figures l to 4: comprises a series of segments l and 2 of tores of elliptical cross section. The segments 2 are preferably placed in line with each other, one on each side of the center line of the bar as shown in Figure 2. The segments l are similar to the segments 2 but are placed, in the bar shown in Figures 1 to 4f, inclusive, 90 degrees Jfrom the segments 2 transversely oi the bar and are staggered. longitudinally of the bar relatively to the segments 2. That is to say, the highest point 3 of each of the segments 2 is equidistant from the highest points l of acent segments 1 and, likewise, the highest point 4l of each of the segments l is equidistant from the highest points of two adjacent segments 2.

The segments 2 are joined at their ends by ribs 5 which are deepest at their central parts, and similarly, the segments l are joined at their ends by ribs 6.

The bar shown in Figures 5 to 87 inclusive, is in principle the same as that shown in Figures l to 4, inclusive, in that each portion is selt compensating; but the segments are of different shape; This bar comprises segments 10 which are opposite each other and segments 11 also opposite each other, the segments 10 and 'll being staggered longitudinally with respect to each other in the same manner as described with respect to segments l and 2. rlhe segments l0 have ribs l2 connecting the same, and the segments l1. have ribs 13 connecting the same. I'lhe segments and ribs give longitudinal trough-like undulations, and by reason or" the peculiar shape of the

segments

10 and 11, this trough runs in zig-zag form the en tire length bf the bar butvaries 'gradually 'in extending from the positionf shofivnini Fgure 6 to that shown in Figure 8 andy generally along the line l5 which represents Vits lowest point".

For the purpose of illustrationvthe bars may be divided as shovvn by the lines A A' and B B. rhe portion() between theflines,

A and B has its surface undulations so arranged that that portion is constant-in crosssection on anytra'nsverse line throughout the length of the bar and the portion-C may or may not be the sainein crosssectional area as the portions D, E and F. ln other Words,A the yarrangemen't of' the undulations is such that a specified-portion ofthe bars is self-compensating as toits sectional area:

By reason of this principle, the sections. C,

ILE and'Fmaybe placed at anylongitudinal relation to each other and a bar of uniform total cross-sectional area secured.- This feature has a marked commercial-value" in that f theu undulations; arev produced in' thel barv by mea-nsy of rollsL carrying? the: configurations; Ordinarily the device is madeby passing the s-arnef through two rolls, the configuration for one'vhalf beingon-oneroll andthatof the' other half on the otheifroll.l` It sometimes happens that f the rolls' slip with!` respect to i each other, inrvvhichieventif' the tot-alerosssectional' area depended uponi-anfgaccurate matching Aof the two rolls? a uniform crossV sectional lbarwould not be obtained llllith if tions "constituting the bar is therefore unit" our, invention it is immaterial whether the rolls match-ori not` since: each specified porltin. of the ,bai` isselffcompensating andthe resultant of the: combinationy of those` pon form quite.` independently of' the' longitudi na'l're'lationx of the portions to eachother. lf a conic, suchias 16 in Figure 105 revolvesaabout anaxis in the plane" of one; of

- its axes.y the'bodyy generatedfin this manner is aliled there.. Any part thereofincluded by af plane and any' portion of the-feurived sur: face maybecalled; aseginent 11'? of a tore'.- j

Eachgsegment ofv our'bar has,4 as shown Figures 9 and 1105 a curved surface Which isnpfart of. the surface of a tore, and also, a flat sur-facev which is produced by acutting pl'ane'.V Taking two' segments and'. placing theinfifl'it surface against flat surface,A and then'following at' a predetermined distance with two other" segments placed flat surface against? flatqsurfacef" and staggered Withfre spect tot` the nrst segments;` asshown in Figures I, tcl8,-wve,have,vvithI the exception of 'l lthe rlongitud'i'nalIrilbs,.the composition of the #Thepcjo tour, of the sections constituting the'I barf' may beanything eXcept/acircle or square. The useuof 'segmentslof squarev or circular forinfvvould notgresult in a surface having theI` desirable quali-ties l for such a bar becaisefjthe surface't would not be" continui ously varying.

such formthat the dies fromvvvhichthey are u rolled'vhave an unusually" long life in that thereare no sharp points ori, angles to ybe provided for. Many, other advantages' will suggest themselves to those sliilledf inthe art. The surfacey configuration of thebar and` the arrangement ofv the. parts yare', 'such that. the bar as ai'Whole'hasthroughoutfits length a constant section'inodnliis about' any axis at rightlanglesto the longitudir'iall axis ofthe har.L i

Thetvvobarsf illustrated in the arefmerely examples, -and" We vvish it toibo understoodlthat lWe are .not tov be limited'to thev particular. arrangements shown; as many variations. may be made in the configuration of the segments and their arrangement ywith respect tol each other which will efnhody the principlesyofr our invention and'va considerably in appearance from the illus"L trations shown.v

l.y A- deformed. concrete reenforcinghalr composed of a plurality ofportions eao'hfcon-I stitutingV lessthan onefhalf. of the aiea-fof the'bar, ythe transverse cross-'sectional'. area of each of said portions being.. substantially consti-anty throughout' the lengththereof; said bar having ribs between said portions: substantially as described-.f` l y, l i Y 2.V A deformed concrete bar: havingM aV plu.- r'allityof rows of surface undulations so arrangedi that the transverse sectionaly areak of that portion lying. between planes, cutting the centerliney of adjacent rows isl substantially vuni-form throughout the length ofthe y bar, the undulations varying transversely curved! lines acrolssftheface in each.V 4said portion,y substantially asj described.; g

3;.; A concretel bar :of substantiallyuni.-

form cross section and. tensile strength'yeoinf y posed of a plurality ofselff-compensating portions. eachI portion having. on every vtrafnsverse section a curved configurationwhichv vari esf'yvith. respect tofasurface jot any outline beth longitudinally and. transverse-r w ly in a substantially continuous naar1111er'75 sub1- stantially as described. f

4L'.y A concrete bar-.ef substantially unil forni cross section and tensile strength, cornfp'osed of a plurality of,self-compensating portions having a curved surface `pageevery transverse section, the section modulus berer/7,37@

ing approximately the same along the bar, so that the resistance is equal to bending stresses in any radial direction throughout its length, substantially as described.

5. A concrete bar of substantially uniform cross section and tensile strength, composed of a plurality of selfjcompensating portions, each portion having a surface coniiguration which varies both longitudinally and transversely in a substantially continuous manner, and surface ribs between the said portions, substantially as described.

6. A concrete reeni'orcing bar of substantially uniform cross section and tensile strength, composed of a plurality of selfcompensating portions, having oppositely disposed ribs and oppositely disposed sloping surfaces between the ribs, which merge into the surfaces of the ribs, all of the surfaces from beginning to end of each portion varying in angularity to any radial line, substantially as described.

7. A concrete reenforcing bar of substantially uniform cross section and tensile strength, composed of a plurality o selfcompensating portions of elliptical cross section varying in diameter from end to end, the greater diameter of adjacent porvtions being at right angles to each other,

each end of each portion overlapping the end of the adjacent portion, while the surface of one portion merges into the surface of the adjacent portion.

In testimony whereof we have hereunto set our hands.

CARL G. OHLSON. ALFRED E. J UPP.