US756471A - Construction of joists, girders, or the like. - Google Patents

Description

BATENTED APR. 5, 190

J. D. CAREY. CONSTRUCTION OF JOIST$, GIRDERS, OR THE LIKE.

APPLIOATION FILED NOV. 11, 1903.

NO MODEL.

(5 923 1) MML% all Patented. April 5, 1904.

IJNHTED STATES PATENT OFFICE.

JAMES 1'). CAREY, OF CLEVELAND, OHI().

CUNSTRUCTION OF JOISTS, GIFIDERS, OR THE LIKE.

SPIIFICIFLL CATION forming part of Letters Patent No. 756,471, dated April 5, 1904.

Applieationliled November 11, 1908. Serial No. 180,721. (No model.) I

To In whom (I! um/y concern:

Be it known that l, J AMES 1). ()AanY, a citizen oi' the -Un ited States,resid ing at llevoland, in the county of 'lluyrtrl'ioga and State of Ohio, have invented oer tain new and useful Improve- "monts in Construction of Joists, (lirdors, or

the Like; and i do hereby declare the following, to be a. full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to uiakeand use tho same.

This ini rntion relates to building construc tion wherein hr-tou or cement form the baseot' the structure, the same being intrrwm on with moialiic struts, braces, tie-rods, or strengtheningelementsarrangml in prmletermined order.

The objects of the in rention are to attain the host rosuits by the peculiar formatnm of what are called the suspeusiona'mls and in conne-"tion with this a peculiar arrangtuucnt oi stirrup-piocosort-ie-pieccs arranged vertically andcxteiuling from the chords into the body of the cement and injuxta msition to the bracerods.

Still another object of this invention to vlapt the structure to the use of the same in cormcrtion with supporting-pillars, whereby both the chords and the suspension-rods are caused to embrace the upper end of the pillars, bringing the strain upon the samein opposite diro -tious.

Other objects of this invention will appeal" and be apparent in the drmvings and spccilication.

This invention consists in the peculiar arrangement and structural features as a whole and which will be hereinafter fully set forth and claimed.

- in the drawings, Figurel illustrates a joist or girder const ructed ot' boton and illustrating the arrangement of suspension and chord rod and stirrup-pieces. Fig. 2 illustrates in side elevation the joist or-girdcrconstructnm' employed in connection with a supportirig-pillar, illustnuing he upper cndo't' said pillar extending through the joist or girder to rereire the lower end of a pillar to he supported above it. This liguro illustrates in modified construction a tie or lateral supporting element composed ofspirally -arraugod heavy wires and also illustrates the manner in which the suspension-rods and chords embrace the upper end of the pillar. Fig. 3 is a plan view of a portion of Fi 2, more clearly showing the manner in which the suspension-rods and chords surround the upper end of the pillar. Figs. 4 and 5 represent in section, longitudinal and cross, the manner of securing the stirruppieees to the chord-rods.

The manner of forming the girders 0r joists is the usual process employed in heton structures, and it is with the arrangement of the metallic element and their structural feature. that this invention refers. These are composed of susponsi m-rods A, which extend from wall to wall, pier to pier, or pillar to pillar, the same in cases where pillars are not used extending a short distance beyond the supporting parts and into the next structure, as is usual. However, in structures of this type heretofore made these suspension-rods have been so arranged and bent as that they run for a considerable distance parallel to or with the chord-rods B, and hence they were abruptly bent, forming sharp turns which strain the metal at those turning-points, decreasing its tensile value and also its value in resisting flexion, and this defect was located just at the portion needing the greatest strength of resistance. I

In arranging my sus auision-rods l gradually incline them toward the point central longitudinally of the beam, and preferably in a curved diroctirm and causing them to meet the chord-rod B at the longitudinal center I: of the joist, girder, or strpcture. Usually two of the sus )ensiono'ods are employed; but more may beused, if desired or found necessary, and the cross-section of the same is predetermined according to the necessary strength desired.

Another very essential feature of my construction, as illustrated in Figs. 4 and 5, is the construction of the Stlj'l'LIp-DiUCOS and their attachment. to the stirrup-rod. l-leretol'ore these stirrup-pieces (1 have been loosely connected to the chord-rods and in some cases have been formed U-shaped, the'chord-rod lying on the bottom of the stirrup'aial not always in close contact therewith, and thus,

for instance, should the chord-rodbe bent at i What I claimis any particular portion the 1 stirrup piccesi p ture, the combination with a chord member of would not come up to it, and when the cement was packed in the structure the cement would work between the under part of the chord-rod and the seat of the stirrup, and thus the stirrup would not support the" chord-rod", and hence would detract from its value. Those familiar with strficturesof this nature will fully appreciate this obje'etion where loosely arranged stirrups are employed.

By my arrangement. as illustrated in Figs. 4 and 5 the stirrup-pieces are located'on the chord-rod and are pressed thereto and caused to positively engage the same at the lower end. Thus the disposing of the stirrups is predetermined positive and not left to or lia ble to" be disarranged by the unskilled laborer employed in filling or tamping the beton.

As illustratedin Figs.,2 anti 3 of the draw ings, instead of using stirruppieccs-a continuous rod arranged so as to brace the chordrods and the suspension-pieces may .be employed. These figures also illustrate the manner in which the structure may be employed in connection with pillars D. In this case the suspension-rods A and chords B are caused to embrace the upper end of the column or pillar D at its impost portion, thus bringing the strain in both directions'and in opposite directions, as at d (Z when the pillars are employed and allowing the pillar to pass through the structure to receive a superimposed pillar.

By disposing the metal as above described I attain great strength of structure, economy and positiveness in arrangement of the metallic element, and convenience in assembling the structure as a.whole,.as it will be seen that the elements of metal may be prearranged with their coacting parts previous to locating them and filling in the cement or beton.

In setting forth this invention l have called attention toparticular arrangements and structural features of element, but do not wish to be limited to the same as they are described or set forth.

1." In a combined cement and metallic struea suspension member bent downwardly from eaelrsupporting portion of the structure to a' pole her meeting the chord member at said point, and vertically-disposed stirrup members supporting the chord member, and means integral with the said members adapted to positively 3. in a combined cement and metallic structure, a chord member, a stirrup member supporting the same at one side thereof, and means formed integral with the stirrup member adapted to positively engage the chord mem her and retain thestirrup member in position, substantially as set forth. a

4:. In structures comprising combined cement and metal, the combination with a chord member, of a suspension member bent downwardly and meeting the chord member at a point longitudinally central thereof, a stirrup member supporting the chord member, and means formed integral with the stirrup member to retain the stirrup member in position, substantially as described. I

Signed at Cleveland, in the county of Guyahoga and State of Ohio, this 14th day of February, 1903.

JAMES D. CAREY.

. Witnesses:

-E. B. DoNNuLLY,

W. E. DONNELLY.

'ongitudinally central of the chord mem- ,chord member so as to retain said stirrup membersin position.

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