US1013649A

US1013649A - Solid rolled metal i-beam of nine inches and under twelve inches in height.

Info

Publication number: US1013649A
Application number: US17310803A
Authority: US
Inventors: Henry Grey
Original assignee: AMERICAN UNIVERSAL MILL Co
Current assignee: AMERICAN UNIVERSAL MILL Co
Priority date: 1903-09-14
Filing date: 1903-09-14
Publication date: 1912-01-02
Anticipated expiration: 1929-01-02

Description

H. GREY.

SOLID ROLLED I-BBAM 0F NINE INCHES AND UNDERTWEINE INCHES IN HEIGHT.

APPLICATION FILED SEPT. 14, 1903.v

1,01 3,649. Patented Jan. 2, 1912.

, Y I 25" W" WITNESSES:

ATTORNEYS UNITED STATEN PATENT @FFIQE.

HENRY GREY, OF NEW YORK, N.

IANY, OF NEW YORK,

Y., ASSIGNOR T0 AMERICAN UNIVERSAL MILL COM- N. Y., A CORPORATION OF WEST VIRGINIA.

SOLID ROLLED METAL I-BEAM OF NINE INGHES AND UNDER TWELVE INCHES IN HEIGHT.

Specification of Letters Patent.

Patented Jan. 2,1912.

Application filed September 14, 1903. Serial No. 173,108.

To all whom it may concern:

Be it known that I, HENRY GREY, a citizen of the United States of America, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Solid Rolled Metal I-Beams of Nine Inches and Under Twelve Inches in Height; and I 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 make and use the same.

This invention relates to improvements in solid rolled I-beams measuring over eight inches and under twelve inches in height.

The general object of this invention is to produce improved solid rolled steel or iron I-beams not less than nine inches in height and less than twelve inches, and capable of j safely carrying on any span whose length in feet is equal or exceeds the height of the beam in inches, for a given unit of material, a greater load than has heretofore been carried. In other words, this invention has in view the production of a solid rolled metal I-beam having a height within the 'range hereinbefore indicated, which shall, by reason of an advantageous distribution of material in its web and flanges, be able tosafely carry, on all spans included within the above-mentioned limitation, a larger load to the unit of weight in the said beam than has heretofore'been carried by any heretofore produced solid rolled I-beam of the same height.

The object of this invention, more specifically stated, is to produce solid rolled I beams not less than nine inches and under twelve inches in height, which are capable of safely carrying, on all spans of one or about one foot for ever inch in height of the beam, anevenly dlstributed safe load equal .in amount to that carried by any heretofore made solid rolled Ij-beams of the same height, with ten per cent. less weight of material.

" Another object is not onlythe production in a solid rolled K-be'am. having a height within the range hereinbefore indicated, which shall, "by reason of an advantageous distribution of material in its web, and

(I flanges, be abletosafely carry, on all spans included within the above-mentioned limita-' tion, a larger load to the unit of weight in the said beam than can be carried by any heretofore produced solid rolled I-beams of the same height, but which has a web of considerably less thickness than the thickness of the webs of heretofore made solid rolled I-beams of the same height and also considerably less in thickness relative to the mean thickness of the flanges than the webs of the said beams of the prior state of the art, and has -a width which, measured straight across the outer sides of adjacent opposltely projecting flanges of the beam, is over twelve times the mean thickness of the flanges of the beam.

With these objects in view, this invention consists more especially in the production of solid rolled I-beams having a height over eight inches and under twelve inches, and having such width relative to the mean thickness of the flanges, with the mean thickness of each flange and the thickness of the web bearing such proportion to each other, that the coefficient of strength in any beam having a height within the said range, per unit of weight of one pound, for a fiber stress of sixteen thousand (16,000) pounds per square inch, exceeds ten hundred and eighty pounds of height of the beam;

In the accompanying drawings, Figures 1 and 2 are cross-sectional views of solid rolled I-beams embodying my invention and having a height of ten inches and nine inches respectively. Fig. 3 is across-sectional view of a rough beam or blank suitable for use in the manufacture of the solid rolled nineinch beam shown in Fig. 2. Portions are broken away in Fig. 3 to reduce the size of the drawing.

Refenring to the drawings, w represents the web, and f, the flanges of the beams.

K designates the solid rolled I-beam illustrated in Fig. 1. The beam K has a height of ten inches, as already indicated,-that is,

measures ten inches (10") between the outer sides of the flanges formed at one and the same side of the web of the-beam. The

beam K has a width of five and one-half inches (5.5),that is, measures five and one-half inches (5.5) between the longitudinal edges of adjacent oppositely projecting flanges f of the beam. The thickness of (1080 lbs.) for every inch dredths of an inch (15.82) between the outer sides of the flanges at one end and the same side of the web of the blank. The blank Z has a width of five and one=half inches (5.5" ),that is, measures five and one-half inches (5.5") straight across the outer sides of adjacent oppositely project" ing flanges of the blank. The mean thickness of each flange of the blank I is three inches and eight-tenths of an inch (3.8),

and the thickness of the web of the blank is one inch and nine-tenths of an inch (1.9"), and hence the mean thickness of the said flange is twice the thickness of the web of the blank. It will be observed, therefore, that the mean thickness of each flange of the blank Zbears, to the thickness of the web of the blank, the same or approximately the same ratio which the mean thickness of the Said flange, when formed and as it is to exist in the beam L, Fig. 2, to which the said blank is to be reduced, bears to the thickness of the web of the said beam.

I would remark that my invention, which constitutes the subject-matter of this application, is the result of an exhaustive study of the ways and means best adapted to most economically and advantageously distrib ute the material used'in the manufacture of the solid rolled I-beams of a height of eight and under twelve inches, and that my improved beams have no more material in their. webs than actually needed, but obviously considerably less material than solid rolled beams of the same height heretofore made. Solid rolled I-beams made prior to my invention have too much material in close proximity to the neutral axis.

The moment of inertia of an I-beam, when the latter is to be used as a .joist or girder, is calculated by the well known formula, viz.

1%, of [hi -i20 4 72., for the distance between the flanges at one and the same side of the web at the longitudinal edges of the said flanges; Z, for

the distance between the roots of the flanges at one and the same side of the web;

. a and t stands for the thickness of the web.

formula shows the coefficient equal to 8 X fiber strain X I span in inches X n and n standsfor the distance of center gravity of section, from top to bottom, in inches, and twelve inches (12) is used for the span; thus the coefiicient obtained is for one foot and this, in general parlance, is called the coeflicient. If the safe load, uniformly distributed, is required for any definite span, the coeiiicient'is divided by the number of feet in that span, and the quotient obtained is the safe load for that given span.

I would remark also, that to make a solid rolled I-beam' having a height of eight inches, nine inches or ten inches, which shall be equally strong to resist bending under a load and avoid buckling of the web, for a certain length of span hereinbefore mentioned, is' the object I aim at in producingmy improved I-beams hereinbefore described; that a consideration of .the possibility to commercially produce any given I- beam, and my study of what is most desirable in solid rolled I-beams having a height of eight and under twelve inches, have resulted inmy inventing such a proportion, in the said beams, between the thickness of the Web and the mean thickness of the flanges, and between the mean thickness of the flanges and the width of the flanges, as to enable me to produce solid rolled I-beams having a height not less than nine inches, which, when'used as girders or joists, are, with ten per cent. less material inthem, equal in load-carrying capacity to the solid rolled I-beams of the same height in the priorstate of the art.

What I claim is 1. As a newarticle of manufacture, a solid rolled I-beam not less than n'ine'inches in height, the width of the flanges of which is not less than twenty-two times greater than the thickness of the web thereof.

'2. As a new article of manufacture, a

' solid rolled I-beam the width of the flanges ofwhich is substantially five and one-half inches and the mean thickness of which flanges is substantially one-twelfth of their width. f

3. As a new article of manufacture, a solid rolled I-beam the height of fWhiCll is over nine inches but under twelve inches, the ratio of the width of the flanges to the thickness of the web being not under twentytwo.

4. As a new article of manufacture, a solid rolled I-beam, the height of which is not less than nine inches, and the width of the flanges of which is substantially 5.5 inches, and the thickness of the web of which is .2 of an inch.

5. As a new article of manufacture, a solid rolled steel I-beam, the height of which is not less than nine inches, the Width of the flanges of which is substantially 5.5 inches, the thickness of the web of which is substantially .2 of an inch, and mean thickness IIBSSBS.

of the flanges of which is substantially .437 10 HENRY GREY. Witnesses:

C. H. Donna,

G. M. HAYEs'.