US1597384A

US1597384A - Steel joist

Info

Publication number: US1597384A
Application number: US63903A
Authority: US
Inventors: Fredellia H Moyer
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-10-21
Filing date: 1925-10-21
Publication date: 1926-08-24
Anticipated expiration: 1943-08-24

Description

F. H. MOYERl STEEL JOI ST Aug. 24, 1926.

Filed Oct. 21, 1925 2 Sheets-Sheet 1 gwwntoc H Moyer' E@ WM Summa;

F. H. MYER STEEL JoIsT Aug. 24 1926. 1,597,384

Filed oct. 21. 1925 2 sheets-sheet z F H Moyer' 511 ma JVM Pmn'ed Augy24, 1926. 'l

,UNITED STA Tas 4PAT

ENT OFFICE.'

'manzana n. Moran, or CANTON, omo..

STEEL Jorsr.

Application led Qetoler 21, 1925. l Serial No. 63,903.

Theinvention relates to a structural member made of steel or other metal for use 1n 'buildings in lieu 'of timber cut to shapesv` commonly known as lumber, the smaller sizes of the metal member being adapted for vuse as rafters and joists, and the larger l sizes being adapted for use as beams and girders in building construction, either in connection with wooden flooring, roofin and lathing, or with expanded metal an reinforced concrete floor and ceiling construction in common use.

One object of the improvement is to-provide a. trussed member made out of ordinary standard steel bars in commony use and more particularly to assemble and secure together bars of such shape as will glve the greatest strength between ythe joints of the different elements of the structure, and alsoin the drawings- Figure 1 is a side 'elevation of the improved ]'oist;

Fig. 2, an enlarged slde elevation of one end thereof;

Fig. 3, an enlarged side elevation, broken away in the middle, of the improved ]o1st.;

Fig. 4, an enlarged section of. same on line 4-4, Fig. 3;

Fig. 5, an enlarged section of same on line 5-5, Fig. 3; e

Fig. 6, a side elevation of one terminal L-p'late; and

Fig. 7, a fragmentary View showing detail arrangementvof a joint.

Similar numerals refer to similar parts throughout the drawings. i

The structural member may be made of upper and

lower chord bars

6 and 6a, laterally spaced apart in pairs, between which is secured a connecting bar 7 bent to form a web element for the member.

. For the purpose 4of the present improvement, square section bars are used for all of theseelements, and they are also preferably arran ed with their diagonal diameters in uprig 1t and transverse planes, so as to avail of the greatest` strengthsof the various bars 1n these directions.` For use in making a steel joist fifteen feet 1n over-all length, the upper chord bars 6 may be madeof a 93% squaresection, and the lower chord bars 6a Imay be made of a l square `section, and the web bar may be madev of a 3/8 square section.

The upper chord bars 6 preferably extend straight from end to end of the joists and the lower chord bars 6a may extend parallel with the upper bar a suitable distance, say

8 below the lupper bars to points preferably some two feet from the ends of the Y upper bars; whence the lower .bars may be bent diagonally upwards to points y which may' be 12 from the ends of the upper bars; whence the lower bars extend parallel with the upper bars some 2 below the same, so as to form a bearing for the ends of the joists well above the longitudinal axis of the joists.

The web bar 7 is bent in well known zigzag fashion to form a trussbetween'the chord bars and each diagonal portion of the bar may be located at an angleof say 30 from the vertical., For the purpose of the present invention, each upper and 'lower angle of the web bar may be made in two bends 7', located something more than an inch apart; between .which bends 'a straight portion 7 of substantial length is formed in the angle of the web bar, the flat sides of which are contiguous with the abutting flat sides of thev chord bars through a substantial area' in length and breadth, as compared with a single point or line contact between round bars.

Furthermore, the double bend at each angle not only provides a surface contact at each weld to insure the greatest strength, but the metal in the web bar in contact with the two'chordbars',l reinforces the joint to overcome` the bending moment due to the lines'of force in both tension and compres..`

sion members of the web bar meeting at a panel point outside of the center of gravity of the chord bars, as indicated in Fi 7.

-The chord bars are 'spaced a slig t distance apart, which may be equal to the thickness of two plies of 11 gauge vsheets or plates; so that the upper and lower angles of the web bar will protrude, upward and downward respectively above and belowthe inner angles of the chord bars, as shown in the drawings. This arrangement of the bars permits them to be secured together` by arc welds 8 located both on the upper and lower inner sides of the 'chord members thus giving at each vjoint a substantial length of said welds for each angle of the truss rod.

It will be understood, however, that instead of using arc welds asillustrated, the` joints of the bars can be secured together by an actual welding of the contiguous surface .by the use of heat and pressure in well known manner; in which event lthe square section bars, the arrangement of the diagonal diameters in upright and transverse planes, and the longitudinal elongation of each angle of the web bar, gives a welding area of substantial length and width for the abutl steel and may be slit upward at z from the lower edge, so that one end ofeach plate may be bent outward to form an L-ange 9 and 9*', upon which the terminal end portions 7a of the truss bars may rest, and these flanges also form a bearing surface of substantial length and width for the end of the joists upon a supporting wall.

The stem of the'T-member formed bythe plates extends upward between the lower and upper chord bars, which may be secured thereto by are welds 8 as well shown in Fig. 5 of the drawings, and the inner ends of the plates are notched at 9 and beveled at 9 to conform to the lower edge of the terminal portion 7 of the web bar, and these 4edges ofthe plates and bar may be secured together by arc welds 8; thus rigidly securing all of the terminal and bearing parts of the joist together by means Aof the T- member. y

An extension strip or bar 10 may be secured to the under side of the chord bars at the angle thereof, whence the strips 10` may extend horizontally outward to a point below the angle y of the lower chord bars, so as .to form a continuation of the lower chord bars and furnishing a support for expanded metal or other. kinds of lathing which may be secured thereto.

I claim 1. A structural member including laterally spaced pairs of upper' and lower bars and an intervening zig-zag web bar. secured at its angles as by welding between the chord bars, all the bars being of rectangular section having` flat sides arranged with their diagonal diameters in upright and transverse planes and with portions of their flat sides in abutment with-each other.

2. A structural member' including laterally lspaced pairs ofnpper and lower bars and an intervening zig-zagweb bar secured at its angles as by welding between the chord bars, all the bars being` of rectangular section arranged with their diagonal diameters in upright and transverse planes, and each angle of the web bar being made with two bends forming an elongated portion contacting with the chord bars. y

3. A structural member including laterally ,spaced pairs of upper and lower bars and an intervening zig-zag web bar secured at its angles as by welding between'the chord "bars, all the bars being of rectangular section arranged with their diagonal diameters in upright and transverse planes, the. lower chord bars being inclined upward toward the upper chord bars and thence extended parallel therewith above the longitudinal axis of the member, and an upright plate secured as by welding between the end portions of the chord bars. v

4. A structural member including laterally spacedpairs of upper and lower bars and an intervening zig-zag web bar secured at its angles as by welding betweenthe chord bars, all the bars being` of rectangular section arranged with their diagonal diameters in upright and :transverse planes, the lower chord bars being'inclined `-upward toward the upper chord bars .and thence extended parallel therewith above the4 longitudinal axis of the member, and an upright plate secured as by welding between the end portions of the chord bars andhaving L-langes extending under the end portions of the lower chord bars.

5. A structural member including laterally spaced upper and lower bars and an intervening zig-zag web bar secured at its angles as by welding between the chord bars,

all the bars being of rectangular section arranged with their diagonal diameters in upright and transverse planes. the lower chord bars being inclined upward toward the upportions of the lower chord bars.

6. A structural member including laterlao ally spaced pairs of upper and lower bars upright plate secured as by welding between and an intervening zi -zag'web bar secured the end portions of the chord bars, and havat its anglesas by wel ing between the chord ing its inner end edge abutted and secured as 10 bars, the lower chord bars being inclined by welding to the end portion of the web bar.

l upward toward the upper chord bars and In testimony thatI claim the above, Iv have thence extended parallel therewith above hereunto subscribed my name. the longitudinal axis of the inember, and an FREDELLIA H. MOYER.