US1741331A

US1741331A - Truss

Info

Publication number: US1741331A
Application number: US306133A
Authority: US
Inventors: Norman B Obbard
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-09-15
Filing date: 1928-09-15
Publication date: 1929-12-31
Anticipated expiration: 1946-12-31

Description

Dec. 31, 1929. l OBBARD- 1,741,331

TRUSS Filed Sept. 15 4928 n I 6 6 1720620302: A oE/ w/v 5. 055,420

a k UNITED STA 2 line Iv-Iv of-Figure 2.

Patented me. 31, 1929 TES' Ill'ORJllLAlil' B. OBBARD, OF PITTSBURGH, PENNSYLVANIA- muss Application filed September 15, 1928. Serial No. 366,133.

This invention r lates to trusses and, while not limited thereto, relates more particularly to light trusses suitable for use as floor joists, rafters, purlins, poles and the like, and has 5 for one of its objects the provision of a truss of this class having improved mechanical properties over trusses of this general class.

Another object is to provide a truss which Y can be readily assembled from rolled material.

Another object is to provide a truss structure which is very suitable for resistance welding.

A further object is to provide a novel form 1 of lacing bar which will support the chord members of the truss from sidewise twisting.

In the drawings: Figure 1 is a side elevation of a truss constructed in accordance with this invention. Figure 2 is an enlarged fragmentary side elevation of one end of the truss of Figure .1. Figure 3 is a sectional view taken on the line IIIIII of Figure 2.

Fgure 4 is a sectional view taken on the Figure 5 is a sectional view taken on the line V -V of Figure 2.

Referring more particularly to the rawings, the

numerals

2 and 3 designate the upper and lower chord members, respectively, of the truss, which are generally V-shaped in cross-section and have their flanges bent outwardly adjacent their edges into a substantially horizontal plane, as at 4. The upper 5 and

lower chord members

2 and 3 are arranged with their apexes opposite or point ing toward each other and are joined by a continuous lacing bar 5 of substantially 0 cruciform cross-section, and bent alternately up and down between said

chords

2 and 3. The lacing bar 5 is so arranged that the apeXes of the

chord members

2 and 3 extend into the space between two of the arms 6 of the bar 5 and the sides of the arms 6 contact with the side faces of the flanges of the chord members. The bar 5 is secured to the

chord members

2 and 3 at the points of contact between the arms 6 and the flanges of the chord members, preferably by resistance welding,

as at- 7, although any other means of securng the parts together maybe used.

The ends of the truss are provided with diagonally arranged end supporting members 8 of substantially the same cross-section as the chord members. The members 8 are arranged with their apexes extending upw wardly or in the same directionas the apexes of the lower chords and have short lengths adjacent their ends bent so as to lie in a horizontal plane parallel'with the longitudinal axis 'of said chord members, as at 9 and 10 respectively.

methods of welding. v

Trusses like that above described have materially greater mechanical properties than the general form of trusses of this class, due to the novel cross-section of the chords and lacing member.

It will be especially noted that the cruciform section used for lacing the truss has better mechanical properties than the round or square bars or rods generally used for this purpose and, due to its novel shape, it is adapted to fit over the apexe's of the chords so as to'provide a larger area of contact than can be obtained in any'other shape of bar or rod; this contact ma es an ideal condition for resistance welding;

Another advantage resulting from the use of the cruciform lacing rod is that this form of rod, when mounted as in the above described structure, serves to support-the chord members against sidewise twisting strains.

While I have shown and described one specific form of my invention, it will be understood that I do'not wish to be limited thereto since various modifications may be made without departing from the scope of my invention, as defined in the appended claims. I claim-- 1. A metal truss composed of upper and lower chord members of generally V-shaped cross-section, said chord members being arranged with their apexes opposite each other, and a continuous lacing bar of substantially cruciform cross-section bent alternately up and down between and engaging said chords, said lacing bar being so arranged that the apexes of the chord members extend into the space between two of the arms of said lacing bar and the sides of the arms of the lacing bar contact with the side faces of the chords,

said chords and said lacing bar being welded along their lines of contact.

2. A metal truss composed of upper and lower chord members of generally V-shapedv cross-section, said chord members being arranged with "their apexes opposite each other 3. A metal truss composed of upper and said top chord member and connected thereto by a short length of bar of cruciform crosssection and means for securing said chords and end members together.

4. A metal truss composed of upper andlower chord members of generally V-shaped cross-section, said chord members being arranged with their apexes opposite each other, and a continuous lacing bar having its top and bottom faces grooved, said bar being bent alternately up and down between and engaging said chords, said chord members having their apexes extending into the grooves in said lacing bar, and said chords and said lacing bar being welded along their lines of contact.

In testimony whereof, have hereunto signed my name.

NORMAN B. OBBARD.

lower chord members of generally V-shaped cross-section, said chord members being arranged with their apexes opposite each other and having the outer portion of their flanges bent outwardly in a substantially horizontal plane, a continuous lacing bar of substantialy cruciform cross-section bent alternately up and down between and engaging said chords, said lacing bar being so arranged that the apexes of the chord members extend into the space between two of the arms of the lacing'bar and the sides of the arms of the lacin bar contact with the side faces of the chor s, said chords and said lacing bar being welded along their lines of contact, and end members extending diagonally between said chord members, said end members being of generally V-shaped cross-section and having the outer portion of their flanges bent outwardly, said end members being arranged with their apexes extending in the same direction as the apex of the lower chord and having short lengths thereof adjacent each end bent into a horizontal plane parallel with the longitudinal axis of said chord members, the horizontal length of the lower ends of said end members being fitted over said lower vchord member and the horizontal length of the upper ends of said end members having its apex opposite the apex of