US1613788A - Trussed structure - Google Patents

Description

v y 1,613,788 Jan. 11 9 G, H; DAWSON ET AL Original Filed Nov. 26, 9

-' hundred.

Patented Jan. 11, 1927.

UNITED STATES GEORGE HIVES nAwsoiv, or BOSTON, MASSACHUSETTS, AND HURXTI-IAL FIELD EREASE, or CANTON, OHIO.

' TRUSSED STRUCTURE.

Original application filed November 26, 1924, Serial No. 676,897. Divided and this application filed December 11, 1924.

The invention relates to trussed structures having spaced chord members and connecting web members joined together; and this application is a division of our prior appli cation for patent for trussed structures, filed November 26, 1924, Serial No. 676,897.

Ordinarily the chord and web members of a trussed structure are separate pieces which must be made to size and assembled to form the completed structure. In the manufacture of even a simple trussed girder of sub- Stantial length, while the equivalent of a large number of chord members is attained by the use of two or more strips of the total length of the girder, yet there are still a large number of separate web members each of which must be made and punched to size and each of which must be properly assembled and fastened usually by means of rivets to the continuous equivalents of a large number of chord members. In the manufacture of Such a girder the number of Separate members each of which must be made to size and assembled often runs to several Due to the fact that most of these members must be fastened at each end to the co-operating members in the structure or the equivalents thereof, the number of chances for manufacturing and assembling errors, for two ended members, is double the number of members or equivalents to be assembled. Moreover in such an assembled trussed Structure unequal strains and stresses are often set up in individual members due to the fact that it has been found to be a practical impossibility accurately to Space and secure the fastening means which tie the truss members together at the joints.

The objects of the present invention are to economize the manufacture of trussed structures and to overcome unequal strains and Stresses due to erection inaccuracies, by reducing the number of parts to be made and assembled; and these objects are attained by the use of Aplurality of trussed elements each formed from a continuous strip and including spaced rows of chord members and connecting web members, there being junction angles between the chord and web members and means fastening the chord and web members of one element to each other at the junction angles and to the chord members of another element.

Serial No. 755,193. 7

Several forms of the invention are illustrated in the accompanying drawings forming part hereof, in which Figure 1 is an isometric View of a polygonal trussed structure including a plurality of trussed elements;

Fig. 2, a fragmentary elevation of a trussed structure made up of two trussed elements;

Fig. 3, a top plan view of the same;

Fig. 4, across-Section of the same, as at IV IV, Figs. 2 and 3;

Fig. 5, an isometric view of a trussed panel Structure including a plurality of trussed elements and suitable cross reinforcing Strips.

IVhile the continuous material used to form any of the various types of trussed Structures of the present invention may be of any desired substance; for most practical purposes a continuous metallic material adapts itself easily to the necessary forming operations, and to assembly by the use of any desired fastening means such as riveting, welding, or mechanical means.

Moreover, the material need not be solid as shown, but may be perforated material, expanded material, or material of any other desired conformation.

Similar numerals refer to similar parts throughout the drawings.

In Figure 1, a trussed structure 23 is Shown which includes three trussed elements 20 assembled to form a closed triangular structure having three flange members 28 Each trussed element is made from a continuous Strip and includes chord members 21 web members 22 and junction angles 24 between the chord and web members.

The flanges 28 consist of abutted and joined rows of chord members of successive trussed elements. Preferably the junction angles of one element lie midway between the junction angles of the next abutting ele ment, and alongside the chord members thereof, thus adapting the formation to fastening by the use of the welds 27 which unite the abutting junction angles and chord members.

Figs. 2, 3 M1614, illustrate a trussed Structure 23 'made up of two Similar trussed elements 20 having chord members 21 web members 22 and junction angles 24 between the chord and web members, each element being made from a continuous square Wire or rod.

The structure 23 is preferably assembled as shown so that one element is directly placed upon the other in such a way that the chord members of both elements abut each other and the angles 2& of one element lie midway between the angles of the other element. By this method of assembling, welded fastenings 27 may be used not only for joining the junction angles to each other in the same element, but also to the chord members of the other element. Thus a very strong and easily assembled trussed structure may be made from but two separate parts.

In the structure 23 shown in Fig. 4, a plurality of elements 20" have been assembled to form a panel trussed structure which may be used as a floor or roof supporting or reinforcing panel. Here again each of the elements 20 includes a continuous strip of material shaped to form chord members 21", web members 22 and junction angles 24? between the chord and web members. The plurality of elements are assembled so that the chord members and angles of one element abut and are joined to, the chord members and angles of the next element to form alternately disposed rows of chord flanges 28 The planes of the joined elements are alternately disposed at angles with each other so that a saw-tooth profile is attained as illustrated, wherein every alternate flange 28 may be considered to be a peak of the saw-tooth profile. The rigid structure 23 is completed by the use of, cross-members 34 which may be fastened by any known means not shown to the abutting elements.

lVe claim:

1. A trussed structure including a plurality of trussed elements each formed from a continuous strip and including spaced rows of chord members and connecting web members, there being junction angles between the chord and web members and means fastening the chord and web members of one element to each other at the junction angles and to the chord members of another element.

2. A trussed structure including a piu rality of trussed elements each formed from a continuous strip and including spaced rows of chord members and connecting web members, there being junction angles between the chord and web members and means fastening the chord and web members of one element to each other at the junction angles and to the chord members of another element, the junction angles of the -one element being spaced between the junction angles of the other.

3. A trussed structure including a plurality of joined trussed elements each formed from a continuous strip and including spaced rows of chord members and connecting web members, there being junction angles between the chord and web members and means fastening the chord and web members to each other at the junction angles, the elements being joined with others at the rows of chord members, and the planes of the joined elements being angularly disposed to each other, and there being cross members connecting the joined rows of chord members.

4t. A trussed structure including a plurality of trussed elements each formed from a continuous strip and including spaced rows of chord members and connecting web members, and there being junction angles between the chord and web members, the chord members of the separate elements be ing joined to each other, and connecting the junction angles of the elements together.

5. A trussed structure including a plurality of trussed elements each formed from a continuous strip and including spaced rows of chord members and connecting web members, and there being junction angles between the chord and web members, like chord members of the separate elements being joined to each other, and connecting the unction angles of the elements together.

6. A trussed structure including a trussed element formed from a continuous strip and including spaced rows of chord members and connecting web members, there being junction angles between the chord and web members, and separate chord members adjacent some of the junction angles, and means fastening the junction angles to each other and to the separate chord members.

7. A trussed structure including a trussed element formed from a continuous strip and including spaced rows of chord members and connecting web members, there being junction angles between the chord and web members, and a separate plurality of connected chord members adjacent the junction angles, and means fastening the junction angles of the element to each other and to the separate connected chord members.

In testimony that we claim the above, we have hereunto subscribed our names.

GEORGE HIVES DAWSON. HURXTHAL FIELD FREASE.

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