US1417929A - Truss - Google Patents

Description

.l. C. McKEOWN.

muss.

APPLICATION FILED SEPT. 20. I919.

Patented May 30, 1922.

UNITED STATES JOHN G. MOKEOWN, OF CHICAGO, ILLINOIS.

TRUSS.

Specification of Letters Patent.

Patented May 30,1922.

Application filed September 20, 1919. Serial No. 325,243.

To all who 1n it may concern:

Be it known that I, Jonn C. Mcllnown, a citizen of the United States, and resident of Chicago, in the county of Cool: and State of Illinois, have invented a new and useful Truss, of which the following is a specification.

This invention relates to trusses and relates particularly to trisses comprising a continuous, bowed upper chord and a lower chord, both built up from timbers forming different layers, said chords being connected by suitable bracing.

The object of the invention is to provide a truss of this type which will. combine the features of adequate strength, simplicity of construction and economy of manufacture. To this end, my improved truss comprises the various A features, combination of features and details of construction hereinafter described and claimed.

In the accompanying drawings, in which my invention is fully illustrated,

Figure 1 is a side view of a truss embodyine' mv invention;

Figure 2 is an enlarged sectional vie w thereof on the line 2-2 of Fig. 1; and

Figure 2-3 is an enlarged. sectional view thereof on the line 3-3 of Fig. 2.

Referring now to the drawings, 1 designates the bowed top chord of the truss and 2 the bottom chord thereof, both of which are built up from continuous layers of plank or other timbers rigidly connected together to form unitary structrnfes.

As regards my present invention, the specific construction of the top and bottom chords of my improved truss is not material and both of said chords may be of any desired or approved construction. Desirable forms of chords are those shown and fully described in my co-pending application for improvements in trusses, filed in the Patent ()tlice on or about September 15, 1919, Serial No. 323,831, to which reference is made for a detailed description thereof.

The ends of the top chord 1 are rigidly connected to the bottom chord 2, preferably by means of stj'aps 3 secured to said bottom chord, and extend around the ends of said top chord 1, said top chord being provided with shoulders at its ends which abut against the intermediate sections of said straps 8.

Said chords 1 and 2 are rigidly connected at intervals throughout their length by means of tie rods land are held in desired spaced relation by means of struts or stanchions 5 inserted between the adjacent sides of said chords, the tie rods 4 preferably extending through holes formed lengthwise through said struts or stanchions.

-For simplicity and cheapness of manufacture, the struts or stanchions 5 preferably consist of two longitudinal sections designated 5 and 5, the holes through said stanchions which receive the tierods 4- being formed by grooves 6 formed in the face of the thicker stanchion member 5 which contacts with the strut or stanchion member 5 the difference in the thickness of said members 5 and 5 being substantially equal to the depth of the grooves 6, whereby said grooves will be formed entirely in the thicker sections of said struts or stanchions.

After the stanchion sections 5 5 have been assembled between the chords 1 and 2 with the tie rods 4 extending through the holes formed therein by the grooves 6, the sections of said struts or stanchions are rigidly connected by bolts or other suitable means inserted therethrough at desired intervals. and the ends of said struts or stanchions are confined in recesses 7 formed transversely in the adjacent sides of the top and bottom chords 1 and 2.

The heads of the rods 4: and the nuts threaded therethrough preferably bear against washers or plates 8 inserted over said rods and adapted to bear directly against the outer sides of the top and bottom chords, said. plates or washers 8 on the upper chord at opposite sides of the center being thickened at their outer edges to provide a. flat bearing for the heads of said tie rods, 01' the nuts threaded thereto, as the -ase may be.

A particular advantage of the truss of the present application is that the tension rods 4, being encased within the struts or stanchions 5. will be protected thereby in case of fire and thus will not be heated to a degree which will weaken them-at least not in the initial stages of the fire.

A further advantage of my improved truss is that, owing to the relatively large unobstructed spaces'between the struts or stanchions 5, trusses of this particular type admit of ornamentation by means of grilles or scroll work inserted in the open spaces of said trusses, which renders them particularly desirable for church Work and the like Where ornamental effects are desired.

I claim 1. In a truss, the combination of a bowed top chord and a bottom chord, means for rigidly connecting the ends of the top chord to the bottomchord, and bracing forsaid truss comprising only tie rods which connect said top and bottom chords, stanchions inserted between said top and bottom chords, said stanchions being provided With holes formed lengthwise through the same through Which said tie rods extend, sald stanchions comprising a plurality of connected longitudinal sections and the holes therein being formed by grooves formed in 'the'connected sides of said sections, substantially as described.

2. In a truss, the combination of a bowed top chord and a bottom chord, means for rigidly connecting the ends of the topchord to the bottom chord, and bracing for said truss comprising only tie rods Which conneet said top and bottom chords, stanchions inserted between said top and bottom chords, said stanchions being provided with "holes formed lengthwise through the same the thinner sections of saidstanchions, re-

spectively, substantially as described.

In testimony that I claim the foregoing as my invention, I aflix'my signature this 15thday of September, 1919.

JOHN C. MoKEOWN.

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