US1718883A - Building tbuss - Google Patents

Description

A; E. SHODIN BUILDING TRUSS June 25, 1929.

Filed Aug. 22, 1927 5 INVEIyTOR. 7527? ZZZ 5% oafzrz ATTORNEY" Patented June 25, 1929.

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BUILDING TRUSS.

Application filed August 22, 1927. Serial No. 214,669.

This invention relates to building roof trusses.

It is an object of mypresent invention to provide an improved, metal skeleton truss including a reinforced, concrete beam body.

Another object is to provide a roof system combining a double component springer arch and a straight tension chord, and in this connection an object is to provide arch and chord members of stock angleiron or L-bar whereby to obtain simplicity, strength and low cost of material, and effect a fireproof structure.

Other objects, advantages and features of construction, combination and arrangementand details of elements will be made manifest in the following specification of the herewith illustrated embodiment; it being un derstood that modifications, variations and adaptations may be resorted to within the spirit, scope and principle of the invention as it is more directly claimed hereinafter.

Flgure 1 is an elevation of one portion of the truss.

Figure 2 is a plan of an end of the truss.

line 3-3 of Figure 7 is an elevation of amountedtruss showing the Walls carried above the ends of the truss.

The present truss consists of an upper springer or arch including evenly spaced con centric or parallel stock angle-iron bars in pairs, and a base chord formed of a pair of angle-iron bars whose ends merge into the ends of the springer or arch.

Sufficient of the truss is here shown to indicate the fabrication of the whole. While the top of the truss is represented as springing in straight lines it is to be understood that the same construction may be in arch or curved form.

The chord consists of a pair of a set of straight angle-bars 2-3 with upturned Webs 4 spaced to receive and being riveted on upper diagonal braces 5 and tandem end plates 6-7; one end only of the truss being here shown. The diagonal brace bars 5 are of simple fiat bar stock and are disposed from end to end of the truss.

The upper ends of the bars 5 and the top margins of the plates 6 are embraced by and riveted to down-turned Webs 8-8 of longitudinal, inner arch springer bars 9-9 of angle-iron whose ends reach down to and are riveted at 8 to the end plate 6. The extremitiesof the L-bars 9 are out-set as shown in Fig. 4 in detail to lap the webs 4: of the inner chord bars and are riveted at 11 thereon. The Webs 8 are cut away at 12 so that the flange of the bar 9 can be bent back at a desired angle to form a toe reaching upward and cut and bent at an angle to provide a horn 14.

Where the bars 9 are out-set from the chord members, fillers or spacers 15 are introduced next to the plates 6 and receive rivets 16.

Suitably spaced out from the, inner, springer arch members 9-9 is an outer or upper component including down-turned L- bars 20-20 whose webs 21 are spaced by and riveted on the top margin of the end plate 13. The out'turned flanges to the top bars 20 rest on and are riveted to the horns 14 of the plates 18 of the inner arch bars 9-9.

"It will be seen that the chord 44 is riveted to the bottom of the plate 7 at 21 and that the upper arch parts 20-20 are riveted at 22. The Webs of the plates 13 are riveted at 23 to the plate 7 At suitable pitch along the arch springer a series of lattice bars 24: is riveted between the webs of the upper and lower arch components 9 and 20.

' The flanges of the upper and lower bars 9 and 20 are connected by pairs of heavy bolts 25.

The above sets forth the detail construction ofa fabricatedtruss having a straight bottomchord of angle bars 2-3 and a top structure ofv upper and lower springer or arch components 9-9 and 20-20. The webs 21 and 8 are down-turned, and the chord webs are upturned.

The ends of the truss are adapted to set on any desired Wall body WV.

hen so set longitudinal roof joists J are hung from truss to truss and mounted, as shown in Fig. 6, between the out-turned flanges of the upper and the lower bars 9 and 20. The near ends j of the joists are 'well spaced and preferably diverged from to form chambers which are filled with concrete C; the lower ends of the fill resting on cross plates 30 secured to the rests or plates 13.

Reinforcing rods 31 are planted, in the molds, to be embedded in the cast concrete beam.

I have, therefore, provided a truss wherein the roof joists are hung with their top and bottom edges wholly between the upper and lower flanges or inner and outer arch lines I of the arch component.

This is an important feature for it enables a material reduction on the cost of solid wall body which has to be carried up a distance, fixed by fire regulations, above the top line .of the end of the truss on the carrying wall.

By placing the depth of the joists between the arch lines, or within the depth of the top component I save fire wall height equal to the depth of the joists. If the joists laid above the top line of the arch additional fire wall equal to the depth of the joists would be required. Fig. 7 is a diagram showing the inner pair of arch angle-bars being out-set to V overlap and being riveted to. the webs of the chordangle-bars and having upturned plate ends securedtov the websof the outerarch angle-bars. V v

2. A building truss including a pair of angle-bars forming a chord and having spaced, upturned Webs, an arch component including a top pair of angle-barswith spaced, down-turned webs and an inner pair of angle-bars with spaced, down-turned webs, diagonal braces embraced by and riveted to the webs of the chord pair and to the inner arch pair, lattice bars embraced by and riveted to the webs of the inner and outer arch pairs, a tie'plate embraced by and riveted to the chord pair and-to the inner arch pair, and an end tie plate embraced by and riveted to the ends of the said several pairs, the

flanges of the arch pairs being out turned and pairs of bolts connecting the pairs of vertically spaced flanges.

3. In a roof truss, an arch component including vertically spaced inner and outer pairs of angle-bars, a pair of chord anglebars, an end tie plate to which all of the pairs converge and are riveted, and an inner plate riveted to the inner arch pair and to the chord pair; said inner arch pair having the terminals of its bars upwardly bent to form plates which are secured to the outer arch pair.

4. A composite roof truss including a chord component, an arch component having verti cally spaced members secured to the chord, a concrete beam cast within thespaced members, a cross plate between the arch members and near their ends and forming a footing for the concrete beam.

5. A roof truss construction including a chordcomponent, an arch component having spaced pairs of structural members connected to the chord, roof joists having spaced ends hung on the inner of said members, and a concrete fill extending along the truss components and between the spaced ends of the joists.

6. A composite roof truss including a chord component, an arch component having vertically spaced top and bottom 1nembers,sccuring-means between the chord and said members and including upstanding bolts connecting said spaced members, a concrete archbeam cast within the spaced members and embedding said bolts, a cross plate between the arch members at their remote ends and forming the end footing of the arch-beam.

ALBIN E. SHODIN.

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