US1542919A - Roofing-truss structure - Google Patents

Description

June 23, 1925. 9 1,542,919 w. .1. SUMMERBELL ROOFING TRUSS STRUCTURE Filed May 29, 1922 Patented `lune 23, 1925.

UNITED STATES WILLIAM J. SUMMERBELL, F ALHAMBRA, CALIFRNIA.

l ROOFING-TRUSS STRUCTURE.

,' Application mea May 29, 1922. serial No. 564,402.

l To all 'whom it may cof/wem:

Be it known that I, WILLIAM J. SUMMER- BELI, a citizen of the United States, and a ,resident of Alhambra, in the -county of Los Angeles and State of California, have invented certain new and useful Improvements in Roofing-Truss Structures; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and

-to the characters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in end truss constructions for supporting ture from the principle of the present invenn tion.

Among the objects of the invention is toI `provide an end truss construction in which is embodied a' laminated top chord so arranged with respect to the bottom chord and the connection between said chords that the forces: at' the end of the truss are concentricv or in 'equil1br1um.

A further 'object` of the invention is to provide an. end truss construction wherein the laminations of the top chord take the load through end grain thrust of the chord laminations against a fixed part of the bottom chord, so as to thereby strengthenA the truss end.

Another object of the invention is to bring the roof joists or purlins lower relatively to the bottom, thus saving in surrounding brickwork of the wall enclosure.

A further object of the invention vis to .provide an improved support between the truss end and the wall, which can be anchored in the wall while the wall is being built, and to which the truss can be bolted or otherwise fastened to forma strong joint `between the truss end wall.

The invention consists in the combination and arrangementv of the elements shownin the drawings and described in the specification, and is pointed out in the appended claims.

' Asshown in the drawings:

Figure 1 is a side elevation. of a truss end embodying my invention, showing the manner of its support on the wall and showing the sheathing in section.

Figure 2 is a plan view of-the bottom chord and its top chord supporting stirrup and the bearing plate.

Figure is a section on line 3 3 of Figure 1.v

Figure 4 is a section on the line 4 4 of Figure 1.

Figure 5 is a section on the line 5--5 of Figure 1.

Figure 6 is a fragmentary perspective view showing the ends of the upper and lower chords.

As shown lin the drawings, 10 designates one of the vertical enclosing walls of a building and 11 designates as a whole a roof truss, of which there are a number arranged side by sideito support the roof structure. Each truss comprises a toplaminated chord l2 and a bottom chord 13, said chords being connected by web members 14 of any suitable type, one being herein shown. The bottom chord, as shown, comprises two or more members 15, 15 spaced to receive the lower ends of the web members 14 and to which said web members are bolted.. The bottom chord also embraces at its ends fillers 16 which extend to the ends of said bottom chord and preferably are made deeper than the side members of said bottomf'chord so as to extend at their topl edge above the upper edges of the bottom chord members. I The top chord comprises a plurality of laminated members 17 which are constructed in the same general manner as the top chord of the truss shown in my said prior patent. The laminations of the top chord are made in two separatedor spaced series to provide.v a longitudinal recess 11 in each top chord to receive upper ends of the web members 14. The lower strata of laminations are made wider` than the upper strata to provide ledges 20. 18v designates the roof sheathing and 19 designates purlins by which the sheathing is supported from the top chord. As shown in Figure 4, said purlins t are notched to take over the top chords and to, as by means of an anchor bolt 22. Thev bottom chord lies on and is fastened to the plates, as by means of lag screws 23 or other suitable fastening devices that extend 1 through the plates and into the bottom diagonal ends of the members 15 of the bot-1 tcm chord, and the filler 16 lextends through the slot or recess 11 in the laminated top chord, as shown in Figure 2. Said top 4and bottom chords aresecured together and to a metal stirrup 26 by a bolt or bolts 27.

\ Said stirrup is of U-shape formation. The

side members 28, 28 of said stirrup lie horiz`ontally along thesides of the bottom chordl and are secured thereto, as by means of the through bolts 29. The closed member 30 of said stirrup extends around the end of the filler 16. The laminations of the top chord bear at their ends, with anlend grain thrust, against the closed portion 30 of the stirrup 26 and the said top and bottom chords are rigidly connected to each other and to the strap by means of one or more through bolts 27. The lower strata of the laminations of the upper chord are cut to the same width as the upper strata adjacent the end so that the entire end of the upper chord may pass into the stirrup as shown in Figure 6.

An advantage ofl the construction described resides in the bringing of the. ends of the laminations of the top chord with an end grain thrustagainst the closed portion 30 of the stirrup 26, so as to thereby bring the vforce or stress of the top chord against the anchor stirrup in a position most favorable for utilizing the full strength of the top chord laminations. Moreover, the construction described, wherein the stirrup lies along the bottom chord and is rigidly fixed thereto, provides'an exceedingly rigid connection between the top and bottom chords ofl the truss through the said stirrup and the end grain thrust of the laminations `of the top chord therewith. With the construction thus shown the forces are concentric or balanced at the part of the' juncture of the top and bottom chords where the larger part of the material is assembled, or at about the point represented bv the b'olt 27.

Another advantage of the construction shown is that the bearing plate 21 may be set into the wall 10 during the-erection of said wall and in such position that the truss may be readily fastened thereto, so as to produce a rigid and durable connection between the truss and the wall structure.

A further advantage of the manner of asl sembling the stirrup with the truss elements, wherein the stirrup assumes a horizontal and parallel relation to the bottom chord, I

is that the entire truss end and the sheathing supported by the truss may be considerably lowered 'on the wall 1() and thereby and bottom chords, with the end of the bottom chord the top chord comprising a plurality of superposed laminated members, obliquely engaging the top chord inside the supporting point of the latter, and a horizontal U-shaped metal stirrup embracing so 2. In a truss, thecombination with top and fastened to the truss end, with the exi treme end of the top chord throughout its depth tted in end grain abutting contact with the closed point of said stirrup.

3. In a truss, the-combination'with top and bottom chords, said top chords embracing laminated members and a metal stirrup embracing and fastened to the truss end, the

entire. ends .of the laminations of the top chord being fitted in direct end tact with said stirrup.

` 4. In al truss, the combination with top and bottom. chords, the top chord comprising a plurality of superposed laminated s'lotted, and the end of the bottom chord obliquely abutting the top chord inside the supporting point of they latter, and a metal .members, being bowed yand longitudinally stirrup embracing and fastened to the truss end, with the extreme end of the top chord fitted throughout its depth in end grain abutting contact with said stirrup, the bottom chord being provided with .an intermediate extension which projects into the slot of the top chord at the end of the truss.

5. In combination with the top and bottom chords of 'a truss connected byvweb members, the bottom chord having a Vertical, longitudinal slot, a filler member in said slot extending endwise and at its top beyond the bottom chord and the bottom chord terminating inwardly therebeyond obliquely i l to the plane of the chord, the upper chord embracing a plurality of laminations fitted on the oblique face of the lower chord and all bearing at their ends in end grain abutting contact with a part rigid with the vlower chord, said top chord being longitudinally` slotted to receive the end of said filler member.

6. In combination with the top and bottom chords of a truss connected byweb members, the top chord comprising a plurality of superposed laminated members, said bottom chord being terminated obliquely to the plane of said bottom chord, a U-,shaped stirrup.' fitted to the bottom chord and extending at ,its closed portion beyond the bottom chord, and the top chord bearing near its end against the oblique Eortion, of the bottom chord and directly tting throughout its end with an end grain thrust against the closed part of said stirrup.

7 In combination with the top 'and bottom chords of a truss connected by web members, the bottom chord having a vertical, longitudinal slot, a vfiller member in said slot, said filler member extending end- Wise and at its top beyond the bottom chord and said bottom chord terminating obliquely `-with the close to the plane of said bottom chord, a U- shaped lsti'rru fixed to the bottom chord bottomchord, t e top chord comprising a series of laminations which fit near the end of the truss on the oblique portion of the bottom chord, with the laminations thereof all bearing directly with' end grain thrust againsthe closed part of said stirrup, and a bolt extending through the top and bottom chords and through the side members of the stirrup for iixing said parts together. Y'

In Witness whereof I claim the foregoing as my invention, I hereunto append my signature this 12 day of May, 1922.

WILLIAM J. SUMMERBELL.

ortion endwise beyond said y

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