US1476995A - Truss - Google Patents

Description

Dec. l1 1923.

J. A. MILLER TRUSS Filed April 25, 1923 7 .1J if lf. QU 1 S a I W 1h11 i: LL; J, J i.

Patented Dec. 1l, 1923.

VUNITED STATES JOHN A. MILLER, OF HOMEWOOD, ILLINOIS.

TRUSS.

Application led April 23, 1923. Serial N'o. 638,885.

To all whom. it may crm cern Be it known that I. JOHN A. MILLER, a citizen of the United States, and a resident of Homewood. in the county of (`ook and State of Illinois. have invented certain new and useful Improvements in Trusses. of which the following is a specitication.

My invention relates to trusses of the type disclosed in my Patent No. 1.438.452 of December 12, 1922. in which parallel laminated arch members are spaced apart bv web blocks or short lengths of planks.

The object of the invention is to procure greater stiffness, rigidity and strength without increasing the. weight. In my present arrangement the blocks or short plank lengths of each longitudinal row are displaced longitudinally or spaced apart. but` the rows are longitudinally offset so that the blocks of one row will bridge between-the blocks of the other row, and at the same time the blocks of one row are interjointed or inter-connected at their ends with the ends of the blocks of the other row so that `the blocks 'form a web chain which of itself forms a strong truss structure and which together' with the laminated arch members will form an exceedingly rigid and strong truss which in comparison with its radial thickness may have a very long spanand will support heavy loads with safety.

0n the accompanying drawing which illustrates my improved construction and arrangement. i

Fig. 1 is a side elevational view of a truss.

Fig. 2 is au enlarged side elevational view of a section of the truss. and

Fig. 3 is a sectional view on plane 3 3, Fig. Q.

The truss structure shown comprises the outer and inner arch members a and b and the web part designated as n whole c, the arch parts hein, r parallel. The. member o is progressively built up of boards l0 t o the desired height, the boards being held one against the. other by nails l1. the boards breaking joints and overlapping. The innerr arch member Iris formed up in a similar manner of boards l2 held together by nails 13.

The web section of the truss is'builtl up of blocks 14 cut from planks of the desired thickness. The blocks are all of the same shape and are rectangular. The blocks of the upper row are spaced apart. and enl gage with their upper edges afainst the arch member a, while the blocks o the. lower row are similarly spaced apart and engage with their lower members against the arch member l). The rows are longitudinally otl'set so that the blocks of one row will bridge the blocks of the other row, and then bolts 15 are extended through the arch members and through thev overlapping ends of 'the blocks. the blocks being set; midway between th sides of the arch members with their inner edges in register.

The arch members am usually built up on tlie ground, suitable template or other guide arrangement being provided so that the arch members will assume their pro r curvature. The blocks can be inserted a ter formation of the arch members or the inner boards of the arch members can r'stbe spiked to the respectire blocks and then the other laminations applied until the arch members have been built .up.. The arch members with'lthe-blocks secured thereto are. then broughttogether and the bolts applied.

To [strengthen the varch members and blocks`\ against longitudinal displacement and also lto increase the bracing effect of the blocks the blocks are cut away at their inner corners -to leave the' notches 16, and the tongues 1T.' When the blocks are assembled the ends of the blocks will engagengainst--the ton ues of adjacent blocks and nally nterjointed and inter-connected so that the blocks will form a continuous chain. The blocks thus interconnected and secured transversely by the bolts will of themselves form a rigid truss structure which together with the laminated arch members will form an exceedingly strong truss whose span can be niade very lon" com ared with its vertical thickness, andhwhic will sustain heavy loads with great safety. After formation of the trusses they are set upon suitable supporting pillars 18 of mason work or concrete.4 The arrangement is particularly adaptable4 for low buildings such as dance pavilions, skating pavillons, auditoriums or the -like where exten ed Hoor space is desired without; intervenngcolumns alndsup` ports. The truss can ibo inexpensively constructed, stock lumber being used for the arch members, and the blocks can be out from planks or from'odds and ends. When the arch members and blocks are assembled the grain of the wo'od is parallel with` the the blocks will e thus positively longituditruss throughout its extent and this together with the interlinked blocks gives the arch its great strength and rigidity.

I claim as follows:

1. In a truss structure, the combination of outer and inner arch members and a web structure, said arch members being each built up of laminations and being parallel, the web structure'comprisng an outer row of blocks and an inner row of blocks, the blocks of each row being spaced apart and the blocks of one rou' being longitudinally offset from but overlapping the blocks of the other ron', and bolts extending transversely through said arch membersV and the overlapping ends of said blocks.

2. In a truss Astructure, the combination of outcr and inner laminated parallel arch members, a web structure composed of short blocks arranged in outer and inner rows, the blocks of the outer row being spaced apart and those of the inner Vroufbeing correspondingly spaced apart, the blocks of the' outer row abuttinr against the outer arch member and the blocks of the inner row abutting against the inner arch member, the blocks engaging at their inner edges and those of one row bridging over the s aces between the blocks of the other row, lts extending transversely through said arch members and the overlapping ends of said blocks. and abutments on said blocks extending into the spaces between associated blocks for locking said blocks against longitudinal displacement.

3. In a. truss structure, the combination of an outer arch member and an inner arch member parallel therewith, said members be ing spaced apart a. short distance as oompared with their length, web members in the form of short blocks set on edge between the arch members and arranged in outer and inner rows, the blocks of each row being spaced apart and the blocks of one row bridging the spaces between the blocks of the other row, theI ends ofthe blocks being nterjointed, and bolts extending transversea l! through the arch members and through t ie interlointed ends of said blocks.

4. In a. truss structure, the combination of outer and inner laminated arch members, said members being parallel and being spaced apart a short distance as compared 'with their lengths, a web structureK composed of blocks in the form of short lengths of plank, the blocks being set on edge between the arch members and arranged in longitudinal rows, the blocks of each row bein spaced apart and the blocks of one rowl ridging the` spaces between the blocks of the other row, each block having an abutment tongue extending between the ends of the blocks which it bridges whereby said blocks will be interjointed, and bolts extending transversely through the arch members and through the inter1ointcd ends of said blocks.

In WitnessI whereof, I hereunto subscribe my name this 17th day of April A. D., 1923.

JOHN A. MILLER.

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