Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Curvilinear or peaked truss
Patent
1986-06-05
1988-06-07
Friedman, Carl D.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Curvilinear or peaked truss
29155R, E04B 132
Patent
active
047487844
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to triangulated frame structures such as roof trusses, girders and others. Frame structures of the kind in question (hereinafter referred to simply as "trusses") comprise: a top chord, a bottom chord and a plurality of brace members which extend between the chords and have their ends respectively secured thereto.
Where the truss is in the form of a warren girder (for example) the two chords are usually parallel. Where the structure is a roof truss, it is common for the top chord to be in two parts having upper ends, which meet in a ridge, and lower or eave ends. The ends of the bottom chord (in such case) are secured to the top chord parts adjacent their eave ends.
BACKGROUND ART
In a purely structural sense, the prior trusses of the type discussed have been satisfactory, but their assembly and installation have not been so.
In the interests of production efficiency the practice has grown for trusses to be built in the workshop and then taken to the site ready for installation.
This in-factory production has been successful, largely because it permits the truss parts to be assembled, and the securing of the truss parts to be effected, in a jig ensuring speed and accurate uniformity of truss formation.
Notwithstanding the considerable utility of jigs in truss production, their use has its drawbacks.
In the first place, truss jigs are relatively bulky, and thus present a storage problem. A separate size of jig is required for each truss size or form, unless the jigs are furnished with movable parts; but, even if that be done, a further disability arises because it increases the complexity of the jig design and it involves time-losses in re-locating and re-setting of the jig parts to suit each different truss size or kind. Another shortcoming in the use of jigs is that where (as is usually the case) the joints connecting the truss chords and other members are made (by welding, riveting or otherwise) while the truss assembly is still in the jig; the option to assemble the truss at the workshop or at the site is denied to the builder in the case of trusses too large for convenient transport.
DISCLOSURE OF THE INVENTION
The object of this invention is to remedy the situation outlined above very simply; by the provision of a method of building a frame structure which enables the frame parts to be assembled and connected together without need for jigs, without loss of accuracy or production efficiency and with the option to assemble the frame parts in the factory or on the site fully available to the builder as may seem expedient.
The invention provides:
A method of building a triangulated frame structure of the kind composed of a plurality of subsidiary members joined by their ends to a plurality of main members intermedially of the ends of said main members; said method comprising: protrusile tongues, to accept one of said tongues within it, and located in said main members at points therein to which the end of a subsidiary member is to be joined; position they are to occupy relative to other members in the finished frame structure by entering said tongues into that one of said slots nearest to it when said members are arrayed as aforesaid, and restrained against withdrawal from said slots.
Examples of the invention, as applied to a roof truss, are illustrated in the drawings herewith.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a roof truss.
FIG. 2 repeats a fragment of FIG. 1 on an enlarged scale, and shows one of the tongues in course of truss assembly.
FIG. 3 is a side elevation of a two-part top chord in course of preparation.
FIG. 4 is an end elevation projected from FIG. 3.
FIG. 5 repeats FIG. 3 except for showing the top chord prepared for truss incorporation.
FIG. 6 shows a fragment of the same truss except for its inclusion of a minor modification.
BEST MODE OF CARRYING OUT THE INVENTION
Referring to FIGS. 1 to 5; the top chord is in two parts 7 and 8. These meet in a ridge 9 and have eave end portions 10. A bottom chord 11 exten
REFERENCES:
patent: 1451555 (1923-04-01), Schenstrom
patent: 4041659 (1977-08-01), McElhoe
patent: 4201021 (1980-05-01), Aldag et al.
Dividoff Alexander M.
Kroie Robert
Friedman Carl D.
John Lysaght (Australia) Limited
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