Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Three-dimensional space-defining
Patent
1997-06-24
1999-09-28
Graysay, Tamara L.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Three-dimensional space-defining
52112, 5265101, 52690, 52693, E04H 1200
Patent
active
059569158
ABSTRACT:
A drill mast has two tubular side chords and a central chord equally spaced from the side chords. The central chord is joined to the side chords by transverse and diagonal tubular lacing members. Space frames formed of tubular members extending from spheres are connected to each of the chords. The spheres are aligned along a line equidistant from the chords.
REFERENCES:
patent: 3360288 (1967-12-01), Holscher
patent: 3371458 (1968-03-01), Sturgill
patent: 3561711 (1971-02-01), Dodge
patent: 4503645 (1985-03-01), Nudd et al.
patent: 4595066 (1986-06-01), Nelmark et al.
Gilmore Carl D.
Hammel Kenneth W.
Piper James P.
Szpek Frank R.
Bucyrus International, Inc.
Graysay Tamara L.
Kang Chi H.
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