Static structures (e.g. – buildings) – Barrier or major section mounted for in situ repositioning;... – Rotatable about vertical axis
Patent
1984-02-14
1986-09-16
Ridgill, Jr., James L.
Static structures (e.g., buildings)
Barrier or major section mounted for in situ repositioning;...
Rotatable about vertical axis
52116, 212253, 414744R, E04B 1346
Patent
active
046114408
ABSTRACT:
Walking dragline base frame and revolving frame having an internal web grid of triangular cells in a concentric series of annular girders. Cell plates are oriented in circular and spiral arc arrangements, the spiral arcs extending both left hand and right hand in crossing relation. Segmented rail beam and rail pad structures are provided concentrically in one of the annular girders of the frames connected with intersecting diagonal web plates of the associated annular girder. The rail pads may be of double-T structure. A relative stiffness ratio of base frame and revolving frame approaching 1:1 is attained and wherein the revolving frame may be centrally of diminished depth and the base frame of complementary greater central depth.
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patent: 4329795 (1982-05-01), Kalve
patent: 4371086 (1983-02-01), Sankey et al.
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