Dragline with high headroom between upper and lower structures

Details Dragline with high headroom between upper and lower structures Dragline with high headroom between upper and lower structures

1995-09-29

1997-07-01

Melius, Terry Lee

Excavating

Cable-operated

Boom-type

37394, 37395, 212253, E02F 358

Patent

active

056425775

ABSTRACT:
Heavy machinery comprising a lower support structure having an upper surface, and an upper structure having a generally horizontal lower surface facing the upper surface of the lower structure, the upper structure being supported above the lower structure for rotation relative to the lower structure about a generally vertical axis, and the lower surface of the upper structure having therein an upwardly extending recess surrounding the axis to provide space for a person working on the machinery, the recess being defined at least in part by an upper wall above and generally parallel to the lower surface, and by a plurality of generally planar facets surrounding the axis, each of the facets extending transversely to the upper wall and to the lower surface.

REFERENCES:
patent: 1001299 (1911-08-01), Page
patent: 1511437 (1924-10-01), Bager et al.
patent: 4014399 (1977-03-01), Ruder
patent: 4406339 (1983-09-01), Spencer
patent: 4555032 (1985-11-01), Mick et al.
patent: 4769932 (1988-09-01), Kalve
patent: 5154012 (1992-10-01), Kallenberger
patent: 5154013 (1992-10-01), Kallenberger

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