Rotary crane structure with a selective drive on power unit

Details Rotary crane structure with a selective drive on power unit Rotary crane structure with a selective drive on power unit

1975-02-06

1976-05-11

Spar, Robert J.

Traversing hoists

Overhead

Cable

212 28, 212144, B66C 2372

Patent

active

039556840

ABSTRACT:
A rotary crane assembly of the type which is stationarily supported on the ground and which assembly includes a large mounting ring on which a revolvable frame is supported for revolving about a generally vertical axis. The revolvable frame has an upwardly extending boom and also a mast, both of which can be vertically positioned between a horizontal position and an upwardly extending working position. The assembly also includes a mobile power unit which can be driven up on the frame and located diametrically opposite above the ring from that side on which the mast and boom are pivotably mounted. Thus, the mobile power unit is secured in place on the frame and provides the power and counterbalancing for the boom and mast and by means of which the boom and mast can be erected. The mobile power unit may be of either the endless track type or rubber track type and a self-propelled unit having a lower ground engaging portion and an upper revolvable portion containing the host drums.

REFERENCES:
patent: 3485383 (1969-12-01), Beduhn
patent: 3777900 (1973-12-01), Brewer
patent: 3868022 (1975-02-01), Greenlay et al.

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