Traversing hoists – Overhead – Cable
Patent
1976-09-09
1978-02-28
Oresky, Lawrence J.
Traversing hoists
Overhead
Cable
212 3R, 212 58R, 212 66, B66C 2372, B66C 2352
Patent
active
040761282
ABSTRACT:
In a rotary crane whose boom has two longitudinal members pivotally fastened to a turntable in transversely spaced relationship and converging radially outward from the upright turntable axis toward respective outer terminal portions fastened to each other, two of the several undercarriage assemblies depending from the turntable for movement along a circular track are fastened to the turntable below the fastened terminal portions of the boom members, and compression members of a column extend upward and rearward from the junction of the boom members with the turntable. The boom is held in its angular position by a tension member whose end portions are fastened to the column and to the outer terminal portions of the boom member, a load may be hoisted by varying the effective length of a hoisting cable trained from the column over the outer end of the boom, and a counterweight is mounted on the turntable diametrically opposite the boom. The direct transmission of operating stresses from the boom and the column to the subjacent undercarriage assemblies and the track without significant flexural stresses makes the crane suitable for particularly heavy loads.
REFERENCES:
patent: 723731 (1903-03-01), Reise
patent: 2035385 (1936-03-01), McLean
patent: 2513726 (1950-07-01), Huston
Berman Hans
Oresky Lawrence J.
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