Traversing hoists – Having horizontally swinging boom or bridge – Extensible by movement of boom or boom segment along...
Patent
1989-04-07
1991-01-08
Basinger, Sherman
Traversing hoists
Having horizontally swinging boom or bridge
Extensible by movement of boom or boom segment along...
212186, 212230, 212264, B66C 2342
Patent
active
049828533
ABSTRACT:
A multi-stage boom having a plurality of boom members including a first boom member, at least one intermediate boom member and a last boom member, each being slideably inserted into its subordinate boom member to undergo telescopic expansion and contraction. An operating shaft is connected pivotably at its bottom portion erectly to a peripheral lower end portion of the last boom member, and a plurality of adjusting shafts are each disposed pivotably at its bottom portion erectly to a peripheral upper end portion of each boom member except the first boom member. A first tension cable is connected at its one end to a lower end portion of the first boom member, lead therefrom through an upper end opening of a subordinate boom member, turned forwardly at a top portion of an adjusting shaft disposed at a peripheral upper end portion of the subordinate boom member, and connected at its other end to an upper end portion of the first boom member. At least one intermediate tension cable is connected at its one end to a lower end portion of a corresponding intermediate boom member, lead therefrom through an upper end opening of a subordinate boom member, turned forwardly at a top portion of an adjusting shaft disposed on a peripheral upper end portion of the subordinate boom member, and connected at its other end to a top portion of another adjusting shaft disposed on a peripheral upper end portion of the corresponding intermediate boom member. A last tension cable is connected between a top portion of the operating shaft and a top portion of an adjusting shaft disposed on a peripheral upper end portion of the last boom member. A control mechanism controls tilting angle of the operating shaft according to expansion amount of the multi-stage boom to tension a chain of the first, intermediate and last tension cables.
REFERENCES:
patent: 3534867 (1970-10-01), Johnston
patent: 3638806 (1972-02-01), Hippach
patent: 4363413 (1982-12-01), Gyomrey
patent: 4492312 (1985-01-01), Poock
patent: 4523669 (1985-06-01), Smith
Adams Bruce L.
Basinger Sherman
Brahan Thomas J.
Hikoma Seisakusho Co., Ltd.
Wilks Van C.
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