Vertically pivotable boom bending device for crane

Details Vertically pivotable boom bending device for crane Vertically pivotable boom bending device for crane

1982-04-01

1983-09-13

Blix, Trygve M.

Traversing hoists

Having vertically swinging boom

Having means to swing boom vertically

212187, B66C 2382

Patent

active

044037040

ABSTRACT:
A vertically pivotable boom bending device for a crane including a main boom, a vertically pivotable boom including an inner boom section connected to the main boom for vertical pivotal movement and an outer boom section connected to the inner boom section for vertical pivotal movement, an articulating rope extending from a main body of the crane to the inner boom section, a rope winding device for paying out and gathering in the articulating rope and first tension means connecting the main body to the outer boom section. The device includes second tension means connected at one end to the main body and at the other end to the outer boom section for pivotal movement in a vertical plane. A point of connection of the inner boom section to the main boom, a point of connection of the inner boom section to the outer boom section, a point of connection of the second tension means to the main body and a point of connection of the second tension means to the outer boom section are arranged such that imaginary lines connecting these points of connection together substantially form a parallelogram. With the link motion including the four points of connection arranged to form a parallelogram, the vertically pivotable boom can be raised or lowered by the articulating rope by bending same at the junction of the inner boom section and the outer boom section and keeping the outer boom section substantially horizontal at all times.

REFERENCES:
patent: 2366574 (1945-01-01), Taylor
patent: 3325018 (1967-06-01), Wright
patent: 3722705 (1973-03-01), Gould

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