Extension jib for a boom

Details Extension jib for a boom Extension jib for a boom

1988-10-05

1989-05-09

Basinger, Sherman D.

Traversing hoists

Having means facilitating assembly or disassembly

Of traversing hoist from support

212187, 212266, B66C 2370

Patent

active

048281247

ABSTRACT:
A retractable extension jib for a telescopic boom has frame body rotatably mounted on an end of the boom so as to be rotated about a rotary axis, a horizontal shaft provided at a lower portion of the frame body and rotatably connecting a base portion of the extension jib. A pair of oil hydraulic cylinders are provided between a base portion of the extension jib and an upper portion of the frame body so as to rotate the jib about the horizontal shaft. The hydraulic cylinders are so arranged as to rotate the extension jib from a retracted position to a lower position where a longitudinal axis of the jib is substantially parallel with the rotary axis.

REFERENCES:
patent: 3831771 (1974-08-01), Wiencek
patent: 4044952 (1977-08-01), Williams et al.

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