Jib stretching and folding device for use in a crane

Details Jib stretching and folding device for use in a crane Jib stretching and folding device for use in a crane

1991-09-12

1992-09-01

Basinger, Sherman

Traversing hoists

Having means facilitating assembly or disassembly

Of traversing hoist from support

212168, 212266, B66C 2342

Patent

active

051432331

ABSTRACT:
A jib stretching and folding device is used in a crane having a jib for increasing a lift of the crane, the jib being stretchable from a folded position along a side surface or a lower surface of a boom through a vertically suspended position. The jib stretching and folding device has a jib maneuvering cylinder, an engaging portion formed in a piston rod of the cylinder, an engaging member provided on the jib, and a guide surface formed at at least either of the engaging portion or the engaging member for guiding the engaging member so as to engage with the engaging portion. The jib is made movable between the vertically suspended position and the folded position by way of extension and contraction of the piston rod.

REFERENCES:
patent: 4491229 (1985-01-01), Behrendt
patent: 4493426 (1985-01-01), Sterner
patent: 4621742 (1986-11-01), Rathi
patent: 4828124 (1989-05-01), Iga
patent: 4923071 (1990-05-01), Koizumi
patent: 4953724 (1990-09-01), Koizumi

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