B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
212/28.3
B66C 13/00 (2006.01) B66C 23/70 (2006.01)
Patent
CA 1210363
ABSTRACT A method for stretching and folding an extension jib in a wheeled type crane including a telescopic boom, and a suspension-rod-supported com- pression column type extension jib to be supported in a flat posture at the fore end of the boom in stretched state through right and left jib foot portions rotatably engaged with horizontal boom point pins extending transversely of said boom at the fore end thereof, the method comprising: (a) providing on opposite sides of the extension jib right and left jib foot portions disengageably engageable with the boom point pins, one of the jib foot portions being rotatable relative to said boom about an axis extend- ing in the axial direction of the jib; (b) stretching the jib from a folded position in which the top and bottom sides of the jib are disposed in upright posture along one side of the boom, by engaging the one jib foot portion with the boom point pin on the folding side and turning the boom into an inclined position from a horizontal position, rotating the jib around the axis of the boom point pin into a vertically suspended position; (c) turning the jib in said suspended position; (c) turning the jib in said
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Koizumi Yukio
Miyazawa Hiroshi
Kabushiki Kaisha Kobe Seiko Sho
Riches Mckenzie & Herbert Llp
LandOfFree
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