B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
212/15
B66C 23/68 (2006.01) B66C 23/70 (2006.01)
Patent
CA 2015519
A jib stretching and folding device including an auxiliary connector mounted on a lower surface of a jib in the vicinity of a base end portion of the jib under the jib folded condition. The auxiliary connector includes a cylindrical housing fixed to the lower surface of the jib and a connecting rod supported to the housing in such a manner as to be rotatable about the axis of the connecting rod substantially parallel to the lower surface of the jib and be movable along the axis of the connecting rod. The jib is twisted about the axis of the connecting rod to effect a jib stretching or folding operation. A twist guiding groove is formed on one of the housing and the connecting rod of the auxiliary connector, and an engagement projection is provided on the other of the housing and the connecting rod to engage the twist guiding groove. When the jib is raised or lowered by a jib raising/lowering means, the engagement projection is moved in the twist guiding groove to generate a jib twisting force. Thus, the jib is automatically twisted in the jib stretching or folding operation. Accordingly, a burden of labor of an operator in stretching and folding the jib can be reduced. Further, the operation can be made continuous to thereby improve the efficiency of the jib stretching and folding operation.
Kabushiki Kaisha Kobe Seiko Sho
Riches Mckenzie & Herbert Llp
LandOfFree
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