B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
212/28.3
B66C 23/42 (2006.01) B66C 23/68 (2006.01) B66C 23/70 (2006.01)
Patent
CA 1150198
METHOD OF EXTENDING A JIB OF A TELESCOPIC CRANE ABSTRACT OF THE DISCLOSURE Method for extending a jib of a telescopic crane which jib may be stored alongside a base section when not in use. The crane boom comprises at least the base section, a second section with linearly extendable power means, an extension pivotably mounted on the outer end of the second section and stored alongside that section and the base section, and a jib releasably attached to both the base section while in storage and to the extension while in use. To set up the crane for operation, the power means extends the second section forward from the base section, which extends in a forward direction the extension pivotally attached to the second section. This extension places the outer end of the extension in vertical alignment with the inner end of the jib. The extension and jib are then connected along their lengths and the jib is released from its storage position on the base. The inner end of the extension is pivoted around the outer end of the second section and the inner end of the jib is pivoted around the outer end of the extension. Both the extensions and the jib are fixed in an operative position. If the jib is not required, it is left in its attached position on the base, and the base section, second section, and boom extension may be operated independently.
382351
Harnischfeger Corporation
Smart & Biggar
LandOfFree
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