Method and apparatus for extending a boom assembly

Details Method and apparatus for extending a boom assembly Method and apparatus for extending a boom assembly

B - Operations, Transporting

66

C

212/28.3

B66C 23/68 (2006.01) B66C 23/70 (2006.01)

Patent

CA 1067862

METHOD AND APPARATUS FOR EXTENDING A BOOM ASSEMBLY Abstract of the Disclosure: The overall length of boom assembly can be increased by the use of a pair of boom extension sections. When the boom extension sections are not required, they are sup- ported at storage locations adjacent to one side of a main boom assembly. When the overall length of the main boom assembly is to be increased, a First one of the boom extension sections is pivotally connected with the outer end portion of the main boom assembly and the second boom extension section is pivotally con- nected with the outer end portion of the first boom extension section. The two boom extension sections are swung outwardly together around the outer end of the main boom assembly. After the first boom extension section has been firmly connected with the outer end portion of the main boom assembly, the second boom extension section is pivoted about the outer end portion of the first boom extension section. A gantry frame is then erected to hold the two boom extension sections against movement relative to each other so that the two boom extension sections form a rigid structure which increases the overall effective length of the boom assembly. In order to guide movement of the second boom extension section from its storage position into engagement with the first boom extension section, a roller on the second boom extension section rolls along a track which is connected with the main boom assembly. As the second boom extension section is moved into engagement with the first boom extension section, the roller moves off the track to thereby release the second boom extension section for movement away from the main boom assembly. -1-

290833

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