Extension and retraction means for the telescopic boom...

Details Extension and retraction means for the telescopic boom... Extension and retraction means for the telescopic boom...

B - Operations, Transporting

66

C

214/20, 212/28.7

B66C 23/70 (2006.01)

Patent

CA 1044186

EXTENSION AND RETRACTION MEANS FOR THE TELESCOPIC BOOM ASSEMBLY OF A CRANE Abstract of the Disclosure Means for extending and retracting the telescoping boom assembly of a rotatable mobile crane wherein the boom assembly comprises a plurality of telescoping parts, slidably received one into the other. The boom extension and retraction means is operable at any angular displacement of the boom assembly, the operating angle of the boom assembly being maintained during the extension or retraction thereof. Means for extending and re- tracting the boom assembly include a single fluid driven linear motor or hydraulic cylinder suitably attached at one end portion of the motor to a base portion of the boom assembly. An opposite end portion of the linear motor is selectively securable to the telescoping sections of the boom assembly to permit extension thereof. A cylinder guide is mounted on the fluid driven linear motor, both the cylinder guide and motor contained within the boom assembly, the cylinder guide providing support for the linear motor and maintaining the alignment of the extension and retraction means. The extension and retraction means also includes a single latch mechanism comprising first latching means fox extension and retraction of the telescoping boom sections of the boom assembly, and second latching means for locking the boom assembly in position.

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