Self-erecting mast and boom

Details Self-erecting mast and boom Self-erecting mast and boom

B - Operations, Transporting

66

C

212/38

B66C 23/62 (2006.01) B66C 23/36 (2006.01) B66C 23/74 (2006.01)

Patent

CA 1049453

ABSTRACT OF THE DISCLOSURE A self-erecting mast and boom for a lift crane including self-storing mast cylinders for erecting the mast and rotating a pivoted boom carrier into position to receive the boom which may then be raised by the boom hoist mechanism of the crane. A back hitch assembly including hydraulic cylinders is employed to initially raise the mast and the gantry members which may be lowered into horizontal position to reduce the crane profile for self-propelled transport between job sites. Counterweight lift links are connected between the gantry and the counterweight and the back hitch cylinders may be used to mount and demount the counterweight and the boom hoist winch. The masts, gantry members and back hitch cylinders may also be demounted to further reduce weight.

263720

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