Apparatus for raising & lowering a mast and boom on a mobile cra

Details Apparatus for raising & lowering a mast and boom on a mobile cra Apparatus for raising & lowering a mast and boom on a mobile cra

1975-10-23

1977-09-27

Makay, Albert J.

Traversing hoists

Overhead

Cable

212 46R, B66C 2354

Patent

active

040505863

ABSTRACT:
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.

REFERENCES:
patent: 3037641 (1962-06-01), Potter et al.
patent: 3374901 (1968-03-01), Ferwerda
patent: 3485383 (1969-12-01), Beduhn
patent: 3874532 (1975-04-01), Metailler
patent: 3884359 (1975-05-01), Suverkrop
patent: 3944081 (1976-03-01), Wellman

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