Mobile crane

Details Mobile crane Mobile crane

B - Operations, Transporting

63

B

212/23

B63B 23/00 (2006.01) B66C 23/42 (2006.01) B66C 23/70 (2006.01)

Patent

CA 1224752

A B S T R A C T The invention relates to a mobile crane with a main boom or mast, which can be brought in an upward position on a crane substructure. According to the invention the extendible and retractable luffing jib (13) is hingedly supported by the main boom (10,25) which can be positioned in a horizontal position, which luffing jib (13) protrudes at its rear side over some distance beyond the main boom (10,25), whereby a first block of sheaves (15) is fitted on the main boom (10, 25) at a lower level than the luffing jib (13) while wire ropes (19, 20) are reeved between these sheaves (15) and a second block of sheaves (14) mounted on the rear end of the luffing jib (13) for luffing the luffing jib (13) as well as for hoisting.

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