TELESCOPIC CRANE BOOM HAVING A JIB FOR EXTENDING THE REACH OF THE BOOM

摘要

1486358 Telescopic crane booms HARNISCHFEGER CORP 15 Dec 1975 [20 Dec 1974] 51216/75 Heading B8B A telescopic crane boom B includes a jib J selectively attachable in line with the boom B. In Fig. 1 the jib S is shown in the stored position alongside the boom B on support assemblies 36. In order to swing the jib J into line with the boom B for connection thereto hinge links 56 on hinge members 37 on the boom B are attached to hinge members 38 on the jib J. The jib can then be moved into line as shown in Fig. 10, bearings 41 on the jib J co-operating with rod 40 on the boom B to form a pivotal connection. The jib J may be supported for use in line with the boom B, or at an angle thereto; by guy lines (GR), (GF1), Fig. 8 (not shown), in conjunction with a mast (M), Figs. 3, 4 (not shown), erected by extension of boom section BIV out of section BIII.