Load-lifting crane

Details Load-lifting crane Load-lifting crane

1978-08-16

1980-09-09

Sheridan, Robert G.

Traversing hoists

Having counterweight or counterbalancing means

Counterweight movable relative to load support

B66C 2368

Patent

active

042213002

ABSTRACT:
The load-lifting crane has a jib mounted on its framework, the end of the jib having an extension connectable thereto, the ends of the jib and of the extension carrying blocks over which a run of the rope coming from the winch is adapted to be alternatively guided to form a tackle arrangement supporting a load-engaging device. The ends, respectively, of the jib and of the extension have each mounted thereon an additional block adapted to have a run of the rope coming from the tackle, which is the double one, running over it, the end of the last-mentioned run being secured to the framework. The block over which runs the run of the rope, coming from the winch, and the respective additional block are offset relative to each other laterally of the jib by an extent not short of the diameter of the rope. The extension is connected to the jib for rotation about a horizontal axle mounted on the jib adjacent to the blocks thereof, on the framework-facing side, whereby with the extension being rotated, the rope is guided over from the blocks of the jib onto those of the extension.

REFERENCES:
patent: 1920370 (1933-08-01), Forsythe
patent: 3868022 (1975-02-01), Greenlay et al.

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