Jib crane hoist rope support - is moved along jib in same direction as crab but more slowly

摘要

The support is for the hoist rope (21) of a jib crane whose hoist crab (5) travels along the jib (1) under the action of a drive mechanism (7) to vary the working radius. The support (27) is moved along the jib by a second drive mechanism (31) in the same direction as the crab, but at a slower speed. Where there are several supports, each can be driven at a speed equal to that of the crab multiplied by the ratio of the distance between the support and the nearest end of the jib to that between the crab and this end. USE/ADVANTAGE - Hoist rope support system is simple, reliable, and reduces rope sag.