OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 6 Cranes, Hoists and Lifting Devices

Section 77 Equipment requirements

A chimney hoist is used in the construction of chimneys, stacks, silos and similar structures. Chimney hoists are typically a freely suspended bucket, platform or cage. They are constructed progressively upwards.

Section 77(a)

“Positive drives” means that the load-carrying unit is driven in both up and down directions. “Non-positive” (free-wheeling) means that the load-carrying unit is driven in the up direction and may be permitted to descend freely.

Section 77(b)

Installation of a clutch is prohibited to prevent disengagement of the positive drive mechanism either through mechanical failure or accidental activation of the clutch control.

Section 77(c)

The hoist operator must be aware of the hoist’s speed if the hoist is capable of operating at speeds in excess of 0.6 metres per second. Section 78 prohibits lifting a worker at a speed greater than 0.6 metres per second.

Section 77(d)

This requirement is intended to ensure that the hoist platform or bucket is prevented from falling in the event of a hoisting cable failure or other mechanical malfunction. More than one braking system is required and each must be capable of stopping one and one-half times the maximum load rated capacity travelling at the maximum rated speed.

Section 77(e)

Requiring a swivel recognizes that wire ropes have a tendency to rotate. A swivel keeps the platform or bucket from rotating.

Sections 77(f) and 77(g)

No explanation required.