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| Hoists | 56.19001 – 56.19018 | |||||||||||||||||||||||||||||||||||||||||||||||||
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50 FR 4054, Jan. 29, 1985, unless otherwise noted.
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Subscribe to: 30 CFR Part 56 Subpart R - Hoists
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Hoists shall have rated capacities consistent with the loads handled and the recommended safety factors of the ropes used.
Hoists shall be anchored securely.
Belt, rope, or chains shall not be used to connect driving mechanisms to man hoists.
Any hoist used to hoist persons shall be equipped with a brake or brakes which shall be capable of holding its fully loaded cage, skip, or bucket at any point in the shaft.
The operating mechanism of the clutch of every man-hoist drum shall be provided with a locking mechanism, or interlocked electrically or mechanically with the brake to prevent accidental withdrawal of the clutch.
Automatic hoists shall be provided with devices that automatically apply the brakes in the event of power failure.
All man hoists shall be provided with devices to prevent overtravel. When utilized in shafts exceeding 100 feet in depth, such hoists shall also be provided with overspeed devices.
Where creep or slip may alter the effective position of safety devices, friction hoists shall be equipped with synchronizing mechanisms that recalibrate the overtravel devices and position indicators.
An accurate and reliable indicator of the position of the cage, skip, bucket, or cars in the shaft shall be provided.
Hoist controls shall be placed or housed so that the noise from machinery or other sources will not prevent hoistmen from hearing signals.
Flanges on drums shall extend radially a minimum of 4 inches or three rope diameters beyond the last wrap, whichever is the lesser.
Where grooved drums are used, the grooves shall be of suitable size and pitch for the ropes used.
Where any diesel or similar fuel-injection engine is used to power a hoist, the engine shall be equipped with a damper or other cutoff in its air intake system. The control handle shall be clearly labeled to indicate that its intended function is for emergency stopping only.
In a friction hoist installation, tapered guides or other approved devices shall be installed above and below the limits of regular travel of the conveyance and arranged to prevent overtravel in the event of failure of other devices.
Each electric hoist shall be equipped with a manually-operable switch that will initiate emergency braking action to bring the conveyance and the counterbalance safely to rest. This switch shall be located within reach of the hoistman in case the manual controls of the hoist fail.
When an overtravel by-pass switch is installed, the switch shall function so as to allow the conveyance to be moved through the overtravel position when the switch is held in the closed position by the hoistman. The overtravel by-pass switch shall return automatically to the open position when released by the hoistman.
[50 FR 4054, Jan. 29, 1985; 50 FR 20100, May 14, 1985]