Electric Hoists to Help Handling
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ONE of the most useful mechanical handling devices in a works, or, in fact, anywhere where loads have to be transported within fixed areas, is the electric hoist. R. D. Cardiff, Ltd., 34B, York Way, Kings Cross, London, NJ, has for some years been specializing in a series of these appliances known under the title of " Ardcar."
Its latest model is the Hoistmaster. which is made in a range to deal with loads of from 5 cwt. to 5 tons. These embody special features making for easy handling, safety and long life, combined with reasonable size. simplicity and low headroom. Moving parts have been reduced to the minimum, and ball or roller bearings are fitted throughout. They can be fixed, or arranged for pushing, or travel be band chain or by electric power. .
The bogie chassis is readily adjustable to operate on various girder sizes and can be obtained in articulated form if required. An important point is that because of the worm reduction drive, the load cannot take control in the event of brake wear or failure. The motor is totally enclosed and readily
detachable, whilst the electromechanical brake gives accurate control.
An automatic switch prevents overwinding, and a lowering limit can be supplied if required. Even the wire rope is of special construction. It has a central core which acts as a wick to retain the lubricant, and around this the layers of wire are wound in alternating directions, thus obviating the tendency to twist.
Where ropes have to be renewed fairly frequently, as in busy factories, a novel splicing, device permits th, change to be effected in the matter of minutes, This splice" exercises -4 powerful and positive wedging action_ Standard models cover voltage ranges from 200 to 550, all 50 phase. A variation of the standard hand-chain type allows traversing and hoisting to be controlled away from the job. Grease lubricating nipples are provided ss11-ere necessary