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TAE Marine REVIEW 33 "CYCLONE" HIGH-SPEED CHAIN HOIST With Self-Lubricating Bearings High Efficiency High Speed Great Durability All Gears Cut "THE lift wheel, Fig. 1, that is the sprocket wheel which carries the lift chain, is cast in one piece with the spur wheel that drives it. This double wheel turns freely upon a hollow shaft rigidly supported at both ends in the frame. The spur wheel is encircled by a yoke having internal teeth meshing into the spur wheel teeth and driven with a gyrating movement into the spur wheel placed diametrically opposite. See Fig. 2. The hand wheel shaft passes through the hollow main shaft carrying at the further end a pinion which drives two spur wheels, one on each of the two eccentric shafts. See Fig. 3. The number of the teeth in the spur wheel divided by the difference between the number of the spur wheel teeth and the numberof the internal teeth of the yoke equals the number of revolutions of the / eccentric necessary to turn the lift wheel Fig. 1. once. (In the one-ton size, the spur wheel has twenty-one teeth, the yoke twenty-four internal teeth, and the eccentrics turn seven times to each revolution of the lift wheel.) The teeth are cut with accuracy and work smoothly together. There are a number of them in contact, insuring great strength. The eccentric shafts have bearings at both ends and roller bushed connection with the yoke. All bearings have self-lubricating Graphite Bronze Bushings. There are no overhanging bearings in the Hoist, so that under the full load the frame will not spring and bind the working parts. The extreme simplicity and great strength of this construction is apparent. It is as practicable for the twenty-ton size as for the half-ton without undue increase in size or weight. The friction loss of this movement is so slight (the efficiency is about eighty per cent,) that it 3 tons and larger sizes has been found practicable to gear the Hoists to a very SC toprandultoueiece madcias ROVE: high speed, higher than that of any other Hoists yet made as above. manufactured, without increasing the hand wheel pull above that of other slower hoists. The automatic brake permits the spinning of the hand wheel in either direction when there is no load, locks the load with perfect safety, and yet per- mits its free lowering by a very slight reverse pull on the hand chain. as 5 | xm. ae) as Fee IN a--™@ IT RII eS t= =F = Send for Complete Illustrated Catalogue of Hoists and Trolleys. THE CHISHOLM & MOORE MFG. CO. CLEVELAND, OHIO