Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 350
1411. HARRINGTON CHAIN HOIST.—Aworm gear operates a double-chain sprocket, withchains yoked at hook. … 1412. YALE DUPLEX HOIST.—A wormF meshed in a gear on the same shaft with thehoisting-chain sprocket. A, Hand-chain sprocketon worm shaft B; C is a friction plug whichholds the worm from running back. For self-running down, the plug may be reversed, present-ing a smaller friction surface to the worm…
Mechanical movements
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