Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 351
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 ^ smaller friction surface to the worm… … 1413. SAFETY TACKLE.—The horizontal frameis pivoted in the hook block having a friction shoulder.A lanyard from the eye of the horizontal frame releasesthe grip.
Mechanical movements
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