Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry (1921)
Wright, Roydon Vincent, 1876- ed, Little, John G., joint ed, Augur, Robert C., joint ed · New York, N.Y., Simmons-Boardman Publishing Co · leaf 565
threads—either right hand orleft hand. Rotating the worm (by the handwheel) causes the nutto move up or down on the shaft. By means of a sliding block, or pair of blocks, the nut bears against arras ortrunnions formed on the pitman shaft, causing it to oscillate,hence moving the pitman arm. (D) The…
Hoisting machinery · Conveying machinery
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