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 469
type (Fig. 172) having a ratchet wheel keyed to the driv-ing shaft, steel rollers carried in the teeth of the ratchet,and an outside casing fastened to the conveyor framework.Reversed motion of the shaft wedges the rollers betweenthe wheel and casing, and locks the shaft. A patented safety, stop…
Hoisting machinery · Conveying machinery
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