Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 298
Bwhich operates right- and left hand-screws by means of the lever h. The clamps-slide in radial grooves. The nuts for the right- and left-hand screws can beclosely adjusted and clamped by set screws, so that a radial movement of lessthan ^ is sufficient to throw the clutch in or out of action.… … FiG. 620. nest part. From the thickest part of the ring A a strong arm proceeds to acentral boss which is keyed to the shaft. This ring, arm, and boss are all castin one piece. An outer ring or shell B is bored or turned to fit easily over the
Mechanical drawing
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