Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 247
934. EXPANDING PULLEY.—The sec-tional rim pieces with their arms have a radialsliding joint on the hub arms, and are movedout or in by pins projecting into the spiralslots on the central spur-gear wheel. Themovement of the wheel ^, by turning the ratchetpinion d, moves all the sections of the…
Mechanical movements
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