| 摘要 |
A screw threaded reciprocating cable drive means comprised of an elongated, screw threaded pulley drum, fixed to a drive shaft, connected to a reversible motor means by a telescopic coupling. A nut, fixed relative to a frame, is carried on the screw threaded drum whereby reciprocating movement is imparted to the drum when the motor means is alternately energized in forward and reverse directions. Cable means engaged in the screw threads of the drum are driven thereby without traveling with the drum.
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