FIELD: mechanical engineering. SUBSTANCE: hand doubler has drive screw connected with flywheel, threaded bush engageable with screw and connected with rod of spring-loaded piston of drive, additional screw with thread of opposite direction and lesser diameter and pitch which is engageable with threaded bush and mounted for axial displacement relative to drive screw and contact with piston of drive. Both screws and threaded bush are mounted coaxially relative to piston of drive. Threaded bush is connected with cover of drive and with piston for axial displacement relative to them. EFFECT: enhanced reliability. 2 dwg
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