HOIST Russian patent published in 2006 - IPC B66B9/02 

FIELD: mechanical engineering: lifting and transporting facilities.

SUBSTANCE: proposed hoist contains screw coupled with load platforms engaging through trains with drives arranged on load platforms, and nut made in form of cylinder. Guides made on inner surface of cylinder are uniformly spaced over circumference and are provided with contact path in form of obtuse angle. Support trolleys with travel motion mechanisms with support rollers are secured on load platforms. Shape of support rollers corresponds to shape of path of guide. Springs with adjusting gaskets are installed in bodies of support trolleys between travel motion mechanisms and walls of trolleys.

EFFECT: improved reliability of hoist.

4 dwg