HOIST Russian patent published in 2005 - IPC

FIELD: lifting and transportation facilities.

SUBSTANCE: invention relates to large lifting capacity hoists and other devices operating with displacement of platforms. Proposed hoist contains platforms connected with screw interacting with drive located on platform through gear train, and roller nut. Nut consists of rings fastening racks arranged over circumference, with rollers mounted along helical line over length of rack. Axes of some rollers are square to axis of rack, and axes of other rollers are parallel to axis of rack. Axles of first rollers are made elastic and displacement symmetrically in turn relative to longitudinal axis of rack. Each platform contains support trolleys for contact with racks. Platforms are connected with screw through bearings by holding rings. Each ring is secured on corresponding inner bead of screw by fasteners.

EFFECT: improved reliability.

4 dwg