HOISTING DEVICE Russian patent published in 1995 - IPC

FIELD: hoisting machinery. SUBSTANCE: hoisting device is a three-dimensional structure each side of which has at least three rows of grates made of X-shaped interconnected levers and the ends of each lever are articulated with the like ends of levers on the adjacent side of the structure. The base of the structure is shaped like an equilateral polygon. The free ends of the levers in the lower row on each side are capable of moving over guides towards the center of polygon. The hoisting device folds like a pantograph due to a flexible tie running around the lever joints mounted in the zone and on the levers proper, beginning from the lower row and extending successively to the uppermost row. Various examples of reeving the blocks by the flexible tie are considered. EFFECT: improved design. 3 cl, 3 dwg