HOISTING DEVICE Russian patent published in 1995 - IPC

FIELD: hoisting equipment. SUBSTANCE: hoisting device is a three-dimensional extensible mechanism comprised of at least three structural members, each made of at least two folding grates on the pantograph type. Said grates in each row are arranged in intersecting planes forming a single articulated joint for fastening levers in each structural member. An operating mechanism in the form of a block-and-tackle changes the length of the extensible mechanism. For this purpose it comprises blocks articulated to the levers, and a flexible member running around said blocks. Reducing the length of said flexible member reduces the height of the extensible mechanism. Given are examples of reeving the flexible member and using additional operating mechanisms. EFFECT: improved design. 7 cl, 3 dwg