LIFTING DEVICE Russian patent published in 1995 - IPC

FIELD: hoisting and lifting mechanical engineering. SUBSTANCE: lifting device represents a spatial structure formed by sides having in its base an equilateral polygon and made at least of three rows of lattices formed by X-shaped hinged levers. The ends of the levers in each row of one side are hinged with similar ends of levers of the lattice of the same row of the adjoining side. In this case the lever ends of the lower lattice are mounted in the guideways of the base for displacement to the polygon center if the device length increases. In order to change the device length, a drive in the form of a compound pulley is envisaged. The flexible member of the drive is takle block in succession in height through the blocks disposed in planes at an angle to the longitudinal axle of the lifting device. EFFECT: facilitated manufacture. 1 cl, 2 dwg