MOVING COUNTERWEIGHT OF HOISTING EQUIPMENT Russian patent published in 2013 - IPC B66C23/72 

FIELD: transport.

SUBSTANCE: invention relates to hoisting equipment. Counterweight comprises two halves secured to one arm of L-like lever. Levers are arranged on sides of climbing crane rotary platform. Crane has two thrust blocks pivoted to appropriate monkey running on twin inclined riding beams to limit turn from minimum to maximum outreach. Monkey has supports directed downward and coupled with appropriate arm by tackles. Said tackles are connected with slack strand of gin block by triangular frame with rollers arranged at its apices Every half of counterweight represents a flat quadrangle with its longer side directed parallel with vertical line and is pivoted to appropriate arm of aforesaid lever with eccentricity relative to counterweight main axes.

EFFECT: increased capacity.

3 dwg