PORTAL TOWER CRANE Russian patent published in 2009 - IPC B66C23/34 

FIELD: construction equipment.

SUBSTANCE: proposed crane comprises portal with its lengthwise beams hinged to the crane walking frame, portal support frame accommodating support circle, crane tower with boom, braces and boom head coupled therewith. One side of every lengthwise beam accommodates a pair of Λ-like struts, comprising inner and outer supports tilted towards each other. The upper parts of aforesaid supports are interconnected at the location of hinge jointing Λ-like strut to support frame. Lower end of every outer support is hinged to portal lengthwise beam. Aforesaid boom head is furnished with double-arm rocker hinged to its top, one arm being hinged to the boom anchor rope, the other one being pivot-jointed to the brace anchor rope. Hinges attaching anchor ropes to aforesaid rocker are located above that attaching the said rocker to anchor rope.

EFFECT: simpler design, higher reliability and ease of installation.

5 dwg