TOWER CRANE LOAD-LIFTING BOOM MEMBER Russian patent published in 2003 - IPC

FIELD: load-lifting facilities. SUBSTANCE: invention relates to design of tower load-lifting cranes, particularly, to lattice members of load-lifting boom. Proposed member of load-lifting boom contains longitudinal load-bearing bars forming flat sides of member and parts coupling said load-bearing bars on each of said sides to form lattice. Said lattice parts are formed by modules, each made of cut out or out and bent metal sheet. Each said module contains two or three straight-line sections 10, 11, 10, 11, 19 connected to each other to form one corner zone 12. Each module can contains more than two straight-line sections connected to each other to form several corner zones. Said modules are made for connection by free ends of straight-line sections 10, 11, 10, 11, 19 and one or several corners zones 12 to longitudinal load-bearing bars, for instance, by welding. EFFECT: simple design, reduced weight of member at preservation of its mechanical characteristics. 8 cl, 9 dwg