BOOM STRUCTURE OF BACK HOE

摘要

PROBLEM TO BE SOLVED: To provide a boom structure of a back hoe capable of obtaining an installation attitude for reducing torsional stress in disposing a reinforcing wall in the internal space of a boom formed like a square tube. ;SOLUTION: A reference line X connecting one end part positioned on the boom base end side in a first bracket 7a for fitting a boom cylinder mounted at the base 7B of the boom 7 and the center R of curvature of a middle curved part 7A of the boom 7 is supposed, and a lower reinforcing wall 12 fixed at one end part to the base 7B is set in an attitude such that a flange part 12B approaching a ceiling surface 7D of the lower reinforcing wall 12 is inclined away from the reference line X at the base end side of the boom 7.;COPYRIGHT: (C)2003,JPO