STRUCTURE FOR WORKING UNIT FOR BUCKET EXCAVATORS AND METHOD FOR MANUFACTURING THE SAME

摘要

A bucket connecting bracket (23) is connected to one longitudinal end of a hollow arm body (22) having a triangular cross section, and a boom mounting bracket (26) is connected to the longitudinal middle part of the arm body (22), while an arm cylinder bracket (24) is connected to the other longitudinal end of the arm body (22) to constitute an arm. As a result, the arm body (22) is made resistant to deformation in cross section, so that its plate thickness can be reduced and its rigidity is enhanced without resort to a cross section bracing member, thereby manufacturing a light-weight arm free from cross-sectional deformation.