ATTACHMENT FOR CHIPPING U-SHAPED GUTTER

摘要

PROBLEM TO BE SOLVED: To prevent ruptured fragments from scattering around without excessive rupture during the rupture of an upper part of a U-shaped gutter block made of concrete. SOLUTION: In an attachment equipped with a machine base frame, a mounting bracket having a mounting hole is provided swingably in a horizontal direction in a rear part on the machine base frame. The attachment is provided with two press-enlarged members which are pivoted on a front part of the machine base frame and equipped with a plurality of bits outside, and a hydraulic cylinder is mounted at rear ends of the press-enlarged members. The two press-enlarge members can be pressed for enlargement by extending the hydraulic cylinder, to which pressure oil is fed from a standby hydraulic pressure source take-out opening of a shovel type excavation working machine and a hydraulic pressure source such as a simple type one provided separately at a job site.