Importance

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Abstract

A road cutting machine comprises a machine body (2) mounted to a travelling body (1) to be swivel, a boom (4) mounted to the machine body to be vertically swingable, an arm (6) mounted to the boom to be swingable in a vertical direction and a road cutting apparatus (A) mounted to the arm, the road cutting apparatus includes a mounting member (20) attached to the arm, a hydraulic motor (50) mounted to the mounting member and a cutting bit mounting member (99) rotated by the hydraulic motor and having a plurality of cutting bits, the cutting bit mounting member is provided with a main cutting bit (100) mounted to a center of rotation, a plurality of flat surface cutting bits (103, 104) attached in a range from the rotation center side to an outer periphery side, a plurality of sweep-cutting bits (105) attached on the outer periphery side and a plurality of side surface cutting bits (106, 107) attached on the outer periphery side, a bit tip end portion (100a) of the main cutting bit is positioned in a lowermost position, bit tip end portions (105a) of the sweep-cutting bits are positioned above the bit tip end portion of the main cutting bit, bit tip end portions (103a, 104a) of the flat surface cutting bits are positioned above the tip end portions of the sweeping cutting bits, and bit tip end portions (106a, 107a) of the side surface cutting bits are positioned in a uppermost portions.

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First Claim