| 摘要 |
PURPOSE:To make easier boring work for the ground below buildings or obstructions by making the second boom to support a bucket freely turnable in relation to the first boom. CONSTITUTION:A vehicle consists of a body 1, the first boom B1 pivotally supported on the first cross shaft A1, an outer cylinder 3 pivotally supported on the second cross shaft A2 at the tip of the first boom B1, the second boom B2 whose cylindrical base 4 is rotatably fitted into the outer cylinder 3, and a bucket 5 pivotally supported on the third cross shaft A3 at the tip of the second boom, together with oil-pressure cylinders C1, C2, and C3. When boring the ground below an abstruction, an oil-pressure motor built in the outer cylinder 3 is turned to turn the second boom B2 toward the outer cylinder 3, and the oil-pressure cylinders C1-C3 are actuated for boring. Furthermore, boring work is continued while turning the second boom B2 to 360 deg. as needed. |
