| 摘要 |
PURPOSE:To enhance the strength and appearance of a boom and an arm by a method in which the boom and the arm are both formed of a hollow cylinder and a boom cylinder, an arm cylinder, and a working cylinder are housed in the boom and the arm. CONSTITUTION:A boom 4 is provided to the support bracket of a vehicular body in a rising and falling manner, and an arm 5 is provided to the boom 4 in a rocking manner. A working machine 3 is held by the arm 5. A boom cylinder 23 by which the boom 4 is allowed to make a rising and falling movement is housed in the boom 4 made of a hollow cylinder, and a working cylinder 31 by which the working machine 3 is allowed to operate is housed in the arm 5 made of a hollow cylinder. Also, an arm cylinder 27 by which the arm 5 is allowed to make a rocking action is housed in the boom 4. The strength of the boom 4 and the arm 5 can thus be increased and the appearance of them can also be raised. |
