| 摘要 |
PURPOSE:To expand the operational range of a boom by a method in which a bracket and a lug are attached to the center of the boom, a piece is attached with pins across the bracket and the lug, and one end of the boom cylinder is pivotally attached to the middle part of the piece. CONSTITUTION:A bracket 13 and a lug 14 are attached at an interval at the central part of a boom 3, and a triangular piece 12 is attached with pins across the bracket 13 and the lug 14. One end of the boom cylinder 2 is pivotally attached to the middle part 16 between the bracket 13 and the lug 14. Since the fitting positions of the boom 3 and the boom cylinder 2 can be lowered by the piece 12, the boom 3 can be greatly risen and the operational range of the boom 3 can thus be expanded by the part of the oblique line B1 as compared with the conventional cases. |
