| 摘要 |
The attachment between the tool blade (3) and the boom (1) is articulated, and is at a point ahead of the blade lower cutting edge (17). The blade can be pivoted backwards from the articulated union against the force of a spring unit. The boom (19 is connected via a vertical joint (59 to a horizontal cylinder part (4), which is rotatable relatively to a tool supporting body. To the cylinder part are connected hydraulic cylinders (16) for pivoting the boom and blade around the vertical joint. The cylinder part, by reason of its ability to rotate, permits the boom and blade to swing in relation to the body. |
