| 摘要 |
A crumber for a trencher machine, the crumber comprising a crumber mount (12) for mounting to a crumber boom (11), and a crumber arm (14), the crumber arm (14) being mounted to the crumber mount (12) by a linkage, the linkage comprising a first linkage arm (20) and a second linkage arm (22), the linkage being arranged to allow rotation of at least one of the linkage arms of at least 75°. The crumber mount (12) has at least one edge or surface that is of complementary shape to an edge or surface of the crumber arm (14), wherein the least one edge or surface of the crumber mount and the complementary edge or surface of the crumber arm abut on each other when the crumber arm is in a lowermost position. In this manner, the crumber arm is supported along an extended length when in the lowermost position. |
