| 摘要 |
A trenching implement adapted for cutting a narrow trench in rock or frozen ground comprising a wheel which is mounted for rotation in a power trenching vehicle and which has a plurality of cutting bit holders spaced at equal intervals around its periphery with a cutting bit rotatably and removably mounted in each bit holder. The bit holders are mounted in such positions on the wheel as to hold all the cutting bits at the same positive rake angle, certain of the bit holders holding the respective cutting bits in the plane of the wheel, others holding the respective bits at skew angles with respect to the plane of the wheel with the respective bits extending out at one side of the wheel, and other holders holding their respective bits at skew angles with respect to the plane of the wheel with the respective bits extending out at the other side of the wheel.
|
