| 摘要 |
PURPOSE:To improve the structural rigidity and durability, and to increase the over-cutting amount, by installing the both ends of 80 over-cutter to the tips of two spoke cutters through a pin and a flexible jack respectively. CONSTITUTION:An over-cutter 2 which is a circular arc form of belt plate planting numerous cutter bits 21 on the surface is positioned between the tips of two spoke cutters 11, and its one end is installed rotatable through a pin, while the other end is installed through a flexible jack 23, to the tips of the spoke cutters 11 respectively. In this case, the both ends of the over-cutter 2 may be composed to connect through flexible jacks 23. And by holding plural over-cutters 2 solidly at two points respectively, their rigidity is improved, the expansion and contraction amount is increased to increase the over-cutting amount, and furthermore, the durability is increased and the reliability in a long distance construction work is improved. |
