UNDERGROUND EXCAVATOR

摘要

An underground excavator includes a rotary cutter (12) mounted to the forward end of a rotary shaft (13), the latter being mounted for axial rotation and simultaneous rocking in the axial direction. The cutter is provided with a conical cutter face plate (21) having holes (24) for passing therethrough the excavated material and diametered smaller than an opening of excavated-material discharging means (25) disposed in a chamber (16). Thus material of a size larger than the holes (24) is moved quickly along the conical cutter face plate toward the peripheral ground layer by the rocking motion of the conical cutter face plate simultaneously with the rotation of the cutter during advancement of the excavator.