| 摘要 |
A tillage tool for forming an underground tunnel communicating with the surface by a narrow slot while effecting minimal surface tillage of the soil, the tool including a vertically extending shank plate having a lower edge joined to an elongated cylindrical mounting bar. A slotted forward cylindrical sleeve is demountably telescoped over the forward end of the mounting bar and receives the shank plate in a slot formed therein. The forward end of the cylindrical sleeve has a hardened wear plate secured thereto and positioned so that the wear plate lies in a plane extending at an acute angle to the longitudinal axis of the forward cylindrical sleeve. A rear cylindrical sleeve having a diameter equal to the forward cylindrical sleeve is demountably telescoped over the rear end of the mounting bar and has an end which abuts a rear end of the slotted forward cylindrical sleeve. A sharp edged slicer bar is detachably secured to the forward or leading edge of the shank plate.
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