| 摘要 |
PURPOSE:To keep the cutting depth of a cutter ring at a fixed depth even when the depth of a culvert is changed by using a parallel link mechanism consisting of a subsoiler frame, a cutter ring supoort lever, a tail ring support lever, and a connection lever. CONSTITUTION:A subsoiler 1 is pivotally attached to a hanger device 9 consisting of a lower link 5 and a top link 7, provided to an agricultural tractor 3, etc. A parallel link mechanism 56 consists of a subsoiler frame 15, a cutter ring support lever 27, a tail ring support lever 33, and a connection lever 53. A culvert is formed by an excavator 21 and a bullet 23. The parallel link mechanism 59 is operated by turning a handle 43, the tail ring 35 is vertically moved, and the cutter ring 29 is also vertically moved in the wake of the tail ring 35. Thus, even when the tail ring 35 is vertically adjusted to alter the depth of the culvert, the cutting depth of the cutter ring 29 can be kept constant. |
