PROBLEM TO BE SOLVED: To discharge, to the outside, the mud riding over a closing member, which is installed between the upper parts of left and right side-plates, during the grooving.SOLUTION: The pair of left and right sorting bodies 10, 10 project from the upper surface of the closing member 5 symmetrically bilaterally. The pair of left and right sorting bodies 10, 10 are configured so that the sharp parts 11 are provided to the front part 2A side of a grooving device body 2 on the generally longitudinal center axis 7 of the closing member 5, and the flat surfaces are disposed in a generally reverse-V shape to provide the left and right sorting surfaces 12, 12 on the left and right sides. The interval A between the left and right sorting surfaces 12, 12 is gradually increased rearward. The mud riding over the closing member 5 is sorted to the left and right sides, and the sorted mud is gradually moved to the outside along the left and right sorting surfaces 12, 12 and discharged into the distance by the kinetic energy due to the movement.COPYRIGHT: (C)2011,JPO&INPIT【課題】溝切り時において左右側板の上部間に設けられた閉塞部材に乗り上げた泥土を外側に排出する。【解決手段】左右振り分け体10,10は閉塞部材5の上面上に左右一対を左右対称に突設する。これら左右一対の左右振り分け体10,10は先鋭部11を閉塞部材5のほぼ長手方向中心軸線7上の溝切り器本体2の前部2A側に設けると共に、平面を略逆V字状に配置してその左右に左右振り分け面12,12をそれぞれ設ける。左右振り分け面12,12の間隔Aを後方に向けて次第に幅大となるように形成する。閉塞部材5に乗り上げた泥土を左右に振り分け、その振り分けた泥土を左右振り分け面12,12に沿わせて次第に外側に移動させて、その移動に伴う運動エネルギーによってより遠くへ排出できる。【選択図】図1
