PROBLEM TO BE SOLVED: To provide a tilling device easily performing exchange operation of tillage tines, a mounting structure for the tillage tines, a tine holder and the tillage tines.SOLUTION: The tilling device 1 is equipped with a rotatably supported tillage shaft 10, tine holders 30 mounted on the tillage shaft 10 and each having a through-hole 31, tillage tines 20 each having an inserted part 21 to be inserted into the through-hole 31 on the base end side, bolts 41 and nuts 42 each for tightening the tine holder 30 onto the tillage tine 20. The tine holder 30 is mounted to the tillage shaft 10 in such a state that the through-hole 31 is directed in the peripheral direction of the tillage shaft 10 in the direction to intersect the shaft direction X at right angles and the through-hole 31 is formed in a tapered state that the width is reduced from one end side toward the other end side. The inserted part 21 is formed into a tapered state that the width is reduced along with the through-hole 31 toward the base end side and tightened onto the other end side of the tine holder 30 with the bolt 41 and nut 42.COPYRIGHT: (C)2008,JPO&INPIT【課題】耕耘爪の交換作業が容易な耕耘装置、耕耘爪の取付構造、爪ホルダー及び耕耘爪を提供する。【解決手段】耕耘装置1は、回転自在に支持された耕耘軸10と、耕耘軸10に取り付けられ、貫通孔31を有する爪ホルダー30と、貫通孔31に挿入される被挿入部21を基端側に有する耕耘爪20と、爪ホルダー30と耕耘爪20とを締結するボルト41及びナット42と、を備え、爪ホルダー30は、耕耘軸10の周方向であって軸方向Xと直交する方向に貫通孔31を向けた状態で耕耘軸10に取り付けられ、貫通孔31は、一端側から他端側に向かうほど縮幅するテーパ状に形成され、被挿入部21は、基端側に向かうほど貫通孔30に合わせて縮幅するテーパ状に形成されているとともに、ボルト41及びナット42によって爪ホルダー30の他端側に締結されている。【選択図】図2
