PROBLEM TO BE SOLVED: To provide an farm implement attached to a tractor, having two construction parts turning relative to each other and having a compact locking mechanism to lock the turning.SOLUTION: One construction part 50 of the work vehicle has a contact member 51, the other construction part 20 has a first receiving member 61, a second receiving member 62 and a locking member 42 placed between the first receiving member 61 and the second receiving member 62. The locking member 42 is switchable between a passable position and an interfering position to the contact member 51 by relative turning of the former construction part 50, and the locking of the turning of two construction parts 50, 20 is performed at a first locking state to place the contact member 51 between the first receiving member 61 and a side end 42a of the first receiving member 61 of the locking member 42 at the interfering position, and a second locking state to position the contact member between the second receiving member 62 and a side end 42b of the second receiving member 62 of the locking member 42 at the interfering position.COPYRIGHT: (C)2010,JPO&INPIT【課題】相対的に互いに回動する2つの構成部を有する場合に、この回動をロックするロック機構がコンパクトとなるトラクタに装着する農作業機を提供することを目的とする。【解決手段】一方の構成部50は、当て部材51を有し、他方の構成部20は、第1の受け部材61と、第2の受け部材62と、第1の受け部材61と第2の受け部材62の間に配設されたロック体42とを有し、ロック体42は、一方の構成部50の相対的な回動による当て部材51に対して通過可能位置と干渉位置とに変更可能であり、2つの構成部50、20の回動のロックは、当て部材51が、第1の受け部材61と干渉位置におけるロック体42の第1の受け部材61側端部42aとの間に挟まれる第1のロック状態と、第2の受け部材62と干渉位置におけるロック体42の第2の受け部材62側端部42bとの間に挟まれる第2のロック状態とでなされる。【選択図】図4
