PROBLEM TO BE SOLVED: To simply prevent erroneous operation due to an impact in a direction of turning operation in comparison with the case that a guard body and the like are provided in a work vehicle, and also to eliminate a complicated structure of the work vehicle and troublesome operation which a worker is forced to do.SOLUTION: A key cover 19 of a key 18 which is inserted into a key switch 17 of a sulky rice transplanter 1 and is operated by turning includes: a fitting-in part 19a into which a knob part 18b of the key 18 is fitted and a covering part 19b which covers the knob part 18b fitted in the fitting-in part 19a. An outer peripheral surface of the covering part 19b has a semi-spherical shape so that, when it receives an impact in a direction of turning operation of the key 18, the impact is released in the other direction.COPYRIGHT: (C)2014,JPO&INPIT【課題】回し操作方向の衝撃による誤操作を防止するにあたり、作業車両にガード体などを設ける場合に比べ、簡易に実施できるだけでなく、作業車両の構造を複雑にしたり、作業者に面倒な操作を強いることも回避する。【解決手段】乗用田植機1のキースイッチ17に挿入して回し操作される鍵18の鍵カバー19であって、鍵18の摘み部18bが嵌入される嵌入部19aと、嵌入部19aに嵌入された摘み部18bを覆う覆い部19bとを備え、覆い部19bの外周面が、鍵18の回し操作方向の衝撃を受けたとき、該衝撃を他方向に逃がす半球形状を有する。【選択図】図6
