PROBLEM TO BE SOLVED: To provide a stopper for regulation of a hole depth used for a work for boring a hole, in which a spawn block and a forming bacteria for a raw wood is implanted in shiitake mushroom cultivation, by an electric drill, in which a drill is not rotated by a reaction due to biting of a gimlet, and a screw part to be fitted to the electric drill is not broken.SOLUTION: A body shape 2 of a stopper is so made as to be a frame shape of a frame over a rotation axis so as not to receive a biased load, thereby preventing breakage of a screw part. Further, a tip of the stopper is provided with a spring 3 which is moderately repelled from a force advancing by cutting of a gimlet 6 and a pressing hand force, and a contact face 10 of the stopper is so made as to be projected from the conventional whole circumferential surface and to have a spike effect, thereby preventing a drill 1 from rotation. The spring 3 causes the gimlet 6 to act in a drawn direction by a repulsive force of the spring 3 after the gimlet 6 advances to the stopper 2 and slips, and therefore, can achieve improvement of a work.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】椎茸栽培で原木への種駒や形成菌を植え込む穴を電気ドリルで明ける作業で用いられる穴深さ規制用ストッパーを、キリの食い込みによる反動でドリルが回されたり、電気ドリルへの固定用のネジ部分が破断することのないものとする。【解決手段】まずストッパーの本体形状2を、片よった荷重を受けないよう、回転軸にまたがるフレームの枠形状とすることにより前記ネジ部分の破断を防ぐ。また、ストッパーの先端に、キリ6の切削により前進する力と、押さえる手の力に適度に反発させたバネ3を具備させるとともに、ストッパーの当り面10を従来の全周面から、突起状としてスパイク効果を持たせることにより、前記ドリル1が回されることを防ぐ。このバネ3は、キリ6がスットッパー2まで前進し空転した後、バネ3の反発力によりキリ6を抜き取る方向へ作用させるので、作業の改善をはかることが出来る。【選択図】図1
