PROBLEM TO BE SOLVED: To provide a lawn protection material which includes an upper frame and a lower frame, and is an engagement means engaged again by tread pressure when the engagement is unfastened.SOLUTION: The lawn protection material includes the lower frame laid on a base plate, and an upper frame engaged with the lower frame. The lower frame and the upper frame are formed each into a net state, the intersecting points of the nets fit in each other when vertically engaged with each other, an upwardly projecting bar is set at the intersecting point of the upper frame, a cover piece is set at the top of the bar, the intersecting point of the upper frame is formed into a ring shape, an upwardly rising cylinder is set at the periphery of the ring, an edge piece toward the center of the cylinder from the inner wall of the cylinder from the center of the cylinder, and the cover piece is inserted into the ring and extended on the edge piece so as to engage the lower frame and the upper frame with each other. A tongue piece getting down by tread pressure is set on the upper part of the engagement part so as to be engaged again when the upper and lower engagement parts are uncoupled.COPYRIGHT: (C)2010,JPO&INPIT【課題】本発明は、上部枠と下部枠からなる芝生保護材で係合が外れた場合再度踏み圧により再係合する係合手段の提案である。【解決手段】本発明は、基盤上に敷設される下部枠と下部枠上に係合される上部枠からなる芝生保護材にあって、下部枠と上部枠は共に網目状とされ、互いに上下に係合されるときその網目の交点が一致し、下部枠の交点には上方に突出する棒が設けられ、その上端部に笠片が設けられ、上枠部の交点は輪とされ、当該輪の周囲には上方に立ち上がる筒部が設けられ、当該筒部の中間から筒内壁から筒中心に向かう縁片が設けられ、前記笠片が前記輪に挿入され、縁片上で広がることで下部枠と上部枠が係合した芝生保護材である。上下の係合部分が外れた場合踏み圧で際係合されるよう、係合部の上部に踏み圧により下方に下がる舌片を設けた。【選択図】図3
