The present invention relates to a grass mower comprising a handle with a predetermined length a driving part installed in an end domain of the handle a rotary shaft constructed at a predetermined length a cutting member installed on the rotary shaft a support holder fastened to the rotary shaft in a lower part of the cutting member a safety cover positioned in a lower domain of the cutting member and supported by the handle as a support member a bearing prepared at the center of the safety cover a bearing cover to protect the fastening bolts installed at the center of the bearing multiple vent holes formed by penetrating the surface along a circumferential direction of the surface at a given gap with an arbor hole formed at the center of the safety cover and a fan installed between the cutting member installed on the rotary shaft and the safety cover with the central domain supported in the upper domain of the bearing to generate strong air towards one side by rotating along with the rotary shaft. According to the said invention, there is an advantage for loads of the safety cover in contact with the ground are reduced to lower the weight of a grass mower by allowing levitation of the safety cover at a given height above the ground through the installment of a fan between the cutting member and the safety cover installed in a lower domain of the cutting member to protect the cutting member so as to facilitate the use as well as preventing users accidents caused by rocks, etc which are lying on the ground by maintaining a constant gap between the safety gap and the ground.COPYRIGHT KIPO 2014본 발명은, 일정한 길이를 갖는 손잡이와, 상기 손잡이의 단부 영역에 설치된 구동부와, 상기 구동부로부터 하측을 향하여 일정한 길이로 축설된 회전축과, 상기 회전축에 설치된 절단부재와, 상기 절단부재 하부 회전축에 체결된 지지홀더와, 상기 절단부재의 하부 영역에 위치되어 지지부재로서 상기 손잡이에 지지된 안전커버와, 상기 안전커버 중앙에 마련된 베어링과, 상기 베어링의 중앙에 설치된 체결볼트와 상기 베어링을 보호하는 베어링커버로 이루어진 예초기에 있어서, 상기 안전커버 중앙에 형성된 축공과 일정한 간격을 둔 표면의 둘레 방향을 따라 상기 표면을 관통하여 다수 형성된 통기공과 상기 회전축에 설치된 절단부재와 중앙 영역이 상기 베어링의 상부 영역에 지지된 안전커버 사이에 설치되어
