Patent ID: 9468144
Filing Date: 2016-10-18
CPC Classification: A01D

Claim Text:
1. A lawn mower comprising: a rotation shaft accommodated in a downwardly-opening housing and extending vertically in the housing; and a cutter blade accommodated in the housing and rotatably mounted on the rotation shaft, the cutter blade being an elongated flat plate shaped member extending in opposite horizontal directions with respect to the rotation shaft, the cutter blade having first and second surfaces facing in opposite axial directions of the rotation shaft and having two bent sections formed on respective ones of longitudinally opposite end portions thereof, the two bent sections being bent in opposite directions as viewed in the axial direction of the rotation shaft, the cutter blade having, on each of the bent sections, a convex cutter blade section formed along a convex edge of the bent section and a concave cutter blade section formed along a concave edge of the bent section, the convex and concave edges of each bent section converging toward one another with a portion of the convex edge defining a longitudinal end surface of the cutter blade, the convex cutter blade section on each of the bent sections having a cutting edge angle as measured from the second surface smaller than a cutting edge angle as measured from the first surface of the concave cutter blade section, the convex cutter blade sections and the concave cutter blade sections on the two bent sections are single-side blade sections oriented in opposite axial directions with respect to the rotation shaft.