| 摘要 |
<p>A rotary mulching lawn mower (10), preferably driven by a battery powered electric motor (16), is provided having an annular housing (12) forming a toroidal internal cutting chamber (64) in which is oriented a blade (14) having a central axis for rotation. The blade has a series of blade portions extending radially outward from the central axis each having an end portion (32) extending into the toroidal internal cutting chamber. The blade end portion directs cut grass upward into the cutting chamber. Each blade has an intermediate portion (34) located between the central axis and the end portion having a substantially flat surface lying in a plane generally perpendicular to the axis of rotation. The intermediate portion is provided with a radially extending rib (44) located intermediate the leading (46) and trailing edge (48) portions of the blade having a slope projecting downwardly out of the plane for directing cut grass into the lawn upon rotation of the blade.</p> |
