| CPC A01D 34/826 (2013.01) [A01D 34/73 (2013.01); A01D 34/78 (2013.01); A01D 2101/00 (2013.01)] | 20 Claims |
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1. An electric lawnmower comprising:
a drive unit; and
a mowing unit coupled to the drive unit and comprising a set of cutting blade units and a discharge conduit, mechanically attached to the set of cutting blade units, wherein:
each of the set of cutting blade units comprises a blade enclosure and a cutting blade defining a blade center axis,
the cutting blade comprises a hub and a set of cutting extensions, each connected to the hub,
the set of cutting extensions comprises at least five cutting extensions evenly spaced about the blade center axis,
each cutting extension in the set of cutting extensions comprises a cutting edge having a curved shape,
the cutting blade is associated with a circular boundary, having a perimeter,
each of the set of cutting extensions comprises a circumferential edge, having a length and extending along the perimeter of the circular boundary from the cutting edge,
a sum of the length of the circumferential edge of all cutting extensions in the set of cutting extensions is at least 50% of the perimeter of the circular boundary,
the cutting blade comprises a cutting portion and a lifting portion such that the cutting edge is a part of the cutting portion,
the lifting portion is directly connected to the cutting portion,
both the cutting portion and the lifting portion protrude away from a plane defined by the cutting edge of the cutting blade of all cutting blade units in the set of cutting blade units, and
the cutting portion and the lifting portion form a continuous curve having a variable curvature radius.
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