Mower blade

A mower blade, comprising:

• a blade main body having a length-direction and opposite first and second cutting ends;
• each of the first and second ends comprising:
• an air circulator portion arranged opposite a cutting portion;
• the cutting portion being arranged in a length-direction end portion of the blade main body and extending along a predetermined area in the length-direction;
• and
• a boundary line defined by where the air circulator portion meets a surface of the blade main body extends along the length-direction and at an angle,
• wherein a distance between the boundary line at an outer end of the blade main body and a tip of the cutting portion is less than a distance between the boundary line and the cutting portion at a position spaced from the outer end, and
• wherein a height of an upper end portion of the air circulator portion, measured from the surface of the blade main body, is a substantially constant height over a predetermined length.

A mower blade, comprising:

• a blade main body a centrally disposed mounting hole, a length-direction and oppositely arranged first and second cutting ends;
• each of the first and second ends comprising:
• an air circulator portion arranged opposite a cutting portion;
• and
• a boundary line defined by where the air circulator portion meets a surface of the blade main body extends along the length-direction and at an angle that is not parallel to an imaginary centerline of the blade main body passing through a center of the mounting hole and extending along the length-direction,
• wherein the distance between a first portion of the boundary line and the imaginary center line changes continuously by a first amount and the distance between a second portion of the boundary line and the imaginary center line changes continuously by a second different amount.