Mowing and mulching blade and its positioning in a lawn mower

摘要

The blade has an outer cutting section with 3 guide surfaces inclined to the cutting plane, the first (9) at about 5 degrees over about 1/3 of the blade width, the second (10) at about 30 to 40 degrees and pressed out to about 1/2 the outer cutting section and the third (11) towards the back of the blade approximately parallel to the cutting plane but only pressed out to about 1/3 the radial extent of the outer cutting section and a continuous smooth guide surface (14) between the 3 guide surfaces and a curved cutting section (6).