| 摘要 |
A powered lawn mower adapted to slice grass into small pieces and to disperse these pieces on the lawn to provide a mulch therefor to enrich the soil without impairing the appearance of the lawn. The mower includes a multi-bladed, multi-level rotor having a central hub which is driven to rotate about a vertical axis. Three sets of blades radiate from the hub in staggered relation, the first set being at the level of the hub and having the longest blade length. The second set is a step below the hub and has an intermediate blade length, and the third set is a step below the second and has the shortest blade length. The leading edges of the blades are pitched to create an air foil effect producing an updraft to raise the grass and thereby facilitate a cutting action. As the mower is advanced in a horizontal path toward unmown grass, first the upper portions of the grass blades are sliced by the rotating long blades of the first set, then the intermediate portions of the grass blades are sliced by the shorter rotating blades of the second set, and finally the stubble portions of the grass blades are sliced by the still shorter rotating blades of the third set.
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