| 摘要 |
An improved rotary lawn mower utilizing a novel cutting apparatus for increased safety. The cutting apparatus comprises a cutting wheel disposed within a blade cover, a protective housing releasably suspended by the blade cover beneath the cutting wheel, and a fan incorporated into the cutting wheel for drawing grass upwardly through slots in the protective housing and discharging the grass cuttings. The cutting wheel comprises a central hub for attachment to the drive shaft of the lawn mower engine, a plurality of radially-extending, horizontally-oriented rotary cutting blades, and a peripheral rim. A radial-flow fan is formed by the rim, and the cutting blades form an axial-flow fan, both of which produce an air flow which draws grass through the slots and discharges the cuttings through a discharge port of the blade cover. The cutting blades and the edges of the slots in the bottom of the wheel housing cooperate with a scissors-like shearing action to cut grass which is drawn up through the slots by the air flow. Blades and openings in the rim which form the radial-flow fan also serve to mulch the grass clippings before they are discharged. Annular skids welded to the bottom of the wheel housing provide a minimum spacing between the cutting blades and the ground and reinforces the wheel housing.
|
