Mulching lawn mower

Details Mulching lawn mower Mulching lawn mower

1980-06-10

1982-03-09

Hafer, Robert A.

Harvesters

Cutting

Rotating-cutting-disk type

56295, A01D 5518

Patent

active

043182682

ABSTRACT:
A chuteless rotary scything mulching lawn mower is described which is particularly adapted to be powered by an electric motor including sealed motors. The cutting chamber includes a toroidal portion bounded by concentric skirt walls wherein the cross sectional area of the toroid increases towards the inner skirt. The inner skirt slopes downwardly towards the axis of the cutting blade, and terminates close thereto so as to reduce air leakage from the toroid. Air passage openings are provided into the housing on the axial side of the inner skirt through which cooling air is drawn for the motor. This air stream combines with air from the toroidal chamber which is redirected by the inner skirt wall to distribute grass cuttings over a comminuting portion of the blade. The blade is sharpened to a chisel edge along the upper surface thereof, the bevelled surface of the chisel edge functioning as an air propelling surface. The efficiency of the housing permits blades with less twist to be employed, reducing the incidence of blade cracking.

REFERENCES:
patent: 3085386 (1963-04-01), Slemmons
patent: 3790094 (1974-02-01), Spicer
patent: 3795095 (1974-03-01), Erkkson et al.
patent: 4087955 (1978-05-01), Szymanis
patent: 4134249 (1979-01-01), Wuerker et al.

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