Safe cutter disc assembly for rotary lawn mower

Details Safe cutter disc assembly for rotary lawn mower Safe cutter disc assembly for rotary lawn mower

1977-02-07

1978-01-03

Kinsey, Russell R.

Harvesters

Cutting

Cutter members

A01D 5518

Patent

active

040659135

ABSTRACT:
A safe cutter disc assembly for a rotary lawn mower in which the disc has a circular central portion and an annular outer portion joined by a shallow vertically extending wall having a plurality of radially extending openings. The cutting elements are in the form of cutter pins inserted in the openings, each pin in the preferred embodiment being formed of durable plastic having a head, a relatively stiff shank and a long tapering flexible tip portion, the pins being supported cantilever fashion with respect to the openings. The annular outer portion of the disc closely underlies and protects the relatively stiff shank portions of the pins while the tips of the pins project beyond the periphery of the disc into engagement with the grass, bending back into the projection of the outer portion of the disc upon striking of an obstruction. Adjacent each of the openings is provided a backstop in the form of an upstanding radial vane having a retreating curvature for engaging and providing lengthwise-distributed support for the associated pin during its backward bend. In an alternate version a pin having shank and tip portions of substantially equal diameter is used.

REFERENCES:
patent: 197825 (1877-12-01), Campbell
patent: 816486 (1906-03-01), Long
patent: 2557598 (1951-06-01), Daggett
patent: 2888993 (1959-06-01), Dunning
patent: 3018602 (1962-01-01), Diesterweg
patent: 3104510 (1963-09-01), Voigt
patent: 3176455 (1965-04-01), Buchanan
patent: 3320732 (1967-05-01), Kirk
patent: 3474608 (1969-10-01), Frick
patent: 3826068 (1974-07-01), Ballas et al.
patent: 3900071 (1975-08-01), Crawford

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