The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 1978
Filed:
Feb. 07, 1977
Gerald C Fisher, Shelby, OH (US);
Joseph E Scanland, Savannah, GA (US);
Roper Corporation, Kankakee, IL (US);
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.