Cutter assembly for rotary lawn mower

Details Cutter assembly for rotary lawn mower Cutter assembly for rotary lawn mower

A - Human Necessities

01

D

56/48

A01D 34/416 (2006.01)

Patent

CA 1039512

ABSTRACT OF THE DISCLOSURE A cutter disc assembly for a rotary lawn mower in which the disc has a circular central portion and a peripheral portion with a shallow vertical wall in between penetrated by radial openings. A plastic pin is mounted cantilever-fashion in each opening. Each pin has a stiff shank protected by the disc and a stiffly resilient tip portion projecting beyond the periphery of the disc into cutting engagement with the grass. In the preferred embodiment the shank portion of the pin is protectively received in a groove. The groove has a rear wall against which the pin bends as the projecting tip of the pin strikes an obstruction as well as a front wall against which the pin bends upon rebound, the walls being curved in outwardly flaring shape thereby to support the shank of the bent pin substantially free of concentrated stress. Each groove has, in addition, a bridge or "ceiling" which serves as a guide surface to hold the pin in a downwardly-angled working position and to provide frictional damping. Protection of the tip portion of the pin in its bent state is offered by a ledge or radial extension on the disc either above or below the pin and which "wipes by" the obstruction, shielding the pin from abrading action. Upwardly swept radial vanes are provided above the periphery of the disc to generate air currents which agitate the grass as it is being cut and to provide a stream of air to move the clippings through the discharge chute.

260658

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