Patent ID: 6829878
Filing Date: 2004-12-14
Classification: A01D

Abstract:
A disc cutterhead for a rotary mower, said cutterhead comprising:a low-profile generally bowl-shaped generally symmetrical cover with an upper generally convex side, an opposing generally concave underside and a peripheral edge; a plurality of quick change knife attachment systems generally symmetrically located around said peripheral edge, each said knife attachment system including: an elongate spring plate having a longitudinal axis and a transverse axis perpendicular to said longitudinal axis, a first end portion and an opposing second end portion with a middle portion therebetween, all three portions aligned along said longitudinal axis, and said middle portion having a curvilinear longitudinal side profile with bends therein, said first end portion rigidly affixed to said concave underside of said cover; a cylindrical knife pin affixed to said concave underside of said cover adjacent said peripheral edge and depending therefrom; an elongate knife with a first end and an opposing second end, said first end including a cutting edge and said second end having a hole therethrough with a diameter slightly larger than the diameter of said cylindrical knife pin; said second end portion of said spring plate having a hole therethrough with a diameter slightly larger than the diameter of said cylindrical knife pin; said bends in said middle portion of said spring plate being such that, with said hole in said knife fitted onto said knife pin and said knife pin extending into and through said hole in said second end portion of said spring plate, said second end portion of said spring plate is biased toward said underside of said cover, whereby said knife is held in operating position.