Patent ID: 8221203
Filing Date: 2012-07-17
Classification: A01F

Abstract:
1. A knife blade of a rotor chopper assembly comprising: a body having an arrangement of openings, each opening of the arrangement of openings receives a retention device securing the body to a member that is rotatably connected about a first axis to a mounting lug of a chopper rotor, wherein at least one opening of the arrangement of openings includes a recess formed in the knife blade that extends along a radial distance from the at least one opening and the first axis, the first axis being substantially parallel to the axis of rotation of the chopper rotor; the body is centrifugally urged radially outward from the mounting lug about the first axis, wherein the retention device and the first axis defining a second axis; wherein if the body strikes an obstruction during operation of the rotor chopper assembly, the body is urged to rotate about the first axis until the retention device abuts a stop formed in the mounting lug, the retention device and the first axis defining a third axis; wherein an angle subtended between the second axis and the third axis is different for at least two openings of the arrangement of openings formed in the body.