Patent ID: 7669667
Filing Date: 2010-03-02
Classification: A01B

Abstract:
1. An aerator for punching a plurality of holes in the ground, which comprises: (a) a frame supported for movement over the ground by a plurality of wheels; (b) a coring head carried on the frame, the coring head having a plurality of side-by-side tine assemblies that are vertically reciprocal for punching holes in the ground, the tine assemblies being vertically reciprocated by a plurality of drive arms with one drive arm reciprocating one tine assembly; (c) a drive member that is rotatable about an axis of rotation and serves as an input power source for reciprocating the drive arms up and down; and (d) a crankshaft for converting the rotation of the drive member to reciprocating motion of the drive arms up and down, wherein the crankshaft has a plurality of crank members that are separate from the drive arms with each crank member being connected to an upper end of one drive arm, and wherein the crankshaft comprises: