Patent ID: 7472759

Claim:
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; and (c) a linkage for connecting each drive arm to the coring head, the linkage comprising a pivotal connecting link connected at a first end to the drive arm and at a second end to a first end of a biasing link, the biasing link having a second end resiliently and pivotally connected to the coring head, the first end of the connecting link connecting to the drive arm on one side of the drive arm and the tine assembly, the connecting link then extending across the drive arm so that the second end of the connecting link connects to the biasing link on an opposite side of the drive arm and the tine assembly to decrease front to back depth of the coring head.