Patent ID: 6041869
Filing Date: 2000-03-28
Classification: A01B

Abstract:
In an aerator for use in forming holes in turf and having a ground-mobile structure for movement over the ground in an aerating operational direction, a crank mechanism rotatably mounted on said structure, a power source connected to said crank mechanism for rotating the latter, an assembly of vertical orientation of ground-penetrating tines and a tine support and with said tines being movable into and out of the ground, and a crank arm pivotally connected between said crank mechanism and said assembly for up-and-down and fore-and-aft movements of said assembly in an upright plane extending in the operational direction and upon rotation of said crank mechanism, the improvement comprising:two sets; each set consisting of said crank mechanism and said crank arm wherein said crank mechanism and said crank arm are both in duplicate in each set and wherein said crank arms are parallel to each other in each set and are spaced apart in said upright plane extending in said operating direction and are connected and disposed relative to both said assembly and said crank mechanism and form a parallelogram with said assembly and said crank mechanism in each set and thereby maintain the vertical orientation of said tines throughout their entire movement into and out of the ground, anda link pivotally connected between said structure and one of said crank arms for limiting the fore-and-aft movement of said crank arms.