Patent ID: 7234535
Filing Date: 2007-06-26
Classification: A01B,Y10T

Abstract:
1. A turf drill comprising: a rotating body having an upper central bore and a lower central bore for receiving a shank of a turf drill bit, the upper central bore having an upper cylindrical bushing and a lower bushing having a generally conical recess and the lower central bore having a set screw for engaging the shank of a turf drill inserted in the lower central bore; at least one set screw in the rotating body having a generally cylindrical projection on one end thereof which projects into the upper central bore of the rotating body when the set screw is fully engaged in the rotating body; a generally cylindrical shaft having a first end adapted to connect to a turf aerator and an opposing second end sized to rotatably and slidably fit within the upper central bore of the rotating body, said second end having a generally conical end adapted to fit within the conical recess of the lower bushing of the rotating body and a stop collar for preventing withdrawal of the shaft from the upper central bore of the rotating body when a tensile force is applied to the shaft, the stop collar having an upper surface and a lower surface, said upper surface having at least one lateral depression sized and shaped to engage the generally cylindrical projection of the set screw in the rotating body when a tensile force is applied to the shaft and torque is applied to the rotating body sufficient to rotate the rotating body such that the set screw projection is in axial alignment with the lateral depression in the upper surface of the stop collar thereby preventing further rotation of the shaft in the upper central bore of the rotating body; and, a turf drill bit having a generally cylindrical upper portion and a spirally fluted lower portion said upper portion being held in the lower central bore of the rotating body by the set screw.