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US 8,757,295 B2Granted
Method of planting a seed, plant, bush or tree, and a drill
AssigneeHolding P.M.M. Hoff B.V.
InventorPetrus Mattheus Maria Hoff
Life of this patent
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AssigneeHolding P.M.M. Hoff B.V.
InventorPetrus Mattheus Maria Hoff
Estimating the term…
The invention relates to a drill for realizing a partially tapered bore hole in a soil covering a hardpan layer. The drill comprises a rotatable drivable unit that is provided with a carrying structure and a multiple number of cutting elements carried by the carrying structure. The multiple number of cutting elements are arranged along a line extending substantially radially and outwardly from a central axis of the rotatable drivable unit. Further, lower ends of cutting elements in a radial inner section are mainly positioned in a plane transversely to the rotation axis of the rotatable drivable unit. Lower ends of cutting elements in a radial outer section are mainly positioned in a downwardly tapered surface having a symmetry axis coinciding with the rotation axis of the rotatable drivable unit. The lower ends of the cutting elements may subscribe, during rotation, a truncated cone surface.
A drill for realizing a partially tapered bore hole in a soil covering a hardpan layer, comprising a rotatable drivable unit that is provided with a carrying structure and a multiple number of cutting elements carried by the carrying structure, the multiple number of cutting elements being arranged along a line extending substantially radially and outwardly from a central axis of the rotatable drivable unit, wherein lower ends of cutting elements in a radial inner section are mainly positioned in a plane substantially transversely to the rotation axis of the rotatable drivable unit, while lower ends of cutting elements in a radial outer section are mainly positioned in a downwardly tapered surface having a symmetry axis coinciding with the rotation axis of the rotatable drivable unit, the radial outer section defining a relatively large area relative to the area defined by the radial inner section.
A drill for realizing a partially tapered bore hole in a soil covering a hardpan layer, comprising a rotatable drivable unit that is provided with a carrying structure and a multiple number of cutting elements carried by the carrying structure, the multiple number of cutting elements being arranged along a line extending substantially radially and outwardly from a central axis of the rotatable drivable unit, wherein lower ends of cutting elements in a radial inner section are positioned in a plane substantially transversely to the rotation axis of the rotatable drivable unit, while lower ends of cutting elements in a radial outer section are mainly positioned in a downwardly tapered surface having a symmetry axis coinciding with the rotation axis of the rotatable drivable unit, wherein the carrying structure includes a truncated cone surface.
Dependencies are inferred from the claim text.