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US 2020/0282473 A1Published application
Four-edged drill
AssigneeGuehring KG
InventorPhilipp KUNZE
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AssigneeGuehring KG
InventorPhilipp KUNZE
Estimating the term…
The invention relates to a four-edged drill having two long main cutting edges, arranged in a point-symmetric manner with regard to the axis of rotation, which each extend from an outer circumferential cutting corner to a chisel edge in the middle of the drill tip, and two short main cutting edges, arranged in a point-symmetric manner with regard to the axis of rotation, which each extend from an outer circumferential cutting corner in the direction of the middle of the drill tip. According to the invention, each long main cutting edge has an outer partial cutting edge, extending from the cutting corner as far as a shoulder, and an inner partial cutting edge, extending from the shoulder as far as the chisel edge, said inner partial cutting edge having a greater cutting height (Δx) than the outer partial cutting edge and the short main cutting edges.
A four-edged drill, with two long main cutting edges arranged in a point symmetrical manner relative to an axis of rotation, which each extend from an outer circumferential cutting corner to a chisel edge in a middle of a drill tip, and two short main cutting edges arranged in a point symmetrical manner relative to the axis of rotation, which each extend from an outer circumferential cutting corner in the direction of the middle of the drill tip,
Dependencies are inferred from the claim text.