Patent · US Active

Drill bit including one piece cutting head

US7861807B2 · kind B2 · utility

12Cited by

79References

34Claims

0Family size

Assignee

BLACK & DECKER INC. · US

Inventors

Florian Probst · Freising, DE
Thomas J. Quinn · Los Gatos, US
William R. Stumpf · Kingsville, US
Albert Leidl · Passau, DE
Rudolf Jungwirth · Hutthurm, DE

Key dates

Filing date	Dec 3, 2008
Grant date	Jan 4, 2011
Priority date	—
Expiry date	Feb 20, 2029

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T408/9097
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A cutting head for a drill bit has a body with an overall cruciform shape. One pair of opposing arms defines a main cutting edge. The other pair of opposing arms defines an auxiliary edge. The main cutting edge is defined by rake surfaces and relief surfaces. Each rake surface and relief surface is defined by a plurality of facets. The main cutting edge includes a chisel edge. A first pair of planar rake facets, one on each end of said chisel edge, and a first pair of planar relief facets, adjacent said chisel edge, defines a portion of the cutting edge. A remaining portion of the main cutting edge is defined at the apex of a plurality of curved rake facets and curved relief facets. The auxiliary edge is defined by a plurality of curved surfaces.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.