Patent · US Active

Metal cutting drill bit

US8740515B2 · kind B2 · utility

11Cited by

18References

11Claims

0Family size

Assignee

BLACK & DECKER INC. · US

Inventors

Rickey J. Thomas · Lineboro, US
Florian Probst · Freising, DE
Thomas J. Quinn · Los Gatos, US
Abhijeet P. Joshi · Baltimore, US
Alfons K. Wetzl · Passau, DE
Albert Leidl · Passau, DE
David N. Johnson · Crook, GB

Key dates

Filing date	Aug 12, 2009
Grant date	Jun 3, 2014
Priority date	—
Expiry date	Nov 1, 2032

Classification

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

Abstract

A combination drill bit for use in both hand held drills and stationary drill presses has a shanking end, a working end and a helical flute portion between the shanking and working ends. The helical portion has a helix length (L) ofThe drill bit has a core that is tapered from the working end to the shanking end. A web thickness length at the working end is 10% to 35% of the diameter and the thickness length at the junction of the shanking end is 70% to 90% of the diameter. The drill bit is manufactured from a high speed steel including at least 5% by weight of cobalt.

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