The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1981
Filed:
Mar. 26, 1979
Applicant:
Inventor:
Robert W Peters, Saegertown, PA (US);
Assignee:
Greenleaf Corporation, Saegertown, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23B / ;
U.S. Cl.
CPC ...
408186 ; 408705 ; 408713 ;
Abstract
A drill having at least two indexable radially spaced inserts arranged with axially projecting cutting points to machine overlapping concentric grooves, the outermost insert machining a groove having an outside diameter equal to the diameter of the hole and the innermost insert machining a groove overlapping the center of the hole, and radial components of the cutting thrust on said inserts being in opposition and balancing each other. The cutting thrust may be balanced by the number, shape and/or the rake of the cutting edges.