Michael D Shultz

US Patent:

7832966, Nov 16, 2010

Filed:

Nov 28, 2006

Appl. No.:

11/564112

Inventors:

Michael D. Shultz - Bradenville PA, US
Stephen M. George - Evans GA, US
Raymond E. Moring - Martinez GA, US
David L. Ford - Bentonville AR, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

B23B 51/02

US Classification:

408224, 761086, 451 48, 408230, 408225

Abstract:

The present invention is directed to a helical drill configuration that allows substantially flat bottomed holes to be machined. At the cutting end of the body member, there are at least two cutting edges that are symmetrically oriented on opposing sides of the rotational axis of the drill. In an embodiment of the invention, first and second cutting edge portions form a continuous surface which provides strength and tool stability. The height of the second portions of each of the cutting edges remains relatively consistent along the horizontal for formation of a generally flat bottom hole. In the embodiment, a center point is defined by two sloped peak surfaces. A central straight chisel edge is formed by the intersection of the two sloped peak surfaces. The first cutting edge section extends from the chisel edge to the second cutting edge section. The first cutting edge section for both cutting edges is formed by symmetrically thinning the two peak surface.

US Patent:

7832967, Nov 16, 2010

Filed:

Mar 13, 2008

Appl. No.:

12/047904

Inventors:

Bernhard Borschert - Bamberg, DE
Dieter Mühlfriedel - Ebermannstadt, DE
Jürgen Schwägerl - Vohenstrauss, DE
Ruy Frota De Souza - Latrobe PA, US
Michael D. Shultz - Derry PA, US
Michael R. McCormick - Greensburg PA, US
Robert A. Erickson - Raleigh NC, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

B23B 51/02

US Classification:

408231, 408227, 408713

Abstract:

A rotary cutting tool that is composed of a tool shank with at least one chucking groove or chip flute and one exchangeable cutting insert. At the tip of the shank a recess for accommodating the cutting insert is provided. The tool shank, on its circumference, has a limb with a bearing surface that is inclined relative to the tool axis and that corresponds to a likewise inclined bearing surface on a wing of the cutting insert. The inclination of the bearing surfaces produces an axial force that retains the cutting insert on the tool shank. The abstract of the disclosure is submitted herewith as required by 37 C. F. R. 1. 72(b). As stated in 37 C. F. R. 1. 72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure. ” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims.

US Patent:

8366358, Feb 5, 2013

Filed:

Jul 30, 2010

Appl. No.:

12/847216

Inventors:

Bernhard Borschert - Bamberg, DE
Dieter Mühlfriedel - Ebermannstadt, DE
Jürgen Schwägerl - Vohenstrauss, DE
Ruy Frota De Souza, Jr. - Latrobe PA, US
Michael D. Shultz - Derry PA, US
Michael R. McCormick - Greensburg PA, US
Robert A. Erickson - Raleigh NC, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

B23B 51/02

US Classification:

408231, 408226, 408230, 408713

Abstract:

A rotary cutting tool that is composed of a tool shank with at least one chucking groove or chip flute and one exchangeable cutting insert. At the tip of the shank a recess for accommodating the cutting insert is provided. The tool shank, on its circumference, has a limb with a bearing surface that is inclined relative to the tool axis and that corresponds to a likewise inclined bearing surface on a wing of the cutting insert. The inclination of the bearing surfaces produces an axial force that retains the cutting insert on the tool shank.

US Patent:

7360974, Apr 22, 2008

Filed:

Aug 19, 2004

Appl. No.:

10/921781

Inventors:

Bernhard Borschert - Bamberg, DE
Dieter Mühlfriedel - Ebermannstadt, DE
Jürgen Schwägerl - Vohenstrauss, DE
Ruy Filho Frota De Souza - Latrobe PA, US
Michael D. Shultz - Derry PA, US
Michael R. McCormick - Greensburg PA, US
Robert A. Erickson - Raleigh NC, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

B23B 51/02

US Classification:

408231, 408226, 408713, 408230

Abstract:

A rotary cutting tool that is composed of a tool shank with at least one chucking groove or chip flute and one exchangeable cutting insert. At the tip of the shank a recess for accommodating the cutting insert is provided. The tool shank, on its circumference, has a limb with a bearing surface that is inclined relative to the tool axis and that corresponds to a likewise inclined bearing surface on a wing of the cutting insert. The inclination of the bearing surfaces produces an axial force that retains the cutting insert on the tool shank. The abstract of the disclosure is submitted herewith as required by 37 C. F. R. 1. 72(b). As stated in 37 C. F. R. 1. 72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure. ” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims.

US Patent:

20130209189, Aug 15, 2013

Filed:

Feb 1, 2013

Appl. No.:

13/756990

Inventors:

DIETER MUHLFRIEDEL - EBERMANNSTADT, DE
JURGEN SCHWAGERL - VOHENSTRAUSS, DE
RUY FROTA DE SOUZA, JR. - LATROBE PA, US
MICHAEL D. SHULTZ - DERRY PA, US
MICHAEL R. MCCORMICK - GREENSBURG PA, US
ROBERT A. ERICKSON - RALEIGH NC, US

Assignee:

KENNAMETAL, INC. - LATROBE PA

International Classification:

B23B 51/00

US Classification:

408227

Abstract:

A tool shank for use with a cutting insert in a rotary cutting tool includes a body having, and adapted to be rotated about, a central longitudinal tool axis, the body having a tip portion structured to receive at least a portion of the cutting insert therein. The shank also includes a pair of chip flutes formed in the body and a pair of recesses, each recess bordering a respective chip flute. Each recess includes a rim portion extending perpendicular to the tool axis and a bearing surface extending at an incline relative to the tool axis. Each rim portion is adapted to engage a corresponding surface on the cutting insert. Each bearing surface is adapted to engage a corresponding bearing surface on the cutting insert in a manner such that the cutting insert is pulled against the body when the rotary cutting tool is rotated about the tool axis.