Robert Andrew Leu

US Patent:

39711358, Jul 27, 1976

Filed:

Sep 4, 1975

Appl. No.:

5/610206

Inventors:

Robert F. Leu - Delta OH

Assignee:

Dentsply Research & Development Corporation - Milford DE

International Classification:

A61C 302

US Classification:

32 48

Abstract:

A helical dental bur having a shank provided on one end with a cutting head having a series of similar teeth extending longitudinally and spaced evenly around the circumference thereof; said teeth each having a flat cutting face extending from the cutting edge radially toward the axis of the head to form one side of said tooth and provide a positive cutting rake therefor, a relative deep chip gash adjacent said face, and a convex relief surface extending from the cutting edge toward said gash adjacent the next succeeding tooth to form the opposite side of each tooth, said convex relief surface permitting said chip gashes to be substantially deeper than such gashes in conventional burs without sacrificing strength of said teeth to resist chipping and breakage of said cutting edges, as well as including the benefit of said flat cutting face which extends radially to provide said positive cutting rake.

US Patent:

41481615, Apr 10, 1979

Filed:

Nov 22, 1977

Appl. No.:

5/854297

Inventors:

William McCandless - Toledo OH
Robert F. Leu - Delta OH
Ernest A. Kroder - Felton PA
Charles J. Tomecek - Curtice OH

Assignee:

Dentsply Research & Development Corp. - Milford DE

International Classification:

B24B 302

US Classification:

51215CP

Abstract:

A bur grinding machine especially adapted to grind dental burs and including a turntable supporting a plurality of similar workheads having collets to support bur blanks; a plurality of grinding units mounted on a stationary base in circumferentially spaced locations around the periphery of said table and respectively operable to perform different grinding operations in sequence upon the heads of bur blanks; means to index, rotate, and advance the collets of the workheads automatically at each grinding unit to form a plurality of teeth upon the bur blanks; means to index said table to advance the burs in the workheads to the next grinding unit; means to feed and accurately position bur blanks within the collets of the workheads; and means to control the cycle of the machine throughout.

US Patent:

41062426, Aug 15, 1978

Filed:

May 2, 1977

Appl. No.:

5/793204

Inventors:

William McCandless - Toledo OH
Robert F. Leu - Delta OH
Ernest A. Kroder - Felton PA
Charles J. Tomecek - Curtice OH

Assignee:

Dentsply Research & Development Corp. - Milford DE

International Classification:

B24B 306

US Classification:

51225

Abstract:

A bur grinding machine especially adapted to grind dental burs and including a turntable supporting a plurality of similar workheads having collets to support bur blanks; a plurality of grinding units mounted on a stationary base in circumferentially spaced locations around the periphery of said table and respectively operable to perform different grinding operations in sequence upon the heads of bur blanks; means to index, rotate, and advance the collets of the workheads automatically at each grinding unit to form a plurality of teeth upon the bur blanks; means to index said table to advance the burs in the workheads to the next grinding unit; means to feed and accurately position bur blanks within the collets of the workheads; and means to control the cycle of the machine throughout.

US Patent:

40528219, Oct 11, 1977

Filed:

Mar 15, 1976

Appl. No.:

5/666848

Inventors:

William McCandless - Toledo OH
Robert F. Leu - Delta OH
Ernest A. Kroder - Felton PA
Charles J. Tomecek - Curtice OH

Assignee:

Dentsply Research & Development Corporation - Milford DE

International Classification:

B24B 302
B24B 360

US Classification:

51 53

Abstract:

A bur grinding machine especially adapted to grind dental burs and including a turntable supporting a plurality of similar workheads having collets to support bur blanks; a plurality of grinding units mounted on a stationary base in circumferentially spaced locations around the periphery of said table and repsectively operable to perform different grinding operations in sequence upon the heads of bur blanks; means to index, rotate, and advance the collets of the workheads automatically at each grinding unit to form a plurality of teeth upon the bur blanks; means to index said table to advance the burs in the workheads to the next grinding unit; means to feed and accurately position bur blanks within the collets of the workheads; and means to control the cycle of the machine throughout.