Kennametal Inc.

George G Barkley

Howard J McCreery

Edward L Sorice

John A Cmar, Jr

An adjustable head arrangement for the shank of a boring bar is disclosed having an easily replaceable tool unit and also having an axially adjustable abutment means on the tool unit so that the cutting point of the tool unit is firmly supported and held during cutting operations but is adjustable with respect to the shank of the boring bar in between different cutting operations.

Adjustable boring bar

A shank for an adjustable boring bar is disclosed herein having first and second members telescopically engaged in a nonrotatable relation from one to the other with one of the members having mounted thereon an axially adjustable abutment means such that rotation of the abutment means on one member provides relative axial movement between the first and second members. A recess is shown formed on the outer surface of the innermost telescopically engaged member, the recess having a declining surface in the direction of the abutment means such that a clamp element located and engaged in the outermost telescopically engaged member is operable downwardly to engage said declining surface and hold the first and second members in a firm abutting relationship.

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New Alexandria, PA, United States of America

George G Barkley