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:
Sep. 07, 1999
Filed:
Aug. 14, 1998
Steve P Lipohar, Derry, PA (US);
William C Magill, Mentor, OH (US);
William B Tunis, Puyallup, WA (US);
Kennametal Inc., Latrobe, PA (US);
Abstract
A drill jig assembly for accurately supporting a drill relative to a workpiece is provided that includes a drill having a cylindrical shank, a chuck having a cylindrical exterior, and a hydraulically-operated collet for detachably gripping the drill shank, a housing tube for slidably and rotatably supporting the cylindrical exterior of the chuck, and a drill guide mounted on the distal end of the housing tube. The drill guide is formed from a carbide bushing having a pilot bore for rotatably receiving the cylindrical shank of the drill and maintaining a pilot concentric alignment between the bushing and the shank during a drilling operation. The use of hydraulic chuck in combination with the pilot bore of the carbide bushing allows the drill to accurately bore holes in a workpiece to very tight tolerances in a one-step, extend and retract drilling operation.