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. 14, 1993
Filed:
Nov. 01, 1991
Paul Cochran, Stillman Valley, IL (US);
Greenlee Textron Inc., Rockford, IL (US);
Abstract
A boring bit for boring holes in one or more workpieces such as wood and the like. An axially elongated shank portion of the boring bit has a tool engaging portion at one end and a head portion on a second end. A central axis longitudinally extends through the shank portion. The head portion includes a helically disposed surface on the end of the head portion which is frusto-conically sloped inwardly towards the central axis and generally towards the tool engaging portion. The helical surface has leading and following termini of which the leading terminus is advanced beyond the following terminus more than one-half of a helical revolution around the central axis along the shank portion. A cutting face, which is a planar surface, is perpendicularly spaced away from and extends parallel to the central axis. The cutting face intersects the leading terminus for scribing the bore circumference and scraping material from a workpiece when the boring bit is employed to form a bore in such a workpiece. A cutting edge and a scraping edge are defined by an intersection of the cutting face with the helical surface and a perimeter surface of the shank portion, respectively. A scribing edge is defined by an intersection of the helical surface and the perimeter surface of the shank portion. A scribing tip is defined by an intersection of the scraping edge, cutting edge, and scribing edge. The scribing tip facilitates the scribing function of the boring bit. A threaded lead screw portion axially extends away from the head portion for piloting the boring bit into a workpiece during a boring operation. Spaced apart spiral flutes are formed around the perimeter surface of the shank portion for removing material from the bored hole during the bore forming operation.