Cutting by use of rotating axially moving tool – Tool or tool with support – Having inversely angled cutting edge
Patent
1991-11-01
1993-09-14
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having inversely angled cutting edge
76102, 408214, B23B 5102
Patent
active
052443191
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.
REFERENCES:
patent: 235234 (1880-12-01), Hardisty
patent: 433683 (1890-08-01), Jennings
patent: 2652083 (1953-09-01), Emmons
patent: 4529341 (1985-07-01), Greene
patent: 4968193 (1990-11-01), Chaconas et al.
Greenlee Textron, Inc. Product Catalog, pp. 98 and 99.
Greenlee Textron Inc.
Howell Daniel W.
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