Cutting by use of rotating axially moving tool – Tool or tool with support – Having inversely angled cutting edge
Patent
1995-05-17
1997-07-22
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having inversely angled cutting edge
408144, 408212, 408227, B23B 5100
Patent
active
056497962
ABSTRACT:
A spade drill bit device including an elongated shaft formed for rotation about a longitudinal axis thereof, and a flattened blade portion at one end of said shaft. The blade portion has generally planar and parallel opposing faces, and defines opposing side edges, and an end cutting edge therebetween. The cutting edge includes a pair of opposing side spurs each having spur tip portions positioned at the lateral extremities of the cutting edge and terminates at the corresponding side edge. A cutting edge triangular-shaped center tip is included axially aligned with the longitudinal axis, and having a distal end extending beyond the side spurs. The center tip is defined by downward edge portions extending away from the distal end. The cutting edge further includes respective converging edge portions extending between and connecting each side spur to the center tip. Each converging edge portion intersects a respective downward edge portion at a corresponding curved nadir portion positioned closer to the center tip than the respective spur portion.
REFERENCES:
patent: 679406 (1901-07-01), Watson
patent: 2575332 (1951-11-01), Cummins
patent: 2600286 (1952-06-01), Weiland
patent: 3920350 (1975-11-01), Southall
patent: 4330229 (1982-05-01), Croydon
patent: 4480952 (1984-11-01), Jeremias
patent: 4529341 (1985-07-01), Greene
patent: 4595322 (1986-06-01), Clement
patent: 4950111 (1990-08-01), Thomas
patent: 5061127 (1991-10-01), Thomas
patent: 5221166 (1993-06-01), Bothum
patent: 5291806 (1994-03-01), Bothum
Bishop Steven C.
Castle Tool Machinery Incorporated
LandOfFree
Carbide spade-type drill bit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Carbide spade-type drill bit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carbide spade-type drill bit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1556161