Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Reexamination Certificate
2006-11-28
2010-11-16
Howell, Daniel W (Department: 3726)
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
C076S108600, C451S048000, C408S230000, C408S225000
Reexamination Certificate
active
07832966
ABSTRACT:
The present invention is directed to a helical drill configuration that allows substantially flat bottomed holes to be machined. At the cutting end of the body member, there are at least two cutting edges that are symmetrically oriented on opposing sides of the rotational axis of the drill. In an embodiment of the invention, first and second cutting edge portions form a continuous surface which provides strength and tool stability. The height of the second portions of each of the cutting edges remains relatively consistent along the horizontal for formation of a generally flat bottom hole. In the embodiment, a center point is defined by two sloped peak surfaces. A central straight chisel edge is formed by the intersection of the two sloped peak surfaces. The first cutting edge section extends from the chisel edge to the second cutting edge section. The first cutting edge section for both cutting edges is formed by symmetrically thinning the two peak surface. In the invention, stress at the center portion of the helical cutting tool is limited by the chisel edge and first sections of the cutting edge near the center portion having a balanced geometry. The balanced geometry of the helical drill also prevents the drill from wobbling and creating deviations in the hole being formed. The chisel edge may blend with a first curvilinear cutting edge and the first curvilinear cutting edge may also have a positive rake to promote cutting.
REFERENCES:
patent: 2400586 (1946-05-01), Zimmermann
patent: 2600286 (1947-09-01), Weiland
patent: 2778252 (1957-01-01), Oxford, Jr.
patent: 3387511 (1968-06-01), Ackart et al.
patent: 3564947 (1971-02-01), Maier
patent: 3788409 (1974-01-01), Curington
patent: 4116580 (1978-09-01), Hall et al.
patent: 4222690 (1980-09-01), Hosoi
patent: 4488840 (1984-12-01), Pollington
patent: 4565473 (1986-01-01), Hosoi
patent: 4583888 (1986-04-01), Mori et al.
patent: 4605347 (1986-08-01), Jodock et al.
patent: 4620822 (1986-11-01), Haque et al.
patent: 4688972 (1987-08-01), Kubota
patent: 4744705 (1988-05-01), Imanaga
patent: 4826368 (1989-05-01), Tikal et al.
patent: 4878788 (1989-11-01), Wakihira et al.
patent: 4893968 (1990-01-01), Levy
patent: 4898503 (1990-02-01), Barish
patent: 4968193 (1990-11-01), Chaconas et al.
patent: 4983079 (1991-01-01), Imanaga et al.
patent: 5037251 (1991-08-01), Roth
patent: 5141369 (1992-08-01), Palace
patent: 5273380 (1993-12-01), Musacchia
patent: 5288183 (1994-02-01), Chaconas et al.
patent: 5338135 (1994-08-01), Noguchi et al.
patent: 5350261 (1994-09-01), Takaya et al.
patent: 5423640 (1995-06-01), Lindblom et al.
patent: 5486075 (1996-01-01), Nakamura et al.
patent: 5626446 (1997-05-01), Ching
patent: 5700113 (1997-12-01), Stone et al.
patent: 5716172 (1998-02-01), Nakamura et al.
patent: 5904455 (1999-05-01), Krenzer et al.
patent: 6132149 (2000-10-01), Howarth
patent: 6135681 (2000-10-01), Nuzzi et al.
patent: 6190097 (2001-02-01), Thomas
patent: 6261034 (2001-07-01), Cselle
patent: 6270298 (2001-08-01), Colvin
patent: 6312432 (2001-11-01), Leppelmeier
patent: 6315505 (2001-11-01), Moore
patent: 6443674 (2002-09-01), Jaconi
patent: D477515 (2003-07-01), Winivis
patent: 6585460 (2003-07-01), Meece et al.
patent: 6739809 (2004-05-01), Shaffer
patent: 6988859 (2006-01-01), Borschert et al.
patent: 7140815 (2006-11-01), George et al.
patent: 7422396 (2008-09-01), Takikawa
patent: 2003/0175085 (2003-09-01), Prokop
patent: 2004/0018064 (2004-01-01), Liu
patent: 2004/0151553 (2004-08-01), George et al.
patent: 2005/0053438 (2005-03-01), Wetzel et al.
patent: 2005/0249562 (2005-11-01), Frejd
patent: 2006/0056930 (2006-03-01), Rompel
patent: 216607 (1909-11-01), None
patent: 1177904 (1964-09-01), None
patent: 3316193 (1984-11-01), None
patent: 3624617 (1988-01-01), None
patent: 3628262 (1988-01-01), None
patent: 4026603 (1991-04-01), None
patent: 4307553 (1993-09-01), None
patent: 4312265 (1993-10-01), None
patent: 4417166 (1995-02-01), None
patent: 4435857 (1996-04-01), None
patent: 29609017 (1996-07-01), None
patent: 19602566 (1997-07-01), None
patent: 20209767 (2003-11-01), None
patent: 10337985 (2005-03-01), None
patent: 69927417 (2006-06-01), None
patent: 0088037 (1983-01-01), None
patent: 0089123 (1983-09-01), None
patent: 0127322 (1984-12-01), None
patent: 0137898 (1985-04-01), None
patent: 0508468 (1992-10-01), None
patent: 0890404 (1999-01-01), None
patent: 725363 (1932-05-01), None
patent: 58160009 (1983-09-01), None
patent: 59076709 (1984-05-01), None
patent: 59161208 (1984-09-01), None
patent: 63093520 (1988-04-01), None
patent: 01140908 (1989-06-01), None
patent: 04025308 (1992-01-01), None
patent: 2006088267 (2006-04-01), None
patent: 9842469 (1998-10-01), None
RTW Advertisement, “New High Performance Drill Provides Elevated Productivity,” reprinted from Metalworking Digest, Oct. 1994 by Rogers Tool Works, Inc. Rogers, AR, One Page.
Ford David L.
George Stephen M.
Moring Raymond E.
Shultz Michael D.
Howell Daniel W
Kennametal Inc.
Meenan Larry R.
LandOfFree
Drill for making flat bottom hole does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Drill for making flat bottom hole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill for making flat bottom hole will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4173756