Spade bit

Details Spade bit Spade bit

2011-04-12

2011-04-12

Gates, Eric A (Department: 3726)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

C408S211000, C408S227000, C408S229000

Reexamination Certificate

active

07922429

ABSTRACT:
The drill bit comprises a cutting blade formed at one end of a shank. The cutting blade has a pair of cutting shoulders that extend inwardly from the outer sides of the blade toward the bit axis. A tip having converging sides that create a point extends from the shoulders. The cutting edge of each shoulder is beveled with respect to the plane of the face of the blade. A flute is provided on the leading portion of each blade face adjacent the cutting edges. Each flute is a smooth curve that creates a substantially uninterrupted recess on each face of the blade that facilitates chip removal, increases the drill rate and lowers the power required to drill a hole. A non-stick coating may be applied to the blade to further facilitate chip removal.

REFERENCES:
patent: 0124089 (1872-02-01), Shepardson
patent: 0131946 (1872-10-01), Ford
patent: 0146344 (1874-01-01), Ladd et al.
patent: 0356138 (1887-01-01), Knight
patent: 0764664 (1904-07-01), Jones
patent: 877592 (1908-01-01), Parry et al.
patent: 1047466 (1912-12-01), Wagner
patent: 1056670 (1913-03-01), Hayden
patent: 1165854 (1915-12-01), Davis
patent: 1275889 (1918-08-01), Flander
patent: 1398070 (1921-11-01), Doyle
patent: 1398780 (1921-11-01), Hayden
patent: 1415317 (1922-05-01), Crawford et al.
patent: 1499584 (1924-07-01), Litchfield
patent: 2230645 (1941-02-01), Jones
patent: 2543206 (1951-02-01), Smith
patent: 2593823 (1952-04-01), Wilson
patent: 2613710 (1952-10-01), Emmons
patent: 2618304 (1952-11-01), Wilson
patent: 2621548 (1952-12-01), Williams
patent: 2627292 (1953-02-01), Kronwall
patent: 2652083 (1953-09-01), Emmons
patent: 2681673 (1954-06-01), Mackey
patent: 2689131 (1954-09-01), Priest
patent: 2692627 (1954-10-01), Stearns
patent: 2752965 (1956-07-01), Mackey
patent: 2782824 (1957-02-01), Robinson
patent: 2794468 (1957-06-01), Huxtable
patent: 2812791 (1957-11-01), Mackey
patent: 2883888 (1959-04-01), Stewart
patent: 2934113 (1960-04-01), Hollien
patent: 3543820 (1970-12-01), Tulumello
patent: 3564947 (1971-02-01), Maier
patent: 3748052 (1973-07-01), Jensen
patent: 3920350 (1975-11-01), Southall
patent: 3966350 (1976-06-01), Benjamin
patent: 3997279 (1976-12-01), Porter
patent: 4012970 (1977-03-01), Hintz et al.
patent: 4047826 (1977-09-01), Bennett
patent: 4050841 (1977-09-01), Hildebrandt
patent: 4060335 (1977-11-01), Holloway et al.
patent: 4066379 (1978-01-01), Prohaska
patent: 4078621 (1978-03-01), Dewar et al.
patent: 4079766 (1978-03-01), Conley et al.
patent: 4093395 (1978-06-01), Luebbert et al.
patent: 4160616 (1979-07-01), Winblad
patent: 4286904 (1981-09-01), Porter et al.
patent: 4289432 (1981-09-01), Elkins et al.
patent: 4524449 (1985-06-01), Colling
patent: 4595322 (1986-06-01), Clement
patent: 4682917 (1987-07-01), Williams et al.
patent: 4725171 (1988-02-01), DeTorre
patent: 4815902 (1989-03-01), Durfee, Jr.
patent: 4826364 (1989-05-01), Grunsky
patent: 4950111 (1990-08-01), Thomas
patent: 5049010 (1991-09-01), Oakes
patent: 5061127 (1991-10-01), Thomas
patent: 5099933 (1992-03-01), Schimke et al.
patent: 5145018 (1992-09-01), Schimke et al.
patent: 5149234 (1992-09-01), Durfee, Jr.
patent: 5193951 (1993-03-01), Schimke
patent: 5221166 (1993-06-01), Bothum
patent: 5228812 (1993-07-01), Noguchi et al.
patent: 5273557 (1993-12-01), Cerutti et al.
patent: 5286143 (1994-02-01), Schimke
patent: 5291806 (1994-03-01), Bothum
patent: 5433561 (1995-07-01), Schimke
patent: 5452970 (1995-09-01), Sundstrom et al.
patent: 5458211 (1995-10-01), Dennis et al.
patent: D376809 (1996-12-01), Stone et al.
patent: 5599144 (1997-02-01), Bickham et al.
patent: 5649796 (1997-07-01), Durney
patent: 5697738 (1997-12-01), Stone et al.
patent: 5700113 (1997-12-01), Stone et al.
patent: 6026918 (2000-02-01), Briese
patent: 6224302 (2001-05-01), Cole
patent: 6227774 (2001-05-01), Haughton et al.
patent: 6253812 (2001-07-01), Rinehart
patent: 6270297 (2001-08-01), Fang et al.
patent: 6290439 (2001-09-01), Bludis et al.
patent: 6354773 (2002-03-01), Konen
patent: 6371702 (2002-04-01), DeWald et al.
patent: 6431801 (2002-08-01), Vasudeva et al.
patent: 6499919 (2002-12-01), Feld
patent: 6524034 (2003-02-01), Eng et al.
patent: 6957937 (2005-10-01), Vasudeva
patent: 7033643 (2006-04-01), Sugita et al.
patent: 7140814 (2006-11-01), Singh et al.
patent: 7473056 (2009-01-01), Durfee
patent: 7540696 (2009-06-01), Houle
patent: D608801 (2010-01-01), Evatt et al.
patent: 2002/0127071 (2002-09-01), Vasudeva
patent: 2005/0249563 (2005-11-01), Scott et al.
patent: 2006/0083595 (2006-04-01), Wiker et al.
patent: 697971 (1998-10-01), None
patent: 20308626 (2004-11-01), None
patent: 89123 (1983-09-01), None
patent: 0127322 (1984-12-01), None
patent: 0775560 (1997-05-01), None
patent: 2083767 (1981-08-01), None
patent: 56015907 (1981-02-01), None
patent: 518345 (1976-07-01), None
patent: 9711346 (1997-03-01), None
patent: 9805459 (1998-02-01), None
patent: 0100376 (2001-01-01), None
patent: 04080632 (2004-09-01), None
Danish Patent and Trademark Office; Office Action; Sep. 23, 2010; issued in Danish Patent Application No. PA 2006 01099.

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