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Shirttails for reducing damaging effects of cuttings
   
Document Number
US Patent 7350600
Issued Date
April 1, 2008
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Abstract
An earth-boring bit has a bit body that includes head sections, each having depending bit legs with a circumferentially extending outer surface, a leading side, and a trailing side. A bearing shaft depends inwardly from each of the bit legs for mounting a cutter. The bit includes a beveled surface formed at a junction of the leading side and the outer surface of each bit leg. The beveled surface is angled relative to a radial plane emenating from the axis of the bit. The angle of the beveled surface is at least 20 degrees, and extends to an inner surface of the bit leg. The bit can also have a layer of hardfacing on the leading, trailing and shirttail surfaces of the bit leg. A diversion finger of hardfacing extends circumferentially to direct cuttings.
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Number of Claims:
17
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Owner
Published
April 1, 2008
Application Number
11/511,119
Filed
August 28, 2006
US Classification
175/374   175/425
Int'l Classification
E21B   10/50   (20060101)  
Attorney/Law Firm
Parent Case
RELATED APPLICATION This application is a continuation application of, and claims the benefit of, U.S. application Ser. No. 10/902,222, filed Jul. 29, 2004, now U.S. Pat. No. 7,182,162 and which is currently pending.
USPTO Field of Search
175/374   175/425  
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