Title of Invention

METHOD FOR UNSCREWING HREADED FASTENERS AND A CYLINDRICAL BIT FOR REMOVING DAMAGED SCREWS.

Abstract TITLE: BIT FOR REMOVING DAMAGED SCREWS This bit is installed in a counter-clockwise-rotating drill. The bit has an axis and a tip end with a point of about 140°. There are multiple scraping surfaces on the bit, each facing counter-clockwise into a longitudinal recess in the tip end. Each scraping surface has a scraping edge at an angle of about 70° to the axis. Behind the scraping surfaces the outer surface of the tip end curves down in a relief surface to a rearward edge adjacent another of the longitudinal recess.
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Documents:


Patent Number 219950
Indian Patent Application Number IN/PCT/2002/1063/KOL
PG Journal Number 20/2008
Publication Date 16-May-2008
Grant Date 14-May-2008
Date of Filing 19-Aug-2002
Name of Patentee BERGAMO PETER J
Applicant Address 85 HARRISON DRIVE, WOLCOTT, CT 06716, U.S.A.
Inventors:
# Inventor's Name Inventor's Address
1 BERGAMO PETER J 85 HARRISON DRIVE, WOLCOTT, CT 06716, U.S.A.
PCT International Classification Number B25B 27/18
PCT International Application Number PCT/US01/03699
PCT International Filing date 2001-02-23
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 09/519,362 2000-03-06 U.S.A.