BIT FOR REMOVING DAMAGED SCREWS

Title:

BIT FOR REMOVING DAMAGED SCREWS

Document Type and Number:

WIPO Patent Application WO2001066310

Kind Code:

A3

Abstract:

This bit is installed in a counter-clockwise-rotating drill. The bit has an axis and a tip end (14) with a point of about 140 DEG . There are multiple scraping surfaces (20) on the bit, each facing conter-clockwise into a longitudinal recess (18) in the tip end. Each scraping surface (20) has a scraping edge at an angle of about 70 DEG to the axis. Behind the scraping surfaces (20) the outer surface of the tip end curves down in a relief surface to a rearward edge adjacent another of the longitudinal recess (18).

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Inventors:

BERGAMO PETER J (US)

Application Number:

PCT/US2001/003699

Publication Date:

March 21, 2002

Filing Date:

February 23, 2001

Export Citation:

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Assignee:

BERGAMO PETER J (US)

International Classes:

B25B23/00; B23P19/06; B25B27/18; (IPC1-7): B25B27/18

Foreign References:

US0839105A	1906-12-25
DE19715802A1	1998-04-16
US2923335A	1960-02-02
US2815054A	1957-12-03
US4713990A	1987-12-22
US5251516A	1993-10-12

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