Spade drill bit

Details Spade drill bit Spade drill bit

2007-09-11

2007-09-11

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having central lead-screw

C408S227000

Reexamination Certificate

active

10547642

ABSTRACT:
A spade drill bit (202) comprises a shaft (204) having one end (205) configured to be engaged to a driving tool and a cutting head (206) attached at an opposite end of said shaft (204). The cutting head (206) includes a center point (216) having threads (240) defined thereon, including continuous threads (247) adjacent the tip and discontinuous threads (242) thereafter toward the base.

REFERENCES:
patent: 2627292 (1953-02-01), Kronwall
patent: 2883888 (1959-04-01), Stewart
patent: 5221166 (1993-06-01), Bothum
patent: 5433561 (1995-07-01), Schimke
patent: 2002/0127071 (2002-09-01), Vasudeva
patent: WO9805459 (1998-02-01), None

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