Small drill

Details Small drill Small drill

2005-12-20

2005-12-20

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

C408S230000, C408S705000

Reexamination Certificate

active

06976812

ABSTRACT:
A small drill includes one chip-discharging flute which is helically formed in the exterior surface of a cutting portion of the small drill. The small drill also includes a flute-shaped portion which is formed in the front region of the chip-discharging flute in the rotating direction, which is connected to the chip-discharging flute, and which is open at the exterior surface of the cutting portion. The core diameter ratio d/D, in percent, of the small drill is set to 60% or more, and a margin angle θ thereof is set to 120° or more.

REFERENCES:
patent: 4222690 (1980-09-01), Hosoi
patent: 4449865 (1984-05-01), Yankovoy et al.
patent: 5584617 (1996-12-01), Houser
patent: 2552694 (1985-04-01), None
patent: 60-23924 (1985-06-01), None
patent: 8-90323 (1996-04-01), None
patent: 2002-28810 (2002-01-01), None
patent: 2003-311522 (2003-11-01), None
patent: 1103961 (1984-07-01), None
Incomplete copy of Denmark patent 64715, published Aug. 16, 1946, copy in 408/199.
Incomplete copy of either a German or Austrian patent 13815, published Mar. 6, 1897, copy in 408/199.

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