Drill

Details Drill Drill

1998-05-18

1999-04-20

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Including detailed shank

175398, 175414, 408224, 408229, B23B 31117

Patent

active

058951792

ABSTRACT:
A drill including an elongate shaft (2) a rear end (5) of which is formed as a shank, and a drilling head (10) provided at the front end of the shaft (2) and having central cutting edges (11, 12) extending from a leading center point (14), which is provided substantially at an extension of a shaft axis, backward toward a circumference of the drilling head, and at least one minor cutting edge (13) a portion (n) of which extending transverse to the shaft axis projects beyond a circumference of the shaft (2), with the projecting portion (n) having a length equal from about 10% to 100% of an entire length of the minor cutting edge.

REFERENCES:
patent: 2773672 (1956-12-01), Holmes et al.
patent: 4212569 (1980-07-01), Anderson et al.
patent: 4605347 (1986-08-01), Jodock et al.
patent: 4635738 (1987-01-01), Schillinger et al.
patent: 4728231 (1988-03-01), Kunimori et al.
patent: 5007911 (1991-04-01), Baker
patent: 5165494 (1992-11-01), Barr
patent: 5186268 (1993-02-01), Clegg
patent: 5273380 (1993-12-01), Musacchia
patent: 5423824 (1995-06-01), Akerfeldt et al.
patent: 5584617 (1996-12-01), Houser
patent: 5664914 (1997-09-01), Taniguchi

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