Drill bit

Details Drill bit Drill bit

1994-04-19

1996-02-27

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Including detailed shank

175415, 408199, 408231, B25D 1702

Patent

active

054943825

ABSTRACT:
A rotary or rotary/percussion drill bit 10 has a taper socket 14 in one end. A wall 18 bounds the socket 14. A plurality of recesses 20 is provided in the wall. In one embodiment, each recess 20 extends longitudially and resembles a flute. It has a valley 22 flanked by peaks 24. In another embodiment, the recesses may be circumferential, e.g. helical.

REFERENCES:
patent: 583317 (1897-05-01), Wilson
patent: 1136987 (1915-04-01), Wakfer
patent: 2156287 (1939-05-01), Hokanson
patent: 2689109 (1954-09-01), Curtis
patent: 2696973 (1954-12-01), Baumgartner
patent: 2725216 (1955-11-01), Brown
patent: 2733943 (1956-02-01), Nater
patent: 2800303 (1957-07-01), Dick
patent: 2807443 (1957-09-01), Wyman
patent: 2890021 (1959-06-01), Sandvig
patent: 2955804 (1960-10-01), Feucht
patent: 3027953 (1962-04-01), Coski
patent: 3336081 (1967-08-01), Ericsson
patent: 3605924 (1974-09-01), Donegan
patent: 4273202 (1981-06-01), Phillips
patent: 4799844 (1989-01-01), Chuang

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