Drill bit having a shank with grooves

Details Drill bit having a shank with grooves Drill bit having a shank with grooves

1989-07-25

1990-07-24

Howell, Daniel

Cutting by use of rotating axially moving tool

Tool or tool with support

Including detailed shank

279 19, B23B 5102

Patent

active

049431927

ABSTRACT:
The present invention is directed toward a drill bit which firstly comprises two locking grooves (1,1') diametrically opposed with respect to each other, and secondly, also diametrically opposed, with respect to each other, a first driving groove (3) and a second driving groove (4) associated with a locking groove (2) by being superimposed thereon. The driving groove (4) is advantageously angularly offset with respect to the associated locking groove (2) so as to have, in the drill bit driving zone, the lateral faces of the two associated grooves almost merged. This permits an extension of the friction zone so as to increase the wear resistance thereof, while the opposite lateral faces or edges of the superimposed grooves defines projecting locking surfaces (7) insuring proper locking of the drill bit.

REFERENCES:
patent: 4107949 (1978-08-01), Wanner et al.
patent: 4512692 (1985-04-01), Nielsen
patent: 4655651 (1987-04-01), Hunger et al.
patent: 4691929 (1987-09-01), Neumaier et al.
patent: 4702651 (1987-10-01), Kleine
patent: 4717292 (1988-01-01), Phillips
patent: 4840519 (1989-06-01), Kleine

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