Wood drill bit

Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges

Reexamination Certificate

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Details

C408S212000, C408S213000, C408S225000

Reexamination Certificate

active

07665936

ABSTRACT:
The invention concerns a wood drill bit with a cylindrical drilling head. The drilling head has at its end a centering tip which is disposed on the longitudinal axis of the drill bit and which projects in the drilling direction for centering the wood drill bit, at least two main cutters which are arranged diametrically and radially or substantially radially and have main cutting edges, and a pan-cylindrical guide bell. Adjoining each main cutter is a chip ejection space which is partially open towards the connecting portion. It is proposed inter alia that the main cutter extends with a radially inwardly disposed portion into the centering tip and the chip ejection space is enlarged into the centering tip by means of a pre-chip ejection groove.

REFERENCES:
patent: 248854 (1881-11-01), Gladwin
patent: 778845 (1905-01-01), Cox
patent: 1185380 (1916-05-01), Davis
patent: 2193186 (1940-03-01), Bannister
patent: 2358077 (1944-09-01), Koett
patent: 2613710 (1952-10-01), Emmons
patent: 3064699 (1962-11-01), Gleason
patent: 5975814 (1999-11-01), Pomp
patent: 6354774 (2002-03-01), Haughton et al.
patent: 6394714 (2002-05-01), Eberhard
patent: 6443674 (2002-09-01), Jaconi
patent: 2007/0172325 (2007-07-01), Ebert
patent: 159977 (1983-04-01), None
patent: 3316193 (1984-11-01), None
patent: 29911945 (1999-10-01), None
patent: 2540424 (1984-08-01), None
patent: 2617753 (1989-01-01), None
German Examination Report dated Apr. 2, 2007, received in corresponding priority Application No. DE 10 2006 039 426.7, 2 pgs.

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