Drill bit for hand drills

Details Drill bit for hand drills Drill bit for hand drills

1987-06-24

1989-06-20

Bilinsky, Z. R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Including detailed shank

279 60, 279123, 279 19, 408240, B23B 3104, B23B 5102

Patent

active

048405191

ABSTRACT:
The invention contemplates an improved drill-bit construction wherein the shank by which the bit is clamped is characterized by (a) three angularly spaced grooves which are continuous over their entire length of engageability to the jaws of a multi-jaw chuck, (b) at least one of the grooves being closed at its rear end, (c) the rear end of the closed-end groove is at no greater offset than 5-mm from the rear end of the bit, and (d) the diameter of the cutting part of the bit shank is greater than the diameter of the clamping part of the shank, to an extent which at most results from shaped formation of the chip-removal groove.

REFERENCES:
patent: 3333490 (1967-08-01), Popin
patent: 4502824 (1985-03-01), Dohse et al.
patent: 4536109 (1985-08-01), Hunper et al.
patent: 4702651 (1987-10-01), Kleine

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