Drill

Details Drill Drill

1993-09-20

1995-06-13

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408227, B23B 5102

Patent

active

054236401

ABSTRACT:
The present invention relates to a drill comprising a shaft with chip-conveying flutes and a drill head with two or more cutting elements. Each of the cutting elements comprises a cutting edge which is delimited between a chip-breaking surface and a relief surface and which, at least in the proximity of the geometrical center or rotational axis of the drill, comprises a curved portion. The cutting edge of the individual cutting elements is located with its curved portion in such a way that a tangential point on a straight line that extends from the central axis and tangentially touches said curved edge portion, is provided distantly from the central axis of the drill. In the immediate proximity of this central axis, the cutting edge is terminated in a small material portion which is common for all cutting edges and which extends between the cutting elements in order to serve for centering the drill.

REFERENCES:
patent: 3387511 (1968-06-01), Ackart, Sr. et al.
patent: 4116580 (1978-09-01), Hall et al.
patent: 4222690 (1980-09-01), Hosoi
patent: 4983079 (1991-01-01), Imanaga et al.
patent: 5088863 (1992-02-01), Imanaga et al.

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