Boring bit and method for manufacture thereof

Details Boring bit and method for manufacture thereof Boring bit and method for manufacture thereof

1982-09-13

1985-07-09

Briggs, William R.

Metal tools and implements, making

Blank or process

Drill

408 16, 408225, 408226, B21K 502, B23B 5100

Patent

active

045274495

ABSTRACT:
There are disclosed herein power tool boring bits having boring depth indicating markings on the shanks thereof. The markings are produced by colored oxiding of substantially the entire shank of the tool followed by selective abrasion of the shank to remove bands of substantially only the thin surface oxide in alternate array with bands of the colored oxide.

REFERENCES:
patent: 509667 (1893-12-01), Lavigne
patent: 1984839 (1934-12-01), Murray
patent: 2782824 (1957-02-01), Robinson
patent: 2886291 (1959-05-01), Frisby

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