Boring bit and method for manufacture thereof
AssigneeRule Industries, Inc.
InventorsWilliam E. Sydlowski, Harold A. Trent
Life of this patent
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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.
Claims12
In a boring bit for power drills comprising a metal shank having a free end adapted for reception in the chuck of a power drill and the other end of which shank comprises bore cutting means, the improvement which comprises an array of bore depth indicator markings along the length of said shank, said array comprising a plurality of spaced apart bands of a thin colored oxide of the shank metal alternating with spaced apart bands of bright shank metal, said thin colored oxide and bright metal bands being performed by thinly and colorably oxiding substantially the entire shank and then selectively removing spaced apart bands of substantially only said thin colored oxide to expose corresponding bands of bright shank metal thereunder.
A method for providing the shank of a boring bit for power drills with bore depth indicator markings which comprises colorably and thinly oxiding substantially the entire shank of the bit and selectively abrading spaced apart bands of substantially only said thin colored oxide therefrom, thereby to expose corresponding bands of bright shank metal thereunder in alternate array with spaced apart bands of said thin colored oxide.
Dependencies are inferred from the claim text.