US 6,626,745 B1 · Precision drill sharpener and grinding wheel assembly therefor

Abstract

A precision drill sharpener and grinding wheel assembly is provided, as is a corresponding drill chuck for use with the drill sharpener, in which the drill sharpener includes a lever and spring clip alignment subassembly for properly positioning a drill in the drill chuck, and sharpening ports for sharpening the drill and splitting the drill tip, the sharpening ports being positioned such that a single grinding wheel assembly is used to both sharpen the drill and split the tip. The drill sharpener uses a small diameter grinding wheel operated at high speed to provide cutting rates comparable to large industrial sharpeners. The drill chuck is of short length, relative to most of the drills to be sharpened, and is open at the back end, enabling the manipulation of the drill by its shank relative to the drill chuck when disposed in the alignment subassembly.

Claims7

Dependent claims

A drill sharpener comprising:

a housing;
a motor disposed in said housing having a motor-shaft extending therefrom;
a grinding wheel assembly comprising a grinding wheel operatively coupled to said motor shaft;
a drill mounting chuck;
a pair of peripheral cams carried by the barrel portion of the chuck;
said housing defining at least one chuck receiving port having a chuck receiving sleeve therein to position the chuck and a drill in operative relation to a grinding surface of the grinding wheel;
wherein said grinding wheel is made of steel and said grinding surface comprises diamond plated to said grinding wheel;
wherein said motor operates at speeds on the order of 15,000 revolutions per minute and wherein a size of said grinding wheel is selected such that, when operating with said motor, a cutting rate comparable to industrial sharpeners is achieved.

5 more elements

Dependencies are inferred from the claim text.

Precision drill sharpener and grinding wheel assembly therefor

Life of this patent

Precision drill sharpener and grinding wheel assembly therefor

Life of this patent

Abstract

Claims7