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US Patent: 527,227
Drill-chuck
Patentee:
James H. Westcott - Oneida, Madison County, NY

USPTO Classifications:
279/112, 279/67

Tool Categories:
metalworking machines : drilling and boring : drill presses : drill press chucks
woodworking machines : wood drilling and boring : drill presses : drill press chucks

Assignees:
James H. Westcott - Oneida, Madison County, NY
Westcott Chuck Co. - Oneida, Madison County, NY

Manufacturer:
Westcott Chuck Co. - Oneida, Madison County, NY

Witnesses:
John J. Laass
Charles E. Stevens

Patent Dates:
Applied: Jun. 18, 1894
Granted: Oct. 09, 1894

Patent Pictures:
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"Vintage Machinery" entry for Westcott Chuck Co.
Description:
E. Laass - patent attorney

The famous Westcott chuck was a high quality device that was sold from about 1880 until at least 1943. They were made in a variety of sizes. A model 10A held bits up to 1/2 inch and was 2 1/2 inches in diameter. The model 12 1/2 A held bits up to 1 inch in diameter, was itself 4 inches in diameter and weighed a hefty 11 pounds. The prices in a 1943 catalog range between $12 and $20.

This invention relates to the class of chucks which are provided with a diametric groove in the face of the chuck-body in which groove are seated the jaws, which, by means of a right and left screw engaging correspondingly screw-threaded grooves in corresponding sides of the jaws, are moved synchronously either toward or from each other to grip or release the shank of the drill or other tool inserted between said jaws. In practice it has been found that the tightening of the grip of the jaws upon the drill or tool by the single screw engaging the jaws at one side of the axis of the chuck, subjects the entire chuck to a severe torsional strain which tends to crowd the jaws out of line with each other and break the chuck-body and bend or injure the screw. The object of ;this invention is to effectually obviate such injurious results; and to that end the invention consists essentially in the combination with a drill-chuck or analogous tool having gripping jaws disposed adjustably opposite each other and a screw engaging the jaws at one side thereof for moving them toward and from each other, of a brace on the opposite side of the jaws adjustably tying them together and thereby equalizing the strains at opposite sides of the axis of the chuck and maintaining the jaws in line with each other during the operation of the chuck.

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