US Patent: 187,167 - Improvement in grinding and polishing surfaces and wheels


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US Patent: 187,167

Improvement in grinding and polishing surfaces and wheels

Patentee:

Franklin B. Norton (exact or similar names) - Worcester, MA

USPTO Classifications:

501/143, 501/153, 51/308

Tool Categories:

industrial tools : grinding wheels

metalworking machines : grinders : sharpening machines : grinding wheels

Assignees:

None

Manufacturer:

Norton Co. - Worcester, MA

Witnesses:

E. E. Moore

Thomas H. Dodge

Patent Dates:
Applied:	Nov. 20, 1876
Granted:	Feb. 06, 1877

Patent Pictures:

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Vintage Machinery entry for Norton Co.

Description:

This patent was the foundation of Norton Co., a leading maker of grinding wheels and machines.

"The nature of my invention consists in the combination of corundum or emery, feldspar, and vitreous clay to form grinding, cutting, or polishing surfaces and wheels, as will be hereafter more fully explained." The recipe comprised mixing ¾ part corundum to two parts vitreous clay and one part feldspar, all ingredients dry and the latter two powdered. Add enough water to produce a mortar-like compound and then mold into the shape of a wheel. The wheel then goes into a kiln that is gradually heated until vitrification takes place, about 42 hours.