US Patent: 237,311
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| Art of Preparing Emery in the Manufacture of Grinding Stones
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Patentee:
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| Franklin B. Norton (exact or similar names) - Worcester, Worcester County, MA |
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Patent Dates:
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| Applied: |
Mar. 22, 1880 |
| Granted: |
Feb. 01, 1881 |
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Joel Havens
"Vintage Machinery" entry for Norton Co.
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Description: |
| Abstract:
n the manufacture of solid grinding-wheels and similar articles, which are made from ordinary granulated and graded emery mixed with suitable vitrifiable substances molded into shape and subsequently burned or baked in kilns for solidifying or hardening the mass, it has heretofore been found impossible, owing to certain properties inherent to emery in its ordinary condition, to produce uniformly good wheels or articles. since a large proportion of those made become cracked, damaged, or destroyed in the firing or baking operation, especially with pieces of large size. The extent of loss from this cause is probably not less than fifty per cent, of the whole, as not more than one-half of all the wheels or other articles which are made and put into the firing-kilns come out after the firing in such condition as to be of any value, the balance of them being warped; burst open, cracked, or otherwise destroyed during the burning operation.
Claim:
In the manufacture of solid, burned, or vitrified grinding-wheels and similar articles formed of or containing emery, the process or method of preventing the destruction or damage of the product, which consists in preparing the emery previous to its incorporation into such wheels, &c., by means of a preliminary firing operation |
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