US Patent: 1,210,937
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| Roll-grinding machine
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Patentee:
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| Lewis R. Heim (exact or similar names) - Danbury, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 06, 1915 |
| Granted: |
Jan. 02, 1917 |
| Reissue Information: |
| Reissued as RE15,035 (Jan. 25, 1921) |
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Jeff Joslin
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Description: |
| The inventor, Lewis Heim, is considered to be the inventor of the centerless grinder and this patent is the first in a series that define the idea and then further refine it. Heim had established the Ball & Roller Bearing Co. to mass-produce ball and roller bearing assemblies, especially for the automotive industry, and manufacturing the rollers for roller bearings was particularly slow and costly. Heim's original centerless grinder, as seen in this patent, uses the sides of a pair of wheels to grind the rollers. He would abandon this approach and instead use the faces of a pair of wheels. Even though that drastic change was still in the future, this patent captures the key ideas of centerless grinding: using a pair of wheels rotating in opposite directions and at different speeds so that the rollers are between the wheels and rotate at a rate controlled by the speed difference while experience a grinding contact related to the average speed of the two wheels. This approach was amenable to producing cylindrical forms of exceptional accuracy and surface finish. |
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