US Patent: 918,050
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| Valve Grinding Device
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Patentee:
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| Robert H. Hazeltine (exact or similar names) - New York, NY |
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Patent Dates:
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| Applied: |
Mar. 23, 1908 |
| Granted: |
Apr. 13, 1909 |
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Patent Pictures:
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Robert H. Hazeltine patent April 13, 1909 |
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Stan Schulz
Specialty Machine Co. Automatic Valve Grinder ca. 1912 (FLICKR)
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Description: |
| The patent claim is the combination of reciprocating rotation combined with progressive rotation, so that valve grinding is uniform around the valve circumference.
This patent date was later cited as the earliest of several patents used in the Sioux line of valve grinders produced by Albertson & Company of Sioux City, IA. (See also Hazeltine's parallel patent no. 918,049. |
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