US Patent: 2,722,831
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| Hardness testers
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Patentee:
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| Charles W. Smith (exact or similar names) - Stratford, CT |
| USPTO Classifications: |
| 73/81 |
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Patent Dates:
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| Applied: |
Jul. 29, 1950 |
| Granted: |
Nov. 08, 1955 |
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Jeff Joslin
Vintage Machinery entry for American Chain Co.
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Description: |
| This patent number was seen in a sales brochure for the "Tukon Tester" from the Wilson Mechanical Instrument Division, American Chain & Cable Co., Inc. The patent specification notes, "In U. S. Patent No. 2,091,995 there is described an indenter which is in the form of a pyramid with two greatly elongated edges, which produces as impression, as viewed with the microscope, of a rhombus with one diagonal much longer than the other..." This present patent provides improvements on that predecessor patent. One improvement is intended to reduce vibration during contact of specimen and indenter, and another improvement is to place the specimen in proper position for testing by the act of focusing the microscope on the specimen. |
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