US Patent: 142,070
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Dies For Forming Hammers
Improvement in the Manufacture of Hammers
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Patentee:
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| Jonathan Yerkes (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 18, 1873 |
| Granted: |
Aug. 19, 1873 |
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Patent Pictures:
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Jonathan Yerkes Pat. Aug. 19, 1873 |
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Stan Schulz
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Description: |
| The eye is punched first, and filled with a temporary plug, then the work piece is rotated during multiple strikes of the dies shown, thereby forming the ball-pein hammer head.
See the DATAMP entry for pat. no 150,385 for more on the Yerkes & Plumb partnership. |
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