US Patent: 865,787
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| Power-hammer
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Patentee:
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| Peter S. Macgowan (exact or similar names) - St. Louis, MO |
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Patent Dates:
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| Applied: |
Feb. 28, 1907 |
| Granted: |
Sep. 10, 1907 |
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Jeff Joslin
Vintage Machinery entry for Macgown & Finigan Foundry & Machine Co.
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Description: |
| This power hammer mechanism provides "means for accurately adjusting both the tension of the spring and the length of the driving mechanism", and also to avoid excessive impact forces on the ends of the spring which can cause the metal to crystallize and then break. |
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