US Patent: 1,924,545
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| Drop hammer
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Patentees:
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| Reginald P. Fitzgerald (exact or similar names) - Braintree, MA |
| William H. J. Fitzgerald (exact or similar names) - Braintree, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 22, 1928 |
| Granted: |
Aug. 29, 1933 |
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Jeff Joslin
Vintage Machinery entry for Pneumatic Drop Hammer Co.
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Description: |
| "Drop hammers are used largely for producing die work which requires such control of the hammer that a proper and accurate blow shall be struck, that no 'shivering' of the hammer shall take place on impact and a secondary blow avoided; otherwise, the pattern work of the die will be destroyed. The present invention comprises certain improvements upon the drop hammer construction disclosed in Patent No. 1,722,506, Henning G. Sahlin, granted July 30, 1929." |
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