US Patent: 142,048
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| Improvement in cutter-heads
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Patentee:
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| Albert H. Shipman (exact or similar names) - Arcadia, NY |
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Patent Dates:
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| Applied: |
Aug. 07, 1873 |
| Granted: |
Aug. 19, 1873 |
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Patent Pictures:
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1 | 2
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Jeff Joslin
Vintage Machinery entry for James S. Graham & Co.
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Description: |
| The innovation here is a spiral cutter-head plus a knife that is normally straight but is bent to fit into the helical cutter seat. A knife that is normally flat (or that can be flattened) is easier to manufacture and sharpen. |
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