US Patent: 565,500
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| Auger
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Patentee:
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| Azariah Yeldon Pearl (exact or similar names) - Rochester, NH |
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Patent Dates:
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| Applied: |
Apr. 11, 1895 |
| Granted: |
Aug. 11, 1896 |
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Kirk Eppler
"Vintage Machinery" entry for Pearl Square Hole Auger Manufacturing Co.
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Description: |
| The second in a series of patents where the inventor created and refined his square-hole auger. An example is labeled "MADE BY THE PEARL SQUARE AUGER MFG CO. NEW YORK. USA. PAT OCT 3 '93, AUG 11 '96, JUNE 18 '98." These dates correspond, respectively, to patents 505,844, 606,575, and 788,941, which implies that the present patent design was short-lived. The present patent's improvements are aimed at lubricating the boring-head to prevent overheating, and consists of channels where oil can be conveyed down the shaft to the boring-head. A clutch is used to disengage the cutters when reversing out of the hole. Judging by the subsequent patent, the clutch mechanism was too complex and was designed out altogether. |
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