US Patent: 1,306,106
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Drill-steel-pinning device
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Patentee:
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Jesse Ditson (exact or similar names) - Littleton, CO |
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Patent Dates:
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Applied: |
Jun. 30, 1917 |
Granted: |
Jun. 10, 1919 |
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Jeff Joslin Vintage Machinery entry for Ingersoll-Rand Co.
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Description: |
The invention is a machine to sharpen a rock drill containing a longitudinal hole for the conveying of air and water to the cutting edge to carry away the swarf. During sharpening the hole tends to become blocked, and this invention forces a pin through the hole to clear it. See also patent 1,349,330, which gives a further improvement to this invention. |
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