US Patent: 421,218
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Combined Boring Tool
Countersink/Counterbore Bit
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Patentee:
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| Morris Wood (exact or similar names) - Chicago, IL |
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Patent Dates:
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| Applied: |
Nov. 11, 1889 |
| Granted: |
Feb. 11, 1890 |
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Patent Pictures:
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1 | 2
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Jeff Joslin
Vintage Machinery entry for Morris Wood & Sons
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Description: |
| The drawings do not really represent the tool as actually manufactured. The innovation is an auger bit with a hole down the center into which a twist drill (or just a rod with a screw tip) is inserted, thus forming the center section of the auger. The center bit is fixed in place with a set screw. This construction allows the tip to be removed for sharpening the auger spurs. (The patent drawing does not really show an auger bit but rather a counter-boring drill.) As the sharpening gradually reduces the length of the auger, the placement of the screw-tip can be adjusted. In addition, a damaged screw-tip can be replaced for considerably less than the cost of replacing the entire auger bit. This style of auger bit was seen in a 1903 catalog from Morris Wood & Sons of Chicago, makers of countersinks, boring bits and twist drills for woodworkers. |
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