US Patent: 112,254
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| Improvement in rock-drills
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Patentee:
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| Simon Ingersoll (exact or similar names) - Brooklyn, NY |
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Patent Dates:
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| Granted: |
Feb. 28, 1871 |
| Reissue Information: |
| Reissued as RE6,292 (Feb. 16, 1875) |
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Jeff Joslin
Vintage Machinery entry for Ingersoll-Rand Co.
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Description: |
| This patent is sometimes credited as the first pneumatic drill, or pneumatic jackhammer, but it was preceded by numerous others, e.g., patent 6,237. Instead, this invention provides a much-improved tripod for supporting and directing the drill, and became recognized as a significant improvement in rock drills. |
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