Method and apparatus for opening blast-furnace tap holes
An improvement upon the apparatus and method disclosed in U.S. Pat. No. 4,273,202. To avoid loss of the drilling bit, a quick-change coupling apparatus is provided between the striking bar, on the one hand, and either the drill rod or poking bar, on the other.
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | An improvement upon the apparatus and method disclosed in U.S. Pat. No. 4,273,202. To avoid loss of the drilling bit, a quick-change coupling apparatus is provided between the striking bar, on the one hand, and either the drill rod or poking bar, on the other. |
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