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A transfer device for matching the big-diameter electric tool with small-diameter drill rod is disclosed. An internal sleeve has a cylindrical pin on its upper inner surface for matching with the slot on big-diameter drill rod, an upper hole on its upper part for containing upper steel ball matched...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A transfer device for matching the big-diameter electric tool with small-diameter drill rod is disclosed. An internal sleeve has a cylindrical pin on its upper inner surface for matching with the slot on big-diameter drill rod, an upper hole on its upper part for containing upper steel ball matched with the pit on big-diameter drill rod, a lower hole for containing lower steel ball matched with the pit of small-diameter drill rod inserted in the lower end of internal sleeve, and the spring baffle ring, spring, and spring loop bar sleeve respectively on the upper, middle and lower parts of said internal sleeve. |
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