| 摘要 |
The invention comprises an extraction device, particularly for underground mining operations, provided with a removable trepan of the rotating and swinging type. In the said device, a trepan 3 and a ladle 4 of this trepan jointly form an articulation 18 of the ladle and are furthermore made in a conical and cuneiform shape. The trepan 3 or its shaft 5 is clamped in the said ladle 4 by the intermediary of a transmission 10 serving as a chock and having mutually interlocking wedges 11, 12. Application, in particular, to the extraction of coal. <IMAGE>
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