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公开(公告)号:US4386670A
公开(公告)日:1983-06-07
申请号:US256972
申请日:1981-04-23
申请人: Gustav L. Westermark
发明人: Gustav L. Westermark
CPC分类号: E21B10/20 , E21B10/28 , E21B7/28 , Y10T407/1922 , Y10T407/1938
摘要: A boring head for reaming a pre-drilled hole in raise boring or for similar earth cutting operations comprising a plurality of roller cutters (13-22). For purposes of extending the radius of the boring head (10) in operation or decreasing its dimensions during transport one or several extension elements (36, 37) are provided for detachable attachment to the boring head (10) by means of a wedge connection (42).
摘要翻译: 一种用于在提升镗孔中进行铰孔的预钻孔或用于类似的切削操作的无孔头,包括多个辊切割器(13-22)。 为了在运输过程中延伸钻头(10)的半径或在运输过程中减小其尺寸,提供一个或多个延伸元件(36,37),用于通过楔形连接件可拆卸地附接到钻头(10) 42)。