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公开(公告)号:US07744164B2
公开(公告)日:2010-06-29
申请号:US12177599
申请日:2008-07-22
申请人: David R. Hall , Ronald Crockett , Scott Dahlgren
发明人: David R. Hall , Ronald Crockett , Scott Dahlgren
IPC分类号: E21C35/18
CPC分类号: E21C35/183 , E21C2035/1806
摘要: In one aspect of the present invention, a degradation assembly comprises a shank with a forward end and a rearward end, the rearward end being adapted for attachment to a driving mechanism, with a shield rotatably attached to the forward end of the shank. The shield comprises an underside adapted for rotatable attachment to the shank and an impact tip disposed on an end opposing the underside. A seal is disposed intermediate the shield and the shank.
摘要翻译: 在本发明的一个方面,降解组件包括具有前端和后端的柄,所述后端适于附接到驱动机构,其中护罩可旋转地附接到柄的前端。 护罩包括适于可旋转地附接到柄的下侧和设置在与下侧相对的端部上的冲击尖端。 密封件设置在护罩和柄部之间。