Mine roof expansion anchor with improved bore hole engagement means and method of installation thereof,申请号US19920883115-传众专利搜索

Mine roof expansion anchor with improved bore hole engagement means and method of installation thereof

申请公布号：US5219248(A)

申请号：US19920883115

申请日期：1992.05.14

申请公布日期：1993.06.15

申请人：

THE EASTERN COMPANY

发明人：WRIGHT, RAYMOND L.

分类号：E21D21/00

主分类号：E21D21/00

摘要：A mine roof expansion anchor having a conventional tapered camming plug and radially expansible shell having associated therewith an element which resiliently engages the wall of a bore hole as a roof bolt carrying the anchor is inserted in the hole. The resilient element may be incorporated in the structure of a bail having bore wall engagement portions position in a plane closer to the lower end of the expansion shell than the lowest position of the tapered plug after full expansion. The engagement portions may comprise outwardly and downwardly extending portions of the bail legs, either at the terminal ends or pierced from the bail material slightly above the ends. In another embodiment, the engagement portions extend from a support nut positioned on the bolt below the lower end of the shell.