发明名称 |
IMPROVED THREE-PRONG SHELL |
摘要 |
An expansion assembly configured to be attached to a mine roof bolt, wherein the expansion assembly may include a plug defining an interior cavit y and an outer surface and an expansion shell having a plurality of spaced-apart prongs, preferably three prongs, and defining a plurality of shell grooves, wherein each of the spaced-apart prongs is oriented diametrically opposed to a corresponding shell groove.</S DOAB> |
申请公布号 |
CA2342707(A1) |
申请公布日期 |
2001.10.04 |
申请号 |
CA20012342707 |
申请日期 |
2001.04.04 |
申请人 |
JENNMAR CORPORATION |
发明人 |
BOOZER, LARRY;EATON, JACK R.;CALANDRA, FRANK JR.;DEMREY, BRANDON;STANKUS, JOHN C. |
分类号 |
E21D20/00;E21D21/00 |
主分类号 |
E21D20/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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