发明名称 |
YIELDING BOLT AND ASSEMBLY |
摘要 |
A mine roof bolt includes an elongated rod and a polymer coating layer. The elongated rod has a first end and a second end with a protruding portion extending radially outward from the elongated rod. The polymer coating layer covers at least a portion of the elongated rod between the first and second ends. The elongated rod is movable relative to the polymer coating layer in an axial direction. The elongated rod has a first position where the elongated rod has a predetermined axial position relative to the polymer coating layer and a second position where the elongated rod has a displaced axial position relative to the first position. |
申请公布号 |
ZA201105089(B) |
申请公布日期 |
2012.07.25 |
申请号 |
ZA20110005089 |
申请日期 |
2011.07.11 |
申请人 |
FCI HOLDINGS DELAWARE, INC |
发明人 |
OLDSEN JOHN G;WU YAOKUN;LAMOTHE MARC W |
分类号 |
E21D |
主分类号 |
E21D |
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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