发明名称 |
Mine prop |
摘要 |
A mine prop has a post or column formed by two telescopingly interfitted tubes, one of which has a bottleneck configuration over which the other is spread to provide a resistance to telescoping contraction. At the upper end, a nut is rotatable on the post and can advance the threaded spindle engaged therein to brace the prop between the roof and ceiling of a subterranean structure.
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申请公布号 |
US5314161(A) |
申请公布日期 |
1994.05.24 |
申请号 |
US19920891574 |
申请日期 |
1992.05.29 |
申请人 |
BOCHUMER EISENHUTTE HEINTZMANN GMBH & CO. KG |
发明人 |
DOMANSKI, LOTHAR;PODJADTKE, RUDI |
分类号 |
E04G25/04;E21D15/24;E21D15/32;(IPC1-7):E04G25/00 |
主分类号 |
E04G25/04 |
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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