发明名称 |
SUPPORT FOR UNDERGROUND MINING AND TUNNEL CONSTRUCTION |
摘要 |
A hydraulic support for underground mining and tunnel construction includes an outer tube to form an upper prop and an inner tube which forms a lower prop and is received in the outer tube to define a pressure chamber. A footpiece is secured to a lower end of the inner tube. Provided on the upper end of the inner tube is a piston which is sealingly guided along the outer tube as pressure fluid is admitted into the upper prop. Disposed inside the lower prop at a location below the piston is a valve block for introducing pressure fluid into the pressure chamber, with a pressure tube connecting the valve block with the piston to thereby define a constant distance of the valve block to the footpiece.
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申请公布号 |
US2009202310(A1) |
申请公布日期 |
2009.08.13 |
申请号 |
US20090428913 |
申请日期 |
2009.04.23 |
申请人 |
BOCHUMER EISENHUTTE HEINTZMANN GMBH & CO. KG |
发明人 |
KOPPERS MANFRED |
分类号 |
E21D15/44;B23P11/00;E21D23/16 |
主分类号 |
E21D15/44 |
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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