发明名称 |
Hydraulic mine prop |
摘要 |
A hydraulic mine prop includes an inner piston-like prop guided within an outer cylinder-like prop, and a roof fall valve. The interior space of said inner prop communicates freely with the working chamber of the prop, and the roof fall valve is arranged outwardly on the prop and rigidly secured thereon, the valve being connected to the working chamber by an orifice provided in the prop and leading to the working chamber. The cross-sectional area of the roof fall valve in its open position.
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申请公布号 |
US4404893(A) |
申请公布日期 |
1983.09.20 |
申请号 |
US19780887774 |
申请日期 |
1978.03.17 |
申请人 |
VEREINIGTE OESTERREICHISCHE EISEN- UND STAHLWERKE - ALPINE MONTAN AKTIENGESELLSCHAFT |
发明人 |
SIGOTT, SIEGFRIED;SUESSENBECK, HEINRICH;ZITZ, ALFRED;SIEBENHOFER, GOTTFRIED |
分类号 |
E21D23/04;E21D15/44;E21D23/16;(IPC1-7):F15B15/22 |
主分类号 |
E21D23/04 |
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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