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48 条记录 (耗时 0.011 秒)

    Mine roof supports
    1.
    发明授权
    Mine roof supports 失效

    公开(公告)号：US3590586A

    公开(公告)日：1971-07-06

    申请号：US3590586D

    申请日：1969-04-28

    申请人： GULLICK LTD

    发明人： LUBOJATSKY WALTER ,  PELSER-BERENSBERG BERNHARD VON

    IPC分类号： E21D23/16 ,  E21D23/00 ,  E21D15/44

    CPC分类号： E21D23/0078

    摘要： A mine roof support has a hydraulic leg-aligning device which on pressurization assumes an extension intermediate full and zero extension and which is positively connected so as to push and pull the leg as required. The device may be double-acting piston and cylinder with means for injecting pressure fluid to make up the quantity of fluid in each end of the cylinder to a respective predetermined amount. Alternatively the device may comprise a hydraulically extensible member and a hydraulically contractable member so that on pressurization the first fully extends and the second fully contracts. The two are connected in series mechanically.

    Mine roof support
    8.
    发明授权
    Mine roof support 失效
    矿山屋顶支持

    公开(公告)号：US3646769A

    公开(公告)日：1972-03-07

    申请号：US3646769D

    申请日：1969-09-16

    申请人： GULLICK LTD

    发明人： POLLARD THOMAS

    IPC分类号： E21D23/06 ,  E21D15/44

    CPC分类号： E21D23/06

    摘要： A mine roof support comprises a base structure, extensible prop means mounted on said base structure and a roof-engaging structure mounted on said prop means. The roof-engaging structure includes a canopy of U-shape or having a U-shaped part and a roof-engaging bar or member positioned or having a part positioned between or partially between the limbs of said Ushaped canopy or U-shaped part thereof. In one preferred embodiment of the invention the canopy is supported on at least one front prop and on at least one rear prop and the roofengaging bar or member is pivotally connected to the canopy by a pivot having its axis positioned between said front and rear props.

    摘要翻译： 矿顶支撑件包括基座结构，安装在所述基座结构上的可延伸支撑装置和安装在所述支承装置上的屋顶接合结构。 屋顶接合结构包括U形篷顶或具有U形部分和顶部接合杆或构件，其​​定位或具有位于所述U形顶盖或U形部分之间或部分位于所述U形顶盖或U形部分之间的部分 其中。 在本发明的一个优选实施例中，顶盖被支撑在至少一个前支撑件和至少一个后支撑件上，并且车顶接合杆或构件通过其轴线位于所述前后之间的枢轴枢转地连接到罩盖 道具。