Mine roof supports
    7.
    发明授权
    Mine roof supports 失效
    矿顶支撑

    公开(公告)号:US3885396A

    公开(公告)日:1975-05-27

    申请号:US35415973

    申请日:1973-04-23

    IPC分类号: E21D23/00 E21D23/04 E21D15/44

    摘要: A mine roof support comprising a floor beam, a roof lever pivotally mounted on the floor beam for engaging the roof, a variable length strut such as a hydraulic jack engaging pivotally between the floor beam and the roof lever at positions spaced from the pivot device and means to adjust the lever pivot on the floor beam to provide at least two separate pivoting positions for the roof lever. The roof lever may carry a roof beam at its free end for engaging the roof.

    摘要翻译: 一种矿顶支架,其包括地板梁,可枢转地安装在地板梁上用于接合屋顶的屋顶杆,可变长度支柱,例如液压千斤顶,枢转地在地板梁和车顶杆之间,与枢轴装置间隔开的位置处; 用于调整地板梁上的杠杆枢轴的装置,以为车顶杠杆提供至少两个单独的枢转位置。

    Superstructure in self-advancing roof supports
    8.
    发明授权
    Superstructure in self-advancing roof supports 失效
    自助式屋顶支持中的超级结构

    公开(公告)号:US3626700A

    公开(公告)日:1971-12-14

    申请号:US3626700D

    申请日:1970-01-26

    IPC分类号: E21D23/00 E21D15/44

    CPC分类号: E21D23/0047

    摘要: THE INVENTION PROVIDES A SELF-ADVANCING ROOF SUPPORT PRIMARILY FOR MINE WORKINGS IN WHICH A ROOF-ENGAGING SUPERSTRUCTURE CARRIED BY A PLURALITY OF HYDRAULIC PROPS UPSTANDING FROM A BASE INCLUDES LATERALLY SPACED, LONGITUDINALLY EXTENDING, ROOF BARS CONNECTED WITH EACH OTHER BY TRANSVERSELY EXTENDING SPRING STRIP ELEMENTS INCORPORATING ONE OR MORE LOOPED, UNDULATING, OR ARCUATE PORTIONS TO PROVIDE AN EXTENDED LENGTH OF THE STRIP ELEMENT BETWEEN CONNECTIONS TO THE ROOF BARS SUBSTANTIALLY EXCEEDING THE DISTANCE BETWEEN SUCH CONNECTIONS.