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    • 8. 发明授权
    • Shoring apparatus
    • 更衣装置
    • US3791151A
    • 1974-02-12
    • US3791151D
    • 1972-11-08
    • PLANK D
    • PLANK D
    • E02D17/08E21D15/15F16J10/02E21D5/00
    • E02D17/083E21D15/15F16J10/02
    • A hydraulic shoring apparatus including oppositely positioned trench rails adapted for placement against the sides of a trench or other excavation and hydraulic jack means pivotally connected with the trench rails. The hydraulic jack means including a hydraulic cylinder having a piston slidably mounted therein, the piston having a rod adjustably attached therewith whereby the application of hydraulic fluid under pressure into the cylinder causes movement of the piston and rod to an extended position such that the trench rails are maintained against the sides of the trench. Protective sleeve means are mounted over the cylinder and rod with the rod in the extended position in order to protect both the cylinder and the rod from damage.
    • 一种液压支撑装置,包括相对设置的沟槽槽,其适于放置在与沟槽轨道枢转连接的沟槽或其他挖掘和液压千斤顶的侧面上。 液压千斤顶装置包括具有可滑动地安装在其中的活塞的液压缸,活塞具有可调节地附接的杆,由此将压力下的液压流体施加到缸中使得活塞和杆移动到延伸位置,使得沟槽轨道 保持在沟槽的两侧。 保护套装置安装在气缸和杆上,杆处于延伸位置,以保护气缸和杆不受损坏。