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热词
    • 69. 发明授权
    • Hydraulically-operated devices
    • 液压装置
    • US4422808A
    • 1983-12-27
    • US395973
    • 1982-07-07
    • Stephen P. Cook
    • Stephen P. Cook
    • E21D23/20E21D23/16
    • E21D23/20
    • An assembly of mine roof supports each of which has a control member and a hydraulically-operated member, e.g. a cantilever. The cantilevers operate one after the other in a predetermined sequence in response to actuation of one of the control members.Each cantilever is associated with a pressure-operated control valve and two serially-connected control valves which normally prevent operation of a cantilever in response to actuation of a control member unless the next-before cantilever in the series has completed its operation and the control member which caused that next-before cantilever to operate has been actuated.
    • 一种矿顶支架的组件,每个组件具有控制构件和液压操作构件,例如, 悬臂 响应于其中一个控制构件的致动,悬臂以预定的顺序一个接一个地操作。 每个悬臂与压力操作的控制阀和两个串联连接的控制阀相关联,其通常防止响应于控制构件的致动来操纵悬臂,除非串联中的先前的悬臂已经完成其操作,并且控制构件 这导致接下来的悬臂操作已被致动。