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    • 9. 发明授权
    • Pipe jack
    • 管道千斤顶
    • US06725971B1
    • 2004-04-27
    • US10154133
    • 2002-05-22
    • Richard Bair
    • Richard Bair
    • E04G100
    • E04G7/28B25H1/06B25H1/10E04G1/32Y10T403/32524
    • An improved load-supporting system for scaffolding, lengths of elongated stock used in the construction industry, tools, and other loads includes a unique system for adjusting the height at which a load is held above a supporting surface. The invention includes a column having a column axis of alignment and at least one sleeve disposed about the column in coaxial sliding engagement therewith. The sleeve has an appendage forming a radially inwardly facing jaw and a jamming washer that surrounds the column and extends into the jaw. The height at which a load is held above a supporting surface is varied by adjusting the relative longitudinal positions of the sleeve and the column. By momentarily forcing the jamming washer into perpendicular alignment relative to the column, incremental adjustment of the relative positions of the sleeve and the column occur. However, with each incremental adjustment, the jamming plate is forced against the wedging surface of the jaw, thus forcing it out of perpendicular alignment with the column and halting any further movement of the load toward the underlying surface until the next incremental adjustment.
    • 用于脚手架的改进的负载支撑系统,在建筑行业中使用的细长股票的长度,工具和其他负载包括用于调节负载被保持在支撑表面上方的高度的独特系统。 本发明包括具有对准的柱轴线的柱和围绕柱同轴滑动接合的至少一个套筒。 套筒具有形成径向向内的夹爪的附件和围绕柱并延伸到夹爪中的卡住垫圈。 负载被保持在支撑表面上方的高度通过调节套筒和柱的相对纵向位置来改变。 通过立即强制干扰垫圈相对于柱体垂直对准,发生套筒和柱的相对位置的增量调整。 然而,随着每次增量调整,卡纸板被迫抵靠钳口的楔形表面,从而迫使其脱离与柱的垂直对准,并且阻止负载向着下面的表面的任何进一步运动,直到下一增量调节。