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    • 3. 发明授权
    • Pantograph-type jack
    • PANTOGRAPH型杰克
    • US3857548A
    • 1974-12-31
    • US37457973
    • 1973-06-28
    • TAKEUCHI T
    • TAKEUCHI T
    • B66F3/12
    • B66F3/12
    • A pantograph-type jack comprising a plurality of upper jack arm assemblies each of which includes a pair of opposite jack arms having inner toothed ends pivoted to a movable load support member and in engagement with each other. The jack has a plurality of lower jack arm assemblies, each of which includes a pair of opposite jack arms having the inner toothed ends pivoted to a stationary base member and in engagement with each other. Spaced movable support blocks are provided for pivotally supporting the outer ends of the jack arms of the upper and lower jack arm assemblies, with one of said support blocks having a center coarsely threaded bore threadedly engaging a first rod while the other support block has a center plain bore which supports a second rod. A sleeve having one end fixedly attached to the adjacent end of the first rod is provided with a finely threaded inner surface that is threadedly engaged by the second rod, which, in turn, is connected to a receiving member 14 for actuating the jack.
    • 集电弓型插座,包括多个上部插座臂组件,每个上部插座臂组件包括一对相对的插座臂,其具有枢转到可移动负载支撑构件并彼此接合的内齿端。 千斤顶具有多个下部千斤顶臂组件,每个下部千斤顶臂组件包括一对相对的千斤顶臂,其具有枢转到固定基座构件并彼此接合的内齿端。 间隔的可移动支撑块被设置用于枢转地支撑上部和下部千斤顶臂组件的千斤顶臂的外端,其中一个所述支撑块具有螺纹接合第一杆的中心粗螺纹孔,而另一个支撑块具有中心 支撑第二杆的平孔。 具有固定连接到第一杆的相邻端部的一端的套筒设置有细螺纹的内表面,该内表面与第二杆螺纹接合,第二杆又连接到用于致动千斤顶的接收构件14。