公开(公告)号：US5011119A

公开(公告)日：1991-04-30

申请号：US470098

申请日：1990-01-25

申请人： Robert L. Harrington

发明人： Robert L. Harrington

IPC分类号： B60S9/12

CPC分类号： B60D1/66 ,  B60S9/12

摘要： A hand-operated hydraulic jack rotatably mounted on a trailer to assist in removably attaching the trailer to the hitching mechanism of a towing vehicle. The jack can be rotated to a vertical position and hydraulically actuated with a hand-operated pump to lift or lower the trailer tongue relative to the hitching mechanism. Once the trailer is attached to the hitching mechanism or is otherwise being adequately supported, the jack can be retracted by opening a thumbscrew valve on the hydraulic circuiting body to allow the hydraulic fluid to move through the return circuit back to the hydraulic fluid reservoir in the jack. The jacks's actuator is retracted by means of springs at the sides of the jack. With the tongue of the trailer supported and the jack retracted, the jack may then be rotated to its horizontal position to provide maximum ground clearance.

摘要翻译： 可旋转地安装在拖车上的手动液压千斤顶，用于辅助可拆卸地将拖车附接到牵引车辆的连接机构。 千斤顶可以旋转到垂直位置并用手动泵液压致动以相对于联接机构提升或降低拖车舌头。 一旦拖车附接到挂钩机构或者否则被充分地支撑，则可以通过在液压回路体上打开翼形螺旋阀来缩回千斤顶，以允许液压流体通过返回回路移动回到液压流体储存器中 插口。 千斤顶的执行器通过弹簧在千斤顶的侧面缩回。 当拖车的舌头被支撑并且千斤顶缩回时，千斤顶然后可以旋转到其水平位置以提供最大的离地间隙。