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    • 4. 发明授权
    • Trailer hitch assembly
    • 拖车挂钩装配
    • US5890727A
    • 1999-04-06
    • US853087
    • 1997-05-08
    • Gregory B. May
    • Gregory B. May
    • B60D1/07B60D1/14B60D1/06
    • B60D1/07
    • A trailer hitch assembly that includes a hitch mount member having a chassis mount plate, a hitch mount plate having a plate mounting aperture bored entirely therethrough and four spaced alignment bores formed therein, and an extension arm in connection between the chassis mount plate and the hitch mount plate; a multi-ball hitch unit including a cross-shaped ball support structure including four support arms extending radially outward from a center portion having a structure mounting aperture formed therethrough; three trailer mount balls, each secured to the end of one of the four support arms; and a pintel hook secured to the end of the remaining one of the four support arms; and a positioning mechanism including a bolt assembly including a bolt having a cap portion and a threaded shaft portion; a securing nut threadable onto an end of the threaded shaft portion; a biasing spring; and two alignment pins, the alignment pins extending perpendicularly with respect to two of the four support arms and being positioned in a manner such that when the plate mounting aperture and the structure mounting aperture are in alignment the alignment pins are positionable in registration with two of the four spaced alignment bores, the biasing spring being positioned between the mounting plate and the support structure, the threaded portion of the bolt being positioned through the plate mounting aperture and the structure mounting aperture, the securing nut being threaded onto an end of the threaded shaft portion.
    • 一种拖车牵引组件,包括具有底盘安装板的搭接安装构件,具有完全穿过其穿过的板安装孔的搭接安装板和形成在其中的四个间隔开的对准孔以及在底盘安装板和搭接部之间连接的延伸臂 安装板; 包括十字形球支撑结构的多球挂钩单元,包括从具有穿过其形成的结构安装孔的中心部分径向向外延伸的四个支撑臂; 三个拖车安装球,每个固定到四个支撑臂之一的端部; 以及固定到所述四个支撑臂中的剩余的一个的末端的螳螂钩; 以及定位机构,其包括螺栓组件,所述螺栓组件包括具有盖部和螺纹轴部的螺栓; 可螺纹连接到螺纹轴部分的端部上的固定螺母; 偏置弹簧; 和两个对准销,对准销相对于四个支撑臂中的两个垂直地延伸并且以这样的方式定位,使得当板安装孔和结构安装孔对准时,对准销可定位成与两个 四个间隔开的对准孔,偏置弹簧定位在安装板和支撑结构之间,螺栓的螺纹部分通过板安装孔和结构安装孔定位,固定螺母拧到螺纹 轴部分。