Invention Grant
US5975552A Self-aligning trailer hitch 失效
自调整挂车挂钩

Self-aligning trailer hitch
Abstract:
A trailer hitch which is attached to a vehicle which is towed, such as a trailer, and is used to connect the towed vehicle to a conventional towing ball of a towing vehicle. The trailer hitch of this invention is extendible by the user so as to enable a towed vehicle to be connected to a towing vehicle when the two are approximately aligned, but they need not be precisely aligned.
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