TRAILER HITCH DRAWBAR TIGHTENING MECHANISM
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United States of America Patent
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Oct 16, 2018
Grant Date -
Oct 18, 2018
app pub date -
Jun 20, 2018
filing date -
Jun 20, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
A drawbar for a trailer hitch receiver tube has a translation screw passing from the back end to the front end of the drawbar in a longitudinal unthreaded passage in the drawbar. A ramp nut is threaded onto the translation screw and is retained in a ramp nut chamber in the front end of the drawbar. A captive ball is retained in a captive ball retention chamber passing between the ramp nut chamber and the exterior of the drawbar. A ramp on the ramp nut pushes the ball to extend beyond the exterior of the drawbar when the translation screw is turned to pull the ramp nut backward in the ramp nut chamber. This eliminates all play between the drawbar and the receiver tube in which the drawbar is inserted. A spring between the ramp nut and the drawbar may urge the ramp nut forward.
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