| 摘要 |
Trailer hitch ( 10 ) has a pivotal ball mount ( 30 ) having upper and lower wedge-shaped parallel plates ( 52, 54 ) that are connected by pivot pin ( 64 ) to the opening ( 31 ) of socket ( 29 ). Lock lever ( 34 ) is pivotally mounted in the mounting element ( 26 ) and is spring biased toward locking engagement with the recesses ( 82, 84 ) of the pivotal ball element. By tilting the lock lever ( 34 ) away from the pivotal ball mount, the pivotal ball mount is free to rotate so that its hitch ball can move in an arc laterally for alignment with the ball receptacle ( 16 ) of the trailer tongue ( 14 ). Forward movement of the towing vehicle and trailer causes and pivotal ball mount to become aligned with the lock lever, and the spring ( 44 ) urges the lock lever back into locking engagement with the recesses ( 82 or 84 ). The pivotal ball mount ( 30 ) can be inverted so as to raise or lower the height of the hitch ball.
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