Torsion spring 82 a engages the top plate 14 and a recess 83 a formed in locking jaw 12 a while torsion spring 82 b engages the top plate 14 and a recess 83 b formed in locking jaw 12 b. 3, the locking jaws are provided with torsion springs 82 a and 82 b that surround and are secured in place by hinge pins 16 a and 16 b ( FIG. As the kingpin enters the fifth wheel, it contacts the two locking jaws 12 a and 12 b separating them to allow for its entrance into the throat. A kingpin 76 enters the throat 24 of the fifth wheel through the mouth 78. Insertion of a trailer kingpin into the fifth wheel 10 is shown in FIG.
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