| 摘要 |
A fifth wheel trailer hitch with locking mechanism that includes a pin that extends axially from a pivotal mounting of a platform of a trailer tow bar. The pin is preferably cylindrical and is grooved circumferentially adjacent to its bottom end for fitting into an a key way forward end lip formed in a mounting plate that is attached to a truck bed for prohibiting the pin from lifting from the key way. The pin includes a plug that, by turning a cam rod journaled through the pin, will extend or retract axially from a pin center opening to fit into a plug hole formed in the mounting plate in the center of the key way forward end, preventing, when extended, the pin from sliding therefrom. Which plug, extended by cam rod turning, is a primary lock, and the invention further includes straight rods, as secondary plug locks, arranged for travel through lateral holes in the pin into the pin open center to fit into holes in the plug side when the plug is extended by the primary lock, and further includes as a safety lock, a plate that is fitted into the key way depression to brace the pin in the key way forward end.
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