| 摘要 |
<p>A fifth wheel hitch having a single swinging jaw, i.e., pivotal lock element (30), a cam arm (70), a locking plunger (40), a release arm (54) and release handle (58) that function in an inter-related manner to clearly indicate the locked or unlocked condition of the lock element. The release handle (58) has notches (58a,58b) for cooperative inter-engagement with the top plate, specifically a lock notch (58b) and an unlock notch (58a), engageable with a flange (16) of the fifth wheel plate to cause the release handle to be located in specific positions. A cam surface (30') on a finger (30a) of the pivotal lock element (30) operates the cam arm (70) to shift the release handle (58) for releasing the unlock notch (58a) when the fifth wheel uncouples from the kingpin. The cam arm (70) is held over centre when the jaw is open, preventing the jaw from closing until the kingpin enters. When the release handle (58) is pulled to release the locking plunger (40), the lock notch (58b) engages the top plate to retain the pull handle until released from this notch. <IMAGE> <IMAGE></p> |
