| 摘要 |
A hitch head or fifth wheel is provided including a pair of pivotable jaws which hold in place a kingpin of a highway trailer. A horizontally movable lock block, biased by a stiff spring to closed position, engages the jaws and holds them in closed position, maintaining the kingpin in place. The lock block is movable to an open position by a finger extending through an opening in the lock block. The finger is rigidly attached to a horizontally extending operating shaft which is rotatable by a handle to move the finger to an overcenter position holding the lock block in open position. The finger includes a transversely extending protrusion which is engaged by the jaws as the kingpin exits to pivot the finger from the overcenter position and allow the lock block to move to a position engaging the rear portion of the jaws, holding the jaws open until another kingpin enters the jaws and pivots the jaws to closed position.
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