an implement wing frame folding apparatus is provided for a mobile machine and includes a main frame , a wing frame pivotally connected to the main frame , and a striker pin offset from the pivot axis of the wing frame . a float bar having first and second ends is provided with the first end pivotally connected to the wing frame . an actuating device is pivotally connected to and between the main frame and the float bar second end for selectively moving the float bar to pivot the wing frame between lowered and raised positions . a latch is pivotally mounted to the main frame for engaging the striker pin in an engaging position when the wing frame is in the raised position . a biasing mechanism is provided on the main frame for biasing the latch toward the engaging position .