Wing fold implement with latching structure

A multi-sectioned folding implement including a horizontally disposed main frame section having opposed outer ends;

• an inner wing frame having first and second ends and pivotally connected at its first end to an outer end of the main frame section for rocking between a horizontally disposed fieldworking position and an upright transport position wherein the second end is raised above the main frame;
• an outer wing frame pivotally connected to the second end of the inner wing frame for rocking between an extended position extending outwardly from the inner wing frame and a generally horizontal folded position over the inner wing frame;
• a first hydraulic cylinder connected between the inner and outer wing frames for rocking the outer wing frame to the horizontal folded position;
• first and second brackets connected to and extending upwardly from the inner and outer wing frames, respectively, when the wing frames are in the field-working position, said brackets including matingly engageable contact areas for preventing further folding of the outer wing frame relative to the inner wing frame beyond the horizontal folded position;
• a second hydraulic cylinder and means connecting the second cylinder between the main frame section and the inner wing frame for rocking the inner wing frame, with the outer wing frame in the folded position over the inner wing frame, to the upright transport position;
• and
• means for securing the outer wing frame relative to the inner wing frame in the preselected folded position as the inner and outer wing frames approach the upright transport position, said means for securing including a gravity actuated latch connected to a one of the first and second brackets and automatically movable into engagement with the other of the brackets as the inner wing frame moves toward the transport position with the outer wing frame in the folded position.