Transport lock joint for stack fold toolbar

1. In combination with a stack fold implement having a center section adapted for connection to a tow vehicle and first and second wing sections mounted on respective outboard ends of said center section, said implement being reconfigurable between a field working position with said wing sections generally aligned with said center section and a stack fold transport position with said wing sections rotated upwardly and inwardly to respective stack folded positions over said center section, said wing sections having respective front and back toolbars with inboard ends, said front toolbar inboard ends and said back toolbar inboard ends being positioned in opposing relation over said center section with said implement in its transport position, the improvement of a transport support, which comprises:

each said wing section having an engagement structure associated with a respective toolbar inner end;

said wing section engagement structures engaging whereby said wing sections are stabilized relative to each other in said transport position;

an insert element mounted on one of the toolbar inboard ends of the first wing section and projecting therefrom in an inboard direction;

a retainer element mounted on a corresponding toolbar inboard end of the second wing section, which toolbar end is positioned in opposed relation to said first wing section toolbar end with said implement in its transport position, said retainer element including a receiver open in an inboard direction and adapted to removably receive said insert element with said implement in its transport position;

said first and second wing section toolbars having respective vertical legs located at their inboard ends, said vertical legs having engagement faces adapted for positioning in generally opposed relation with said implement in its transport position;

said insert element comprising a tab extending outwardly from a respective engagement face;

said receiver being associated with an opposed engagement face;

said tab having an outwardly-converging configuration;

a retainer element mounted on a respective engagement face and including said receiver, said retainer having an outwardly-diverging configuration cooperating with said tab configuration to receive and retain said tab in said receiver with said implement in its locked position;

said retainer element comprising a subframe with top, bottom and opposite side perimeter members enclosing said receiver;

each said member having an outwardly-diverging face;

said receiver being formed by said outwardly-diverging member faces; and

said insert element having a pair of outwardly-converging faces adapted for engaging a corresponding pair of retainer subframe outwardly-diverging faces whereby said wing sections are guided to their locked position by the corresponding configurations of said extension and said retainer.

2. In combination with a stack fold implement having a center section adapted for connection to a tow vehicle and first and second wing sections mounted on respective outboard ends of said center section, said implement being reconfigurable between a field working position with said wing sections generally aligned with said center section and a stack fold transport position with said wing sections rotated upwardly and inwardly to respective over-center stack folded positions over said center section and forming respective parallelograms with said center section, said wing sections having respective front and back toolbars with inboard ends, said front toolbar inboard ends and said back toolbar inboard ends being positioned in opposing relation over said center section with said implement in its transport position, the improvement of a transport support, which comprises:

each said wing section having an engagement structure associated with a respective toolbar inner end;

said wing section engagement structures engaging whereby said wing sections are stabilized relative to each other in said transport position;

one of said engagement structures including an insert clement mounted on one of the toolbar inboard ends of the first wing section and projecting therefrom in an inboard direction;

the other of said engagement structures including a retainer element mounted on a corresponding toolbar inboard end of the second wing section, which toolbar end is positioned in opposed relation to said first wing section toolbar end with said implement in its transport position, said retainer element including a receiver open in an inboard direction and adapted to removably receive said insert element with said implement in its transport position;

said first and second wing section toolbars having respective vertical legs located at their inboard ends, said vertical legs having engagement faces adapted for positioning in generally opposed relation with said implement in its transport position;

said insert element comprising a tab extending outwardly from a respective engagement face;

said receiver being associated with an opposed engagement face;

said tab having an outwardly-converging configuration;

a retainer element mounted on a respective engagement face and including said receiver, said retainer having an outwardly-diverging configuration cooperating with said tab configuration to receive and retain said tab in said receiver with said implement in its locked position;

said retainer element comprising a subframe with top, bottom and opposite side perimeter members enclosing said receiver;

each said member having an outwardly-diverging face:

said receiver being formed by said outwardly-diverging member faces; and

said insert element having a pair of outwardly-converging faces adapted for engaging a corresponding pair of retainer subframe outwardly-diverging faces whereby said wing sections are guided to their locked position by the corresponding configurations of said extension and said retainer.