Torsional stiffness transfer mechanism for a hinged harvester head

An agricultural vehicle comprising:

• a chassis configured for movement on a surface;
• a header mounted to the chassis, the header having:
• a center section having a center section upper frame and a center section lower frame;
• a first wing section having a first wing section upper frame and a first wing section lower frame;
• a first hinge connecting the center section lower frame to the first wing section lower frame;
• and
• a first torque transfer linkage connecting the center section upper frame to the first wing section upper frame, the first torque transfer link comprising:
• a first link,
• a second link,
• a first pivot connection joining the first link to the center section upper frame, and providing a respective single degree of rotational freedom between the first link and the center section upper frame,
• a second pivot connection joining the first link to the second link, and providing a respective single degree of rotational freedom between the first link and the second link, and
• a third pivot connection joining the second link to the first wing section upper frame, and providing a respective single degree of rotational freedom between the second link and the first wing section frame.