Cutter bar support linkage

An agricultural vehicle comprising:

• a chassis configured to move across a surface;
• and
• a header attached to the chassis, the header comprising:
• a frame extending in a lateral direction,
• a plurality of support arms, each extending from a respective proximal end at the frame to a respective distal end located forward of the frame,
• a cutter assembly attached to the respective distal ends of the support arms,
• a draper belt comprising an upper belt portion located above the support arms, and a lower belt portion located below the upper belt portion, and
• a respective parallel linkage connected between each support arm and the frame or between each support arm and the cutter assembly, each parallel linkage comprising:
• an upper link extending from a proximal upper pivot to a distal upper pivot, and
• a lower link located below the upper link and extending from a proximal lower pivot to a distal lower pivot,
• wherein a first distance extending from the proximal upper pivot to the distal upper pivot is equal in magnitude to a second distance extending from the proximal lower pivot to the distal lower pivot, and
• a third distance extending from the proximal upper pivot to the proximal lower pivot is equal in magnitude to a fourth distance extending from the distal upper pivot to the distal lower pivot;
• wherein the upper belt portion extends along a cross-belt direction that is perpendicular a travel direction of the upper belt portion, and the proximal upper pivot and the proximal lower pivot of each respective parallel linkage are positioned on a respective line that is oriented at an angle of 60 to 120 degrees relative to the cross-belt direction when the header is in a freestanding static state.