Cutterbar adjustment support for a crop harvesting header

A system for supporting a cutterbar of a crop harvesting header comprising:

• an adjustment assembly including
• a first arm pivotably secured to the header, the first arm including a first portion configured to support the cutterbar, the first arm comprising a second portion including a torsion device having a mass of elastic material connected to the adjustment assembly, the second portion configured to be pivotably rotatable about a first axis by the adjustment assembly to selectably increase or decrease a force appliable to the first portion in order to raise or lower the first portion with respect to the header;
• and
• the adjustment assembly further includes a second arm coupling the torsion device to a linkage movable in a substantiall vertical direction;
• an interconnecting member coupled to the header and configured for movement in a horizontal direction;
• a connecting lever having one end pivotally connected to the interconnection member and another end coupled to the linkage of the adjustment assembly, wherein the connecting lever has a pivot portion for rotation about a second axis the second axis is perpendicular to the first axis,
• wherein as the interconnection member is urged in a first horizontal direction the lever is urged to rotate about the second axis in a first direction, and further the linkage is urged to move toward the second arm thereby rotating the second arm about the first axis in an second direction, wherein the second direction is opposite to the first direction;
• further wherein as the interconnecting member is urged in a second horizontal direction, the lever is urged to rotate about the second axis in a first direction, and further the linkage is urged to move away from the second arm thereby rotating the second arm about the first axis in an second direction, wherein the second direction is opposite to the first direction, the adjustment assembly further including at least one hydraulic ram in fluid communication with a pressurized fluid source.