System for cutterbar support having torsion device with elastic material and load limiting apparatus

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

• a first arm pivotably secured to the header, the first arm including a first portion configured to support the cutterbar, the first arm including a second portion including a torsion device having a mass of elastic material connected to an adjustment assembly, the second portion configured to be pivotably rotatable about art 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;
• a load limiting apparatus that prevents further torsional loading for the mass of elastic material the load limiting assembly attached to the torsion device, the further torsional loading generated from a force equal or less than a force required to raise the first portion by pivotable rotation of the second portion about the axis,
• the adjustment assembly including a second arm interconnecting the torsion device and an adjustment device having a first segment, the adjustment device configured to movably receive a connecting adjustment device;
• wherein the first segment of the adjustment device is configured to follow a predetermined path in a first direction with respect to the axis in response to movement of the adjustment device in a first direction with respect to the first adjustment device;
• and wherein the first segment of the adjustment device is configured to follow a predetermined path in a second direction with respect to the axis in response to movement of the connecting adjustment device in a second direction opposite the first direction with respect to the adjustment device.