Patent ID: 7930871

Claim:
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 connected to an adjustment assembly, the second portion configured to be pivotably rotatable about an 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; the adjustment assembly including a second arm interconnecting the torsion device and a first adjustment device having a first segment, the first adjustment device configured to movably receive a second adjustment device; wherein the first segment of the first adjustment device is configured to follow a predetermined path in a first direction with respect to the axis in response to movement of the second adjustment device in a first rotational direction with respect to the first adjustment device; and wherein the first segment of the first adjustment device is configured to follow a predetermined path in a second direction with respect to the axis in response to movement of the second adjustment device in a second rotational direction opposite the first rotational direction with respect to the first adjustment device.