Variable height arm structures, systems, and methods

An arm structure, comprising:

• a mount arm having an arm pivot structure having a defined axis, a first strut arm mount having a first arm strut axis that is perpendicular from the axis of the arm pivot structure, and a bias element pivot axis that is perpendicular to the axis of the arm pivot structure and collinear to the first arm strut axis.
• an adjuster box comprising a pivot structure having a defined axis, a first strut mount having a first strut axis that is perpendicular from the axis of the pivot structure, and a slot defined therethrough, wherein the slot comprises any of a curved slot or a non-linear slot, and wherein the slot is perpendicular to the axis of the pivot structure and collinear to the first strut axis;
• a strut element pivotably attached between the first arm strut axis and the first strut axis;
• a bias element having a first end and a second end opposite the first end, wherein the first end is pivotably attached to the bias element pivot axis on the mount arm, and the second end is pivotably attached to a point located on the slot;
• and
• a shell pivotably attached between the mount arm and the adjuster box.

A process, comprising the steps of:

• providing an arm structure comprising
• an upper shell having an upper surface that extends from a first inner end to a second outer end, and opposing sides that extend downward from the upper surface, wherein an interior is defined within the upper shell that is bounded by the upper surface and the opposing sides, wherein the upper shell substantially covers the top and sides of the arm structure,
• a first pivot structure that is pivotably attached to the opposing sides of the upper shell at the first inner end, wherein the first pivot structure comprises a slot defined therethrough, wherein the slot comprises any of a curved slot or a non-linear slot,
• a second pivot structure that is pivotably attached to the opposing sides of the upper shell at the second outer end,
• a strut that extends between an is pivotably connected to the first pivot structure and the second pivot structure, and
• a bias element having a first end and a second end, wherein the first end is pivotably attachable at any of a plurality of positions in relation to the slot, and wherein the second end is pivotably attachable to the second pivot structure,
• wherein a four-bar linkage is defined between the upper shell, the first pivot structure, the second pivot structure, and the strut;
• and
• adjusting the second end of the bias element at one of the plurality of positions.