Support apparatus for display devices and other objects

A support apparatus comprising:

• an arm assembly, the arm assembly having a first end and a second end;
• a support assembly attached to the arm assembly;
• a mounting device attached to the arm assembly, the mounting device sized to retain a display device;
• a counterbalance mechanism extending between the first end of the arm assembly and the second end of the arm assembly, the counterbalance mechanism having a first end and a second end opposite the first end;
• a vertically adjustable attachment mechanism attaching the first end of the counterbalance mechanism to one of:
• the arm assembly and the support assembly, the vertically adjustable attachment mechanism sized and shaped such that a vertical position of the first end of the counterbalance mechanism is adjustable, the vertically adjustable attachment mechanism comprising
• a receiving body immovably affixed to the first end of the arm assembly or the support assembly, the receiving body having a groove,
• a rotatable member that is attached to the receiving body, the rotatable member being rotatable in a first direction and in an opposite second direction,
• a nut or moveable body attached to or positioned on the first end of the counterbalance mechanism, the nut or moveable body also being moveably attached to the rotatable member such that rotation of the rotatable member causes the nut or moveable body to move along the rotatable member to change a vertical position of the first end of the counterbalance mechanism, rotation of the rotatable member in the first direction driving movement of the nut or moveable body to change the vertical position of the first end of the counterbalance mechanism to a higher location and rotation of the rotatable member in a second direction driving movement of the nut or moveable body to change the vertical position of the first end of the counterbalance mechanism to a lower position, and
• the nut or moveable body having a projection positioned within the groove of the receiving body such that the projection is mateable within the groove and prevents rotation of the nut or moveable body as the nut or moveable body is vertically moved along the rotatable member when the rotatable member rotates.