Support structure for display

1 . A support structure for supporting a display, the support structure comprising:

a base element;

an arm rotatably coupled to the base element, the arm defining a longitudinal axis extending between a first end of the arm and a second end of the arm;

a head for movably supporting the display on the arm; and

a linkage assembly movable along the longitudinal axis, the linkage assembly including a spring having a plurality of spring constants configured to generate a force that counteracts a weight of the display to maintain the display in a plurality of positions relative to a surface.

2 . The support structure of claim 1 , wherein the linkage assembly is configured to maintain a consistent orientation of the head relative to the surface when the arm is adjusted to the plurality of positions.

3 . The support structure of claim 1 , wherein the linkage assembly includes a slider, a first link pivotally connected to the base element and the slider, and a second link pivotally connected to the slider and the head.

4 . The support structure of claim 3 , wherein the spring is positioned in the slider.

5 . The support structure of claim 4 , wherein the spring is configured to apply a force against the slider to counteract the weight of the display to automatically maintain the display above the surface.

6 . The support structure of claim 3 , wherein the slider, first link, and second link form a three-bar linkage configured to maintain a consistent orientation of the head relative to the surface when the arm is adjusted to the plurality of positions.

7 . The support structure of claim 1 , wherein the spring includes a first portion having a first spring constant and a second portion having a second spring constant that is greater than the first spring constant, and wherein the second spring constant is positioned closer to the head than the first spring constant.

8 . The support structure of claim 1 , wherein the head includes a joint body movably connected to the arm, the joint body pivotally connected to the linkage assembly.

9 . The support structure of claim 8 , wherein the joint body and the linkage assembly are configured to convert the linear movement of the linkage assembly to rotational movement of the joint body.

10 . The support structure of claim 8 , wherein the head further includes a pan head movably received in the joint body and a ring movably supporting the display on the arm.

11 . The support structure of claim 10 , wherein the ring is slidable within the pan head to adjust a tilt of the display, and wherein the pan head is rotatable relative to the joint body to adjust a pan angle of the display.

12 . The support structure of claim 1 , wherein the spring includes a first portion having coils of a first pitch to provide a first spring constant and a second portion having coils of a second pitch different from the first pitch to provide a second spring constant different from the first spring constant.

13 . The support structure of claim 1 , wherein the spring includes a first portion having a first spring constant and a second portion having a second spring constant that is greater than the first spring constant, and wherein the first portion is positioned closer to the head than the second portion.

14 . The support structure of claim 1 , further comprising an adjustment screw for adjusting the force generated by the spring.

15 . A support structure for supporting a display, the support structure comprising:

a base element;

an arm coupled to the base element, the arm extending along a longitudinal axis between a first end and a second end;

a head for movably supporting the display on the arm; and

a linkage assembly including

a slider movable along the longitudinal axis,

a first link pivotally connected to the base element and the slider,

a second link pivotally connected to the slider and the head, and

a spring positioned in the slider,

wherein the spring includes a first portion having a first spring constant and a second portion having a second spring constant that is greater than the first spring constant, and

wherein the second spring constant is positioned closer to the head than the first spring constant.

16 . The support structure of claim 15 , wherein the linkage assembly is configured to automatically maintain a consistent orientation of the head relative to a surface when the arm is adjusted to a plurality of positions.

17 . The support structure of claim 16 , wherein the spring applies a force against the slider to counteract the weight of the display to automatically maintain the display above the surface.

18 . The support structure of claim 17 , further comprising an adjustment screw for adjusting the force of the spring against the slider.

19 . The support structure of claim 15 , wherein the head includes a joint body pivotally coupled to the second link, and wherein the joint body and the linkage assembly are configured to convert the linear movement of the linkage assembly to rotational movement of the joint body.

20 . The support structure of claim 15 , wherein the first portion has coils of a first pitch to provide the first spring constant and the second portion has coils of a second pitch different from the first pitch to provide the second spring constant.

21 . The support structure of claim 15 , wherein the slider, first link, and second link form a three-bar linkage configured to maintain a consistent orientation of the head relative to a surface when the arm is adjusted to a plurality of positions.

22 . A support structure for supporting a display, the support structure comprising:

an arm extending along a longitudinal axis between a first end and a second end;

a tilt head rotatably coupled to a first end of the arm, the tilt head including

a joint body movably connected to the support structure,

a pan head received in the joint body and movable relative to the joint body, and

a ring received in the pan head, the ring movable with the pan head to adjust the display to a plurality of different tilt angles, the ring rotatable relative to the pan head to adjust the display to a plurality of different rotational angles relative to a surface; and

a linkage assembly positioned in the arm and coupled to the tilt head, the linkage assembly configured to rotate the tilt head when the arm rotates to counteract the rotation of the arm and maintain a consistent orientation of the tilt head.

23 . The support structure of claim 22 , wherein the linkage assembly includes a spring having a plurality of spring constants configured to generate a force that counteracts a weight of the display to maintain the display in a plurality of positions relative to a surface.

24 . The support structure of claim 23 , wherein the spring includes a first portion having coils of a first pitch to provide a first spring constant and a second portion having coils of a second pitch different from the first pitch to provide a second spring constant different from the first spring constant.

25 . The support structure of claim 23 , further comprising an adjustment screw for adjusting the force generated by the spring.

26 . The support structure of claim 22 , wherein the pan head includes a first portion and a second portion coupled to first portion, wherein the first portion and the second portion together define a channel for receiving the ring.

27 . The support structure of claim 26 , further comprising a screw threadably coupled to the pan head, wherein the screw is configured to adjust the ring between a first configuration and a second configuration.

28 . The support structure of claim 27 , wherein the ring is movable in the channel under a first frictional force in the first configuration, and wherein the ring is movable in the channel under a second frictional force greater than the first frictional force.

29 . The support structure of claim 22 , wherein the linkage assembly includes a three- bar linkage.