Patent ID: 6918564

Claim:
A support apparatus for height-adjustably supporting a display device, comprising: a first support unit having a first engaging device; a constant force spring having one end affixed on said first support unit; and a second support unit being movably received in said first support unit, the second support unit comprising a second engaging device, a first end, and a second end, the first end touching against said constant force spring and the second end adapted to be connected to said display device; wherein said support apparatus exhibits a first length when said second engaging device of the second support unit engages with said first engaging device of the first support unit, and said second support unit moves to a predetermined position making said support apparatus exhibits a second length when an external force is exerted on said constant force spring, and wherein the first length is larger than the second length; and wherein said constant force spring provides a constant force to balance the weight of display device and friction within the support apparatus when said support apparatus exhibits a length between the first length and the second length.