Height adjustable counterbalance workstation

A height adjustable workstation comprising a planar work surface supported by opposed leg assemblies, each leg assembly including a base leg and an upper leg having a variable overlap with said base leg to vary the height of the planar work surface, a transmission system connecting said leg assemblies, said transmission system included a loaded torsion spring held at one end with the other end of said torsion spring winding or unwinding said torsion spring as the extent of overlap of said leg varies, said torsion spring cooperating with said transmission system to provide a counterbalance force opposing a downward force tending to increase the overlap of said legs, a hand engaging adjustment mechanism for varying the extent the torsion spring is wound and thereby vary the counterbalance force, and a locking mechanism for fixing said leg assemblies in a selected position when said locking mechanism is locked and allowing adjustment of the height of the work surface when said locking mechanism is released.