Patent ID: 7503531

Claim:
A height adjusting mechanism for a keyboard, wherein the keyboard comprises a casing which is adapted for being disposed on a flat surface, the height adjusting mechanism being adapted for adjusting a height of the casing from the flat surface, and comprising: a fixing piece fixed onto the casing and comprising a container and at least a supporting part, wherein the container passes through the casing and the supporting part is disposed on the inner wall of the container; a cylinder having at least a portion disposed inside the container, wherein the cylinder has a spiral guide configured at an sidewall thereof and the supporting part forms a sliding engagement with the cylinder; a first gear fixed to an end face of the cylinder; and a second gear meshed with the first gear, wherein rotating the second gear will drive and rotate the first gear and the cylinder so that the supporting part will slide along the spiral guide to change the length of the cylinder protruded from the casing, and an end of the cylinder protruded from the casing is in contact with the flat surface.