Adjustable computer keyboard support mechanism

An adjustable platform assembly for attachment of a generally horizontal platform to a generally horizontal work surface and providing means for transporting said platform between a work position and a storage position, comprising in combination:

• a first member supported by said work surface defining a first substantially horizontal axis;
• a second member for attachment to said platform said second member defining a second substantially horizontal axis substantially parallel to the first horizontal axis;
• a support arm pivotally connected at its opposite ends to the first member and the second member;
• and
• a compensating means associated with the support arm for altering the orientation of the platform with respect to the support arm when the second member is rotated about the first substantially horizontal pivot axis between the work position and the storage position, said compensating means comprising:
• a first gear mechanism attached to the first member;
• a second gear mechanism attached to the second member such that rotation of said second gear mechanism causes said platform to rotate about said second substantially horizontal axis;
• and
• means for linking the second gear mechanism with the first gear mechanism, whereby when the second member is rotated about the first substantially horizontal axis, the means for linking causes the second gear mechanism to rotate the platform such that the orientation of the platform with respect to horizontal is substantially unchanged.