Adjustable computer keyboard support mechanism

An adjustable platform support assembly for attachment of a platform to a work surface and providing means for transporting said platform between a work position and a storage position while maintaining the same orientation of the platform relative to the work surface comprising in combination:

• a first member for attachment to said work surface including a first substantially horizontal axis;
• a second member for attachment to said platform and including a second substantially horizontal axis substantially parallel to the first horizontal axis;
• a support arm pivotally connected at its opposite ends respectively to the first member and the second member;
• and
• a compensating means attached to the ends of 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 to maintain the same orientation of the platform, said compensating means including said support arm being journalled at one end to the first member for rotation about the first horizontal axis and attached at the other end to the second member for rotation of the second member about the second axis, said compensating means further including a mechanical linkage from the support arm connection to the first member movable in unison with the support arm movement about the first axis, said linkage connected to the second member at the second axis for rotation of the second member proportional to the rotation of the support arm about the first axis to thereby maintain the platform in the same orientation as the platform and support arm are moved about the first pivot axis.