Patent ID: 7048236

Claim:
A vertical adjustment apparatus attachable to a workstation by a keyboard mechanism, the apparatus comprising: a base tray attachable to the keyboard mechanism; an upper tray to support a device at an adjustable height above the base tray; a first leg having an upper end pivotally attachable to the upper tray and a lower end slidable along the base tray; a second leg having a lower end pivotally attachable with the base tray and an upper end slidably attachable with the upper tray, wherein the adjustable height may be adjusted from a first height to accommodate a user utilizing the device in a seated position, to a second height to accommodate the user in a standing position; and locking means to selectively lock the upper tray at a predetermined height above the base tray, the locking means having a member pivotally attached to the second leg, the member having at least one notch; and a post in the first leg to selectively engage said at least one notch to selectively lock the upper tray at a predetermined height.