Adjustable desk apparatus

An adjustable desk apparatus configured to selectively sit on top of a primary work surface, comprising:

• a base member coupled to the primary work surface;
• a first adjustment assembly operatively coupled to said base member;
• an auxiliary work surface operatively coupled to said first adjustment assembly, said first adjustment assembly being configured to selectively move said auxiliary work surface between a sitting configuration adjacent to the primary work surface and a standing configuration upwardly displaced from the primary work surface;
• wherein:
• said base member includes a generally vertical first stanchion;
• and
• said auxiliary work surface includes a first carriage configured to move up and down said first stanchion when said auxiliary work surface is moved between said sitting configuration and said standing configuration, respectively;
• wherein said first adjustment assembly includes:
• a pair of opposed counterweight sprockets coupled to said base member;
• a first timing member coupled to a counterweight and operatively coupled to said auxiliary work surface so as to selectively urge said auxiliary work surface upward toward said standing configuration when said first timing member is coupled to said pair of sprockets.