US005797666A [ii] Patent Number: 5,797,666  Date of Patent: Aug. 25, 1998
Primary Examiner—Peter M. Cuomo
Assistant Examiner—Gerald A. Anderson
Attorney, Agent, or Firm—Birch, Stewart, Kolasch & Birch,
A desk selectively used as a reading or computer desk is disclosed. The desk has a liftable monitor case that is movably received in the desk and selectively moves in vertical direction between monitor visible and nonvisible positions. In order to vertically move the above monitor case between the two positions, the desk according to an embodiment has an automatic case lifting device including a motor-driven pantographic link work. In the case lifting device, a movable nut along with a contact bracket engages with the output shaft of a reversible motor and horizontally reciprocates along the shaft by the rotating force of the shaft. The contact bracket horizontally moves between two positions where the bracket comes into contact with limit switches, respectively, to stop the motor. The reversible motor starts to extend or retract the link work when the keyboard drawer is fully drawn out or closed.
5 Claims, 8 Drawing Sheets