Adjustable Height Standing Desk

Abstract

A height adjustable, standing desk suitable for use on conventional desks is presented. The standing desk of the present invention utilizes a scissor lift mechanism to raise and lower the desktop surface. The standing desk is presented in two embodiments, one of which uses a motor drive assembly to raise and lower the desktop and one of which uses is manually raised and lowered and features a biasing spring and height locking arrangement. Slide out and clip on keyboard assemblies are also presented.

1 . A height adjustable table, comprising:
 a base frame, an intermediate frame and an upper frame, wherein the base, intermediate and upper frames are parallel to each other and configured in a vertically spaced and aligned relationship;   wherein the base, intermediate and upper frames each include a frame member and wherein the frame member of the base, intermediate and upper frames are parallel to each other and vertically aligned;   a linkage assembly for maintaining the base, intermediate and upper frames in a generally parallel relationship relative to each other as the table moves between raised and lowered positions;   wherein the linkage assembly is pivotally connected at a first location and slidably connected at a second location to the frame member of each of the base, intermediate and upper frames; and   a drive assembly for raising and lowering the table, the drive assembly connected to the linkage assembly.   
     
     
         2 . The height adjustable table of  claim 1 , wherein the linkage assembly is:
 a scissor linkage comprising of a pair of lower links having lower and upper ends and a pair of upper links having lower and upper ends, the lower links being pivotally connected at about their mid-length, the upper links being pivotally connected at about their mid-length;   wherein one of the lower ends of the lower links is pivotally connected to the frame member of the base frame, and the other lower end of the lower links is slidably connected to the frame member of the base frame;   wherein one of the upper ends of the lower links is pivotally connected to one of the lower ends of the upper links and to the frame member of the intermediate frame, and the other upper end of the lower links is pivotally connected to the other lower end of the upper links and slidably connected to the frame member of the intermediate frame;   wherein one of the upper ends of the upper links is pivotally connected to the frame member of the upper frame, and the other of the upper ends of the upper links is slidably connected to the frame member of the upper frame; and   wherein the upper and lower link pivot connections on the frame member of the base, intermediate and upper frames are vertically aligned and the upper and lower link slideable connections on the frame member of the base, intermediate and upper frames are vertically aligned.   
     
     
         3 . The height adjustable table of  claim 1 , wherein the drive assembly for raising and lowering the table comprises:
 a ball screw assembly, the ball screw assembly being disposed adjacent and generally parallel to the linkage assembly;   a linkage arm, wherein the linkage arm interconnects the ball screw assembly and adjacent linkage assembly; and   a drive motor connected to one of the ball screw assemblies.   
     
     
         4 . The height adjustable table of  claim 3 , wherein the drive motor is an electric motor. 
     
     
         5 . The height adjustable table of  claim 3 , wherein for the ball screw assembly and adjacent linkage assembly, the linkage arm is rigidly connected to the lower link of the linkage assembly slidably connected to the frame member of the base frame and is pivotally connected to a nut of the ball screw assembly. 
     
     
         6 . The height adjustable table of  claim 5 , wherein the ball screw assembly is pivotally connected at one end and free to rotate in an arc at the other end in a plane generally parallel to the adjacent connected linkage assembly. 
     
     
         7 . The height adjustable table of  claim 1 , wherein the drive assembly is enclosed within a base connected to the base frame. 
     
     
         8 . The height adjustable table of  claim 1 , wherein the slidable connections between the lower and upper links and the frame member of the base, intermediate and upper frames include rollers fixed to the links which slide upon the frame members. 
     
     
         9 . The height adjustable table of  claim 1 , wherein the upper frame includes a top support surface or table top connected to the frame. 
     
     
         10 . The height adjustable table of  claim 1 , wherein the intermediate frame includes a support surface connected to the frame. 
     
     
         11 . The height adjustable table of  claim 1 , wherein the base frame includes a top support surface connected to the frame. 
     
     
         12 . The height adjustable table of  claim 7 , further including a pull-out keyboard tray in the base. 
     
     
         13 . A height adjustable table, comprising:
 a base frame, an intermediate frame and an upper frame, wherein the base, intermediate and upper frames are parallel to each other and configured in a vertically spaced and aligned relationship;   wherein the base, intermediate and upper frames each include a frame member and wherein the frame member of the base, intermediate and upper frames are parallel to each other and vertically aligned;   a linkage assembly for maintaining the base, intermediate and upper frames in a generally parallel relationship relative to each other as the table moves between raised and lowered positions;   wherein the linkage assembly is pivotally connected at a first location and slidably connected at a second location to the frame member of each of the base, intermediate and upper frames;   means for biasing the height-adjustable table in a normally raised position; and   means for adjusting the height of the height-adjustable table.   
     
     
         14 . The height-adjustable table of  claim 13 , wherein the means for biasing the height-adjustable table in a normally raised position comprises biasing springs interconnecting the upper ends of the upper links of the linkage assembly. 
     
     
         15 . The height-adjustable table of  claim 13 , wherein the means for adjusting the height of the table includes a pin mounted at the upper end of the upper link slidably connected to the frame member of the upper frame, the pin configured to selectively engage the frame member at predetermined height-adjustment locations. 
     
     
         16 . A height adjustable table, comprising:
 a base frame, an intermediate frame and an upper frame, wherein the base, intermediate and upper frames are parallel to each other and configured in a vertically spaced and aligned relationship;   wherein the base, intermediate and upper frames each include mutually opposed side members and wherein the side members of the base, intermediate and upper frames are parallel to each other and vertically aligned;   two linkage assemblies for maintaining the base, intermediate and upper frames in a generally parallel relationship relative to each other as the table moves between raised and lowered positions;   wherein one of the two linkage assemblies is pivotally connected at a first location and slidably connected at a second location to a side member of each of the base, intermediate and upper frames and the other linkage assembly is pivotally connected at a first location and slidably connected at a second location to an opposing side member of each of the base, intermediate and upper frames;   wherein each linkage assembly is a scissor linkage comprising a pair of lower links having lower and upper ends and a pair of upper links having lower and upper ends, the lower links being pivotally connected at about their mid-length, the upper links being pivotally connected at about their mid-length;   wherein one of the lower ends of the lower links is pivotally connected to the side member of the base frame, and the other lower end of the lower links is slidably connected to the side member of the base frame;   wherein one of the upper ends of the lower links is pivotally connected to one of the lower ends of the upper links and to the side member of the intermediate frame, and the other upper end of the lower links is pivotally connected to the other lower end of the upper links and slidably connected to the side member of the intermediate frame;   wherein one of the upper ends of the upper links is pivotally connected to the side member of the upper frame, and the other of the upper ends of the upper links is slidably connected to the side member of the upper frame;   wherein for each linkage assembly, the upper and lower link pivot connections on the side members of the base, intermediate and upper frames are vertically aligned and the upper and lower link slideable connections on the side members of the base, intermediate and upper frames are vertically aligned; and   a drive assembly for raising and lowering the table, the drive assembly connected to each of the linkage assemblies.   
     
     
         17 . The height adjustable table of  claim 16 , wherein the drive assembly for raising and lowering the table comprises:
 two ball screw assemblies, one of the ball screw assemblies being disposed adjacent and generally parallel to one of the linkage assemblies, the other ball screw assembly being disposed adjacent and generally parallel to the other linkage assembly;   two linkage arms, wherein one linkage arm interconnects one of the ball screw assemblies and adjacent linkage assemblies and the other linkage arm connects the other ball screw assembly and adjacent linkage assembly;   wherein for each ball screw assembly and adjacent linkage assembly, the linkage arm is rigidly connected to the lower link of linkage assembly slidably connected to the side member of the base frame and is pivotally connected to a nut of the ball screw assembly;   a means for synchronizing the two ball screw assemblies; and   a drive motor connected to one of the ball screw assemblies.   
     
     
         18 . The height adjustable table of  claim 17 , wherein the means for synchronizing the two ball screw assemblies is a chain and gear connection. 
     
     
         19 . The height adjustable table of  claim 5 , wherein each ball screw assembly is pivotally connected at one end and free to rotate in an arc at the other end in a plane generally parallel to the adjacent connected linkage assembly. 
     
     
         20 . The height adjustable table of  claim 16 , wherein the drive assembly is enclosed within a base connected to the base frame.