Height-adjustable table for work places with video screen

Claim 1

A height-adjustable stand for a work place with a video monitor and a keyboard, the stand having a pair of horizontally spaced opposite sides and comprising: respective back telescoping columns at the sides and provided with lower portions and upper portions vertically telescoping with said lower portions; a video-monitor table supported on the upper portions of the back columns and extending between the sides; respective front columns adjacent the back columns at the respective sides and having lower portions and upper portions telescoping within the latter lower portions; a keyboard plate supported on the upper portions of the front columns adjacent the video-monitor table; a horizontal crossbar connecting the lower portions of said columns on one of the sides with the lower portions of the columns of the other side of said stand, the upper portions of the columns supporting said video-monitor table being adjustable independently as to height with respect to the upper portions of the columns supporting the keyboard plate; and actuating means on said sides at least partly concealed by said columns for adjusting said upper portions, the actuating means including: respective upright front and back spindles at each of the sides, respective means coupling the front spindles to the upper portions of the respective front columns and the rear spindles to the upper portions of the respective rear columns for vertically displacing same on rotation of the respective spindles, front link means operatively connecting the front spindles together for joint rotation, rear link means operatively connecting the rear spindles together for joint rotation, respective driving shafts at the stand sides horizontally traversing both the upper and lower portions of the front columns, the upper portions of each front column being formed with a vertically elongated oblong hole through which the respective shaft passes and of a length at least equal to the travel of the respective upper portion, and means including an input gear on each of the shafts and an output gear at each of the sides on one of the respective spindles and meshing with the respective input gear for raising and lowering said upper portions of said columns, each of said lower portions fully enclosing the respective upper portion except where each upper portion stands out of the top of the respective lower portion.