Abstract: A height adjustable desk including a work bench which is height adjustable and supported upon a pair of upwardly extending legs. The leg includes an upper portion supported on a lower portion. A height adjustment mechanism is manipulated by the user to adjust the height of the upper portion. This motion is transferred to the upper portion of the leg by means of cooperating rack gears meshingly engaged with their associated pinion gears. A shaft couples the gears so that the upper portions move in unison. The height adjustment mechanism includes a cooperating worm gear and nut. The worm gear is supported by the upper portion, while the nut is mounted in the lower portion.

Abstract: A frame for a desk to support a work surface for height adjustment of the work surface. The frame includes a base frame consisting of a pair of vertical members which are generally parallel, co-extensive and transversely spaced. The vertical members of the base frame receive a pair of vertical members of a height adjustable sub frame. A rotatably driven first shaft causes vertical movement of an associated pair of vertical members on one side of the desk while vertical movement is transferred to the other side of the desk by a second shaft having gears which engage a rack gear on each of the vertical members of the sub-frame.

Abstract: A desk frame including a base consisting of a pair of vertically extending transversely spaced members, a sub-frame vertically movably adjustably supported by the base, and including a pair of vertically extending members telescopically received within the vertical members of the base, a drive assembly to move the subframe vertically relative to the base, the drive assembly including a rack gear attached to each vertical member of the sub-frame, a pinion gear meshingly engaged with each rack, with the pinion gears being rotatably supported by the base, a shaft extending between the two pinions to transmit rotary power therebetween, a worm gear meshingly engaged with one of the pinions, and rotatably supported by the base, a drive shaft fixed to the worm gear and extending therefrom to a position manually operable by a user of the desk, and wherein the drive shaft is also adapted to be supported by the sub-frame.