Abstract: A utility cart having detachable and reversible shelves comprising a pair of end frames each having a pair of elongated rigidly connected upright hollow supports which are parallel and spaced apart. A horizontal orthogonal shelf device is detachably secured at the corners to said upright supports. One shelf device includes a flat bottom and two transverse flanges on opposite parallel side edges to provide a partial closure, the opposite ends being open. A mounting bracket is secured to each end of each flange and has an attaching portion projecting angularly inwardly. Each attaching portion engages the respective upright support at a point within the angle defined by the shelf corner. Each support is further provided at such engagement point with a threaded opening through one wall thereof. A screw is received through an opening in each bracket and is threaded into the threaded opening for securing the shelf device to the upright supports.

Abstract: An adjustable typewriter platform mechanism is provided for use with a desk of the type having a typewriter platform recess in the desk top. The typewriter platform mechanism includes a U-shaped base plate which is horizontally mounted at a spaced distance below the desk top. Four vertically disposed jack-screws are rotatably journalled between the base plate and the desk top for nontranslational rotation; and means is provided for simultaneously rotating all of the jack-screws.A pair of parallel spaced and horizontally disposed support-bars are mounted to respective ones of the jack-screws to receive lifting motion therefrom. Limited relative horizontal movement between the support-bars and the jack-screws is permitted in two horizontal and orthogonally intersecting axes; and means is provided for vertically guiding the support-bars in one vertical plane to minimize relative movement between the support-bars and the jack-screws in one of the aforesaid horizontal axes.