The 'top hung' system is most often used. The door is hung by two trolley hangers at the top of the door running in a concealed track; all the weight is taken by the hangers, making the door easier to move.
At each end is a track stopper to absorb any impact made if the door is slammed and to hold the door in the open or closed position. All top hung sliding door gear systems have a maximum weight limit per pair of trolley hangers. When specifying a suitable sliding system the estimated weight of the door is a critical factor, although most suppliers of sliding door gear can advise on door weights
As the door is hung at the top from two points, it also needs a bottom track/stay roller to prevent it from swinging sideways. The most common type is called 'clear threshold guiding', a floor-fixed plastic guide about 60mm wide which is fixed below the door at the midpoint of its run. A groove is cut into the bottom of the door which runs over this guide, preventing lateral movement of the door. With a glass door the panel runs through the guide as illustrated. Because the door is always engaged in the guide, when the door is open the floor is clear, hence 'clear threshold'
Several examples of free-standing top-hung sliding-door wardrobes can be seen on several websites. The mechanisms are safe, and the bottom of the doors is held in place on tracks. The rollers also have safety locks that prevent the doors from jumping off the tracks. Additional features such as soft closers or dampners can be added to further enhance the feel and usability of these products
Credit: Wikipedia (Information on Top hung sliding doors)
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