Fig. 125
Fig. 126
This type of hanger and track is made in all sizes, from the smallest, for hanging small bookcase doors, up to the very largest, for warehouse doors. As shown in [Fig. 126], trolley hangers are made for doors of special design, such as accordion and parallel doors used to close up large openings. They are also made for elevator doors, freight-car doors, barn doors, and automatic fire-doors, with special construction to suit the various purposes.
Fig. 127