Fig. 121
The hangers most extensively used at present are the trolley type, of which the Coburn is the original and the best of the various kinds. The track, a typical section of which is shown in [Fig. 121], is made of sheet steel, which is bent or folded into various forms, depending on the particular make. The carrier is contained in the interior of the track. The several features of this type of track and hanger are illustrated in Figs. [122], [123], and [124], which likewise show the method of attachment and the detail construction of the door head, or soffit, necessary to receive these tracks and hangers.
This type of sliding-door trolley track is also sometimes lined with wood placed in the steel trough, or track, as shown in [Fig. 125]. This makes the device absolutely noiseless, although the regular types operate with very little noise. Besides the Coburn trolley and track, there are the Richard and the McCabe. Both of these makes possess merit. The trolleys, or carriers, are constructed with both fiber and iron wheels, with ball bearings, running on a wooden or metal track, according to the type.
Fig. 122
Fig. 123
Fig. 124