| 摘要 |
<p>A carriage adapted to be slideably mounted on a track comprises a main body having a pair of retaining elements adapted for lateral movement therein. Each turning element is biased inwardly to allow the carriage to be mounted on and removed from a channel formed in the track. A pivotally mounted knife element is adapted to engage each retaining element thereby moving said retaining element outwardly to a position in which they engage the side edges of the channel formed in the track, thereby securing the carriage to the track. <IMAGE></p> |
