| 摘要 |
<p>The sliding door operating mechanism comprises a belt (3) extending substantially horizontally above and beyond the door opening zone and around a pair of rollers (2) at least one of which is drivable. Mounting means (11) for said door are connected to the bolt (3) for translational movement therewith. The belt may be endless with two parallel opposite runs, and in the case where two doors are provided to close together, the mounting means (11) for each door are connected to the endless belt on each of said opposite runs. A safety switch is optionally provided. It comprises means fixed for movement with the door, and an arm attached to the belt (3). The means and the arm are so mounted one to the other that relative movement is possible between them should the door encounter an obstruction and the drive means continue. A switch contacted by the arm may operate either to reverse or to stop the belt drive. At each end of travel of a door, a first switch slows the door, and a record switch stop the door. Electrical power may be fed to the door via a ribbon-type multi-strand cable running in a cable tray above the door. <IMAGE></p> |
