Abstract: In a high-security sliding-door apparatus for closing and opening a corridor, the door having (a) a door frame having a track and a bi-directional effector, (b) a carriage having track-engaging rollers, (c) a slide plate slidably secured to the carriage and driven by the effector, and (d) a controller controlling slide-plate movement and enabling the door to be continuously closed but not locked, the improvement comprising centering apparatus for relative positioning of the slide plate and carriage, the centering apparatus including (1) a yoke attached to the slide plate at a yoke pivot and having a yoke cam surface thereabove, (2) a carriage-attached yoke-cam follower, and (3) springs having proximal ends attached to the yoke spaced above the yoke pivot and distal ends each attached to the carriage at points offset from the yoke pivot in opposite lateral directions, centering the door with the slide plate when unlocked.

Abstract: In a high-security sliding-door apparatus for closing and opening a corridor, the door having (a) a door frame having a track and a bi-directional effector, (b) a carriage having track-engaging rollers, (c) a slide plate slidably secured to the carriage and driven by the effector, and (d) a controller controlling slide-plate movement and enabling the door to be continuously closed but not locked, the improvement comprising centering apparatus for relative positioning of the slide plate and carriage, the centering apparatus including (1) a yoke attached to the slide plate at a yoke pivot and having a yoke cam surface thereabove, (2) a carriage-attached yoke-cam follower, and (3) springs having proximal ends attached to the yoke spaced above the yoke pivot and distal ends each attached to the carriage at points offset from the yoke pivot in opposite lateral directions, centering the door with the slide plate when unlocked.

Abstract: A sliding door apparatus for closing and opening in a wall. The sliding door apparatus includes a sliding door having top and bottom edges, a door frame, a carriage secured to the top edge of the door and a drive mechanism for opening and closing movement of the door. The drive mechanism preferably includes a bi-directional effector, a power-storing power source and a controller configured to enable the door to be continuously closed but not locked when a continuously-closed signal is received by the controller.

Abstract: A sliding door apparatus for closing and opening in a wall. The sliding door apparatus includes a sliding door having top and bottom edges, a door frame, a carriage secured to the top edge of the door and a drive mechanism for opening and closing movement of the door. The drive mechanism preferably includes a bi-directional effector, a power-storing power source and a controller configured to enable the door to be continuously closed but not locked when a continuously-closed signal is received by the controller.