Abstract: A three-sectional hidden sliding rail includes a pair of sliding rail sub-mechanisms symmetrically mounted at a left and a right side of a movable object. Each sliding rail sub-mechanism includes a fixed guide rail, a middle rail, and a movable guide rail. The fixed guide rail is mounted on a fixed object. The movable guide rail is mounted on a side surface of the movable object. The fixed guide rail and the movable guide rail (3) have a sliding guide groove. An upper and a lower end of the middle rail are mounted in the sliding guide grooves of the movable guide rail and the fixed guide rail. The middle rail is able to slide along the sliding guide groove of the fixed guide rail (1), and the movable guide rail is able to slide along the middle rail (2). The sliding rail sub-mechanisms are connected through a synchronous mechanism.

Abstract: A three-sectional hidden sliding rail, which is able to solve a usage problem influenced by asynchronous sliding rails at two sides of a conventional three-sectional hidden sliding rail during using, includes a pair of sliding rail sub-mechanisms which is symmetrically mounted at a left side and a right side of a movable object. Each sliding rail sub-mechanism includes a fixed guide rail (1), a middle rail (2), and a movable guide rail (3). The fixed guide rail (1) is mounted on a fixed object through a fixed guide rail bracket (4). The movable guide rail (3) is mounted on a side surface of the movable object through a movable guide rail bracket (5). The fixed guide rail (1) and the movable guide rail (3) both have a horizontally parallel sliding guide groove. An upper end and a lower end of the middle rail (2) are respectively mounted in the sliding guide grooves of the movable guide rail (3) and the fixed guide rail (1).