Patent attributes
A multi-rail concealed slide rail structure includes an outer rail, a first ball retainer, a middle rail, a pair of second ball retainers, and an inner rail. One side of the outer rail is bent inward to form a first track for the first ball retainer to slide thereon. Two side edges of the middle rail are bent in the same direction to form second tracks, respectively. The middle rail is fitted on the first ball retainer, such that the first ball retainer leans against one of the second tracks. The pair of second ball retainers is movably fitted on the middle rail. One side edge of the inner rail is bent inward to form a third track corresponding to the second tracks. The inner rail is fitted on the pair of second ball retainers. Two parallel tracks are provided between the inner rail and the middle rail.
