Patent ID: 8132875

Claim:
A three-sectional sliding rail structure comprising: a retainer, being a of a C-shape with two slots, and having two stopping blocks longitudinally arranged between the slots; a first sliding unit, being slidably engaged within the slots of the retainer, being capable of sliding out to protrude from the retainer, and having two parallel grooves, wherein a mechanical switch linking a latch and a bidirectional stopping unit are separately fixed at two ends of the first sliding unit, both the mechanical switch with the latch and the bidirectional stopping unit are on the same side facing the retainer, and the bidirectional stopping unit will be stopped by either of the stopping blocks when the first sliding unit is slid out or in the retainer; and a second sliding unit, being slidably engaged within the grooves of the first sliding unit, being capable of sliding out to protrude from the first sliding unit, and having a positioning groove with two positioning recesses facing the first sliding unit, wherein the mechanical switch will be triggered by either of the positioning recesses to make the positioning recess unidirectionally locked by the latch when the second sliding unit is slid out or in the first sliding unit.