US Patent 9992906 Slide rail assembly and operation method thereof

A slide rail assembly includes first to third rails and an engaging mechanism movably mounted on the second rail. The second rail is displaceable with respect to the first rail, and the third rail is displaceable with respect to the second rail. The three rails define a length when the second rail is displaced from a first to a second position in a first direction and the third rail, to a third position in the same direction, extending out of the second rail. Once the second rail is displaced from the second to a fourth position in a second direction, the length is reduced, and the second rail is kept at the fourth position by the engaging mechanism.