US Patent 10213017 Slide rail assembly

A slide rail assembly comprises a first rail, a second rail, a third rail and an engaging member. The first rail comprises a releasing feature. The second rail is movable relative to the first rail. The third rail is movable relative to the second rail. The engaging member is pivoted to the second rail. Wherein, the engaging member is configured to engage with the third rail to allow the second rail and the third rail to be synchronously moved relative to the first rail along a first direction, and the releasing feature is configured to disengage the engaging member from the third rail when the second rail is synchronously moved with the third rail relative to the first rail to a predetermined position.