Slide rail mechanism

A slide rail mechanism applicable to a rack, comprising:

• a first carried object;
• a first slide rail assembly comprising a first rail and a second rail longitudinally movable relative to the first rail, wherein the first rail is configured to be mounted to the rack, and the second rail is configured to carry the first carried object;
• a second slide rail assembly arranged on the first carried object, the second slide rail assembly comprising a third rail and a fourth rail longitudinally movable relative to the third rail, wherein the third rail is configured to be mounted to the first carried object, and the fourth rail is configured to carry a second carried object;
• and
• a locking member movably mounted to the first carried object;
• wherein the first rail is arranged with an auxiliary feature, and the locking member is arranged with a predetermined part and a locking part;
• wherein when the second rail is located at a retracted position relative to the first rail, the auxiliary feature is configured to support the predetermined part to position the locking member at a first predetermined position, such that the locking part of the locking member is not configured to prevent the fourth rail from being moved along an opening direction, in order to allow the second carried object to be moved relative to the first carried object along the opening direction;
• wherein during a process of the second rail being moved relative to the first rail along the opening direction to an extended position, the locking member is moved from the first predetermined position to a second predetermined position, such that the locking part of the locking member is configured to prevent the fourth rail from being moved along the opening direction, in order to limit a moving distance of the second carried object relative to the first carried object along the opening direction.