A drawer runner that can easily be installed and is able to bear heavy loads for the floor mounting of pharmacy cabinets has a carcass rail, a central rail and a pull-out rail. The pull-out rail is accommodated so that it can move in the central rail and, in turn, is accommodated so that it can move in the carcass rail in a nested manner, and is synchronized and damped.

A slide rail assembly includes a first rail, a second rail, a synchronization member, an auxiliary member and a third rail. The synchronization member is movably mounted on the second rail. The third rail is arranged with a working feature. During a process of the third rail being moved along an opening direction, the third rail is configured to drive the second rail to synchronously move by the working feature abutting against the synchronization member. During a process of the third rail and the second rail being synchronously moved along the opening direction, the blocking feature is configured to abut against the auxiliary member to move the auxiliary member relative to the second rail, in order to drive the synchronization member to move to no longer abut against the working feature, so as to unsynchronize movement between the third rail and the second rail.

A slide rail assembly includes two slide rails. During a process of a first one of the two slide rails being moved relative to a second one of the two slide rails along a predetermined direction, a first predetermined feature and a second predetermined feature are configured to contact each other to provide resistance in order to stop or slow down the relative movement between the two slide rails.

A returning mechanism and a slide rail assembly using the returning mechanism, which has a synchronous member disposed between a first engagement feature and a second engagement feature. When the synchronous member is displaced between the first end of the first engagement feature and the stroke of the second engagement feature, the synchronous member continues to abut against a first elastic body until the synchronous member is displaced to the second end of the second engagement feature to complete the return. When the synchronous member is between the stroke of the first engagement feature and the second end of the second engagement feature, the synchronous member continues to rest against the second elastic structure until the synchronous member moves to the first end of the first engagement feature to complete the return.

A slide rail device for a server case includes an outer rail unit, a middle rail unit and an inner rail unit. The outer rail unit includes an outer rail having outer first and second ends, and an outer abutting protrusion adjacent to the outer second end. The middle rail unit includes a middle rail slidable along the outer rail, and a detent member pivotably disposed on the middle rail. The detent member is in abutting engagement with the outer abutting protrusion to prevent sliding movement of the middle rail relative to the outer rail. The inner rail unit includes an inner rail slidable along the middle rail, and a releasing member moved to abut and press the detent member, during sliding movement of the inner rail, to make the detent member turn so as to release the detent member from the outer abutting protrusion.