US Patent 9247815 Slide rail assembly

A slide rail assembly includes first, second, and third rails slidably connected together, a guiding base on the first rail, a first contact member on the second rail, and a second contact member on the third rail. The first contact member extends through an opening of the second rail and corresponds to the guiding base. When the third rail is pulled out, the second contact member, which corresponds to the first contact member, abuts against the first contact member such that the second rail is displaced with the third rail. Once the first contact member is guided by the guiding base to another position and separates from the second contact member, the third rail can be pulled out relative to the second rail.