Synchronic drawer slide rail system with mute springback function

A synchronic drawer slide rail system with a mute springback function, comprising:

• two slide rail units, wherein two external faces of a drawer are connected to two internal faces of a cabinet in a relative sliding form through the slide rail units which are symmetrically arranged;
• the two slide rail units are synchronically connected to each other through a synchronizing mechanism;
• wherein each of the slide rail units comprises an outer rail, a middle rail and an inner rail;
• the outer rail is connected to the inner rail through the middle rail in a sliding form, and the inner rail is fixed on one of exterior faces of the drawer;
• wherein a shell unit is fixed on each of the two internal faces of the cabinet;
• a linear groove extending along a relative sliding direction of the drawer and the cabinet is provided on a side face, which faces the drawer, of the shell unit;
• each of the slide rail units is installed in the linear groove;
• a horizontal board extending towards the drawer is arranged at a bottom face of the shell unit, and a rack is provided on an inner end of the horizontal board;
• a down-facing groove is formed between a bottom groove wall of the linear groove and the rack, and a slide rail springback mechanism is installed in the down-facing groove;
• wherein a rear end positioning board is arranged at a rear end of the linear groove of the shell unit, two side face positioning boards are arranged on an upper side groove wall and a lower side groove wall of the down-facing groove respectively and extend oppositely;
• the outer rail of each of the slide rail units is stuck in the linear groove, and the inner rail faces a side face of the drawer;
• a square through hole is drilled on the outer rail;
• an elastic hook is correspondingly provided at a bottom of the linear groove of the shell unit, and the elastic hook is engaged with the square through hole;
• the outer rail is limited by the rear end positioning board, the side face positioning boards and the elastic hook;
• wherein a riveting round hole is drilled on the outer rail of each of the slide rail units;
• an avoid hole is drilled on the shell unit at a position corresponding to the riveting round hole;
• the outer rail of each of the slide rail units is riveted with the shell unit by a stainless steel positioning rivet passing through the riveting round hole and the avoid hole;
• the stainless steel positioning rivet extends out of an external face of the shell unit and cooperates with an installing hole on each of the internal faces of the cabinet for positioning;
• wherein the slide rail springback mechanism comprises a springback body, a slider, a toggle, a damping device and a spring;
• the springback body is mounted on the down-facing groove, the toggle is mounted on an internal wall of the inner rail, and a guiding structure is provided on the springback body;
• the damping device and a rear end of the spring are mounted on the springback body, and the damping device is parallel to the spring;
• a front end of a damping rod of the damping device and a front end of the spring are respectively connected to the slider;
• the slider is installed on and movable along the guiding structure;
• the toggle cooperates with the slider to move the slider along the guiding structure.