Three-section linkage drawer slides apparatus

A three-section linkage drawer slides apparatus, comprising:

• an upper rail;
• a middle rail;
• a fixed rail;
• an upper linkage rack;
• and
• a lower linkage rack;
• wherein the middle rail is slidably connected to the fixed rail through the lower linkage rack;
• the upper rail is slidably connected to the middle rail through the upper linkage rack;
• the upper linkage rack and the lower linkage rack are of separate structures;
• the upper linkage rack is mounted between the middle rail and the upper rail after being assembled;
• and the lower linkage rack is mounted between the fixed rail and the middle rail after being assembled;
• wherein the upper linkage rack comprises a first upper wheel frame, a second upper wheel frame, and an upper linkage rack body;
• the first upper wheel frame and the second upper wheel frame are respectively detachably connected to front and rear ends of the upper linkage rack body;
• the first upper wheel frame and the second upper wheel frame are respectively provided with an upper wheel at upper portions thereof;
• the first upper wheel frame and the second upper wheel frame are respectively provided with a ball wheel on left and right side portions thereof;
• and the upper wheel and the ball wheel are positioned between the upper rail and the middle rail;
• wherein the front and rear ends of the upper linkage rack body are provided, respectively, with a clamping groove and a limiting block provided at an opening of the clamping groove;
• the first upper wheel frame and the second upper wheel frame, at ends facing the upper linkage rack body, are respectively provided with a limiting protrusion matched with the clamping groove;
• and when the first upper wheel frame and the second upper wheel frame are respectively connected to the front and rear ends of the upper linkage rack body, the limiting protrusions of the first upper wheel frame and the second upper wheel frame slide into the clamping grooves through the limiting blocks at two ends of the upper linkage rack body respectively to be fixed;
• and
• wherein the lower linkage rack comprises a first lower wheel frame, a second lower wheel frame, and a lower linkage rack body;
• the first lower wheel frame and the second lower wheel frame are respectively detachably connected with two ends of a left side portion of the lower linkage rack body;
• and a large wheel is provided on side portions, facing the lower linkage rack body, of the first lower wheel frame and the second lower wheel frame;
• a middle wheel is provided at both an upper portion and a bottom portion of the first lower wheel frame and the second lower wheel frame, respectively;
• a small wheel is provided at two ends, opposite the first lower wheel frame and the second lower wheel frame, of a right side portion of the lower linkage rack body, respectively;
• and the large wheel, the middle wheel and the small wheel are arranged between the fixed rail and the middle rail.