Patent ID: 8556305

Claim:
A locking/unlocking apparatus for a drawer being applicable to be assembled on a fixed slide rail and a slidable slide rail of a drawer, the automatic locking/unlocking apparatus comprising: a drive element being formed on the slidable slide rail and including a drive portion; a main body being fixed on the fixed slide rail and including a rail groove, a bar hole formed in a bottom surface of the rail groove, a slot which is formed above the bar hole and will deform when being pressed, and an annular guide groove in communication with the rail groove, the annular guide groove including an internal annular surface and an external annular surface connected to a groove surface of the rail groove, the internal annular surface including a concave portion, the external annular surface including a protruding portion in alignment with the concave portion; a slide block including a first protrusion to be pushed by the drive portion of the drive element, a second protrusion to be pushed by the drive portion of the drive element, a first protruding cylinder which is slidably disposed in the rail groove and engaged in/disengaged from the concave portion of the annular guide groove, and a second protruding cylinder which is slidably disposed in the rail groove; and a spring including a first end connected to the main body, and a second end connected to the slide block.