Patent ID: 8240788

Claim:
A hidden self-closing drawer slide assembly comprising: a base formed with a receiving chamber and a slide groove in communication with the receiving, chamber, one end of the slide groove away from the receiving chamber being folded into a positioning portion, an edge of the base being formed with a protruding hook; a pressure cylinder received in the receiving chamber of the base and provided with a retractable piston rod, the retractable piston rod extending out of the pressure cylinder and slidably received in the slide groove of the base, and one end of the retractable piston rod extending out of the pressure cylinder being formed with a concave locking portion; a traction member including a flat board formed with a driving portion which consists of a first restricting protrusion and a second restricting protrusion, between the first and second restricting protrusions being formed a first locking space, on the flat board being disposed a guiding block and a pin, and an edge of the flat board adjacent to the guiding block extending outward to form a locking protrusion, the traction member being mounted on the base in such a manner that the guiding block is movably received in the slide groove of the base, and the locking protrusion is engaged in the locking portion of the piston rod of the pressure cylinder; and a spring with two ends hooked to the hook of the base and the pin of the traction member, respectively; wherein the hidden self-closing drawer slide assembly is mounted on a stationary rail and used together with a slide rail, the slide rail slidably mounted on the stationary rail is provided at one side thereof with a driving pin and connected to a drawer, and the driving pin is to be engaged in the first locking space of the traction member.