Patent ID: 8690267

Claim:
A casing for assembling a drawable device, the drawable device being inserted into the casing, the casing comprising: a plurality of plates and an assembly unit; wherein the assembly unit comprises: a fixing member disposed on a side wall of the drawable device and having a fixing hole; a latching member slidably disposed on one of the plates corresponding to the fixing member; wherein a first tongue portion is formed on the one of the plates and corresponds to the latching member, wherein the first tongue portion has a free end and a fixing protrusion formed substantially near to the free end and protruding toward the interior of the casing; and wherein the fixing protrusion engages with the fixing hole when the drawable device is assembled to the casing, wherein said one of the plates has at least one pair of corresponding track portions, the first tongue portion has two corresponding extending protrusions, the latching member includes a main body having at least one pair of side portions for slidably engaged with the pair of track portions at two sides thereof, and the main body has two sliding slopes respectively corresponding to the two extending protrusions; wherein each of the extending protrusions slides along the corresponding sliding slope for lifting the first tongue portion away from the drawable device when the latching member is forced to slide, thereby the fixing protrusion disengages with the fixing hole and the drawable device can be drawn away from an insertion opening of the casing.