Patent ID: 8245761

Claim:
A heat sink comprising: a plurality of metal fins interconnected together, each of the metal fins comprising: a main plate; at least one flange extending forwardly from the main plate, the at least one flange having a rear edge connecting with the main plate and an opposite front edge; and at least one interlocking unit formed on the at least one flange, the at least one interlocking unit comprising an engaging ear and a hook, the engaging ear extending rearwards from the rear edge of the at least one flange and defining a locking hole therein, the at least one flange defining a cutout adjacent to the front edge thereof corresponding to the engaging ear, the cutout being aligned with the engaging ear and recessed rearwards from the front edge of the at least one flange, the hook extending forwardly from the at least one flange and being located within the cutout, the hook being L-shaped, and comprising an inner extending portion connecting with the at least one flange and an outer clasping portion bent upwardly from a free end of the extending portion, the extending portion of the hook being depressed downwardly and having a height lower than the at least one flange, the clasping portion of the hook of the adjacent rear fin being engaged in the locking hole of the engaging ear of the fin; wherein the engaging ear of a fin is engaged in the cutout of an adjacent rear fin, and the hook of the adjacent rear fin is engaged in the locking hole of the engaging ear of the fin.