Patent ID: 7304851

Claim:
A heat sink comprising a plurality of plate members arranged in a stack, said plate members each comprising a rectangular body, a first sidewall perpendicularly extending from a first side of said rectangular body, and a second sidewall perpendicularly extending from a second side of said rectangular body, wherein the rectangular body of each of said plate members has a mounting hole, said mounting hole having a big hole portion disposed adjacent to said first sidewall and a small hole portion, said big hole portion having a width greater than said small hole portion; said first sidewall has a lug extending from a bottom side thereof for insertion into the mounting hole of another one of said plate members, and a retaining portion, said lug having a head and a neck connected between said head and said first sidewall, said head having a width greater than the small hole portion of said mounting hole and not greater than the big hole portion of said mounting hole, said retaining portion being adapted to press on the lug of another one of said plate members and to partially engage into the big hole portion of the mounting hole of another one of said plate members.