US Patent 7924566 Heat dissipation device

A heat dissipation device includes a heat sink in which a plurality of mounting holes are defined, and a plurality of fasteners. Each of the fasteners includes a shaft with one end thereof received in a corresponding mounting hole, a sleeve enclosing the shaft and received in the mounting hole, and a fixture engaging the shaft and pressing the heat sink and a bottom end of the sleeve. The sleeve is filled between the end of the shaft and an inner face of the heat sink defining the mounting hole to perform an engagement of the shaft in the mounting hole of the heat sink, thereby fastening the fasteners to the heat sink. The shaft has a screw extending out of the mounting hole for mounting the heat sink on a printed circuit board.