Patent ID: 7576989

Claim:
A heat sink assembly comprising: an unit comprising a heat sink adapted for attachment with a heat-generating electronic component mounted on a printed circuit board; a back plate adapted for being located below the printed circuit board; a plurality of pre-assembled fasteners respectively extending through the unit for fixing the unit to the back plate, each fastener comprising: a bolt comprising a head, a shaft extending from the head and a spring sleeved on the shaft, the shaft having an engaging portion at an end thereof; and a supporting clip located below a bottom of the unit, the supporting clip comprising a body snapping a lower portion of the shaft, and a supporting leg extending from the body adapted for abutting against the printed circuit board, wherein each bolt extends through the unit with its head downwardly pressing the spring to make it compressibly engages the bottom of the unit, and its engaging portion engaging with the back plate, the bottom of the unit abuts against the body of the supporting clip to be supported by the supporting clip, whereby a movement of the unit is prevented as an extension of the fastener through the unit and an engagement of the fastener with the back plate.