Heat sink assembly retainer for electronic integrated circuit package

A heat sink assembly for being mounted on a circuit board module, comprising:

• a heat sink having a base plate mounted on a top side of the circuit board module and a plurality of fins extending upwardly from a top surface of the base plate;
• and
• a retainer device for retaining the heat sink to the circuit board module and including a backing plate disposed on a bottom side of the printed circuit board module, the printed circuit board module having a plurality of positioning voids, and the backing plate having a plurality of clasping members extending through the corresponding positioning voids of the module, the retainer device further including a fastening frame installed around the heat sink on an opposite side of the printed circuit board module and clasped by the backing plate, the fastening frame including an operation lever, the operation lever including an operational body, a plurality of arms extending downward from the operational body, a plurality of pivot axles pivotally engaging with the fastening frame and a plurality of urging portions connecting the pivot axles and the arms, the operation lever being rotatable about the pivot axles to cause the urging portions to move to press the base plate of the heat sink under a condition that the clasping members respectively engage corresponding locking holes of the fastening frame in tension so as to have the base plate of the heat sink and the printed circuit board module abut against each other.

A heat sink assembly comprising:

• a printed circuit board module with a CPU on an upper side thereof;
• a backing plate positioned on an underside of said module;
• a heat sink positioned on the CPU;
• and
• a fastening frame positioned on said upper side of the printed circuit board module and surrounding the heat sink, said fastening frame secured to the backing plate to sandwich the module therebetween, a pivotal lever positioned on the fastening frame, said pivotal lever including an urging portion which is spaced from the heat sink when the pivotal lever is in an upstanding position while abuts against the heat sink when the-pivotal lever is in a horizontal position.