Retainer device for heat sink assembly

A heat dissipating assembly, comprising:

• a circuit board;
• an electronic device mounted on the circuit board;
• a heat sink attached to the electronic device;
• a retention module attached to the circuit board and accommodating the electronic device, the retention module having a base frame and a plurality of posts extending upwardly from the base frame;
• a clamp hingedly attached to a rear of the retention module, a hook depending from a front of the clamp;
• and
• a crank pivotably attached to a front of the retention module, the crank pivotably and transversely retained in two frontmost posts of the retention module, the crank having a offset pressing portion, two pivot arms at opposite ends of the pressing portion, and an operation rod extending from one end of one of the pivot arms, wherein
• when the operation rod extends away from the heat sink, the offset pressing portion of the crank is at a highest position;
• and when the operation rod is pivoted to a position alongside the heat sink, the offset pressing portion of the crank is at a lowest position and presses the hook of the clamp.

A retainer device assembly comprising:

• a substrate;
• a retention module positioned upon said substrate and defining therein a cavity with a device located therein;
• a clamp pivotally mounted on one side of the retention module with a fastening portion at thereof a distal end far away from a pivotal axis of said clamp;
• and
• a crank being constantly assembled to the other side of the retention module opposite to said side the retention module while being moveable in upper and lower positions;
• wherein
• in assembling first said crank is located in the upper position, and thus said fastening portion is allowed to pass by said crank without interference so that the clamp is able to be initially loosely sits upon the devices;
• successively said crank is moved to be located in the lower position to press against the fastening portion thereunder so that the clamp finally tightly abuts against the device for reliable retention of the device relative to the retention module.