1. Technical Field
The disclosure generally relates to heat dissipation, and more particularly to a heat sink assembly mounted by a clip onto an electronic package.
2. Description of Related Art
A heat sink is usually placed in thermal contact with an electronic package such as a central processing unit (CPU), and transfers heat through conduction away from the electronic package to prevent overheating thereof. The heat sink is secured to the electronic package by a clip.
A related heat sink clip, shown in US Patent Application Publication No. 2005/0144764A1, includes a pressing member, an engaging member and a handle. The pressing member includes an elongated elastic section with a bend at an end thereof. The bent end defines an engaging hole therein for engaging a jut of a base which surrounds the electronic package. A slot is defined in an opposite end of the elastic section. The engaging member at an end thereof has a joining part which is provided with a fitting hole for receiving another engaging jut of the base. The engaging member at an opposite end thereof has a protrusion which passes through the slot. The handle at an end thereof, pivotally connected with the protrusion, is provided with a cam. The handle at an opposite end thereof has a pressing part to pivot the handle relative to the engaging member and extends laterally to define an extension section.
In securing the heat sink to the base, the handle at the pressing part is depressed to pivot the handle with respect to the pivotal joint of the handle and the engaging member. The extension section provides a hook end to fasten to a lateral side of the base. The cam presses the pressing member such that the elastic section generates tensile deformation against the heat sink to secure the heat sink to the electronic package.
However, to generate a downward pressing force against the heat sink via the heat sink clip, it is necessary to press the handle downwardly with the cam pressing the pressing member to thereby secure the engaging member to the base. Pressing the handle into position requires a relatively large force, and it is not easy to mount the engaging member onto the base.
Therefore, there is a need for a heat sink clip, which can eliminate the limitations described.