Heat sink assembly with mistake-proof structure

Abstract

A heat sink assembly includes a fixing plate, a heat sink, a number of first fasteners, and a second fastener. The fixing plate includes a number of first poles and a second pole extending from a top of the fixing plate. A first threaded hole is defined in a top of each first pole, and a first threaded portion is formed on a top of the second pole. The heat sink includes a base. The first and second fasteners are extended through the base. A second threaded portion is formed on a bottom of each first fastener, and engages in a corresponding one of the first threaded holes. A second threaded hole is defined in a bottom of the second fastener, and engages with the first threaded portion. The second pole and the second fastener can limit the heat sink fixed to the fixing plate to only one angle.

What is claimed is: 
     
         1 . A heat sink assembly, comprising:
 a fixing plate, comprsing a plurality of first poles and a second pole extending from a top surface of the fixing plate, wherein a first threaded hole is defined in a top of each first pole, and a first threaded portion is formed on a top of the second pole;   a heat sink comprising a base;   a plurality of first fasteners extending through the base, wherein a second threaded portion is formed on a bottom of each first fastener, and engages in the first threaded hole of a corresponding one of the first poles; and   a second fastener extending through the base, wherein a second threaded hole is defined in a bottom of the second fastener, and engages with the first threaded portion of the second pole.   
     
     
         2 . The heat sink assembly of  claim 1 , wherein the first poles and the second pole are symmetrically arranged around a center of the fixing plate, the first fasteners and the second fastener are symmetrically arranged around a center of the base. 
     
     
         3 . The heat sink assembly of  claim 2 , wherein each first fastener comprises a head and a post perpendicularly extending down from a bottom of the head, the second threaded portion extends down from a bottom of the post. 
     
     
         4 . The heat sink assembly of  claim 3 , wherein the second fastener comprises a head and a post perpendicularly extending down from a bottom of the head of the second fastener, the second threaded hole is defined in a bottom of the post of the second fastener. 
     
     
         5 . The heat sink assembly of  claim 4 , wherein a plurality of springs are respectively placed around the posts of the first and second fasteners, and respectively sandwiched between the base of the heat sink and the corresponding heads of the first and second fasteners. 
     
     
         6 . The heat sink assembly of  claim 5 , wherein a circular slot is defined in a circumference of each post adjacent to a bottom of the post, a plurality of substantially C-shaped tabs is respectively engaged in the slots of the posts and engaged with a bottom of the base.