Heat sink assembly

Abstract

A heat sink assembly includes a heat sink, a bracket, and an airflow guide member. The heat sink defines an air outlet at a rear end of the heat sink. The bracket includes two side plates respectively fastened to rear ends of opposite sides of the heat sink. A number of vertically arrayed protrusions are formed on a rear end of an inner surface of one of the side plates. The airflow guide member is pivotably connected between the side plates. An end of the airflow guide member engages with a different one of the protrusions, to position the airflow guide member at a different angle relative to the heat sink.

What is claimed is: 
     
         1 . A heat sink assembly, comprising:
 a heat sink defining an air outlet at a rear end of the heat sink;   a bracket comprising two side plates respectively mounted to rear ends of opposite sides of the heat sink, wherein a plurality of vertically arrayed protrusions is formed on a rear end of an inner surface of one of the side plates; and   an airflow guide member pivotably connected between the side plates, an end of the airflow guide member engaging with a different one of the protrusions to position the airflow guide member at a different angle relative to the heat sink.   
     
     
         2 . The heat sink assembly of  claim 1 , wherein a pivot hole is defined in each side plate above the protrusions, the airflow guide member comprises two pivots at upper portions of opposite ends of the airflow guide member, to pivotably engage in the pivot holes, respectively. 
     
     
         3 . The heat sink assembly of  claim 2 , wherein the protrusions are arranged behind the pivot holes. 
     
     
         4 . The heat sink assembly of  claim 1 , wherein at least two vertically arrayed pivot holes are defined in each side plate, the airflow guide member comprises two pivots at the upper portions of opposite ends of the airflow guide member, to selectively and pivotably engage in two pivot holes of the side plates at a same lever, respectively. 
     
     
         5 . The heat sink assembly of  claim 4 , wherein the protrusions are arranged behind the pivot holes. 
     
     
         6 . The heat sink assembly of  claim 1 , wherein the heat sink comprises a base and a plurality of fins formed on the base in a substantially perpendicular manner, the fins are parallel to each other, and extend in a fore-and-aft direction, the air outlet is defined in rear ends of the fins, and an air inlet is defined in front ends of the fins. 
     
     
         7 . The heat sink assembly of  claim 6 , wherein the fins at left and right sides of the heat sink each define two through holes, adjacent to the rear end of the heat sink, two poles are formed on an front end of the inner surface of each side plate, the poles of the side plates respectively engage in the through holes of the fins at left and right sides of the heat sink. 
     
     
         8 . The heat sink assembly of  claim 6 , wherein the bracket further comprises a top plate connected between tops of the side plates, the top plate is arranged above tops of the rear ends of the fins. 
     
     
         9 . The heat sink assembly of  claim 8 , wherein the bracket further comprises a connecting plate connected between rear ends of bottoms of the side plates, the connecting plate is arranged behind the base.