Heat sink assembly

Abstract

A heat sink assembly includes a base and a mounting apparatus. The base defines a stepped hole. A step is formed in the stepped hole. A cutout is defined on an edge of the base and communicates with the stepped hole. The mounting apparatus includes a bolt and a spring. The bolt defines a groove at a portion of the bolt to form an engaging portion thereof. The engaging portion passes through the cutout. The step engages in the groove of the bolt. The spring is retained around the bolt, received in the stepped hole, and abuts against the step to retain the bolt in the stepped hole.

1 . A heat sink assembly, comprising:
 a base defining a stepped hole therein, wherein a step is formed in the stepped hole and a cutout is defined on an edge of the base and communicating with the stepped hole; and   a mounting apparatus comprising a bolt and a spring, wherein the bolt defines a groove at a portion of the bolt to form an engaging portion thereof, the engaging portion passes through the cutout into the stepped hole; the step engages in the groove of the bolt; the spring is retained around the bolt, received in the stepped hole, and abutting against the step to retain the bolt in the stepped hole.   
   
   
       2 . The heat sink assembly of  claim 1 , wherein the stepped hole comprises a large hole and a small hole communicating with the large hole; the step is formed around the small hole. 
   
   
       3 . The heat sink assembly of  claim 2 , wherein the engaging portion has a wide side and a narrow side. 
   
   
       4 . The heat sink assembly of  claim 3 , wherein a width of the wide side is larger than a width of the cutout, and smaller than a diameter of the small hole; a width of the narrow side is smaller than a width of the cutout to move the engaging portion in the stepped hole. 
   
   
       5 . The heat sink assembly of  claim 1 , wherein a height of the groove is larger than a height of the step. 
   
   
       6 . The heat sink assembly of  claim 1 , wherein the bolt comprises a head at an end thereof, the spring is compressed between the head and the step. 
   
   
       7 . The heat sink assembly of  claim 6 , wherein the bolt has a threaded portion, the groove is defined between the head and the threaded portion. 
   
   
       8 . A heat sink assembly, comprising:
 a base defining a stepped hole therein, wherein a step is formed in the stepped hole and a cutout is defined on an edge of the base and communicating with the stepped hole; and   a bolt defining a groove to form an engaging portion thereof, the engaging portion having a wide side and a narrow side, a width of the narrow side is narrower than a width of the cutout to move the engaging portion in the stepped hole, a width of the wide side is wider than a width of the cutout to retain the bolt in the stepped hole when the narrow side is not aligned with the cutout.   
   
   
       9 . The heat sink assembly of  claim 8 , further comprising a spring retained around the bolt, inserted in the stepped hole, and abutting against the step to retain the bolt in the stepped hole. 
   
   
       10 . The heat sink assembly of  claim 8 , wherein the step engages in the groove. 
   
   
       11 . The heat sink assembly of  claim 10 , wherein a height of the groove is larger than a height of the step. 
   
   
       12 . The heat sink assembly of  claim 8 , wherein the stepped hole comprises a large hole and a small hole communicating with the large hole; the step is formed around the small hole. 
   
   
       13 . The heat sink assembly of  claim 8 , wherein the bolt comprises a head at an end thereof, the spring is compressed between the head and the step. 
   
   
       14 . The heat sink assembly of  claim 13 , wherein the bolt has a threaded portion, the groove is defined between the head and the threaded portion.