Heat sink with radially arranged radiation fins

Abstract

A heat sink includes a tubular base having longitudinal channels arranged in parallel around the periphery and a first and a second ribs protruding from the periphery and respectively extending along two opposite sides of each of the channels, and radiation fins radially arranged around the tubular base and supported on the second ribs, each radiation fin having an angled foot portion respectively inserted into the channels and secured thereto by the first ribs that are stamped down after the angled foot portions of the radiation fins are inserted into the channels of the tubular base.

1 . A heat sink, comprising:
 a tubular base, said tubular base having a plurality of longitudinal channels arranged in parallel around the periphery thereof, and a plurality of first ribs protruding from the periphery and respectively extending along a first side of each of said channels;   a plurality of radiation fins radially arranged around said tubular base, each said radiation fin having an angled foot portion, which is inserted into one said channel and secured thereto by the associated first rib upon deformation of the associated first rib by an external force.   
     
     
         2 . The heat sink as claimed in  claim 1 , wherein said radiation fins are respectively made of a thin metal sheet, each having an inner end edge folded up and curved to form the respective angled foot portion. 
     
     
         3 . The heat sink as claimed in  claim 2 , wherein each said radiation fin has an outer end edge folded up to form a respective outer obtuse edge opposite to the angled foot portion of the respective radiation fin. 
     
     
         4 . The heat sink as claimed in  claim 1 , wherein said tubular base further comprises a plurality of second ribs protruding from the periphery and respectively extending along a second side of each of said channels opposite to one said first rib. 
     
     
         5 . The heat sink as claimed in  claim 1 , further comprising at least one retaining plate attached to said radiation fins at one of top and bottom sides thereof to secure said radiation fins together. 
     
     
         6 . The heat sink as claimed in  claim 1 , wherein said tubular base has a round or oval cross section. 
     
     
         7 . The heat sink as claimed in  claim 1 , wherein said tubular base has a rectangular, trapezoidal or rhombic cross section. 
     
     
         8 . The heat sink as claimed in  claim 1 , wherein said tubular base is a hollow tube with a closed bottom side. 
     
     
         9 . The heat sink as claimed in  claim 8 , wherein said tubular base has a plurality of mounting holes on the closed bottom side thereof. 
     
     
         10 . The heat sink as claimed in  claim 1 , wherein said tubular base is a solid tube. 
     
     
         11 . The heat sink as claimed in  claim 1 , wherein said tubular base is a hollow tube. 
     
     
         12 . The heat sink as claimed in  claim 1 , wherein the angle of the angled foot portions of said radiation fins is 90-degrees. 
     
     
         13 . The heat sink as claimed in  claim 1 , wherein the angle of the angled foot portions of said radiation fins is an acute angle. 
     
     
         14 . The heat sink as claimed in  claim 1 , wherein the angle of the angled foot portions of said radiation fins is an obtuse angle.