Patent ID: 7073257

Claim:
A method of forming a sealing structure at an open end of a heat pipe, comprising: pressing one side of the open end towards the other side of the open end by a press module including a first mold with a convex contact and a second mold with a concave contact until the side walls of the open ends contact each other so that a double-layered recess is formed with a cross-sectional length larger than a semicircumference of an outer circular wall of the heat piper; and placing the pressed open end in a forming module including four molds each having a concave contact so that the recess is formed with a curve which is the same as the curve that the outer circular wall has when the four molds am combined together, thereby, due to the cross-sectional length of the recess being larger than the semicircumference of the outer circular wall, a perimeter of the curve will exceed the semicircumference of the outer circular wall.