| 摘要 |
PURPOSE:To make it possible to connect accurately an external pipe and an internal pipe in a body by proliferatively junctioning both pipes after tightly junctioning them by way of relative layering cutting at least one of the inner surface of the external pipe and the outer surface of the internal pipe. CONSTITUTION:In order to form the junction faces of an external pipe 1 and an internal pipe 2, a cutter 4' with a cutting blade 3' formed into ring shape facing forward is drawn forward with a rod being faced to the rear end of the external pipe 1 concentrically. Then, a cutter blade 3 of which the inside is formed into ring shape and projected facing behind is firmly connected to the rear end of the external pipe 1 in a body and the internal pipe 2 is pushed concentrically into the pipe 1. And, drawn further forward through the rod, the cutter 4' at the end of the internal pipe 2 cuts concentrically the inner surface of the external pipe 1, and the cutter 4 connected to the rear end of the external pipe 1 also cuts the outer surface of the internal pipe 2 making both pipes perform relative movement in axial direction. The metallic newborn surface of the inner peripheral surface of the external pipe 1 by the cutter 4' and that of the outer peripheral surface of the internal pipe 2 are, therefore, proliferatively junctioned.
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