| 摘要 |
PURPOSE: A combination-type pipe having a constant inside diameter is provided to prevent the scratch or damage without a protruded portion when materials are accepted a pipe. CONSTITUTION: A combination-type pipe having a constant inside diameter comprises an existing diameter portion(110) and an expanded diameter portion(120). The existing diameter portion has a first combining portion(113) and forms a uniform inside diameter. The expanded diameter portion has a second combining portion(123). The diameter of the expanded diameter portion is extended than the existing diameter portion. When the first combining portion and the second combining portion are combined, the expanded diameter portion is located in the upper of the existing diameter portion.
|
