| 摘要 |
PURPOSE:To make a fitting tool of complex shape unnecessary when a tube is joitned to a fin hole, by providing a bearing hole at a specified distance from the hole of a fin. CONSTITUTION:A fin 5 is made in the shape of a square. A tube piercing hole (hole part) 7 for a tube 6 is punched in the center of a fin, while a bearing hole 8 of small diameter is punched at a specified distance from the hole part 7. A fixing rod as a fitting tool is to be pierced through the bearing hole 8. It enables the fin 5 to joint the tube in a desired direction, that is an arbitrary angle, by setting the position of a bearing hole 8 by each fin 5. |
