| 摘要 |
PURPOSE:To prevent a liquid or air leak by strongly fixing a boss to a joint, by forming a reinforced part to the lower end of the boss for inserting a hanging rod through the center of the joint and fix the same thereto in a radial form. CONSTITUTION:A joint 1 is constituted by arranging U-shaped grooves in a cross shape and thin wall parts 3 is formed in an extended state so as to be continued to the thick wall parts 2 for constituting the central part of said joint 1. In addition, the lower end of a boss 5 for inserting a hanging rod 4 through the center of the joint 1 and fixing the same thereto is fixed to the center of said joint 1 and the joint 1 is suspended from a ceiling through the rod 4 and the boss 5. The boss 5 has four reinforced parts 6 formed to the outside thereof in a radial form. A U-shaped channel 7 is inlaid with each thin wall part 3 of the joint 1 while a U-shaped fine groove 8 is formed between the U-shaped groove 7 and the thick wall part 2 and the fine groove 8 is filled with a seal material to inhibit the fluid leak in the joint 1 and the U-channel 7. |
