| 摘要 |
A mid-bar structure for reducing a gap between mid-bars of an umbrella is provided to maintain smooth joining between pipes of mid-bars and to keep the balance and safety of an umbrella spring by maximally reducing a gap between the pipes of the mid-bars. A mid-bar structure for reducing a gap has multiple joints. The multiple joints are overlapped. An inner pipe(10) is installed in an overlapped part between pipes(20,30). The pipes of each part are symmetrical to each other. The cross sections of the pipes except for the top or bottom pipe are formed in the polygonal structure. A new polygon structure is formed by forming the symmetrical or protruded structure at the inside. |
