| 摘要 |
PURPOSE: A wind ball type screen door is provided to securely maintain the flat state of the screen door even if external elements are applied to the screen door. CONSTITUTION: A wind ball type screen door comprises a sheet(70), a winding drum, pulleys(20), guide tracks(30), and drive units(80). The sheet is powered by a drive motor(1). The winding drum winds or unwinds the sheet. The pulleys are arranged on both ends of the winding drum. The guide tracks stably guide the wound and unwound sheet. The drive units are accepted in the guide tracks and are connected to first and second control members(83,85) to be vertically moved. |
