| 摘要 |
PURPOSE: A roller for windows and doors is provided to improve airtightness by closely attaching a window to the window frame, and to smoothly move by the ball of a ball bracket. CONSTITUTION: A roller(100) for windows and doors comprises an outside bracket(200), a ball bracket(300), a housing(110), a wheel(130), and an elastic unit(500). The outside bracket is fixed to the lower side of a window. The ball bracket is movably installed in the lower side of the outside bracket and is penetrated by multiple balls. The housing is movably installed in the lower side of the ball bracket and is internally or externally moved by the ball. Both sides of the outside bracket are formed with guide units(211) facing each other. A space between the guide units is combined with the ball bracket and the housing. |
