| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a railed window frame looks bad and has ruggedness and a user may stumble over the ruggedness sometimes, further, dust or the like is easily collected in a rail groove and a door roller of a sash-window and cleaning thereof is troublesome.SOLUTION: Rails for a door roller and a window frame of a sash-window are eliminated, the sash-window is fitted into a slit provided on a top face of the window frame, and the sash-window is supported by a supporting roller provided within the window frame. |
