| 摘要 |
PROBLEM TO BE SOLVED: To enable production of light-weight and less expensive new door frame and to prevent as much as possible the opening of the new door frame being smaller than the opening of the existing door. SOLUTION: An existing door is moved from the existing door frame 1 and a new door frame 4 and a new door 3 are installed. In order to install the new door frame 4 to the existing door frame 1, one vertical frame 4Ba of the new other opening 4B is overlapped on the vertical frame of the existing outer opening 1Ba, and a hinge 23 located on the vertical frame 4Ba of the new outer opening 4B is connected and fixed on to at least the vertical frame 4Ba of the existing door frame. In addition, the new door 3 is pivotally connected the hinge 23.
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