| 摘要 |
PURPOSE: A sound and fire-proof door is provided to minimize a part that the face of a steel plate is seen by attaching a decoration plate such as timber or MDF on a front and a rear plate including both wing units which is combined with the front and the rear plate and touches on the face of a door frame. CONSTITUTION: An installing groove to install a decoration plate(40) is formed on one face of the front and the rear plates(10, 20), and the decoration plate for decorating the door is attached by attaching materials such as timber, nonmetal, MDF and so on. Herein, a first reinforcing plate(80) formed with plural projections on the inner side is welded, and a second reinforcing plate(70) formed with plural combining holes for butting with the first reinforcing plate welded on the front plate so as to combine
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