| 摘要 |
The present invention relates to a multi-functional door device. More specifically, a door circumferential frame and a door support frame configuring the door device have improved strength as compared with the existing door circumferential frame and the door support frame and are manufactured by using aluminum which has the reduced weight and is an incombustible material. The present invention relates to a technique, wherein at least one among the door circumferential frame and the door support frame is manufactured to have an inner hollow structure through an extrusion method to reduce the weight thereof, and the inner structure is improved to lower own thermal conductivity of metal to thermally insulate a door and blocking a sound. |
