| 摘要 |
<p>Glass-fibre reinforced plastic door having a frame 110, 120; first and second Glassfiber Reinforced Plastic (GRP) skins 210, 220 attached to front and rear sides of the frame; an interior material (320, Fig. 2) filling the space defined by the frame and skins; a doorknob 221 at a side of the second skin; and a reinforcing member 400 on the rear side of the first skin. The reinforcing member prevents an intruder from reaching the doorknob sequentially through the first skin, interior material, and second skin within predetermined time. The reinforcing member may be located in an area from the centre to the bottom of the frame. The reinforcing member may have lattices with a largest side length of 5cm or less and may be 4 to 6 mm thick. The reinforcing member may be a plate having a plurality of holes and may be made of cellulose fibre reinforced cement board (CRC).</p> |
