| 摘要 |
A fireproof structure of a door having a tubular door lock can keep the flame from propagating to the rear side in 1 hour fire-resistance test since the latch and spindle are made of the metal selected among brass, stainless steel(SUS), and steel. In a fireproof structure of a door having a tubular door lock, a latch and a spindle of the door are made of the metal selected among brass, stainless steel(SUS), and steel, and a hole(H2) whose diameter is 1~25mm and through which spindle and handle connecting parts(32,33) pass is formed in the thickness direction on the door.
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