| 摘要 |
The safety trap-door gets open or close according to the motion of the entrance door of the passenger train by connecting the trap-door to a lower part of the entrance door. It comprises a main body(1); a 1st door(10) inserted into or separated from the main body(1); a 2nd door(20); a 3rd door(30); pockets(2,3) installed in the main body(1) for accepting the 1st door(10) and the 2nd door(20); the other pocket(21) installed in 2nd door(20) for accepting the 3rd door(30); guide rails(40) formed in the doors(10,20,30) for smoothly moving them; a guide roller(31) installed in the 3rd door(30).
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