| 摘要 |
PROBLEM TO BE SOLVED: To provide a door with a small door by which one can get a package or a registered mail without opening the door itself and hence without allowing a foreigner to enter inside of the door. SOLUTION: A small door 2 is formed at an optional position of the door 1 so as to be freely openable and to abruptly drop a shutter in an emergency. In the structure, a knob 5 is raised without opening the door, then, the lower part of a shutter 4 which has been locked in a groove 8 provided at the upper part of the small door 2 is dislocated, then, a handle 16 is turned to the right, according to an indication of opening mark and one end 13 of an L-shaped tool 12 moves a lock 10 to the right and a lock 9 interlocked with a gear 11 is moved to the left and hence, the locks 9, 10 are released. The small door is pulled in this side. Then, one can receive a package or a registered mail or impress a seal. Thereafter, when closing the small door 2, the upper part of the small door 2 pushes up the lower part of the shutter 4 and then the small door is completely closed. When moving the emergency lever 7 to the right, a claw 6 moves to the right and the connection part of the shutter 4 and the knob 5 is released from the claw 6 and the shutter 4 falls abruptly due to the own weight.
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