| 摘要 |
PROBLEM TO BE SOLVED: To improve operability, and to simplify a structure. SOLUTION: This door lock is provided with doorknobs 5, 8 provided on the outside and inside of a door, respectively and for opening and closing the door, and a lock mechanism for obstructing the door-opening operation of the outside doorknob 8 by interlocking with the operation of the inside doorknob 5. The door-opening operation of the outside and inside doorknobs 5, 8 are set to a rotation in a fixed direction, and only the inside doorknob 5 can be turned in a reverse direction to the door opening operation. The lock mechanism is lockingly operated by the rotation in the reverse direction to the door opening operation of the inside doorknob 5.
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