| 摘要 |
PROBLEM TO BE SOLVED: To provide a key switch of a trapped key type, the key enabling an operator confined in a dangerous area to unlock from inside.SOLUTION: A key switch 1A comprises: a first slide member 47A that is moved by the drive of an electromagnetic solenoid 25; a second slide member 48A that is made immovable by movement of the fist slide member in one direction and made movable by movement in other direction; a locking member 49 moved in a locking position and an unlocking position by linking with movement of the second slide member; and lock and unlock operation means 4 and 50 provided so as to be operable from outside a door and configured to move the second slide member to the locking position and the unlocking position. The key switch 1A is provided with a rear unlock member 51A that is provided so as to be operable from inside the door, that moves the first slide member to the unlocking position by the first stage of an operation, and moves the second slide member to the unlocking position by the second stage of the operation. |
