| 摘要 |
PROBLEM TO BE SOLVED: To improve a form of a change key for precisely changing a required key code without mistaking the change key, in a door lock device of a control board storage box of a traffic light. SOLUTION: This lock device is installed in the control board storage box of the traffic light and locks a door existing in a closing position to a box body. The lock device is incorporated with a variable code type cylinder lock unit changeable to mutually different three kinds of change keys by three kinds of first, second and third change keys. A knob part of the first change key is colored in blue; a knob part of the second change key is colored in yellow; and a knob part of the third change key is colored in red. COPYRIGHT: (C)2005,JPO&NCIPI
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