| 摘要 |
PROBLEM TO BE SOLVED: To provide the key cover of a manhole cover and the locking device of the manhole cover using the key cover capable of surely and strictly locking the manhole cover in a simple constitution, easily unlocking it by only a permitted person or group, and easily adding an electronic locking mechanism to the locking device of an existing manhole cover without having the electronic locking mechanism. SOLUTION: A cap receiving member 12 is fixed on the upper part of the outer periphery of the key holes 3b, 5b of a manhole inner cover 3 or a manhole cover 5, a key cover A is fitted toward the key holes 3b, 5b and a pin 11b is engaged with the engaging hole 12b of the cap receiving member 12 to lock the key cover A on the key holes 3b, 5b. A control chip 10 incorporated in a fitting part 9a receives an unlocking signal transmitted from the R/W terminal machine of the outside, the pin 11b is dragged in by a control signal transmitted from the control chip 10 to be slipped off from the engaging hole 12b, and access to the key holes 3b, 5b is made possible.
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