| 摘要 |
A key and a lock in a lock device having variable bit and ward patterns, respectively. The key has two pieces of bit members, one member of which is slidably fitted in a groove defined in the other member, while the other is stationary. The lock has ward members cooperative to those of the key, one of the ward members being movable, and the other being stationary. Thus, when the key is inserted into the lock and turned to its angularly displaceable end, and the position of the movable bit member of the key is varied, then the cooperative movable ward member in the lock may be moved thereby accordingly. The both movable members are then rigidly fixed in desired position. Thus, the lock can no longer be opened by a duplicate key or a master key. Alternatively, the two bit and ward members in a key and a lock may be so designed as to be movable, respectively.
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