| 摘要 |
A magnetic key lock provided with an alarm system, the key lock including a normally closed first switch and a normally open second switch, both switches being connected to the alarm system so that the alarm system is activated when the first and second switches are both closed. The second switch is associated with a tumbler of the lock so that the second switch is closed upon movement of the tumbler when a key or lock pick is inserted into the key slot of the lock. A magnetic sensor is provided adjacent to key slot so that a proper magnet-bearing key can activate the magnetic sensor before the second switch is closed by the tumbler movement in order to delay activation of the second switch for a selected time period to allow the proper key to open the first switch while opening the lock for inactivating the alarm system. A futher switch is provided to test the working ability of the alarm system. The alarm system can include a wirelessly controlled remote alarm. When thekey lock is mounted in a door, another switch can be provided to activate the alarm system when the door is forced open without using the proper key, where the alarm system can be controlled by a latch knob mounted inside the door.
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