| 摘要 |
<p>A combination lock is provided, each of buttons of which has to be pressed respective correct numbers of times (including zero time) for unlocking the lock, therefore there is wider variety of different unlocking combinations with limited numbers of buttons, preventing unauthorized persons from easily guessing the current unlocking combination. The combination lock is made such that a knob connected thereto will be, when operated, only capable of turning in an idle manner without causing a dead bolt to disengage a door equipped with the lock unless all numbered buttons of the lock are correctly pressed according to the current unlocking combination, preventing unauthorized persons from succeeding in unlocking the door by means of turning the knob violently.</p> |
