| 摘要 |
<p>PURPOSE:To provide possibility of opening a door with no use of key in the case the door is locked while the key sits in the lock hole by counting the frequencies of turning door knobs, and actuating unlocking when the combination of the frequencies is identical to a specified number. CONSTITUTION:Counters 3, 4 are furnished to count the frequencies of turning door knobs 1, 2. A memory 5 stores a certain set number, with which the input data from the counters 3, 4 is compared to serve for judgement, and if the two are identical, a relay 6 is switched on. Then a solenoid 8 is set so as to be capable of current feeding, and therefrom an action is applied to the movable part of a door key cylinder 9 so as to unlock the door. This allows using any existing door knob to lead to suppression of the manufacturing cost otherwise required to acquire additional components, and the locked door can be opened externally in a short time with no use of the key.</p> |
