| 摘要 |
<p>Inside a magnetic latchkey (1) for an access-control lock is a series of magnets (5) fastened to sliding pieces (6) capable of being displaced by means of levers or extensions (7) so that each magnet has three possible positions: north pole, south pole, or a point intermediate to both, thereby putting the magnet in front of the appropriate sensor (3) of the lock, in such a way that when there is a particular combination of poles in the latchkey (1) and the same combination of switches on the control panel (13) in touch with the lock, the position of the projections of the latchkey and the position of the switches at the control panel (13) will be identical. An alternative is for each magnet of the latchkey to have two sensors inside the lock.</p> |
