| 摘要 |
A key 10 is provided with two tracks 21, 25 of surface depressions on opposite sides of its shank 20, 24. The door lock mechanism 30 includes a pair of micro-switches 34, 36 operated by followers 38, 40 which follow the contours of the two tracks as the key is inserted. Signals produced by the operation of the switches 34, 36 one being 8 regular clock signal and the other being a code signal, are compared and, if they correspond to a stored code, an unlock signal is produced. <IMAGE> |
