Abstract: An electronic lock includes two covers respectively formed on an outside and inside of a door, a tumbler slidably moving in a tumbler hole formed in a central transmission shaft secured to an outside door knob and moving in a tumbler socket formed in a sleeve engageable with the central shaft and secured to an inside knob, in which the tumbler is operated, by the action of a magnet manually swung or by an electromagnetic coil which is powered by a sensor when sensing a correct coded number card inserted in the sensor, to couple the central transmission shaft with the sleeve coupled to a dead latch so that upon a rotation of the outside knob to rotate the central shaft, the sleeve will be rotated to retract the dead latch for opening the door.

Abstract: An electronic lock comprises an outside cover having a sensor formed in the cover, an inside cover, a base having batteries stored in the base, a control device and two bolts of which a latch bolt can be retracted or extended for opening or closing a door when the door is not locked and a dead bolt can be operated by a thumbturn formed in the inside cover, and upon an insertion of a correct coded number card to sense the sensor to actuate an electromagnetic coil of the control device, the dead bolt can be operated for unlocking or locking the door from outside a door.