| 摘要 |
The present invention provides an automatic door locking device, which automatically locks a door if the door is closed and makes it difficult to forcefully open the door by the strong hand. The disclosed automatic door locking device comprises: a motor mounted within a housing; a protrusion member including a protrusion protruding out of the housing to lock a closed door or going back into the housing to unlock the closed door according to a rotational direction of a shaft of the motor; a trigger member elastically biased to make an end of one side protrude out of the housing and, if the door is closed, pressed to make the end of one side go back into the housing; and a switch for giving an impulse to the motor such that the shaft of the motor rotates in a direction of making the protrusion protrude out of the housing when the end of one side of the trigger member goes back into the housing. |
