| 摘要 |
PURPOSE: A secondary door locking device is provided to conveniently and safely open a part of a door when a user needs to check a visitor. CONSTITUTION: A secondary door locking device comprises a hanging bracket(110), a hinge bracket(210), a rotating body(300) and a locking rod. The hanging bracket is installed on a door frame. The hinge bracket is installed in a door. The rotating body is hinged with the hinge bracket and rotates. The locking rod is combined in the rotating body and is selectively hangs on the hanging bracket. The locking rod opens and closes a part of a door. |
