Abstract: Disclosed herein is an apparatus for opening and closing a front entrance. The apparatus includes: a door lock housing which has an opening in which a latch bolt is disposed; first and second door handles which are provided on the door and configured to be pushed or pulled; a movable member which is disposed in the door lock housing and horizontally moved by pushing or pulling either the first door handle or the second door handle, with a lift guide block provided on the movable member; a rotating unit which includes a roller and a bent part; a latch bolt coupling unit which is locked to the bent part of the rotating unit and coupled to the latch bolt; and a restoring spring which is configured such that the rotating unit is returned to its original state.

Abstract: Disclosed herein is a digital opening and closing device for an entrance. The device includes: a housing which includes an outer casing and an inner casing with a door interposed between the inner and outer casings; a password input unit which is provided on the outer casing; a door opening and closing unit which is installed in the housing and conducts the operation of opening or closing the door; a control unit which compares a password input to the password input unit with a preset reference password and controls the door opening and closing unit; an opening button which is provided on the inner casing and is used in automatically opening the door; a manual opening button which prevents the door from being automatically locked when the door is closed; and a power supply supplying drive power to the elements.

Abstract: Disclosed herein is a digital opening and closing device for an entrance. The device includes: a housing which includes an outer casing and an inner casing with a door interposed between the inner and outer casings; a password input unit which is provided on the outer casing; a door opening and closing unit which is installed in the housing and conducts the operation of opening or closing the door; a control unit which compares a password input to the password input unit with a preset reference password and controls the door opening and closing unit; an opening button which is provided on the inner casing and is used in automatically opening the door; a manual opening button which prevents the door from being automatically locked when the door is closed; and a power supply supplying drive power to the elements.

Abstract: Disclosed herein is an apparatus for opening and closing a front entrance. The apparatus includes: a door lock housing which has an opening in which a latch bolt is disposed; first and second door handles which are provided on the door and configured to be pushed or pulled; a movable member which is disposed in the door lock housing and horizontally moved by pushing or pulling either the first door handle or the second door handle, with a lift guide block provided on the movable member; a rotating unit which includes a roller and a bent part; a latch bolt coupling unit which is locked to the bent part of the rotating unit and coupled to the latch bolt; and a restoring spring which is configured such that the rotating unit is returned to its original state.