Door lock device

In a door lock device which comprises an indoor handle and an outdoor handle which are installed inside and outside a room, respectively, a door lock button positioned on the indoor handle for switching a locking state of a door;

• an unlocking button positioned on the outdoor handle for releasing the locking state of the door lock button, and a door lock unit located on the door for being snapped in a snap piece which is disposed on a door frame,
• said door lock device comprising:
• an indoor housing and an outdoor housing each having inner tube-shaped supports;
• an indoor handle connection member and an outdoor handle connection member each having handle connections provided on a first end thereof in communication with the indoor and outdoor handles through the indoor and outdoor housings, respectively, and driving cams provided on a second end thereof formed with a cam curvature having step differences in an axial direction;
• an indoor slide cylinder and an outdoor slide cylinder each having driven cams provided on a first end thereof in contact with the driving cams, and experiencing a rectilinear motion in the axial direction by means of an axial step difference formed according to movement of the indoor and outdoor handle connection members;
• a first closely coupling spring having a first end fixed to the indoor handle connection member, and a second end fixed to the indoor slide cylinder;
• a second closely coupling spring having a first end fixed to the outdoor handle connection member, and a second end fixed to the outdoor slide cylinder;
• an indoor end frame and an outdoor end frame for allowing the indoor and outdoor slide cylinders, respectively, to be guided rectilinearly in the axial direction by means of a rectilinear guide fitting, and simultaneously being in communication with the indoor and outdoor housings, respectively;
• a guide frame located between the indoor and outdoor end frames and having an operating piece supported by a door lock spring, wherein the operating piece is connected to the door lock unit;
• and
• an indoor rotary piece and an outdoor rotary piece positioned to experience a rotational motion with the indoor and outdoor end frames by means of first and second pins, respectively, and having a sliding rotational motion by means of the indoor and outdoor slide cylinders for transferring the motion thereof to the operating piece.