Door lock apparatus

1. A door lock apparatus which is mounted in a door and moves a deadbolt to a locked position or a released position as a motor is driven, the door lock apparatus comprising:

a main gear rotated by the motor;

a damping clutch part engaged and rotated by rotation of the main gear;

a shaft which is engaged and rotated by rotation of the damping clutch part and moves the deadbolt as the shaft is rotated; and

a knob which is manually operable by a user and is connected to the shaft,

wherein an emergency rotation operation of the shaft is enabled by disengaging the main gear and the damping clutch part through the knob,

wherein when the user presses the knob along an axial direction of the shaft, the shaft is moved along the axial direction and the damping clutch part is disengaged from the main gear,

wherein the shaft includes a stepped portion that engages the damping clutch part along the axial direction of the shaft and the damping clutch part is capable of being lifted to an opposite side of the main gear by the stepped portion.

2. The door lock apparatus of claim 1 , wherein the main gear includes a plurality of restricting grooves spaced apart at a predetermined angle from each other along a circumferential direction, the damping clutch unit includes a plurality of restricting projections each of which is insertable into each corresponding constraining groove, and the damping clutch part is disengaged from the main gear as the plurality of restricting projections are dislodged from the plurality of restricting grooves.

3. The door lock apparatus of claim 1 , further comprising an elastic member which elastically supports the damping clutch part toward the main gear.

4. The door lock apparatus of claim 1 , wherein the shaft includes a clutch engaging portion protruding in a radial direction and the damping clutch part includes a flow groove which is formed in a shape of a circular arc of a predetermined angle and in which the clutch engaging portion is positioned.

5. The door lock apparatus of claim 4 , wherein when the user rotates the knob, the clutch engaging portion is rotated about a central axis of the shaft within the flow groove.

6. The door lock apparatus of claim 1 , wherein the shaft and the knob are elastically supported at an interval of 90 degrees in a rotation process.

7. A door lock apparatus which is mounted in a door and moves a deadbolt to a locked position or a released position as a motor is driven, the door lock apparatus comprising:

a main gear rotated by the motor;

a damping clutch part engaged and rotated by rotation of the main gear; and

a shaft which is engaged and rotated by rotation of the damping clutch part and moves the deadbolt as the shaft is rotated,

wherein when the motor is continuously operated in a state in which rotation of the shaft is restricted, the main gear is disengaged from the damping clutch part and is independently rotated,

wherein the main gear includes a plurality of restricting grooves spaced apart at a predetermined angle from each other along a circumferential direction, the damping clutch unit includes a plurality of restricting projections each of which is insertable into each corresponding constraining groove, and the main gear is disengaged from the damping clutch part as the plurality of restricting projections are dislodged from the plurality of restricting grooves.

8. The door lock apparatus of claim 7 , further comprising an elastic member which elastically supports the damping clutch part toward the main gear.

9. The door lock apparatus of claim 7 , wherein the shaft includes a clutch engaging portion protruding in a radial direction and the damping clutch part includes a flow groove which is formed in a shape of a circular arc of a predetermined angle and in which the clutch engaging portion is positioned.

10. The door lock apparatus of claim 9 , further comprising a knob which is manually operable by a user and is connected to the shaft,

wherein when the user rotates the knob, the clutch engaging portion is rotated about a central axis of the shaft within the flow groove.

11. The door lock apparatus of claim 7 , wherein the shaft is elastically supported at an interval of 90 degrees in a rotation process.