Door lock

A lock, comprising a first transmission assembly, a second transmission assembly, a motor, a spindle, and a dead bolt, wherein the second transmission assembly comprises a first gear arranged rotatably, and the spindle is connected to the first gear and the dead bolt;

• the first transmission assembly comprises a clutch assembly, the clutch assembly comprises a second gear, a third gear, and a connector, the connector connects the second gear to the third gear, and the second gear is in meshed connection with the third gear;
• the motor is connected to the second gear and configured to drive the second gear to rotate, and the second gear is configured to drive the third gear to rotate;
• the third gear has a first position, a second position, and a third position in respect to the first gear;
• when the third gear is in the first position, the third gear is in meshed connection with the first gear, the third gear is configured to drive the first gear to rotate along a first direction, the first gear drives the spindle to rotate, and the spindle drives the dead bolt to move and retract;
• when the third gear is in the second position, the third gear is separated from the first gear;
• and
• when the third gear is in the third position, the third gear is in meshed connection with the first gear, the third gear is configured to drive the first gear to rotate along a second direction, the first gear drives the spindle to rotate, and the spindle drives the dead bolt to move and extend, wherein the second direction is opposite to the first direction;
• the clutch assembly further comprises a first shaft connected to the third gear and the connector, and the third gear is configured to rotate about an axis of the first shaft;
• the first shaft comprises an excess part located on one side of the connector that faces away from the third gear;
• and
• the first transmission assembly further comprises a first limit element connected to the excess part and the connector.