Door lock with easy-to-install and remove input interface module

A door lock comprising:

• a latch device including a latch movable between a latching position and an unlatching position;
• an inner operating device mounted to a side of the latch device and is configured to move the latch between the latching position and the unlatching position, wherein the inner operating device includes an inner escutcheon having a maintenance hole;
• an outer operating device mounted to another side of the latch device and is configured to move the latch between the latching position and the unlatching position, wherein the outer operating device includes an outer escutcheon having a mounting area, and wherein the mounting area includes a socket aligned with the maintenance hole;
• a main board fixed in the inner escutcheon, wherein the main board is configured to control the outer operating device to or not to move the latch between the latching position and the unlatching position;
• a fastener rotatably coupled with the socket;
• an input interface module removably mounted in the mounting area and electrically connectable with the main board, wherein the input interface module is configured to permit input of an unlocking identification information or an unlocking command by a physical or wireless measure, wherein the input interface module includes a connecting member, wherein when the maintenance hole is revealed, the fastener is rotatable to tighten or loosen the connecting member of the input interface module, wherein when the connecting member is tightened by the fastener, the input interface module is secured in the mounting area, and wherein when the fastener is disengaged from the connecting member, the input interface module is removable from the outer escutcheon;
• and
• a clutch in electrical connection with the main board and including:
• an outer box;
• an intermediate member pivotably connected to the outer box, wherein the intermediate member is configured to couple with an outer handle of the outer operating device to pivot therewith;
• a torsion spring disposed between the intermediate member and the outer box, wherein the torsion spring biases the intermediate member to an initial position;
• and
• a coupling member pivotably mounted between the intermediate member and the outer box, wherein the coupling member is configured to be operatively connected to the latch of the latch device, wherein the main board controls the coupling member to or not to pivot jointly with the intermediate member, wherein when the coupling member and the intermediate member are jointly pivotable, pivotal movement of the outer handle causes the latch to move from the latching position or the unlatching position, and wherein when the coupling member is not jointly pivotable with the intermediate member, pivotal movement of the outer handle is incapable of causing movement of the latch,
• wherein the clutch further includes a clutch member movably coupled to the intermediate member and jointly pivotable with the intermediate member, wherein the clutch member includes an engaging arm, wherein the clutch member is movable along a pivotal axis of the intermediate member between an engagement position and a disengagement position, wherein when the clutch member is in the engagement position, the coupling member and the intermediate member are jointly pivotable, and wherein when the clutch member is in the disengagement position, the coupling member is incapable of pivoting jointly with the intermediate member,
• wherein the clutch further includes a driving device in electrical connection with the main board, wherein the driving device includes:
• a motor configured to be driven by the main board;
• a shaft configured to be driven by the motor to rotate, wherein the shaft includes an outer periphery having a threaded section;
• a helical elastic element in threading connection with the threaded section of the shaft, wherein the helical elastic element is compressible and includes a first tang and a second tang, wherein the helical elastic element moves along a longitudinal axis of the shaft when the shaft rotates;
• and
• a sliding block including a compartment having first and second walls opposite to each other, wherein the sliding block further includes an activation end located outside of the compartment, wherein the second wall is located between the first wall and the activation end along the longitudinal axis of the shaft, wherein the sliding block further includes an extension arm extending from the activation arm, wherein the shaft is received in the compartment, wherein the first tang of the helical elastic element is adjacent to the first wall, wherein the second tang of the helical elastic element is adjacent to the second wall, wherein the first tang and the second tang are configured to be restricted and retained in place by the first and second walls when the shaft rotates, wherein when the helical elastic element moves and the first tang abuts against the first wall, the sliding block moves away from the intermediate member along the longitudinal axis of the shaft, and the clutch member moves to the disengagement position, wherein when the helical elastic element moves and the second tang abuts against the second wall, the sliding block moves towards the intermediate member along the longitudinal axis of the shaft, and the clutch member moves to the engagement position, wherein when the clutch member is not aligned with the engaging groove and the helical elastic element moves towards the intermediate member, a section of the helical elastic element between the threaded section and the second tang is compressed by the threaded section and the second wall.