Door lock with automatic locking of deadbolt

A door lock comprising:

• a case adapted to be mounted in a door;
• an inside handle adapted to be mounted to an inner side of the door;
• a latch bolt mounted in the case and movable between an extended, latching position outside the case and a retracted, unlatching position inside the case, with the latch bolt being operably connected to the inside handle such that rotation of the inside handle causes the latch bolt to move from the extended, latching position to the retracted, unlatching position;
• a deadbolt mounted in the case and including an outer end and an inner end, with the outer end of the deadbolt being movable between an extended, locking position outside the case and a retracted, unlocking position in the case;
• a spring device mounted to the inner end of the deadbolt for biasing the outer end of the deadbolt toward the extended, locking position;
• a positioning member mounted in the case, with the positioning member being engaged with and retaining the deadbolt in place when the outer end of the deadbolt is in the retracted, unlocking position;
• and
• an auxiliary bolt mounted in the case and including a head movable between an extended position and a retracted position, with the auxiliary bolt being operably connected to the positioning member,
• with the auxiliary bolt disengaging the positioning member from the deadbolt when the auxiliary bolt is in the retracted position such that the deadbolt is moved to the extended, locking position by the spring device.