Patent ID: 7533551

Claim:
A door lock comprising: a case adapted to be mounted in a door and including two opposite lateral sides each having a key cylinder-receiving hole; a deadbolt mounted in the case and movable between an extended, locking position outside the case and a retracted, unlocking position inside the case; a key cylinder mounted in the case and including a hollow body receiving a lock core operable to retract the deadbolt from the extended position to the retracted position, with the hollow body including at least one longitudinal groove formed in an outer circumference thereof; and a positioning device mounted in the case and including a retainer slideable between the two lateral sides of the case and an operative member operable to move the retainer between a retaining position engaged with said at least one longitudinal groove of the key cylinder and a releasing position disengaged from the key cylinder, with the two lateral sides of the case further including two aligned first sliding slots each of which is in communication with an associated key cylinder-receiving hole, two aligned second sliding slots and two aligned anchor holes, with the retainer including a first end, a second end, and two lateral sides, with a stop being provided on each of the two lateral sides of the first end of the retainer and slideably received in one of the two first sliding slots in the case, with a protrusion being provided on each of the two lateral sides of the retainer adjacent the second end of the retainer and slideably received in one of the two second sliding slots in the case.