Abstract: The lock is of the type comprising: a housing that can be fastened to the door frame of the landing entrance, a locking bolt for the landing entrance, a bolt-control lever, an exterior lever-operating arm actuated by a cam in the elevator car, an electrical contact indicating the presence of the elevator car, a door pull-away electrical contact, a cable bushing device, and a housing attachment. These components are adaptable to many types of elevators, either by being reversible and/or by adaptation of spare parts supplied and arranged in a stand-by configuration in a recess in the housing.