Key-operated door locking device

A key-operated door locking device including a lock casing mountable adjacent to one side of a door and having a keyhole for the insertion of a key;

• a cylinder within the casing and rotatable by the proper key when inserted into the keyhole and rotated therein;
• a dog carried by the cylinder and rotatable therewith;
• a bolt engageable by the dog and adapted to be projected and withdrawn with respect to the casing into and out of a recess in the door frame at said one side of the door;
• a rotatable member rotatably mounted on an axis substantially parallel to the axis of the keyhole;
• at least two rods each pivotably mounted at one end to a different eccentric point on the rotatable member and extending to the upper and lower edges of the door so as to be projected into further recesses in the door frame upon the rotation of the rotatable member in one direction, and to be withdrawn therefrom upon the rotation of the rotatable member in the opposite direction;
• a coupling between the cylinder dog and the rotatable member effective, upon the rotation of the dog by the proper key to cause the bolt to be projected into or withdrawn from its respective recess, also to cause the rotatable member to rotate and to project or withdraw the rods from their respective recesses;
• and a spring-biassed catch;
• said bolt including a tail having notches formed along one edge cooperable with the cylinder dog for projecting and withdrawing the bolt and for rotating the rotatable member to project and withdraw the rods, and further notches along another edge cooperable with said spring-biassed catch for securing the bolt and the rods in their projected or withdrawn positions.