Abstract: A lock assembly comprises a stud for mounting on one member such as a door, a plate for pivotal mounting on another member and a separate locking member for locking the plate to the stud having locking mechanism comprising a cylinder slidable in the locking member and onto the stud, a ball movable through the cylinder wall from a locking position where it engages a groove in the stud and an unlocked position, a ring catch for holding the cylinder and thus the ball in their locked positions and a key-operated lock for operating the catch and also a dead lock.

Abstract: A lock assembly for locking one member, such as a door, to another member, such as the frame, comprises a stud unit and a lock unit which can be locked on the stud by means comprising a slide which is engaged between the stud and a surface in the lock unit, a locking ball which extends through an opening in the slide into either a recess in the stud to prevent separation of the units or a recess in the lock unit, which allows such separation, a catch for holding the slide locked and a key-operated lock for releasing the slide.