Abstract: A device is disclosed for locking to a gooseneck-type trailer tongue of the type having a lockable tongue mechanism and a lower surface. A ball member has a semi-spherical upper portion and a lower surface. The lower surface is traversed by a threaded aperture. A peripheral side of the upper portion has at least one set screw aperture traversing through to the threaded aperture. A tang is threaded at a top end thereof for threaded rotational engagement with the threaded aperture of the ball member and includes a lower end that has at least one bolt aperture therethrough. A collar member includes a tang slot traversing the top and bottom surfaces thereof. A puck lock has a selectively positionable bolt adapted to traverse the bolt aperture of the tang to lock the collar member onto the tang and ball member.

Abstract: An embodiment of the present invention is a king pin lock device that prevents theft of trailers and other objects equipped with a king pin trailer hitch. The lock device has a lock body with a first end and a second end. The second end has a moveable lock bar to engage and disengage the king pin sitting in the first end, and an internal aperture to receive a conventional round puck lock or other suitable lock or locking mechanism. The puck lock is locked onto an immobile retaining bar on the lock body and secures the lock body onto the king pin, preventing any attempt to access the king pin trailer hitch. The puck lock is protected by a perimeter wall surrounding it in the second end of the lock body. The perimeter wall has a key insert window for user access to the keyhole of the puck lock.

Abstract: A lunette trailer hitch lock prevents theft of trailers and other objects equipped with a lunette-style trailer coupler hitch having a lunette eye. The lock device has a top member and a bottom member which are engageable with each other. A conventional step in lock can be used to lock the top member and the bottom member together while sandwiching and plugging the lunette eye, thereby preventing any attempt to access the lunette trailer hitch.