Patent ID: 8151605

Claim:
A device for locking to the tongue of a trailer of the type having a lockable tongue mechanism and a lower surface, comprising: a ball member having a semi-spherical upper portion and a bottom surface, the bottom surface traversed by a threaded aperture, a peripheral side of the upper portion having at least one set screw aperture traversing through to the threaded aperture; a tang threaded at a top end thereof for threaded rotational engagement with the threaded aperture of the ball member, at least one set screw adapted to tighten within the at least one set screw aperture to prevent rotation of the tang with respect to the ball member, at least a portion of the tang not extending to the peripheral side of the ball member so as to expose at least a portion of the bottom surface of the ball member, the tang further including at a lower end thereof at least one bolt aperture therethrough; a collar member having a top surface, a bottom surface, and a peripheral edge, a tang slot traversing the top and bottom surfaces; a puck lock having a selectively positionable bolt adapted to traverse the bolt aperture of the tang to lock the collar member onto the tang and ball member; whereby with the ball member inserted into the trailer tongue and the lockable tongue mechanism locked thereto, the top surface of the collar member can be locked against a lower surface of the trailer tongue to prevent removal of the ball member from the trailer tongue to inhibit unauthorized towing of the trailer.