Abstract: A locking device for selectively lockingly engaging a towing element of a trailer to block coupling access to the towing element. The locking device includes a housing defining a towing element receptacle, an engaging element having an engaging portion and an actuating portion for selectively engaging a towing element disposed within the towing element receptacle, a locking compartment adapted to house the actuating portion of the engaging element, a locking compartment cover, an actuating tool coupled to the locking compartment cover and adapted to cooperate with the actuating portion of the engaging element, a locking chamber for receiving the actuating tool when the locking compartment cover is in a closed position, and a lock for selectively locking the actuating tool within the locking chamber and locking the cover in place.

Abstract: An improved device for immobilizing or impounding a land or air vehicle having at least one wheel assembly against movement on the ground, wherein the device includes a pair of pivotal jaws for embracing the wheel assembly, with a pair of inwardly directed teeth carried by the jaws for engaging opposed portions of the wheel rim. An adjustable bolt is provided for limiting the degree of pivotal movement of the jaws to permit the device to accommodate the size of a given wheel assembly and secure the device in a position of use. A locking mechanism prevents theft or unauthorized removal of the vehicle by denying access to the adjustable bolt.