Abstract: An anti-theft device is provided which, when used on a trailer coupler, locks on to the trailer coupler and covers the receptacle of the coupler, thereby preventing the insertion of a hitch ball or other towing means into the receptacle. Locking engagement is achieved by a retaining member being moved and held in a position inside the receptacle of the coupler by the operation of a lock housed in the body of the anti-theft device. In another embodiment of the invention locking engagement is achieved by the retaining member being moved to a position inside the coupler receptacle through operation of a lever independent of the retaining member and being held in such position through operation of a lock housed in the body of the anti-theft device. No tools or auxiliary parts are required to attach or remove the device.

Abstract: A grasping apparatus and method wherein the apparatus includes a sleeve with a shaft therein and a clamping member on one or both ends of the sleeve for opening and closing. A locking member is positioned on the sleeve for locking the sleeve to the shaft. When unlocked, movement of the shaft within the sleeve or the sleeve along the shaft actuates movement of the clamping member.