Patent 6846002 was granted and assigned to Master Lock Company on January, 2005 by the United States Patent and Trademark Office.
A lock assembly for securing a trailer including a hitch ball, a lock housing, a lock washer and a nut. The lock housing is placed over the lock washer and nut to prevent the nut from turning. A threaded portion of the hitch ball is placed through a hole in the lock housing and through the lock washer and nut to secure the hitch ball. When a trailer coupler is locked to the ball portion of the hitch ball, the trailer and hitch ball are secure from theft.