Abstract: A trailer coupler lock includes a coupler lock body and pin body assembly. The lock body retains the pin body assembly and slides horizontally onto a trailer coupler. When the lock body is in position under the trailer coupler, the pin body assembly is slid upward through the lock body and a protruding pin section of the pin body passes via a top hole in the pin body to enter into the coupler ball socket. While the pin body is in this position, a key is utilized to slide a shackle on the pin body assembly through a hasp on the lock body thereby blocking retraction of the pin body and locking the whole assembly together onto the trailer coupler. In this locked position, the protruding pin section of the pin body secures the coupler lock body to the trailer coupler and prevents an unwanted union with a trailer hitch.

Abstract: A trailer coupler lock includes a coupler lock body and pin body assembly. The lock body retains the pin body assembly and slides horizontally onto a trailer coupler. When the lock body is in position under the trailer coupler, the pin body assembly is slid upward through the lock body and a protruding pin section of the pin body passes via a top hole in the pin body to enter into the coupler ball socket. While the pin body is in this position, a key is utilized to slide a shackle on the pin body assembly through a hasp on the lock body thereby blocking retraction of the pin body and locking the whole assembly together onto the trailer coupler. In this locked position, the protruding pin section of the pin body secures the coupler lock body to the trailer coupler and prevents an unwanted union with a trailer hitch.