Patent ID: 7806425

Claim:
A trailer hitch comprising: a first coupling member of a trailer and a second coupling member of a vehicle, the first coupling member having first coupling apertures and the second coupling member having second coupling apertures; a locking mechanism extending through the first and second coupling apertures in the first and second coupling members for locking the first and second coupling members together after being hitched, wherein the locking mechanism includes: a locking head, a bolt seat, a retaining element, a latch bolt and an elastic element, wherein: the locking head has a core and a bolt opening formed at one end thereof; the bolt seat has a bolt section and an action section at one end thereof to be inserted and held into the bolt opening, a screw hole at another end thereof, and a positioning rib extending outwards from a rim of the screw hole to be inserted into one of the second coupling apertures; the retaining element is configured to be located internally of the first coupling member and has a body, a hole extending through the body to receive at least a portion of the latch bolt, and a first directing rib and a second directing rib jutting respectively from two opposite rims of the hole, the first directing rib for being inserted into one of the first coupling apertures; the latch bolt has a bolt head at one end and an external thread portion at another end and a retaining portion adjacent to the external thread portion; and the elastic element is coupled on the second directing rib.