A lifting apparatus for lifting manufacturing rings is provided. , is formed by a security mechanism, which facilitates a repeat locking after activation of the armament. A conductive terminal is electrically connected with the electric wire, and inserted into a terminal insertion hole formed in the waterproof connector housing together with the waterproof plug to seal the terminal insertion hole. The controller being further configured to determine that the object is a trailer in the event the first distance between the object and the vehicle has not decreased while the vehicle is in reverse.