Patent ID: 7909351

Claim:
A trailer coupling dock theft-proof lock, comprising a locking dock, a coupling assembly and a lock assembly, wherein: the locking dock has a body with a deck formed thereon and a slider room formed inside; the deck having a slot and a latch chamber, the body having a core chamber at the bottom thereof communicating with the latch chamber; the coupling assembly includes: a slider which has at least one latch hole, a through hole and a coupling hole, and is retained on the locking dock through a pin running through the slot to engage with the through hole; and a ball seat which is coupled with the slider and held in a corresponding dome of a trailer coupling dock and replaceable according to the size of the dome; and the lock assembly includes: a core which is held in the core chamber and has a bolt at a rear end thereof; an elastic element held in the latch chamber of the locking dock; and a latch element which is held in the latch chamber and has the bottom thereof pushed by the elastic element and a bolt chamber and an upper section extended into the latch hole of the slider.