Patent ID: 8419081

Claim:
A side-hung door or window single latch lock, comprising: a first lock body and a second lock body disposed on an inner side and an outer side of a door or window and sandwiching the door or window in between, the first lock body including a first handle and the second lock body including a second handle; wherein the first lock body further comprises a latch assembly linked to the first handle and controlling opening and closing, and an elastic locking and controlling mechanism respectively linked to the first handle and the second handle to transmissively control the opening and closing of the latch assembly; wherein the first lock body is provided with a double lock switch at one end of the first handle for locking the latch, the double lock switch comprising: a double lock control block movably disposed outside of the first lock body; a double lock limiting piece moveably disposed inside the first lock body and linked to the double lock control block; and a positioning elastic tab disposed outside the first lock body and provided around the double lock limiting piece; wherein, when the door or window is in a closed state, the double lock control block of the double lock switch is pushed up, and the double lock limiting piece moves upwardly along with the double lock control block, whereupon the double lock control block abuts against and locks the first handle outside the first lock body, the first handle cannot be pressed downwardly to rotate; wherein the double lock limiting piece, from inside of the first lock body, abuts against and locks the elastic locking and controlling mechanism, further wherein the elastic locking and controlling mechanism cannot exert pressure on the latch, whereby the latch cannot retract so that the door or window cannot be opened from inside and outside the door or window, thereby achieving a double lock anti-theft effect.