Counter locking mechanism of side-hung handle lock and side-hung handle lock

According to the back locking mechanism of the side-hung handle lock and the side-hung handle lock, a back locking knob shaft drives a cam push-and-pull piece to rotate by screwing a back locking knob, and when the cam push-and-pull piece rotates, a sliding column moves along an arc-shaped sliding way of a back locking rod base to push the back locking rod base to drive a back locking rod to ascend and descend. Due to the fact that the length of the back locking rod can be set to be long according to needs, the requirement for the lifting stroke of the lifting back locking piece can be lowered, the requirements for the length of the arc-shaped sliding way and the width of the back locking rod base can be lowered, matched installation and use of the back locking rod base and a narrow lock shell are better facilitated, and the back locking rod base can be better suitable for installation and use of a narrow-frame vertical hinged door. According to the side-hung handle lock with the back locking mechanism, the r