Abstract: A reinforcing structure of a latch of an auxiliary lock includes a lock tongue set having a lock tongue provided with at least one flat surface. A reinforcing plate is fixed in the gap between the flat surface of the lock tongue and the housing, so that the housing may withstand and support a larger external impact force.

Abstract: A strength reinforcing structure of a lock outer handle includes a disk seat defining a first hole rotatably receiving a handle and a drive shaft tube. The handle has a drive plate rotated by a lock core to drive a lock snapping plate to move longitudinally. The drive shaft tube has one end secured in the handle, and the other end provided with locking grooves for securing locking blocks of a driven ring which is combined with a drive tube which is combined with a restoring member which defines fitting slots combined on the drive shaft tube. The drive tube passes through a positioning plate which defines a second hole provided with locking edges engaged or disengaged with end edges of the lock snapping plate.