Abstract: A door latch for securing a door of a building in a closed condition, the door latch including a housing, a handle rod, a lock set assembled into the housing and including a movable key tab, a main lock pivotally connected to the handle rod and including a connecting slot, the main lock being movable for lifting an engagement end, an unlocking latch pivotally connected to the handle rod and including an engagement structure for coupling with the connecting slot and a lock bar assembled to the housing and being movable relative to the housing between a locked position and an unlocked position. Wherein, when the lock bar is in the locked position, the main lock is not pivotable from a position exterior to the building by the use of the handle rod, the main lock being pivotable from a position interior to the building by manual lifting.

Abstract: A door latch for securing a door of a building in a closed condition, the door latch including a housing, a handle rod, a lock set assembled into the housing and including a movable key tab, a main lock pivotally connected to the handle rod and including a connecting slot, the main lock being movable for lifting an engagement end, an unlocking latch pivotally connected to the handle rod and including an engagement structure for coupling with the connecting slot and a lock bar assembled to the housing and being movable relative to the housing between a locked position and an unlocked position. Wherein, when the lock bar is in the locked position, the main lock is not pivotable from a position exterior to the building by the use of the handle rod, the main lock being pivotable from a position interior to the building by manual lifting.