Abstract: A locking mechanism for a window guard system is disclosed. The window guard is mounted about the exterior of a window to its frame. The window guard is designed to be have the capability to be opened from the inside. A locking mechanism with three lock subassemblies is provided. A first locking element includes a sliding rod which immobilizes the second lock. The second locking element includes a position dependent sliding member which secures the third lock. The third lock is a pin which must be appropriately rotated in order to be removed when the second locking element is slid to a specific position. At this point, after opening the three locks comprising the locking mechanism, the window guard may be opened by pushing on the now released side causing rotation about the hinge members on the other side. The locking mechanism must be opened in a specific order in order to open the window guard. Once the window guard has been opened, one may egress the building or clean the window or window guard assembly.