Accessory lock assembly

An accessory lock assembly for locking a door panel, which has a lock cavity, to a door frame in a pivotally movable manner, wherein said accessory lock assembly comprises:

• a latch assembly comprising a latch actuation member for transversely supporting within the lock cavity and a locking latch slidably extended from said latch actuation member between a locked position and an unlocked position, wherein at said locked position, said locking latch is outwardly slid adapted for engaging with the door frame so as to lock up the door panel within the door frame, and at said unlocked position, said locking latch is inwardly slid adapted for receiving in the lock cavity such that the door panel is allowed to be pivotally moved with respect to the door frame;
• an outer knob assembly, which is adapted for mounting on an outer side of the door panel, comprising an outer actuation unit connected to said latch assembly to actuate said locking latch to slidably move between said locked position and said unlocked position;
• an inner knob assembly, which is adapted for mounting on an inner side of the door panel, comprising an inner actuation unit connected to said latch assembly to actuate said locking latch to slidably move between said locked position and said unlocked position, a protection shelter having a receiving cavity receiving said inner actuation unit therein, and at least a security binding element having a securing end connected to said outer knob assembly and an opposed operating end securely connected to said inner actuation unit within said receiving cavity of said protection shelter in such a manner that said operating end of said security binding element is isolated from outside of said accessory lock assembly by said protection shelter;
• and
• a lock reinforcing arrangement, which is adapted for substantially supporting at the lock cavity, being engaged with said outer knob assembly so as to block a rotational movement of said outer knob assembly with respect to the lock cavity of the door panel.