Patent ID: 8813530

Claim:
A cylinder lock assembly comprising: a latch unit; an outer lock unit which includes an outer rose, an outer handle, an outer drive tube, a latch operating tube, a locking spindle and a locking plate; and an inner lock unit; said outer drive tube being disposed rotatably in said outer rose and connected to said outer handle, said outer drive tube having a pair of axially extending apertures that are opposite to each other; said latch operating tube being connected to said latch unit, and having an enlarged end portion extending into said outer drive tube opposite to said outer handle, said enlarged end portion having a surrounding wall, and a protrusion projecting inwardly and radially from said surrounding wall; said locking spindle disposed axially in said latch operating tube and movable axially between a locked state and an unlocked state, said locking spindle having one end that is inserted into said surrounding wall and that has a pair of opposite locking tongues, extending radially and outwardly through respective said apertures of said outer drive tube, and movable axially within said apertures, said locking tongues being interlockable with said outer rose when said locking spindle is in said locked state; said locking plate being fixed to said locking spindle, said locking plate being positioned transversely relatively to said outer drive tube and sleeved around said locking spindle in abutment with said locking tongues, said locking plate having a hole to permit said locking spindle to extend therethrough, and a radially extending locking part to engage said protrusion and to thereby lock said locking spindle against a movement to said unlocked state from said locked state when said locking spindle is in said locked state; and said inner lock unit including a push button connected to another end of said locking spindle and operable to press and move axially said locking spindle from said unlocked state to said locked state.