Internal locking device for drawer slide rail

Internal locking device for drawer slide rail, when a drawer is drawn out, said locking device preventing other drawers from being drawn out, said locking device comprising:

• a first slide rail assembly and a second slide rail assembly, the second slide rail assembly corresponding to the first slide rail assembly and being parallelly positioned above the first slide rail assembly, the first and second slide rail assemblies respectively including a stationary slide rail and a set of extensible slide rail, the stationary slide rail being a channel body having a bottom wall and two lateral walls, the stationary slide rail being fixed on a cabinet body having at least two vertically arranged drawers, each extensible slide rail including a drawer slide rail which is a channel body having a bottom wall and two lateral walls, the drawer slide rail being fixed on a drawer, the drawer slide rail being slidably disposed in the stationary slide rail and extensible from a front end of the stationary slide rail;
• and
• a first activator, a second activator and a shaft rod disposed on the first and second slide rail assemblies, the first activator being disposed at front end of the drawer slide rail, the second activator including a pair of base seats and a pair of transmission members, the base seats being spaced from each other by a certain distance, the base seats being correspondingly and vertically slidably disposed at front end of the stationary slide rail, the transmission members being correspondingly pivotally disposed on the stationary slide rail and respectively positioned on the base seats, whereby when one drawer slide rail is extended, the first activator turns the transmission members to further push the base seats, thereafter, the transmission members being engaged with the base seats to stop the base seats from sliding, the shaft rod being disposed between the first and second slide rail assemblies, two ends of the shaft rod being respectively connected with the base seats of the first and second slide rail assemblies.