Steel ball slot locking mechanism of slide rail

A steel ball retainer locking mechanism of a slide rail, characterized in that the slide rail comprises an outer rail, a steel ball retainer, and an inner rail, and the outer rail is fixed, and the inner rail is movable, and a direction for pulling the inner rail outward with respect to the outer rail is defined as a positive direction, and a direction for pushing the inner rail inward with respect to the outer rail is defined as a negative direction, and the steel ball retainer locking mechanism comprises:

• an engaging block, installed at a center of the steel ball retainer, and further comprising a synchronized engaging block and a locking block separated with an interval apart from each other, wherein the synchronized engaging block comprises a releasing portion extending outwardly from a side corresponding to the outer rail, and a synchronized hook portion extending outwardly from a side corresponding to the inner rail, wherein the locking block comprises a locking portion on a side corresponding to the outer rail, and a propping portion on a side corresponding to the inner rail;
• a release hole, formed on a side of the outer rail facing the steel ball retainer, configured to be corresponsive to the releasing portion, and the releasing portion being latched into the release hole and capable of unsynchronizing the steel ball retainer and the inner rail;
• a locking hook, formed on a side of the outer rail facing the steel ball retainer, and configured to be corresponsive to the locking portion, such that the release hole and the locking hook are separated with an interval apart from each other, wherein the locking hook and the locking portion is capable of locking the steel ball retainer and the outer rail after the locking hook and the locking portion are latched with each other;
• a synchronized hook, formed on a side of the inner rail facing the steel ball retainer, and configured to be corresponsive to the synchronized hook portion, wherein the steel ball retainer and the inner rail are synchronized after the hook portion is latched to the synchronized hook;
• and
• a releasing hook, formed on a side of the inner rail facing the steel ball retainer, and configured to be corresponsive to the propping portion for unlocking the steel ball retainer and the outer rail;
• when the inner rail is pulled outwardly to a predetermined position, the engaging block is abutted by the locking hook, so that the steel ball retainer is maintained at its position and locked, and after the releasing hook pushes the propping portion, a lock is released, and when the inner rail is pulled outwardly, the steel ball retainer is not synchronized, and when the inner rail is pulled outward continuously, the synchronized hook portion is latched to the synchronized hook again to define a compulsory restoration, so that the steel ball retainer restores its original predetermined position to prevent the inner rail from falling out during use.