SLIDING RAIL ASSEMBLY

A sliding rail assembly includes an outer rail, a middle rail, and an inner rail that are matched with one another, and a self-locking device matched with the inner rail. The self-locking device includes a fixed block and a sliding block moving with respect to the fixed block, a sliding slot provided for the sliding block to slide is disposed on the fixed block, and a sliding block limiting slot is disposed on the sliding block. A spring extends in the sliding slot, and has one end connected to the bottom of the sliding block, and the other end fastened to the fixed block. A clamping portion and a limiting slot are disposed on the fixed block to match with a sliding block clamping portion- and a sliding block limiting portion disposed on the sliding block.

DETAILED DESCRIPTION OF THE INVENTION

The present invention is further illustrated through accompanying drawings.

As shown inFIG. 1toFIG. 3, a sliding rail assembly according to the present invention includes an outer rail10, a middle rail20, and an inner rail30that are matched with one another, and a self-locking device matched with the inner rail. The self-locking device includes a fixed block40and a sliding block50moving relative to the fixed block, the fixed block is fixed through clamping by mounting limiting blocks42at two symmetric portions, at the same time, a sliding slot47provided for the sliding block to slide is disposed on the fixed block, and a slide limiting slot51is disposed on the sliding block. Springs48extend in the sliding slot, and each have one end connected to the bottom of the sliding block, and the other end fastened to the fixed block; the two springs are disposed in parallel, and are fixed in a fixed seat through engaging with a spring engagement slot49. A clamping portion and a limiting slot43are disposed on the fixed block, so as to match with a sliding block clamping portion52and a sliding block limiting portion53disposed on the sliding block. A buffer41is further disposed at the front end of the fixed block. After the sliding rail is assembled, the buffer ensures that the fixed block and the sliding block are not damaged when a middle rail of an object is pushed back, thereby having a shock absorption and buffer effect. Specifically, the clamping portion on the fixed block includes a first clamping portion44and a second clamping portion46, the first clamping portion and the second clamping portion are protruded on the surface of the fixed block, and has a distance there-between slightly greater than the width of the sliding block clamping portion52; a sliding guide slot45provided with a slope is disposed between the limiting slot of the fixed block and the first clamping portion; in addition, a clamping block32matched with the sliding block is disposed on the inner rail30, and the clamping block is fixed to the inner rail through a clamping block riveting hole31; the outer rail and middle rail, and the middle rail and inner rail are respectively connected in a sliding manner through balls disposed in an outer ball slot11and an inner ball slot21.

During use, the fixed seat of the self-locking device is riveted to the outer rail through the clamping block32with rivets. When a drawer is pulled, the sliding rail is pulled out, that is to say, the inner rail assembly is pulled to move, and at this time, the clamping block32on the inner rail assembly is engaged in an engagement slot of the sliding block50, the sliding block50moves along the sliding slot46under the pulling force, and when the spring is at the maximum displacement, the sliding block limiting portion53on the sliding block presses against the limiting slot on the fixed seat, and at the same time, the sliding block clamping portion52is located between the first clamping portion44and the second clamping portion46of the fixed seat, the sliding block50is locked at the position through fixed engagement; at the same time, the clamping block32on the inner rail leaves the sliding block engagement slot, and then the inner rail slides freely until the drawer is pulled to the maximum extending length of the sliding rail. When the drawing is closed, that is, the inner rail assembly moves backwards slowly, the clamping block32on the inner rail assembly is first engaged with the clamping block engagement slot on the sliding block50, and the sliding block50is pushed out of the locking point under a small pushing force. At the same time, the clamping block32on the inner rail assembly is affected by the pulling force of the spring, so that the sliding block50springs back together with the inner rail of the sliding rail, thereby achieving the function of automatic locking. When the drawing is pulled open, the sliding block50is impacted, and the sliding block50may actively jump from the clamping portion of the fixed seat, so that the sliding block automatically springs back under the pulling force of the spring, and the self-locking device fails. At this time, the inner rail assembly can still be pushed to slide, and when the clamping block32is pushed to the stop position, that is, the self-locking closed state, of the sliding block50, and the clamping block32is forcedly pushed to the engagement slot of the sliding block50, the clamping block is engaged, and the self-locking device restores the normal function. Because the sliding block50and the clamping block32both have a certain slope at the front end thereof, the sliding block50and the clamping block32are protected from being damaged when the clamping block32is forcedly pushed back.

Compared with the prior art, the movement of the sliding block50is limited by both the sliding slot47of the fixed seat and the slide limiting slot51on the sliding block, the matching with the fixed seat is stable and cannot be easily deformed, and can be locked firmly; when being moved or being affected by an external force, the object using the sliding rail can remain stable, safe and reliable.