Slide rail device

By designing a locking mechanism and an outer stop in the slide rail device, combined with the pivoting of the locking mechanism driven by the inner rail and the locking mechanism to prevent the middle rail from retracting, the safety hazard caused by the protruding middle rail is solved, and operational safety and smoothness are achieved.

CN223626153UActive Publication Date: 2025-12-02FIRST DOME
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Patent Information

Application Number
CN202422679799.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-04
Publication Date
2025-12-02
Estimated Expiration
2034-11-04

AI Technical Summary

Technical Problem

In existing sliding rail devices, the middle rail tends to protrude relative to the outer rail during server chassis operation, which can cause users to be scratched and poses a safety hazard.

Method used

A slide rail device is designed, in which the middle rail unit prevents the middle rail from moving relative to the outer rail through the blocking relationship between the middle rail and the outer stop block. The inner rail drives the locking member to pivot and release the blocking relationship, and the middle rail moves between the retracted and extended positions. The locking member prevents the middle rail from retracting. The connecting rod and the operating member cooperate to achieve safe operation.

Benefits of technology

This effectively prevents the middle rail from protruding from the outer rail during operation, increasing operational safety, avoiding scratches to users, and ensuring the smooth pulling out and retraction of the server chassis.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN223626153U_ABST
    Figure CN223626153U_ABST
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Abstract

A sliding rail device comprises an outer rail unit, a middle rail unit and an inner rail unit. The outer rail unit comprises an outer rail, and the outer rail is provided with an outer first end, an outer second end opposite to the outer first end and at least one outer stop block adjacent to the outer second end. The middle rail unit comprises a middle rail movably arranged on the outer rail and a clamping piece pivoted to the middle rail, the middle rail is provided with a middle first end adjacent to the outer first end and a middle second end opposite to the middle first end, and the clamping piece can be stopped by the outer stop block to prevent the middle rail from moving relative to the outer rail. The inner rail unit comprises an inner rail movably arranged on the middle rail and a driving piece arranged on the inner rail, and when the inner rail moves from the first middle end to the second middle end, the driving piece can push the clamping piece to pivot upwards so as to release the blocking relation between the clamping piece and the outer check block.
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Description

Technical Field

[0001] This utility model relates to a slide rail device, and more particularly to a slide rail device that increases operational safety. Background Technology

[0002] An existing sliding rail device includes an outer rail, a middle rail movably disposed on the outer rail, and an inner rail movably disposed on the middle rail, the inner rail being used to mount a server chassis. The inner rail is shorter than the middle rail, less than half the length of the middle rail. When the user pulls out the server chassis, the inner rail moves relative to the middle rail, which in turn pulls the middle rail out relative to the outer rail. However, before the inner rail is pulled out relative to the middle rail, the middle rail already protrudes relative to the outer rail. This situation easily causes the user to be scratched by the middle rail during operation, raising safety concerns. Therefore, there is room for improvement. Utility Model Content

[0003] The purpose of this invention is to provide a slide rail device that can solve at least one of the above-mentioned problems.

[0004] This utility model relates to a slide rail device suitable for server chassis installation. The slide rail device includes an outer rail unit, comprising an outer rail having an outer first end, an outer second end opposite to the outer first end, and at least one outer stop block adjacent to the outer second end; a middle rail unit, comprising a middle rail movably disposed on the outer rail and a locking member pivotally disposed on the middle rail, the middle rail having a middle first end adjacent to the outer first end and a middle second end opposite to the middle first end, the locking member being stopped by the outer stop block to prevent the middle rail from moving relative to the outer rail; and an inner rail unit, comprising an inner rail movably disposed on the middle rail and suitable for server chassis installation, and a driving member disposed on the inner rail, wherein when the inner rail moves from the middle first end to the middle second end, the driving member can push against the locking member and pivot upward to release the blocking relationship between the locking member and the outer stop block.

[0005] The slide rail device of this utility model has a middle outer surface facing the outer rail and a middle inner surface opposite to the middle outer surface and facing the inner rail. The locking member has a pivot portion pivotally disposed on the middle outer surface and a locking portion connecting the pivot portion through the middle rail and protruding from the middle inner surface. The pivot portion can be stopped by the outer stop block, and the locking portion can be pushed by the driving member to make the locking member pivot upward.

[0006] The slide rail device of this utility model further includes a locking member that connects to the pivot portion extending away from the second end of the middle rail, and the middle rail also forms a locking movable groove. The middle rail unit further includes a locking elastic member that connects to the joint portion and is disposed in the locking movable groove.

[0007] The slide rail device of this utility model has an inner surface facing the middle rail, and a driving member has a body part disposed on the inner surface and a locking part extending upward from the body part. Both the body part and the locking part can push the locking part upward to pivot and release the blocking relationship between the locking part and the outer stop block.

[0008] The slide rail device of this utility model has a middle rail that can move between a retracted position and an extended position, and an inner rail that can move from a first end to a second end. When the middle rail is in the retracted position and the inner rail has moved to the second end, the middle rail overlaps with the outer rail, and the locking part stops at the locking part. When the driving member releases the locking part from the outer stop, the middle rail can move from the retracted position to the extended position. During the process of the middle rail returning from the extended position to the retracted position, the inner rail can synchronously drive the middle rail to move by being stopped at the locking part by the locking part.

[0009] The slide rail device of this utility model further includes a locking member pivotally mounted on the middle rail unit. The middle rail can move between a retracted position and an extended position. In the retracted position, the middle rail overlaps with the outer rail, and the locking member is stopped by the outer stop block. When the driving member releases the blocking relationship between the locking member and the outer stop block, the middle rail can move from the retracted position to the extended position. In the extended position, the locking member can be stopped by the outer stop block to prevent the middle rail from retracting relative to the outer rail.

[0010] The slide rail device of this utility model has a middle outer surface facing the outer rail and a middle inner surface opposite to the middle outer surface and facing the inner rail. The locking member has an abutting part pivotally disposed on the middle outer surface, a connecting part connecting the abutting part and a locking part extending downward from the connecting part. The locking part can be stopped by the outer stop block to prevent the middle rail from retracting relative to the outer rail.

[0011] The slide rail device of this utility model further includes a connecting rod movably disposed outside the middle rail unit and a pushing member movably disposed outside the middle rail and abutting the connecting rod. The pushing member can be operated to push the connecting rod to move toward the first end of the middle rail, thereby pushing the locking member to pivot, so as to release the blocking relationship between the locking part and the outer stop block.

[0012] In the slide rail device of this utility model, the connecting rod forms a pushing inclined surface, and the abutting part forms an abutting inclined surface corresponding to the pushing inclined surface. The pushing inclined surface can contact the abutting inclined surface to cause the abutting part to pivot downward and the locking part to pivot upward.

[0013] The slide rail device of this utility model further includes a locking movable groove formed by the middle rail, and the middle rail unit further includes a locking elastic element that connects to the connecting part and is disposed in the locking movable groove.

[0014] The slide rail device of this utility model further includes a middle rail unit that is disposed on the middle rail and extends from the inner surface away from the inner surface of the middle rail. The inner rail unit further includes an operating member that is pivotally disposed on the inner rail. The operating member can be blocked by the middle rail to prevent the inner rail from extending relative to the middle rail. The operating member can be operated to pivot downward to release the blocking relationship with the middle rail.

[0015] The slide rail device of this utility model has an operating member having a pivot portion pivotally mounted on the inner rail, an operating portion extending from the pivot portion toward the second end of the inner rail and protruding from the inner rail, and a locking portion extending upward from the pivot portion. The locking portion can be stopped by the middle stop member, and the operating portion can be operated to pivot downward to release the blocking relationship between the locking portion and the middle stop member.

[0016] The beneficial effects of this utility model are as follows: the locking component of the middle rail unit can be stopped by the outer stop block to prevent the middle rail from moving relative to the outer rail. This ensures that when the user pulls the server chassis and the inner rail, the middle rail will not move relative to the outer rail and protrude from the outer rail, thus preventing the user from being scratched by the middle rail during operation and increasing operational safety. Attached Figure Description

[0017] Figure 1 This is a perspective view of one embodiment of the slide rail device of this utility model;

[0018] Figure 2 This is an exploded perspective view of the embodiment described above;

[0019] Figure 3 This is an exploded perspective view of an outer track unit of the embodiment described above;

[0020] Figure 4 This is a perspective view of a middle track unit in the embodiment described above;

[0021] Figure 5 This is an exploded perspective view of the middle track unit in the embodiment described above;

[0022] Figure 6 This is an incomplete exploded perspective view of the middle track unit in the embodiment described above;

[0023] Figure 7 This is an incomplete exploded perspective view of the middle track unit in the embodiment described above;

[0024] Figure 8 This is an exploded perspective view of an inner rail unit of the embodiment described above;

[0025] Figure 9 This is a perspective view of the embodiment, illustrating that an inner rail of the inner rail unit moves to a second end of the middle rail unit;

[0026] Figure 10 This is an incomplete rear view of the embodiment, illustrating that the latching element is blocked by the outer stop;

[0027] Figure 11 This is an incomplete front view of the embodiment, illustrating that the driving member abuts against the locking member;

[0028] Figure 12 This is an incomplete rear view of the embodiment, illustrating that the driving member abuts against the locking member;

[0029] Figure 13 This is an incomplete front view of the embodiment, illustrating that the driving member pushes against the locking member and pivots upward;

[0030] Figure 14 This is an incomplete rear view of the embodiment, illustrating that the driving member pushes against the locking member and pivots upward;

[0031] Figure 15 This is an incomplete front view of the embodiment, illustrating that the inner rail moves to the second end, and the driving part of the driving member abuts against the locking member;

[0032] Figure 16 This is a perspective view of the embodiment, illustrating the movement of the middle rail to the extended position;

[0033] Figure 17 This is an incomplete rear view of the embodiment, illustrating that the locking member is stopped by the outer stop when in the extended position;

[0034] Figure 18 This is an incomplete rear view of the embodiment, illustrating that in the extended position, the locking member is pushed and pivoted by the connecting rod to release its blocking relationship with the outer stop.

[0035] Figure 19 This is an incomplete front view of the embodiment, illustrating that the operating member is blocked by the middle stop member when in the extended position;

[0036] Figure 20 This is an incomplete front view of the embodiment, illustrating that in the extended position, the operating member is operated to pivot downwards to release its blocking relationship with the middle stop member;

[0037] Figure 21 This is an incomplete rear view of the embodiment, illustrating that during the process of the middle rail returning from the extended position to the retracted position, the pivot part of the locking member is pushed upward by the outer stop block, thereby releasing the locking relationship between the locking part and the driving part of the driving member. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0040] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0042] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0043] See Figure 1 and Figure 2 An embodiment of the slide rail device 10 of this utility model is applicable to installation in a server chassis (not shown) or other equipment. The slide rail device 10 includes an outer rail unit 1, a middle rail unit 2, and an inner rail unit 3.

[0044] The outer rail unit 1 includes an outer rail 11, an outer stop 12 disposed on the outer rail 11, two beaded strips 13 disposed on the outer rail 11, and two outer support members 14 disposed on the outer rail 11. The outer rail 11 has a movable surface 111, an outer first end 112, an outer second end 113 opposite to the outer first end 112, and two outer stops 114 adjacent to the outer second end 113. The outer stops 114 are arranged at intervals along the length direction of the outer rail 11. The outer stop 12 is adjacent to the outer first end 112 and is used to prevent the middle rail unit 2 from detaching from the outer rail 11 from the outer first end 112. The beaded strips 13 are used to make the middle rail unit 2 slide more smoothly relative to the outer rail 11, and the outer support members 14 are adjacent to the outer second end 113 and are used to provide support when the middle rail unit 2 extends relative to the outer rail 11.

[0045] See Figure 2 , Figure 4 and Figure 5 The middle rail unit 2 includes a middle rail 21 movably disposed on the outer rail 11, a locking member 22 pivotally disposed on the middle rail 21, a locking elastic member 23 connected to the locking member 22, a locking member 24 pivotally disposed on the middle rail 21, a locking elastic member 25 connected to the locking member 24, a connecting rod 26 movably disposed on the middle rail 21, a connecting rod elastic member 27 connected to the connecting rod 26, a pushing member 28 movably disposed on the middle rail 21 and abutting against the connecting rod 26, and a middle stop member 29 disposed on the middle rail 21. The middle rail 21 has a middle outer surface 211 facing the outer rail 11 and a middle inner surface 212 opposite to the middle outer surface 211 and facing the inner rail unit 3, a middle first end 213 adjacent to the outer first end 112 and a middle second end 214 opposite to the middle first end 213, and forms a locking groove 215 and a locking groove 216.

[0046] See Figures 5 to 7 and Figure 10The locking member 22 has a pivot portion 221 pivotally mounted on the outer surface 211, a connecting portion 222 extending from the pivot portion 221 away from the second end 214, and a locking portion 223 extending from the pivot portion 221 through the middle rail 21 and protruding from the inner surface 212. The locking elastic member 23 connects to the connecting portion 222 and is disposed in the locking movable groove 215. The locking member 24 can be stopped by the outer stop 114 to prevent the middle rail 21 from retracting relative to the outer rail 11, and has an abutment portion 241 pivotally mounted on the outer surface 211, a connecting portion 242 connecting the abutment portion 241, and a locking portion 243 extending downward from the connecting portion 242. The locking portion 243 can be stopped by the outer stop 114 to prevent the middle rail 21 from retracting relative to the outer rail 11. The locking elastic element 25 is connected to the connecting part 242 and disposed in the locking movable groove 216. The connecting rod 26 is movably disposed on the outer surface 211 and forms a pushing slope 261 and a hook part 262. One end of the connecting rod elastic element 27 is connected to the hook part 262, and the other end is connected to the middle rail 21. The abutting part 241 forms an abutting slope 241a corresponding to the pushing slope 261 (see...). Figure 17 The pushing ramp 261 can contact the abutting ramp 241a, causing the abutting part 241 to pivot downwards and the locking part 243 to pivot upwards. The pushing member 28 is movably disposed on the outer surface 211 and abuts against the connecting rod 26. The pushing member 28 can be operated to push the connecting rod 26 toward the first end 213, thereby pushing the locking member 24 to pivot, so as to release the blocking relationship between the locking part 243 and the outer stop block 114. The middle stop member 29 is disposed on the middle rail 21 and passes through the middle rail 21, protruding from the inner surface 212 and extending away from the inner surface 212.

[0047] See Figure 2 and Figures 8 to 12The inner rail unit 3 includes an inner rail 31 movably disposed on the middle rail 21 and adapted for mounting on the server chassis, a driving member 32 disposed on the inner rail 31, an operating member 33 pivotally disposed on the inner rail 31, and an operating elastic member 34 connected to the operating member 33. The inner rail 31 has an inner surface 311 facing the middle rail 21. The driving member 32 has a generally elongated body portion 321 disposed on the inner surface 311 and a locking portion 322 extending upward from the body portion 321. Both the body portion 321 and the locking portion 322 can push against the locking portion 223 and pivot upward to release the blocking relationship between the locking portion 223 and the outer stop block 114. The operating member 33 has a pivot portion 331 pivotally mounted on the inner rail 31, an operating portion 332 extending from the pivot portion 331 toward the second end 214 and protruding from the inner rail 31, a locking portion 333 extending upward from the pivot portion 331, and a hook portion 334 connected to the pivot portion 331. One end of the operating elastic member 34 is connected to the hook portion 334, and the other end is connected to the middle rail 21.

[0048] See Figure 1 , Figures 9 to 14 The locking member 22 can be stopped by the outer stop 114 to prevent the middle rail 21 from moving relative to the outer rail 11. During the movement of the inner rail 31 from the first end 213 to the second end 214, the driving member 32 can push against the locking member 22 and pivot upwards to release the blocking relationship between the locking member 22 and the outer stop 114. Specifically, the body 321 of the driving member 32 will first abut against the locking part 223, such as... Figure 11 and Figure 12 As shown, during the movement, the main body 321 pushes upward against the locking part 223 and pivots upward. Then, the locking part 322 further pushes upward against the locking part 223, releasing the blocking relationship between the locking member 22 and the outer stop block 114. Figure 13 and Figure 14 As shown. Finally, when the inner rail 31 moves to the second end 214, the locking part 322 of the driving member 32 engages with the locking part 223, preventing the inner rail 31 from retracting relative to the middle rail 21, as shown. Figure 15 As shown.

[0049] See Figure 9 and Figure 16The middle rail 21 is movable between a retracted position and an extended position. In the retracted position, the middle rail 21 overlaps with the outer rail 11, and the locking member 22 is stopped by the outer stop block 114. When the driving member 32 releases the blocking relationship between the locking member 22 and the outer stop block 114, the middle rail 21 can move from the retracted position to the extended position. The locking member 22 of the middle rail unit 2 is stopped by the outer stop block 114 to prevent the middle rail 21 from moving relative to the outer rail 11. This ensures that when the user pulls the server chassis and the inner rail 31, the middle rail 21 will not move relative to the outer rail 11 and protrude from the outer rail 11, preventing the user from being scratched by the middle rail 21 during operation and increasing operational safety. The blocking relationship between the locking member 22 and the outer stop block 114 can only be released when the driving member 32 of the inner rail unit 3 pushes the locking member 22 to pivot upward. At this time, the inner rail 31 has moved to the vicinity of the second end 214 and can be pulled out continuously relative to the outer rail 11 along with the middle rail 21 without the risk of being scratched by the protruding middle rail 21.

[0050] See next Figure 17 and Figure 18 In the extended position, the locking member 24 can be stopped by the outer stop 114 to prevent the middle rail 21 from retracting relative to the outer rail 11, and the pushing member 28 can be operated to push the connecting rod 26 toward the first end 213, thereby pushing the locking member 24 to pivot. The pushing inclined surface 261 can contact the abutting inclined surface 241a to make the abutting part 241 pivot downward and the locking part 243 pivot upward, so as to release the blocking relationship between the locking part 243 and the outer stop 114.

[0051] See Figure 8 , Figure 19 and Figure 20 The engaging portion 333 can be stopped by the middle stop 29 to prevent the inner rail 31 from extending relative to the middle rail 21. The operating portion 332 can be pivoted downwards to release the blocking relationship between the engaging portion 333 and the middle stop 29. In this way, the user can further pull the server chassis (not shown) and the inner rail 31 to extend and separate completely relative to the middle rail 21 for maintenance or replacement. See also... Figure 21After the server chassis is maintained or replaced, during the process of the user pushing back the server chassis and the inner rail 31, that is, during the process of the middle rail 21 returning from the extended position to the retracted position, the inner rail 31 can move synchronously by being stopped by the locking part 322 through the locking part 223. And because the locking part 322 of the driving part 32 is continuously locked with the locking part 223, the inner rail 31 cannot retract relative to the middle rail 21, so the middle rail 21 will retract synchronously with the server chassis and the inner rail 31 relative to the outer rail 11. After the pusher 28 is operated to release the blocking relationship between the locking part 243 and the outer stop block 114, the middle rail 21 can retract relative to the outer rail 11 until the pivoting part 221 of the locking member 22 abuts against the outer stop block 114 and is pushed upward by the outer stop block 114, causing the locking part 223 to pivot upward and release the blocking relationship with the locking part 322. At this time, the server chassis and the inner rail 31 can retract relative to the middle rail 21 so that the inner rail 31 does not protrude from the middle second end 214 of the middle rail 21, and the middle rail 21 returns to the retracted position. Figure 9 As shown. Finally, by continuously pushing the server chassis and the inner rail 31 towards the first end 213, the server chassis and the inner rail 31 can return to the position shown. Figure 1 The initial position. This design means that before the user closes the inner rail 31, the middle rail 21 must first be closed relative to the outer rail 11. In this way, during the process of closing the inner rail 31 from the second end 214 to the first end 213, the middle rail 21 will not protrude from the outer rail 11. This also prevents the user from being scratched by the protruding middle rail 21 during the operation of closing the inner rail 31, thus increasing operational safety.

[0052] In summary, the sliding rail device 10 of this utility model, through the locking member 22 of the middle rail unit 2, can be stopped by the outer stop block 114 to prevent the middle rail 21 from moving relative to the outer rail 11. This ensures that when the user pulls the server chassis and the inner rail 31, the middle rail 21 will not move relative to the outer rail 11 and protrude from the outer rail 11, thus preventing the user from being scratched by the middle rail 21 during operation and increasing operational safety. The blocking relationship between the locking member 22 and the outer stop block 114 is released only when the driving member 32 of the inner rail unit 3 pushes against the locking member 22 and pivots upward. At this time, the inner rail 31 has moved to the vicinity of the second end 214 of the middle rail and can then be continuously pulled out relative to the outer rail 11 along with the middle rail 21 without the risk of being scratched by the protruding middle rail 21. Therefore, this utility model effectively achieves its purpose.

Claims

1. A slide rail device suitable for installation on a server chassis; characterized in that: The slide rail device includes: An outer rail unit includes an outer rail having an outer first end, an outer second end opposite to the outer first end, and at least one outer stop block adjacent to the outer second end; The middle rail unit includes a middle rail movably disposed on the outer rail and a locking member pivotally disposed on the middle rail. The middle rail has a middle first end adjacent to the outer first end and a middle second end opposite to the middle first end. The locking member can be stopped by the outer stop block to prevent the middle rail from moving relative to the outer rail. and The inner rail unit includes an inner rail that is movably disposed on the middle rail and is suitable for installation in the server chassis, and a driving member disposed on the inner rail. When the inner rail moves from the first end to the second end, the driving member can push against the locking member and pivot upward to release the blocking relationship between the locking member and the outer stop block.

2. The slide rail device according to claim 1, characterized in that: The middle rail also has an outer surface facing the outer rail and an inner surface opposite to the outer surface and facing the inner rail. The locking member has a pivot portion pivotally disposed on the outer surface and a locking portion connecting the pivot portion through the middle rail and protruding from the inner surface. The pivot portion can be stopped by the outer stop block, and the locking portion can be pushed by the driving member to make the locking member pivot upward.

3. The slide rail device according to claim 2, characterized in that: The locking component further includes a connecting portion extending from the pivot portion away from the second end of the middle rail, the middle rail also forms a locking movable groove, and the middle rail unit further includes a locking elastic element connecting the connecting portion and disposed in the locking movable groove.

4. The slide rail device according to claim 2, characterized in that: The inner rail has an inner surface facing the middle rail. The driving member has a body part disposed on the inner surface and a locking part extending upward from the body part. Both the body part and the locking part can push the locking part upward to pivot and release the blocking relationship between the locking part and the outer stop block.

5. The slide rail device according to claim 4, characterized in that: The middle rail can move between a retracted position and an extended position. The inner rail can move from the first end to the second end. When the middle rail is in the retracted position and the inner rail has moved to the second end, the middle rail overlaps with the outer rail, and the locking part stops at the locking part. When the driving member releases the locking part from the outer stop, the middle rail can move from the retracted position to the extended position. During the process of the middle rail returning from the extended position to the retracted position, the inner rail can synchronously drive the middle rail to move by being stopped at the locking part by the locking part.

6. The slide rail device according to claim 1, characterized in that: The middle rail unit also includes a locking member pivotally mounted on the middle rail. The middle rail is movable between a retracted position and an extended position. In the retracted position, the middle rail overlaps with the outer rail, and the locking member is stopped by the outer stop block. When the driving member releases the blocking relationship between the locking member and the outer stop block, the middle rail can move from the retracted position to the extended position. In the extended position, the locking member is stopped by the outer stop block to prevent the middle rail from retracting relative to the outer rail.

7. The slide rail device according to claim 6, characterized in that: The middle rail also has an outer surface facing the outer rail and an inner surface opposite to the outer surface and facing the inner rail. The locking member has an abutment portion pivotally mounted on the outer surface, a connecting portion connecting the abutment portion, and a locking portion extending downward from the connecting portion. The locking portion can be stopped by the outer stop block to prevent the middle rail from retracting relative to the outer rail.

8. The slide rail device according to claim 7, characterized in that: The middle rail unit also includes a connecting rod movably disposed outside the middle rail and a pushing member movably disposed outside the middle rail and abutting the connecting rod. The pushing member can be operated to push the connecting rod towards the first end of the middle rail, thereby pushing the locking member to pivot, so as to release the blocking relationship between the locking part and the outer stop block.

9. The slide rail device according to claim 8, characterized in that: The connecting rod forms a pushing slope, and the abutting part forms an abutting slope corresponding to the pushing slope. The pushing slope can contact the abutting slope to cause the abutting part to pivot downward and the locking part to pivot upward.

10. The slide rail device according to claim 7, characterized in that: The middle rail also forms a locking groove, and the middle rail unit further includes a locking elastic element that connects to the connecting part and is disposed in the locking groove.

11. The slide rail device according to claim 2, characterized in that: The middle rail unit further includes a middle stop member disposed on the middle rail and extending away from the inner surface of the middle rail. The inner rail unit further includes an operating member pivotally disposed on the inner rail. The operating member can be stopped by the middle stop member to prevent the inner rail from extending relative to the middle rail. The operating member can be operated to pivot downward to release the stopping relationship with the middle stop member.

12. The slide rail device according to claim 11, characterized in that: The operating member has a pivot portion pivotally mounted on the inner rail, an operating portion connecting the pivot portion and extending toward the second end of the inner rail and protruding from the inner rail, and a locking portion extending upward from the pivot portion. The locking portion can be stopped by the middle stop member, and the operating portion can be operated to pivot downward to release the blocking relationship between the locking portion and the middle stop member.