Lock device and sliding rail assembly thereof

By using the locking device and its slide rail assembly to switch the position of the locking element through the longitudinal displacement of the moving part, the problem of low locking and unlocking efficiency of the server equipment is solved, achieving efficient locking and unlocking operations and reducing the cost of maintenance and replacement parts.

CN224217046UActive Publication Date: 2026-05-08SUZHOU NANJUN TRADING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SUZHOU NANJUN TRADING CO LTD
Filing Date
2025-01-23
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Existing locking and unlocking mechanisms for server equipment are inefficient in server chassis and rack connections, and are also costly to maintain.

Method used

The device employs a locking mechanism and its slide rail assembly. By switching the locking mechanism to the locked or unlocked position through the longitudinal displacement of the moving parts, it is integrated into the first rail, which improves the degree of freedom of displacement. The base or moving parts can be replaced to compensate for insufficient length and reduce maintenance costs.

Benefits of technology

It enables precise locking and unlocking of locks, improves the operating efficiency of server equipment, and reduces the cost of maintenance and replacement parts.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a lock device and a slide rail assembly thereof, and the lock device comprises a seat body and a slide rail assembly, the movable part is movably connected to the seat body; the locking piece is arranged on the movable piece, and when the movable piece is adjusted between a first longitudinal position and a second longitudinal position of the seat body to perform longitudinal displacement, the locking piece is fixed at a locking position along with the movable piece at the first longitudinal position, and the locking piece is fixed at the second longitudinal position along with the movable piece at the second longitudinal position. Or the locking piece is fixed at a non-locking position along with the moving piece at the second longitudinal position; the locking piece is provided with a locking position and a non-locking position, the first rail is provided with a first side face and a second side face, the seat body is arranged on the first rail, when the locking piece is fixed at the locking position, the locking piece is located on the side edge of the first side face, or when the locking piece is fixed at the non-locking position, the locking piece is located on the side edge of the second side face.
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Description

Technical Field

[0001] This utility model relates to a locking device and its slide rail assembly, which uses the locking device to lock or unlock the slide rail, and can also be used in servers when combined with a server chassis. Background Technology

[0002] With the mature development of the computer industry and cloud technology, the demand for electronic data access is increasing, especially in artificial intelligence (AI), such as ChatGPT. To meet the massive information access demands, the current server equipment structure consists of multiple server chassis within a server rack. The server chassis and the server rack are connected by a sliding rail structure. For example, each side of the server chassis has a first sliding rail, and each side of the server rack has a second sliding rail relative to the first sliding rail, allowing the first sliding rail to move on the second sliding rail. Summary of the Invention

[0003] The main objective of this invention is to provide a locking device and its slide rail assembly, wherein the locking device uses a movable part to make longitudinal displacement, thereby improving the effectiveness of switching the locking part to the locked position or the unlocked position.

[0004] Another objective of this utility model is to provide a locking device and its slide rail assembly, wherein the locking device is integrated into the first rail, thereby improving the effectiveness of switching the locking member to the locked position or the unlocked position by means of movable members on both sides of the first rail.

[0005] Another objective of this utility model is to provide a locking device and its slide rail assembly, wherein the locking device uses a movable member to switch the locking member to the unlocked position, so that the movable member and the locking member are not stuck on the second rail and move backward with the first rail, thereby improving the efficiency of free displacement.

[0006] Another objective of this utility model is to provide a locking device and its slide rail assembly, wherein the locking device sets the entry point by the longitudinal displacement of the moving part, and the entry point calculates how much displacement the first rail needs to make, thereby quantifying the improvement of the stroke distance.

[0007] Another objective of this utility model is to provide a locking device and its slide rail assembly, wherein the locking device can replace the base to compensate for the insufficient length of the first rail, or the locking device can replace the movable part to compensate for the relative position of the locking part and the locking base, thereby improving the efficiency of maintenance and reducing costs.

[0008] To achieve the above objectives, the present invention employs a locking device comprising: a base; a movable member movably connected to the base; and a locking member disposed on the movable member. When the movable member moves longitudinally between a first longitudinal position and a second longitudinal position on the base, the locking member is fixed in a locked position at the first longitudinal position, or the locking member is fixed in an unlocked position at the second longitudinal position.

[0009] Based on the aforementioned features, the seat has a fixing portion and a positioning portion formed on the side of the fixing portion, or the seat has a fixing portion and a positioning portion bent into the fixing portion; the movable member has an actuating portion and a rotating portion formed on the side of the actuating portion, or the movable member has an actuating portion and a rotating portion bent into the actuating portion; and the rotating portion, relative to the positioning portion, when the movable member is adjusted to the first longitudinal position of the seat, moves to one side of the positioning portion, so that the locking member is fixed in the locked position; or when the movable member is adjusted to the second longitudinal position of the seat, moves to the other side of the positioning portion, so that the locking member is fixed in the unlocked position.

[0010] Based on the aforementioned features, the self-thickness of the positioning part forms a positioning feature and the rotating part has a rotating feature, the positioning feature being relative to the rotating feature, and the rotating feature being displaced according to the positioning feature.

[0011] Based on the aforementioned features, there is a longitudinal adjustment angle between the first longitudinal position and the second longitudinal position. When the longitudinal adjustment angle is less than 90 degrees, the movable member generates a first inertial force, causing the locking member to move to the locked position. Or when the longitudinal adjustment angle is greater than 90 degrees, the movable member generates a second inertial force, causing the locking member to move to the unlocked position.

[0012] To achieve the above objectives, the present invention employs a slide rail assembly comprising: a base; a movable member movably connected to the base; and a locking member disposed on the movable member. When the movable member moves longitudinally between a first longitudinal position and a second longitudinal position on the base, the locking member is positioned in a locked position at the first longitudinal position, or in an unlocked position at the second longitudinal position; and a first rail having a first side surface and a second side surface, with the base disposed on the first rail. When the locking member is in the locked position, it is located on the side of the first side surface, or when the locking member is in the unlocked position, it is located on the side of the second side surface.

[0013] Based on the aforementioned features, it may further include a second rail having a first end face, and the first rail being movable relative to the second rail. When the movable member is in front of the first end face, the movable member performs a longitudinal adjustment between the first longitudinal position and the second longitudinal position in front of the first end face.

[0014] Based on the aforementioned features, it may further include a second rail having a first end face and a second end face, and the first rail being movable relative to the second rail. When the movable member is in the second longitudinal position, the first rail is movable toward the first end face or the second end face.

[0015] Based on the aforementioned features, it may further include a lock seat disposed on the second rail. When the movable member is adjusted to the first longitudinal position in front of the first end face, the lock member faces the lock seat, or the movable member is adjusted to the second longitudinal position in front of the first end face, the lock member does not face the lock seat.

[0016] To achieve the above objectives, this utility model employs a slide rail assembly: a first rail, which is equipped with a locking device, comprising a base, a movable member, and a locking member, wherein the movable member is movably connected to the base and the locking member is disposed on the movable member; and a second rail, which is equipped with a locking seat, wherein the first rail is movable relative to the second rail, and the second rail has a first end face and a second end face. When the movable member is in front of the first end face, the movable member is longitudinally adjusted between a first longitudinal position and a second longitudinal position in front of the first end face. When the movable member is adjusted to the first longitudinal position on the base, the locking member is fixed in a locked position with the movable member facing the locking seat. Alternatively, when the movable member is adjusted to the second longitudinal position on the base, the locking member is fixed in an unlocked position with the movable member facing the locking seat, thereby causing the first rail to move toward the second end face.

[0017] By employing the aforementioned technical means, the locking device achieves longitudinal displacement of the movable component, effectively switching the lock to the locked or unlocked position. Furthermore, the locking device is integrated into the first rail, allowing the movable component to switch the lock to the locked or unlocked position on both sides of the first rail. Switching the lock to the unlocked position with the movable component prevents the movable component and the lock from getting stuck on the second rail, allowing them to move backward along the first rail, thus enhancing the degree of freedom of displacement. The locking device uses the longitudinal displacement of the movable component to set the entry point, which calculates the required displacement distance of the first rail, quantifying the travel distance. Additionally, the locking device allows for replacement of the base to compensate for insufficient first rail length, or replacement of the movable component to compensate for the relative position of the lock and the lock base, facilitating maintenance and reducing costs. These effects complement each other. Attached Figure Description

[0018] Figure 1 This is an exploded perspective view of the slide rail assembly of this utility model.

[0019] Figure 2 This is a three-dimensional view of the slide rail assembly of this utility model.

[0020] Figure 3 This is an exploded perspective view of the locking device of this utility model.

[0021] Figure 4 This is a perspective view of the locking device of this utility model.

[0022] Figure 5 This is a schematic diagram of the locking device of this utility model in the closed state.

[0023] Figure 6 This is a schematic diagram of the lock device of this utility model in the open state.

[0024] Figure 7 This is a schematic diagram of the movable component of this utility model adjusted to the first longitudinal position on the seat.

[0025] Figure 8 This is a schematic diagram of the movable component of this utility model adjusted to the second longitudinal position on the seat.

[0026] Figure 9 This is a schematic diagram of the locking device of this utility model locked onto the lock seat.

[0027] Figure 10 This is another schematic diagram of the locking device of this utility model locked onto the lock seat.

[0028] Figure 11 This is a schematic diagram of the locking device of this utility model disposed on the lock seat.

[0029] Figure 12This is another schematic diagram of the locking device of this utility model disposed on the lock seat.

[0030] Figure 13 This is a schematic diagram showing the lock device of this utility model separated from the lock base.

[0031] Figure 14 This is another schematic diagram showing the lock device of this utility model separated from the lock base.

[0032] Figure 15 This is a schematic diagram of the locking device of this utility model retracting along the first rail.

[0033] Figure 16 This is another schematic diagram of the locking device of this utility model as it moves backward along the first rail.

[0034] Figure 17 This is a schematic diagram illustrating the compensation for the length of the first track and its relative position to the lock seat in the locking device of this utility model.

[0035] Figure 18 This is a flowchart of the operation method of the slide rail assembly of this utility model.

[0036] Figure 19 This is a schematic diagram illustrating the locking device of this utility model, which allows for quantifiable distance-based entry.

[0037] Figure 20 This is a schematic diagram showing the precise alignment of the lock device of this utility model with the lock seat.

[0038] In the figure, the reference numerals include:

[0039] 10-lock device

[0040] 11 seats

[0041] 111 Fixing part

[0042] 112 Positioning Department

[0043] 113 slots

[0044] 12 active pieces

[0045] 121 Action Section

[0046] 122 Rotating Part

[0047] 123 pivot connector

[0048] 13 Locks

[0049] 131 lock

[0050] 132 Locking Section

[0051] 133 Neck Lock

[0052] 20 slide rail assembly

[0053] 21 Track 1

[0054] 211 First side view

[0055] 212 Second side view

[0056] 213convex hull

[0057] 214 end face

[0058] 22 Track 2

[0059] 221 First end face

[0060] 222 Second end face

[0061] 223 Midframe

[0062] 224 outer frame

[0063] 23 lock base

[0064] 231 keyhole

[0065] 30 fasteners

[0066] A. Location Features

[0067] B Rotational Features

[0068] D1 First longitudinal position

[0069] D2 Second Vertical Position

[0070] F1 First Inertial Force

[0071] F2 Second Inertial Force

[0072] H1 First Hole

[0073] H2 second hole

[0074] H3 third hole

[0075] H4 fourth hole

[0076] K1 Lock Position

[0077] K2 Unlocked Position

[0078] L travel distance

[0079] L1 First Compensation Distance

[0080] L2 Second Compensation Distance

[0081] P entry point

[0082] Steps S1, S2, S3, and S4

[0083] T self-material thickness

[0084] θ Vertical adjustment angle

[0085] θ1 First angle

[0086] θ2 second angle Detailed Implementation

[0087] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0088] Example

[0089] Please refer to the following first. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the present invention is a locking device 10, comprising: a base 11. In this embodiment, the base 11 has a fixing part 111 and a positioning part 112 formed on the side of the fixing part 111. The forming method can be bending, so that the positioning part 112 extends out of the bending part, thus the base 11 forms an L-shape. The fixing part 111 is provided with at least one first hole H1, the positioning part 112 is provided with a second hole H2, and a groove 113 is provided between the fixing part 111 and the positioning part 112, but it is not limited to this.

[0090] A movable component 12 is movably connected to the base 11. In this embodiment, the movable component 12 has an actuating part 121 and a rotating part 122 formed on the side of the actuating part 121. The forming method can be bending, so that the rotating part 122 extends from the bend. The actuating part 121 is provided with a third hole H3 and a fourth hole H4. The third hole H3 corresponds to the second hole H2. A pivot member 123 passes through the third hole H3 to the second hole H2 to form a rotating axis for rotation and swinging. Regarding the rotating part 122 relative to the positioning part 112, the self-material thickness T of the positioning part 112 forms a positioning feature A, and the rotating part 122 has a rotating feature B. The positioning feature A is relative to the rotating feature B, and the rotating feature B is displaced according to the positioning feature A. The positioning feature A can be a self-plane, and the rotating feature B can be an extended plane. Therefore, the self-plane is used for positioning by the extended plane. In this way, the movable member 12 can be called a rotating member, and the movable connection can be a pivot connection, but it is not limited to this. In addition, the movable member 12 can also be a displacement member, and the movable connection can be a snap-fit. Therefore, the movable member 12 can be both a rotating member and a displacement member, which are within the same range.

[0091] A locking member 13 is disposed on the movable member 12. When the movable member 12 is longitudinally displaced between a first longitudinal position D1 and a second longitudinal position D2 on the base 11, the locking member 13 is fixed in a locked position K1 at the first longitudinal position D1, or the locking member 13 is fixed in an unlocked position K2 at the second longitudinal position D2. In this embodiment, the locking member 13 has a lock head 131, a lock part 132, and a lock neck 133, the lock neck 133 being located between the lock head 131 and the base 12. Between the locking parts 132, and the locking neck 133 corresponding to the fourth hole H4, it is further explained that when the movable part 12 is adjusted to the first longitudinal position D1 on the base 11, the rotating part 122 moves to one side of the positioning part 112, so that the locking part 13 is fixed in the locked position K1, or when the movable part 12 is adjusted to the second longitudinal position D2 on the base 11, the rotating part 122 moves to the other side of the positioning part 112, so that the locking part 13 is fixed in the unlocked position K2, and the rotating part 122 can also be engaged in the groove 113 for positioning, but is not limited thereto.

[0092] like Figure 7 , Figure 8 As shown, there is a longitudinal adjustment angle θ between the first longitudinal position D1 and the second longitudinal position D2. The longitudinal adjustment angle θ has a first angle θ1 and a second angle θ2. When the longitudinal adjustment angle θ is less than 90 degrees, the movable member 12 generates a first inertial force F1, which causes the locking member 13 to move to the locked position K1. Further, the first angle is 0 to 90 degrees. Or when the longitudinal adjustment angle is greater than 90 degrees, the movable member 12 generates a second inertial force F2, which causes the locking member 13 to move to the unlocked position K2. Further, the second angle θ2 is 90 to 180 degrees, but is not limited to this.

[0093] Please refer to the following: Figure 1 , Figure 2 The locking device 10 is integrated into a slide rail to form a slide rail assembly 20, which includes: a first rail 21 which may be an inner frame, the first rail 21 having a first side 211 and a second side 212, and the seat 11 disposed on the first rail 21. In this embodiment, the first rail 21 has at least one protrusion 213, the protrusion 213 engaging with the first hole H1, so that the locking device 10 is engaged with the first rail 21, and the second side 212 engaging with a server chassis, but not limited thereto. Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, when the locking member 13 is fixed in the locking position K1, the locking member 13 is located on the side of the first side surface 211, or Figure 13 , Figure 14 , Figure 15 , Figure 16 As shown, when the locking member 13 is in the unlocked position K2, the locking member 13 is located on the side of the second side 212.

[0094] Continuing from the above, it may further include a second rail 22, which has a first end face 221 and a second end face 222, and the first rail 21 is movable relative to the second rail 22. The second rail 22 includes a middle frame 223 and an outer frame 224, such as... Figure 11 , Figure 12 , Figure 13 , Figure 14 As shown, when the movable part 12 is in front of the first end face 221, the movable part 12 performs a longitudinal adjustment between the first longitudinal position D1 and the second longitudinal position D2 in front of the first end face 221, or as... Figure 15 , Figure 16 As shown, when the movable part 12 is at the second longitudinal position D2, the first rail 21 moves toward the first end face 221 or the second end face 222. In other words, the movable part 12 and the locking part 13 are not stuck on the second rail 22 and move backward with the first rail 21, so that the server chassis can also move backward smoothly. To further explain, when the locking device 10 is in the open state, the locking device 10 and the inner frame can move backward into the middle frame.

[0095] Continuing from the above, a lock seat 23 may be included as a bracket. The lock seat 23 is disposed on the second rail 22. When the movable member 12 is adjusted to the first longitudinal position D1 in front of the first end face 221, the locking member 13 faces the lock seat 23. Or, when the movable member 12 is adjusted to the second longitudinal position D2 in front of the first end face 221, the locking member 13 does not face the lock seat 23. In this embodiment, the lock seat 23 has a lock hole 231 with an internal thread, and the locking part 132 has an external thread, so that the locking part 132 can engage with the lock hole 231. Further, the locking device 10 can be locked onto the lock seat 23 when it is in the closed state, but this is not a limitation.

[0096] like Figure 17 As shown, the first rail 21 has an end face 214. A first compensation distance L1 is set between the end face 214 and the positioning part 112. If the first rail 21 is too short, the fixing part 111 can be lengthened to increase the first compensation distance L1. In this way, the seat 11 can be replaced without replacing the first rail 21. When a second compensation distance L2 is set between the actuating part 121 and the locking member 13, if the locking member 13 deviates from the lock seat 23, the deviation distance can be calculated to reduce the second compensation distance L2. In this way, the moving part 12 can be replaced without replacing the lock seat 23 or the locking device 10.

[0097] like Figure 18 As shown, an operating method for a slide rail assembly includes: Step S1: providing a first rail, the first rail having a locking device, the locking device including a base, a movable member, and a locking member, wherein the movable member is movably connected to the base and the locking member is disposed on the movable member; Step S2: providing a second rail, the second rail having a locking seat, and the first rail being movable relative to the second rail; Step S3: the second rail having a first end face and a second end face, wherein when the movable member is in front of the first end face, the movable member is in the first end face. The front of the end face is longitudinally adjusted between a first longitudinal position and a second longitudinal position; and step S4: when the movable member is adjusted to the first longitudinal position in the seat, the locking member is fixed in a locked position with the movable member in the first longitudinal position, and the locking member faces the lock seat; or when the movable member is adjusted to the second longitudinal position in the seat, the locking member is fixed in an unlocked position with the movable member in the second longitudinal position, and the locking member does not face the lock seat, so that the first rail moves toward the second end face.

[0098] like Figure 19 , Figure 20 As shown, a fixing member 30 is provided on the lock base 23. The fixing member 30 can mount the slide rail assembly 20 on a column. The locking device 10 sets the entry point P by the longitudinal displacement of the movable member 12. When the locking device 10 moves towards the fixing member 30 along with the first rail 21 to the entry point P, the entry point P calculates how much displacement the first rail 21 needs to make, and can also quantify a travel distance L, so that the movable member 12 can smoothly move longitudinally and cut into the front of the fixing member 30, so that the locking member 13 can smoothly face the lock base 23 and lock, or the movable member 12 can smoothly move longitudinally and cut into the front of a location other than the fixing member 30, so that the movable member 12 and the locking member 13 are not stuck on the second rail 22, the lock base 23 and the column, and can move backward with the first rail 21, so that the server chassis can also move backward smoothly.

Claims

1. A locking device, characterized in that, Include: A single body (11); A movable component (12), said movable component (12) being movably connected to the base (11); and A locking member (13) is provided on the movable member (12). When the movable member (12) is longitudinally displaced between a first longitudinal position (D1) and a second longitudinal position (D2) on the seat (11), the locking member (13) is fixed in a locked position (K1) as the movable member (12) is in the first longitudinal position (D1), or the locking member (13) is fixed in an unlocked position (K2) as the movable member (12) is in the second longitudinal position (D2).

2. The locking device according to claim 1, characterized in that, The seat (11) has a fixed part (111) and a positioning part (112) formed on the side of the fixed part (111). The movable part (12) has an actuating part (121) and a rotating part (122) formed on the side of the actuating part (121). The rotating part (122) is relative to the positioning part (112). When the movable part (12) is adjusted to the first longitudinal position (D1) of the seat (11), the rotating part (122) moves to one side of the positioning part (112) to fix the locking member (13) in the locked position (K1). Or when the movable part (12) is adjusted to the second longitudinal position (D2) of the seat (11), the rotating part (122) moves to the other side of the positioning part (112) to fix the locking member (13) in the unlocked position (K2).

3. The locking device according to claim 2, characterized in that, The self-material thickness (T) of the positioning part (112) forms a positioning feature (A) and the rotating part (122) has a rotating feature (B), the positioning feature (A) is relative to the rotating feature (B), and the rotating feature (B) is displaced according to the positioning feature (A).

4. The locking device according to claim 1, characterized in that, There is a longitudinal adjustment angle (θ) between the first longitudinal position (D1) and the second longitudinal position (D2). When the longitudinal adjustment angle (θ) is less than 90 degrees, the movable part (12) generates a first inertial force (F1) and causes the locking part (13) to move towards the locked position (K1). Or when the longitudinal adjustment angle (θ) is greater than 90 degrees, the movable part (12) generates a second inertial force (F2) and causes the locking part (13) to move towards the unlocked position (K2).

5. A slide rail assembly, characterized in that, Include: A locking device (10) includes: a base (11); a movable member (12) movably connected to the base (11); a locking member (13) disposed on the movable member (12), wherein when the movable member (12) is longitudinally displaced between a first longitudinal position (D1) and a second longitudinal position (D2) on the base (11), the locking member (13) is fixed in a locked position (K1) as the movable member (12) is in the first longitudinal position (D1), or the locking member (13) is fixed in an unlocked position (K2) as the movable member (12) is in the second longitudinal position (D2); and A first rail (21) has a first side (211) and a second side (212), and the seat (11) is disposed on the first rail (21). When the locking member (13) is in the locked position (K1), the locking member (13) is located on the side of the first side (211), or when the locking member (13) is in the unlocked position (K2), the locking member (13) is located on the side of the second side (212).

6. The slide rail assembly according to claim 5, characterized in that, It further includes a second rail (22), the second rail (22) having a first end face (221), and the first rail (21) being movable relative to the second rail (22). When the movable member (12) is in front of the first end face (221), the movable member (12) is longitudinally adjusted between the first longitudinal position (D1) and the second longitudinal position (D2) in front of the first end face (221).

7. The slide rail assembly according to claim 5, characterized in that, It further includes a second rail (22), the second rail (22) having a first end face (221) and a second end face (222), and the first rail (21) is movable relative to the second rail (22). When the movable member (12) is in the second longitudinal position (D2), the first rail (21) is movable toward the first end face (221) or the second end face (222).

8. The slide rail assembly according to claim 6, characterized in that, It also includes a lock seat (23) which is disposed on the second rail (22). When the movable member (12) is adjusted to the first longitudinal position (D1) in front of the first end face (221), the lock member (13) faces the lock seat (23), or the movable member (12) is adjusted to the second longitudinal position (D2) in front of the first end face (221), the lock member (13) does not face the lock seat (23).

9. The slide rail assembly according to claim 5, characterized in that, The seat (11) has a fixed part (111) and a positioning part (112) formed on the side of the fixed part (111). The movable part (12) has an actuating part (121) and a rotating part (122) formed on the side of the actuating part (121). The rotating part (122) is relative to the positioning part (112). When the movable part (12) is adjusted to the first longitudinal position (D1) of the seat (11), the rotating part (122) moves to one side of the positioning part (112) to fix the locking member (13) in the locked position (K1). Or when the movable part (12) is adjusted to the second longitudinal position (D2) of the seat (11), the rotating part (122) moves to the other side of the positioning part (112) to fix the locking member (13) in the unlocked position (K2).

10. A slide rail assembly, characterized in that, Include: A first rail (21) is provided with a locking device (10), the locking device (10) comprising a base (11), a movable member (12) and a locking member (13), wherein the movable member (12) is movably connected to the base (11) and the locking member (13) is disposed on the movable member (12); and A second rail (22) is provided with a locking seat (23), and the first rail (21) is movable relative to the second rail (22). The second rail (22) has a first end face (221) and a second end face (222). When the movable member (12) is in front of the first end face (221), the movable member (12) is longitudinally adjusted between a first longitudinal position (D1) and a second longitudinal position (D2) in front of the first end face (221), and the movable member (12) is adjusted to the first longitudinal position on the seat (11). (D1) The locking member (13) is fixed in a locked position (K1) with the movable member (12) in the first longitudinal position (D1), and the locking member (13) faces the lock seat (23), or the movable member (12) is adjusted to the second longitudinal position (D2) on the seat (11), and the locking member (13) is fixed in an unlocked position (K2) with the movable member (12) in the second longitudinal position (D2), and the locking member (13) is not facing the lock seat (23), so that the first rail (21) moves toward the second end face (222).