CN114126312A

CN114126312A - Sliding rail assembly

Info

Publication number: CN114126312A
Application number: CN202010905018.1A
Authority: CN
Inventors: 陈庚金; 杨顺和; 黄建立; 王俊强
Original assignee: King Slide Works Co Ltd; King Slide Technology Co Ltd
Current assignee: King Slide Works Co Ltd; King Slide Technology Co Ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2022-03-01

Abstract

The invention relates to a slide rail assembly, which comprises a first rail, a bracket, a second rail and a locking device. The bracket is arranged on the first rail and provided with a locking part; the second rail can move relative to the first rail; the lock device is arranged on the second rail. The lock device includes a lock seat and a lock member. The lock seat is operable to be in one of an open state and a closed state relative to the second rail. When the second rail is located at a predetermined position relative to the first rail, the lock seat is operably in the closed state, so that the lock element can be locked into the lock part of the bracket.

Description

Sliding rail assembly

Technical Field

The present invention relates to a sliding rail, and more particularly, to a sliding rail assembly with a lock device.

Background

For example, U.S. patent publication No. US 6,644,481B2 discloses a device for rack-mount cabinets, which discloses a mounting bracket and a sliding bracket. The mounting frame is attached to a frame through at least one connector; and the sliding bracket can position the case in the rack through a flange. As can be seen from fig. 1 of the patent, the flange is immovable relative to the sliding bracket and is used to connect to the mounting frame or the frame.

However, with the market demands, how to develop a different slide rail product with a bracket becomes an issue worth discussing.

Disclosure of Invention

The invention relates to a sliding rail assembly with a lock device.

According to one aspect of the present invention, a slide rail assembly includes a first rail, a front bracket, a second rail, and a locking device. The front bracket is arranged on the first rail and comprises a fastener and a locking part arranged on the fastener; the second rail can move from a folding position to an extending position relative to the first rail; the lock device is arranged on the second rail and comprises a lock seat and a lock piece, wherein the lock seat is operationally in one of an opening state and a closing state relative to the second rail, and when the lock seat is in the closing state, the lock piece corresponds to the lock part of the front bracket; when the lock seat is in the opening state, the lock piece is far away from the lock part of the front bracket; when the second rail is located at the folding position relative to the first rail, the lock seat is operably in the closing state, and the lock seat has a characteristic capable of abutting against a front end part of the second rail or shortening a gap between the lock seat and the front end part of the second rail; when the second rail is located at the folding position relative to the first rail and the lock seat is in the closed state, the lock piece can be locked into the lock part of the front bracket.

Preferably, the front bracket includes a side plate and an end plate substantially perpendicularly connected to the side plate, two mounting members are disposed on the end plate, and the locking portion is located between the two mounting members.

Preferably, the lock device is disposed adjacent to a front end portion of the second rail.

Preferably, the locking part is a threaded hole, the locking part includes an operating part and a threaded part connected to the operating part, and the threaded part and the locking part are screw connection structures matched with each other.

Preferably, a fixing base is connected to the inner side of the end portion adjacent to the second rail, the fixing base is located beyond the end plate of the front bracket, the fixing base has a hole, and the lock base has a connecting section penetrating through the hole of the fixing base so that the lock base is connected to the fixing base.

Preferably, the fixing base has a thickness, the connecting section of the lock base defines a connecting space with a boundary, and the width in the connecting space is greater than the thickness, so that the lock base can be adjusted in position transversely relative to the fixing base.

Preferably, the lock seat has a bent section adjacent to the end plate of the front bracket.

Preferably, when the lock seat is in the closed state and the lock member is locked into the lock portion of the front bracket, the lock seat and the second rail are substantially located on the same longitudinal plane.

Preferably, the fastener is movably mounted on the front bracket, when the fastener is in a locking position, a fastening portion of the fastener is adjacent to the front of the end plate of the front bracket, and the locking portion is disposed on the fastening portion of the fastener.

According to another aspect of the present invention, a slide rail assembly adapted to be mounted to a frame, the frame including at least a pair of posts, each post having a corresponding slide rail assembly mounted thereto, the slide rail assembly including a first rail, a front bracket, a second rail, and a locking device. The front bracket is arranged on the first rail and comprises a fastener for locking the stand and a locking part arranged on the fastener, and the locking part is positioned in front of the stand; the second rail can carry a bearing object and can move to the outside of the frame from a folding position relative to the first rail; the lock device is arranged on the second rail and comprises a lock seat and a lock piece, wherein the lock seat is operationally in one of an opening state and a closing state relative to the second rail, and when the lock seat is in the closing state, the lock piece corresponds to the lock part of the front bracket; when the lock seat is in the opening state, the lock piece is far away from the lock part of the front bracket; when the second rail is located at the folding position relative to the first rail, the lock seat is operably in the closing state, and the lock seat has a characteristic capable of abutting against a front end part of the second rail or shortening a gap between the lock seat and the front end part of the second rail; when the second rail is located at the folding position relative to the first rail and the lock seat is in the closed state, the lock piece can be locked into the lock part of the front bracket.

According to another aspect of the present invention, a slide rail assembly includes a first rail, a bracket, a second rail and a locking device. The bracket is arranged on the first rail and comprises a fastener, and a locking part is arranged on the fastener; the second rail can move relative to the first rail; the lock device is arranged on the second rail and comprises a lock seat and a locking piece, wherein the lock seat is operationally in one of an opening state and a closing state relative to the second rail, and the locking piece is arranged on the lock seat; when the second rail is located at a preset position relative to the first rail, the lock seat is operatively in the closed state, and in the closed state, the lock seat has a feature capable of abutting against a portion of the second rail or shortening a gap between the lock seat and the portion of the second rail, and the lock piece can be locked into the lock portion of the bracket.

Drawings

For further explanation of the above objects, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of a slide rail assembly according to an embodiment of the invention.

Fig. 2 shows an exploded view of a slide rail assembly according to an embodiment of the invention including a first rail and a second rail.

Fig. 3 is a partial schematic view illustrating a lock base of the slide rail assembly in an open state relative to the second rail according to the embodiment of the invention.

Fig. 4 is a partial schematic view illustrating the lock seat of the slide rail assembly according to the embodiment of the invention being closed from the open state to a predetermined direction relative to the second rail.

Fig. 5 is a partial schematic view illustrating the lock seat of the slide rail assembly in a closed state relative to the second rail according to the embodiment of the invention.

Fig. 6 is a schematic view illustrating the slide rail assembly of the embodiment of the invention applied to a rack, and the second rail is located at a retracted position relative to the first rail.

Fig. 7 is a schematic view showing that the slide rail assembly according to the embodiment of the present invention is applied to the rack, the second rail is located at the retracted position relative to the first rail, and the lock seat is not locked to the rack.

Fig. 8 is a schematic view showing that the slide rail assembly according to the embodiment of the present invention is applied to the rack, the second rail is located at the retracted position relative to the first rail, and the lock base is locked to the rack.

Fig. 9 is a schematic view illustrating the slide rail assembly of the embodiment of the invention applied to the rack, and the second rail is located at an extended position relative to the first rail.

Fig. 10 is a partial schematic view of the lock base of the slide rail assembly of the embodiment of the invention at a first transverse position relative to the second rail.

Fig. 11 is a partial schematic view of the lock base of the slide rail assembly of the embodiment of the invention at a second transverse position relative to the second rail.

Fig. 12 is an external view of a front bracket according to another embodiment of the present invention, in which a locking portion is disposed on a fastening member.

Fig. 13 is an external view of a lock device disposed on the second rail according to another embodiment of the present invention, wherein the lock seat is in an open state and the lock element is away from (not corresponding to) the lock portion.

Fig. 14 is a schematic top view of the arrangement of fig. 13.

Fig. 15 is an external view of a lock device disposed on a second rail according to another embodiment of the present invention, wherein the lock seat is in a closed state and the lock element corresponds to the lock portion (not yet locked).

Fig. 16 is a schematic top view of the arrangement of fig. 15.

Fig. 17 shows the lock of fig. 15 in a locked position relative to the lock.

Detailed Description

As shown in fig. 1 and 2, a slide rail assembly 20 according to an embodiment of the present invention includes a first rail 22, a bracket, a second rail 26, and a locking device 28. The bracket is, for example, a front bracket 24, but is not limited in implementation. Preferably, another bracket is included, such as a rear bracket 30.

The first rail 22 has a first end and a second end far from the first end, such as a front end and a rear end. The first rail 22 includes a plurality of walls that collectively define a channel 32 for the second rail 26 to be movably mounted. A first wall 34a, a second wall 34b and a longitudinal wall 36 are disposed at a predetermined portion of the first rail 22 and connected between the first wall 34a and the second wall 34 b. The first wall 34a, the second wall 34b and the longitudinal wall 36 together define the channel 32.

The front bracket 24 is disposed on the first rail 22, and the front bracket 24 has a locking portion 38. Preferably, the front bracket 24 is disposed adjacent to the front end of the first rail 22. On the other hand, the rear bracket 30 is disposed adjacent to the rear end portion of the first rail 22. Preferably, one of the front bracket 24 and the rear bracket 30 is longitudinally adjustable in position relative to the first rail 22. Preferably, the front bracket 24 includes a side plate 44 and an end plate 46 adjacent to the side plate 44, for example, the end plate 46 is substantially perpendicular to the side plate 44, wherein two mounting members 48 are disposed on the end plate 46, and the lock portion 38 is located between the two mounting members 48.

The second rail 26 is longitudinally displaceable relative to the first rail 22. The second rail 26 has a first end and a second end away from the first end, such as a front end 26a and a rear end 26 b. It should be noted that in this embodiment, the X-axis direction is the longitudinal direction (or the length direction or the displacement direction of the slide rail), the Y-axis direction is the transverse direction (or the lateral direction of the slide rail), and the Z-axis direction is the vertical direction (or the height direction of the slide rail).

The lock device 28 is disposed adjacent to the second rail 26, and the lock device 28 includes a lock seat 40 and a lock element 42.

Preferably, the lock device 28 is disposed at the front end 26a of the second rail 26.

Preferably, a fixed base 50 is connected to the inner side of the front end 26a adjacent to the second rail 26, and when the second rail 26 is in a retracted position, the fixed base 50 is positioned beyond the end plate 46 of the front bracket 24 (as shown in fig. 1); the fixed base 50 has a hole H (it can also be considered that the second rail 26 has the hole H), and the lock base 40 has a connecting section 52 passing through the hole H of the fixed base 50, so that the lock base 40 is connected (e.g., movably connected) to the fixed base 50. On the other hand, the locking member 42 is disposed on the locking seat 40.

As shown in fig. 3-5, the lock seat 40 is operatively disposed in one of an open state K1 (shown in fig. 3) and a closed state K2 (shown in fig. 5) relative to the second rail 26. Here, the lock seat 40 can rotate from the open state K1 to the closed state K2 relative to the second rail 26; alternatively, the lock seat 40 can rotate relative to the second rail 26 from the closed state K2 to the open state K1.

When the lock holder 40 is in the open state K1, the lock 42 is away from (or misaligned with) the lock 38 of the front bracket 24 (as shown in fig. 3); when the lock holder 40 is in the closed state K2, the lock 42 corresponds to (or aligns with) the lock portion 38 of the front bracket 24 (as shown in fig. 5).

Preferably, the locking portion 38 is a threaded hole, the locking member 42 includes an operating portion 54 and a threaded portion 56 connected to the operating portion 54, and the threaded portion 56 and the locking portion 38 are matched with each other.

Further, when the second rail 26 is located at a predetermined position, such as the retracted position P1, relative to the first rail 22, the lock seat 40 can be operated from the open state K1 (shown in fig. 3) to rotate in a predetermined direction R (shown in fig. 4) to the closed state K2, such that the lock 42 can be locked into the lock portion 38 of the front bracket 24 by the threaded portion 56, and the second rail 26 cannot be displaced from the retracted position P1 (shown in fig. 5) relative to the first rail 22. That is, when the locking member 42 is locked into the locking portion 38 of the front bracket 24, the second rail 26 is fixed at the retracted position P1. It should be noted that when the lock seat 40 is in the closed state K2 and the locking element 42 is corresponding to (or aligned with) the lock portion 38 of the front bracket 24, a user can apply a force to the operation portion 54 by hand or a tool (e.g., a screwdriver), so that the locking element 42 is rotated to lock the threaded portion 56 into the lock portion 38 of the front bracket 24 (as shown in fig. 5).

Preferably, the lock base 40 has a bent portion 58, and the bent portion 58 of the lock base 40 is adjacent to the side 60 of the end plate 46 of the front bracket 24 (as shown in fig. 5) when the lock base 40 is in the closed state K2.

Preferably, the slide rail assembly 20 further includes a fastener 62 movably mounted to the front bracket 24 (as shown in fig. 3). For example, the fastener 62 is pivotally connected to the front bracket 24 by a shaft 64, so that the fastener 62 can move between a locked position C (shown in fig. 3) or an unlocked position (not shown). Wherein, when the fastening member 62 is at the locking position C, a fastening portion 65 of the fastening member 62 is adjacent to the front of the end plate 46 of the front bracket 24. Preferably, the fastener 62 can be maintained at the locking position C by the elastic force of an elastic portion, and the fastener 62 is within the technical scope that can be understood by those skilled in the art, and therefore, for the sake of brevity, will not be described herein again.

As shown in fig. 6 and 7, two slide rail assemblies 20 are mounted to a frame. Specifically, the rack includes at least one pair of columns, such as a pair of front columns 66a and a pair of rear columns 66b, each front column 66a and each rear column 66b is mounted with a corresponding slide assembly 20, wherein the first rail 22 of the slide assembly 20 is mounted to the front column 66a and the rear column 66b through the front bracket 24 and the rear bracket 30, respectively, and the second rail 26 can carry a carrying object 68, such as an electronic device. The second rail 26 is in the retracted position P1 relative to the first rail 22. The principle of the front bracket 24 being mounted to the front column 66a and the principle of the rear bracket 30 being mounted to the rear column 66b are substantially the same, for example, the front column 66a includes a plurality of mounting holes (e.g., a first mounting hole 70a, a second mounting hole 70b and a third mounting hole 70C are located between the first mounting hole 70a and the second mounting hole 70 b), the front bracket 24 is mountable to the first mounting hole 70a and the second mounting hole 70b of the front column 66a by the two mounting members 48, and the fastener 62 is in the locking position C and can lock the front of the front column 66a by the fastening part 65 (as shown in fig. 7). The lock seat 40 is operatively in the open state K1 relative to the second rail 26, and at this time, the second rail 26 is displaceable relative to the first rail 22 from the retracted position P1 to a first direction D1.

As shown in fig. 8, when the second rail 26 is at the retracted position P1 relative to the first rail 22, the lock seat 40 is operatively in the closed state K2, so that the threaded portion 56 of the locking member 42 can be locked into the lock portion 38 of the front bracket 24, and the carrying object 68 is held in the rack and cannot be arbitrarily moved out of the rack. Further, once the lock seat 40 is operatively in the closed state K2 relative to the second rail 26, such that the threaded portion 56 of the locking element 42 is locked into the lock portion 38 of the front bracket 24, the second rail 26 is not displaceable relative to the first rail 22 from the retracted position P1 in the first direction D1. That is, the carrier 68 is fixed at the retracted position P1.

As shown in fig. 9, once the lock seat 40 is no longer in the closed state K2 (e.g., in the open state K1) relative to the second rail 26, the second rail 26 can be displaced from the retracted position P1 to the first direction D1 relative to the first rail 22 to an extended position P2 and outside the rack. It should be noted that the second rail 26 is movable relative to the first rail 22 from the extended position P2 to a second direction D2 opposite to the first direction D1 to the retracted position P1 to be retracted into the housing.

As shown in fig. 10 and 11, the fastener 62 is omitted, wherein the fixing base 50 has a thickness T (as shown in fig. 10), and the connecting section 52 of the lock seat 40 defines a connecting space S having a boundary, and the width of the connecting space S is greater than the thickness T, so that the lock seat 40 can be laterally adjusted relative to the fixing base 50 of the second rail 26. For example, the lock base 40 can be adjusted and displaced from a first lateral position Y1 (shown in fig. 10) to a second lateral position Y2 (shown in fig. 11).

Preferably, when the lock seat 40 is located at the second transverse position Y2 and in the closed state K2, such that the lock member 42 is locked into the lock portion 38 of the front bracket 24 (as shown in fig. 11), one side of the lock seat 40 and one side of the second rail 26 are substantially located on the same longitudinal plane L. This is advantageous, for example, when the second rail 26 is in the retracted position P1 relative to the first rail 22, so as to ensure that the lock seat 40 does not block the front of the carrier 68, for example, the lock seat 40 does not block the electrical connectors, cables, warning lights or related signs of the carrier 68, and thus, the maintenance of the carrier 68 or the slide rails by field personnel is facilitated. Alternatively, the second transverse position Y2 is located by the lock seat 40 to facilitate the alignment or locking of the lock 42 to the lock portion 38 of the front bracket 24. Preferably, the bent portion 58 of the lock seat 40 can be correspondingly abutted against the front surface of the column (e.g., the front column 66a) (as shown in fig. 11), so as to improve the fastening effect of the front bracket 24 to the column.

Fig. 12 to 14 show an arrangement of another embodiment of the present invention, which is substantially the same as the previous embodiment, mainly different in that the locking part 202 of the front bracket 200 is disposed on the buckling part of the buckling member 204, the locking device 206 is disposed on the second rail 208, and the lock seat 210 is in the open state K1, and the locking element 212 is far away from (not corresponding to) the locking part 202. On the other hand, the locking part 202 is shown in front of the end plate 201 or the column 214 when the front bracket 200 is mounted on the column 214. In contrast to the previous embodiments, for example, when the front bracket 24 shown in fig. 7 is mounted on the front pillar 66a, the lock portion 38 is located at a position behind the front pillar 66a, and therefore, the lock 42 of the previous embodiments is located slightly farther from the position of the lock portion 38. In the present embodiment, the position of the screw portion of the locking member 212 with respect to the lock portion 202 can be shortened by moving the lock portion 202 forward to be located in front of the end plate 201 or the column 214.

If the locking element 212 of the locking device 206 is to be locked, the locking seat 210 may be manually displaced, for example, by pushing the locking seat 210 with an external force F (as shown in fig. 14), so that the locking seat 210 is laterally displaced from the open state K1 to the closed state K2, and the threaded portion of the locking element 212 corresponds to the locking portion 202 (as shown in fig. 15 and 16), so as to lock the locking element 212 to the locking portion 202 (as shown in fig. 17). Preferably, the connecting section 211 of the lock base 210 passes through the hole H '(as shown in fig. 15) of the second rail 208, and the lock base 210 is provided with a feature 216 (e.g., a bent portion), when the locking element 212 is locked to or corresponds to (not locked to) the position where the locking element 202 is fixed, the feature 216 of the lock base 210 abuts against the front end 208a of the second rail 208, and the connecting section 211 of the lock base 210 abuts against the inner wall of the hole H' of the second rail 208, thereby forming a front-back blocking relationship; alternatively, even though the lock holder 210 and the second rail 208 are not abutted, the gap between the lock holder 210 and the front end 208a of the second rail 208 can be shortened by the feature 216, so that when the second rail 208 is extended and displaced relative to the front bracket 200, the problem that the lock holder 210 is displaced forward and backward relative to the second rail 208 due to the gap (or longitudinal gap) between the lock holder 210 and the second rail 208 is not caused.

From the above description, it can be seen that the enhanced efficacy and advantages of the present invention are:

a. when the second rail 26 is at the retracted position P1 relative to the first rail 22, the lock seat 40 is in the closed state K2, so that the lock 42 can be locked in the lock 38 of the front bracket 24, and the second rail 26 cannot move from the retracted position P1 to the extended position P2 relative to the first rail 22. With this arrangement, when the slide assembly 20 is applied to a rack, the second rail 26 cannot be displaced from the retracted position P1 to the extended position P2 relative to the first rail 22, so that the carrier 68 can be kept in the rack and cannot be displaced out of the rack arbitrarily.

b. The lock bracket 40 is laterally adjustable relative to the second rail 26.

c. The lock 202 of the front bracket 200 is provided at the fastening portion of the fastener, so that the lock 202 is positioned in front of the end plate 201 or the column 214, and the position of the screw portion of the lock 212 with respect to the lock 202 can be shortened.

Although the present invention has been described with reference to the present specific embodiments, it will be recognized by those skilled in the art that the above embodiments are illustrative only, and various equivalent changes and modifications may be made without departing from the spirit of the present invention, and therefore, it is intended to cover in the appended claims all such changes and modifications as fall within the true spirit of the invention.

Claims

1. A slide rail assembly comprises a first rail, a front bracket, a second rail and a locking device, wherein the second rail can move from a retracted position to an extended position relative to the first rail, and is characterized in that:

the front bracket is arranged on the first rail and comprises a fastener and a locking part arranged on the fastener; and

the lock device is arranged on the second rail and comprises a lock seat and a lock piece, wherein the lock seat is operationally in one of an opening state and a closing state relative to the second rail, and when the lock seat is in the closing state, the lock piece corresponds to the lock part of the front bracket; when the lock seat is in the opening state, the lock piece is far away from the lock part of the front bracket;

when the second rail is located at the folding position relative to the first rail, the lock seat is operably in the closing state, and the lock seat has a characteristic capable of abutting against a front end part of the second rail or shortening a gap between the lock seat and the front end part of the second rail;

when the second rail is located at the folding position relative to the first rail and the lock seat is in the closed state, the lock piece can be locked into the lock part of the front bracket.

2. The slide rail assembly of claim 1 wherein the front bracket includes a side plate and an end plate substantially perpendicular to the side plate, two mounting members are disposed on the end plate, and the locking portion is disposed between the two mounting members.

3. The slide rail assembly of claim 2 wherein the lock device is disposed adjacent the front end of the second rail.

4. The slide rail assembly of claim 3 wherein the locking portion is a threaded hole, the locking member includes an operating portion and a threaded portion connected to the operating portion, the threaded portion and the locking portion are configured to mate with each other.

5. The slide rail assembly of claim 2 wherein a mounting base is attached adjacent an inner side of the end of the second rail, the mounting base being positioned beyond the end plate of the front bracket, the mounting base having an aperture, the lock housing having an attachment section extending through the aperture of the mounting base such that the lock housing is attached to the mounting base.

6. The slide assembly of claim 5 wherein the mounting base has a thickness, the connecting portion of the lock housing defines a connecting space bounded by a width greater than the thickness, such that the lock housing is laterally adjustable relative to the mounting base.

7. The slide rail assembly of claim 5 wherein the lock bracket has a bent section adjacent the end plate of the front bracket.

8. The slide rail assembly of claim 1 wherein the lock seat and the second rail are substantially in the same longitudinal plane when the lock seat is in the closed position and the lock element is locked into the lock portion of the front bracket.

9. The slide rail assembly of claim 2 wherein the fastener is movably mounted to the front bracket, a fastening portion of the fastener is adjacent to a front portion of the end plate of the front bracket when the fastener is in a locked position, and the locking portion is disposed on the fastening portion of the fastener.

10. The utility model provides a slide rail assembly suitable for install in a frame, this frame contains at least a pair of stand, and a corresponding slide rail assembly is installed to each stand, and this slide rail assembly contains a first rail, a preceding bracket, a second rail and a locking device, its characterized in that:

the front bracket is arranged on the first rail and comprises a fastener for locking the stand and a locking part arranged on the fastener, and the locking part is positioned in front of the stand;

the second rail can carry a bearing object and can move to the outside of the frame from a folding position relative to the first rail; and

11. The slide rail assembly of claim 10 wherein the front bracket includes a side plate and an end plate substantially perpendicular to the side plate, two mounting members are disposed on the end plate, and the locking portion is disposed between the two mounting members.

12. The slide rail assembly of claim 11 wherein the lock device is disposed adjacent the front end of the second rail.

13. The slide rail assembly of claim 12 wherein the locking portion is a threaded hole, the locking member includes an operating portion and a threaded portion connected to the operating portion, the threaded portion and the locking portion are configured to mate with each other.

14. The slide rail assembly of claim 11 wherein a mounting base is attached adjacent an inner side of the end of the second rail, the mounting base being positioned beyond the end plate of the front bracket, the mounting base having an aperture, the lock housing having an attachment section extending through the aperture of the mounting base such that the lock housing is attached to the mounting base.

15. The slide assembly of claim 14 wherein the mounting base has a thickness, the connecting portion of the lock housing defining a connecting space bounded by a width greater than the thickness, the lock housing being laterally adjustable relative to the mounting base.

16. The slide rail assembly of claim 14 wherein the lock housing has a bent section for engaging the housing.

17. The slide rail assembly of claim 11 wherein the lock seat and the second rail are substantially in the same longitudinal plane when the lock seat is in the closed position and the lock element is locked into the lock portion of the front bracket.

18. A slide rail assembly comprises a first rail, a bracket, a second rail and a locking device, wherein the second rail can move relative to the first rail, and the slide rail assembly is characterized in that:

the bracket is arranged on the first rail and comprises a fastener, and a locking part is arranged on the fastener; and

the lock device is arranged on the second rail and comprises a lock seat and a locking piece, wherein the lock seat is operationally in one of an opening state and a closing state relative to the second rail, and the locking piece is arranged on the lock seat;

when the second rail is located at a preset position relative to the first rail, the lock seat is operatively in the closed state, and in the closed state, the lock seat has a feature capable of abutting against a portion of the second rail or shortening a gap between the lock seat and the portion of the second rail, and the lock piece can be locked into the lock portion of the bracket.

19. The slide rail assembly of claim 18 wherein the bracket includes a side plate and an end plate adjacent the side plate, two mounts are disposed on the end plate, and the lock portion is disposed between the two mounts.

20. The slide assembly of claim 19 wherein the locking device is disposed adjacent to an end of the second rail, the locking portion is a threaded hole, and the locking member includes a threaded portion that is threadedly engaged with the locking portion.