TWI577267B - Slide rail assembly - Google Patents

Description

Slide rail assembly

The present invention relates to a slide rail assembly, and more particularly to a rail assembly and a bracket mount that are movable relative to a bracket to increase the travel of the rail member.

A slide rail assembly conventionally used for a server chassis is disclosed in US Pat. No. 7,281,694 B2, the rack having a pair of machine columns on the left and right sides, taking a pair of machine columns as an example, the pair of machine posts are based on The racks of different depths have a predetermined distance. a slide rail assembly is mounted between the pair of pillars, the rail assembly includes a first rail, a second rail, a third rail, a front bracket, and a rear bracket, wherein the first rail a rail has a front end and a rear end, the second rail is movably connected to the first rail, the third rail is movably connected to the second rail, and the front bracket is fixed to the front end of the first rail, and the rear bracket is fixed Connected to the back end of the first rail. The rail assembly is mounted to one of the pair of posts by the front bracket and the rear bracket, respectively. The foregoing is incorporated herein by reference.

The above-mentioned slide rail assembly can be applied to a conventional server chassis, but today's servers are moving toward high density, and some server chassis different from the traditional chassis, such as the T-type chassis, are beginning to appear on the market, so Designing a slide assembly that increases the travel of the rails to accommodate the specific servo chassis has become an important issue on the market.

The present invention is directed to a slide rail assembly in which the rail members and bracket seats are movable relative to the bracket.

According to the present invention, a slide rail assembly includes a first rail, a second rail, a bracket base, and a first bracket. The first rail defines a passage; the second rail is movably coupled to the first rail and is longitudinally movable relative to the first rail between a collapsed position and an extended position within the passage of the first rail; a bracket seat coupled to the first rail; the first bracket movably coupled to the bracket seat; wherein, when the second rail is displaced relative to the first rail from the retracted position toward the extended position The second rail drives the first rail such that the bracket is driven by the first rail and is movable from a first position to a second position relative to the first bracket.

Preferably, the first rail has a front portion and a rear portion, and the bracket seat is coupled to the front portion adjacent to the first rail. The slide rail assembly further includes a second bracket movably connected adjacent to each other. The rear of the first rail.

Preferably, the bracket base further comprises a through hole, the first bracket further comprises an opening and a latching member, the latching member has an elastic arm and a latching portion laterally connecting the elastic arm and correspondingly Opening, when the bracket seat is in the second position relative to the first bracket, the latching portion of the latching member extends from the opening of the first bracket to the bracket seat by the elastic force of the elastic arm Perforating to latch the bracket seat; and the second rail further has an untwisting member, wherein the second rail is movable relative to the first rail from the extended position to the retracting position The unloading member of the second rail pushes the latching portion of the latching member in an untwisting direction, and the blocking portion of the bracket seat can release the latching portion of the latching member from the punching hole, so that the The second rail drives the first rail such that the bracket is driven by the first rail and is movably displaced from the second position to the first position relative to the first bracket.

Preferably, the bracket base further includes a blocking portion, the first bracket further includes an abutting portion, the blocking portion of the bracket seat when the bracket seat is in the first position relative to the first bracket Blocked by the abutment of the first bracket.

Preferably, the first bracket comprises a side wall and an end plate connected substantially perpendicularly to the side wall, the slide rail assembly further comprising at least one mounting member and a pin member connected to the end plate, the pin member is coupled There is a movable one-piece connector.

Preferably, the bracket base further comprises an upper wall, a lower wall, and a side wall extending between the upper wall and the lower wall, the upper wall, the lower wall and the side wall jointly defining a passage. The first bracket includes a side wall, the side wall of the first bracket being movable within the passage of the bracket seat.

Preferably, the bracket base further includes a latching hole, the first bracket further includes a convex portion corresponding to the latching hole, when the bracket seat is in the second position relative to the first bracket, The convex portion of the first bracket projects into the latching hole of the bracket seat.

According to another aspect of the present invention, a slide rail assembly is adapted to mount a chassis to a frame, the frame including a first chassis and a second chassis, the slide assembly including a first rail a second rail, a third rail, a bracket base, a first bracket, and a second bracket. The first rail has a front portion, a rear portion, and a defined passage; the second rail is movably coupled to the first rail and longitudinally between a retracted position and an extended position within the passage of the first rail Relative to the first rail active displacement; the third rail is movably connected to the second rail, the third rail is mounted to the chassis; the bracket is connected adjacent to the front of the first rail; the first bracket is active Connecting the bracket to the first chassis; the second bracket is movably connected to a rear portion adjacent to the first rail, and the second bracket is mounted to the second chassis Wherein, when the third rail is pulled out relative to the first rail, the third rail drives the second rail to move the second rail from the retracting position to the extended position relative to the first rail The directional displacement, in the process, the second rail drives the first rail, so that the bracket is driven by the first rail and is movably displaced from a first position to a second position relative to the first bracket.

Preferably, the chassis includes a first portion having a width greater than a width of the second portion and a second portion mounted on a side of the second portion of the chassis.

According to another aspect of the present invention, a slide rail assembly is adapted to mount a chassis to a frame, the frame including a first chassis and a second chassis, the slide assembly including a first rail a second rail, a third rail, a bracket base, a first bracket, and a second bracket. The first rail has a front portion and a rear portion; the second rail is longitudinally movably connected to the first rail; the third rail is longitudinally movably connected to the second rail, the third rail is mounted to the chassis; Connected to a front portion adjacent to the first rail; the first bracket is movably coupled to the bracket seat, the first bracket is mounted to the first chassis; the second bracket is movably coupled adjacent thereto a second bracket is mounted to the second column; wherein the second rail drives the second rail to move in an extending direction, so that the second rail drives the first rail The carriage seat is movably displaced from a first position relative to the first bracket to a second position.

Preferably, the chassis includes a first portion having a width greater than a width of the second portion and a second portion mounted on a side of the second portion of the chassis.

Preferably, the bracket base further comprises an upper wall, a lower wall, and a side wall extending between the upper wall and the lower wall, the upper wall, the lower wall and the side wall jointly defining a passage. The first bracket includes a side wall and an end plate that is substantially perpendicularly connected to the side wall, and the side wall of the first bracket is movable in the passage of the bracket seat.

One of the features of the embodiments of the present invention is that the rail member of the slide rail assembly and the bracket base can be displaced relative to the bracket.

20‧‧‧Slide rail assembly

22‧‧‧First track

24‧‧‧second track

26,200‧‧‧ bracket seat

28,204‧‧‧First bracket

30‧‧‧second bracket

32‧‧‧ third track

34a, 38a‧‧‧ front

34b, 38b‧‧‧ rear

36,40‧‧‧ channel

42‧‧‧Resolve mail

44a, 80a‧‧‧ wall

44b, 80b‧‧‧low wall

46,58,82‧‧‧ Side wall

48,84‧‧‧ channel

50‧‧‧Perforation

52‧‧ ‧ blocking

54‧‧‧ gap

56‧‧‧Retaining wall

60‧‧‧End board

62‧‧‧Parts

64‧‧‧ openings

66‧‧‧ Cards

68‧‧‧ Pins

70‧‧‧ elastic arm

71‧‧‧Card section

72‧‧‧Card Department

73‧‧‧Bevel

74‧‧‧Cards

76‧‧‧Card

78‧‧‧Release Department

67,86‧‧‧Installation

88‧‧‧Chassis

90‧‧‧Rack

92a‧‧‧first column

92b‧‧‧Second column

94‧‧‧Part 1

96‧‧‧Part II

98‧‧‧ side

202‧‧‧ 卡掣孔

206‧‧‧ convex

D1‧‧‧ extending direction

D2‧‧‧ folding direction

D3‧‧‧Resolving directions

P1‧‧‧ first position

P2‧‧‧ second position

W1, W2‧‧‧ width

1 is a perspective view showing a slide rail assembly according to an embodiment of the present invention; FIG. 2 is an exploded perspective view showing a slide rail assembly according to an embodiment of the present invention; and FIG. 3 is a view showing a slide rail assembly according to an embodiment of the present invention. FIG. 4A shows a schematic diagram of a slide rail assembly according to an embodiment of the present invention for mounting a chassis in a rack, and the bracket base is first with respect to the first bracket. FIG. 4B is a schematic view showing the displacement of the second rail and the third rail of the slide rail assembly of FIG. 4A with respect to the first rail; FIG. 4C shows the second rail and the third rail of the slide rail assembly of FIG. 4B. A schematic diagram of further displacement of a rail and a second position of the bracket relative to the first bracket; FIG. 5A shows that the rail assembly of the embodiment of the present invention is mounted on the first pillar, and the bracket seat is opposite to the first bracket FIG. 5B is a schematic view showing the rail member of the slide rail assembly of FIG. 5A being pulled out in the extending direction; FIG. 6A is a view showing the rail assembly of the embodiment of the present invention installed on the first column, and A schematic view of the carriage seat in a second position relative to the first bracket; FIG. 6B shows FIG. 6A The bracket seat is in the second position relative to the first bracket, and the latching portion of the latching member can extend into the through hole of the bracket seat to latch the bracket seat; FIG. 7A shows the sliding of an embodiment of the present invention. The bracket of the rail assembly is in a first position relative to the first bracket, and the latch portion of the latch member can extend into the opening of the first bracket; FIG. 7B shows the bracket assembly of FIG. 7A FIG. 7C is a schematic view showing the bracket seat of the slide rail assembly of FIG. 7A in a second position relative to the first bracket, and the latching portion of the latch member can be extended to FIG. 8A is a schematic view showing the sliding rail assembly of the embodiment of the present invention for pushing the latching portion of the latching member in a disengaging direction by means of the second rail; FIG. 8B is a view of FIG. 8A; The shutter portion of the bracket assembly of the slide rail assembly is capable of unscrewing the latching portion of the latching member from the through hole of the bracket seat; and FIG. 8C shows that the bracket seat of FIG. 8B is in the first position relative to the first bracket. Schematic diagram 9A is a schematic view showing a slide rail assembly mounted on a first machine column according to another embodiment of the present invention, and the bracket base is in a position relative to the first bracket; and FIG. 9B is a view showing the bracket seat of FIG. 9A opposite to the first support. The frame is in another position, and the convex portion of the first bracket projects into the latching hole of the bracket seat.

A more detailed understanding of the structure, features, functions and objects of the present invention is provided. The embodiments of the present invention are described in detail below with reference to the drawings.

1 shows a slide rail assembly 20 including a first rail 22, a second rail 24, a bracket base 26, and a first bracket 28. Here, a second bracket 30 and a third rail 32 are further included. The first rail 22, the second rail 24, and the third rail 32 are sequentially and movably connected in a longitudinal direction and can be in an extended state.

As shown in FIGS. 1 and 2, the first rail 22 has a front portion 34a, a rear portion 34b, and a channel 36 defined.

The second rail 24 is movably coupled to the first rail 22 and is located within the passage 36 of the first rail 22. The second rail 24 has a front portion 38a, a rear portion 38b, and a channel 40 defined. In this embodiment, the second rail 24 further has an untwisting member 42. The untwisting member 42 may be located adjacent to the front portion 38a of the second rail 24, but is not limited thereto.

The bracket base 26 is coupled to the first rail 22. For example, the bracket seat 26 can be fixedly connected to the front portion 34a adjacent to the first rail 22 by means of riveting, screwing, welding, or snapping; or the bracket seat 26 can be formed in the first A track 22 can be considered as part of the first track 22 and is not limited in its implementation. The bracket seat 26 further includes an upper wall 44a, a lower wall 44b, and a side wall 46 extending between the upper wall 44a and the lower wall 44b, the upper wall 44a, the lower wall 44b, and the side wall 46. A channel 48 is defined in common. Here, the bracket seat 26 further includes a through hole 50 and a blocking portion 52 located at the phase Adjacent to the perforation 50, a notch 54, and at least one retaining wall 56 are adjacent to the notch 54. The through hole 50 , the blocking portion 52 , the notch 54 , and the at least one retaining wall 56 are located on the side wall 46 of the bracket seat 26 , but are not limited thereto.

The first bracket 28 is movably coupled to the bracket base 26. The first bracket 28 includes a side wall 58 and an end plate 60 that is substantially perpendicularly coupled to the side wall 58 and is movable within the passage 48 of the bracket seat 26. The first bracket 28 also includes abutting portion 62, an opening 64, a latching member 66, at least one mounting member 67, and a pin member 68. Specifically, the abutting portion 62 and the opening 64 are located on the side wall 58. The latch member 66 is resiliently coupled to the side wall 58 and can be considered a portion of the first bracket 28. The latch member 66 has a resilient arm 70 and a latch portion 72 that laterally connects the resilient arm 70 to the opening 64. The latching portion 72 includes at least one latching section 71 adjacent to the inclined surface 73 of the at least one latching section 71. The at least one mounting member 67 and the pin member 68 are coupled to the end plate 60. The pin member 68 is coupled with a movable latching member 74. The latching member 74 includes a latching portion 76 and a release portion 78. The release portion 78 can be used to operate the latching portion 76 to enable the latching portion 76 to retract into the interior of the pin member 68.

The second bracket 30 is movably coupled adjacent the rear portion 34b of the first rail 22. The second bracket 30 includes an upper wall 80a, a lower wall 80b, and a side wall 82. The upper wall 80a, the lower wall 80b, and the side wall 82 collectively define a passage 84. The second bracket 30 is movably mounted to the rear portion 34b of the first rail 22 by means of a passage 84 such that the second bracket 30 and the first rail 22 are longitudinally movable relative to each other. The second bracket 30 has at least one mounting member 86.

The third rail 32 is movably coupled to the second rail 24 and is located within the passage 40 of the second rail 24.

FIG. 3 shows that a chassis 88 can be mounted to a frame 90 by means of a pair of rail assemblies 20. The frame 90 includes two pairs of columns, such as two corresponding first columns 92a, and two corresponding second columns 92b. Two portions (e.g., front and rear portions) of each of the slide rail assemblies 20 can be mounted to the first post 92a of the frame 90 by the first bracket 28 and the second bracket 30, respectively. The second post 92b enables the chassis 88 to be mounted to the frame 90. Specifically, the chassis 88 is a third rail 32 mounted to the rail assembly 20. In this embodiment, the chassis 88 is generally a T-shaped chassis. For example, the chassis 88 includes a first portion 94 and a second portion 96. The first portion 94 has a width W1 and the second portion 96 has a width W2. Wherein the width W1 is greater than the width W2.

As shown in FIG. 4A, the chassis 88 is mounted to the frame by means of the rail assembly 20, and the rail assembly 20 is in a collapsed state. Specifically, the two portions of the slide rail assembly 20 can be mounted on the first post 92a and the first portion via the mounting member 67 of the first bracket 28 and the mounting member 86 of the second bracket 30, respectively. Two column 92b. The bracket seat 26 is at a first position P1 with respect to the first bracket 28.

As shown in FIG. 4B, when the second rail 24 and the third rail 32 are pulled out from the folding position toward the extending direction D1, the second rail 24 is opposite to the third rail 32. The first rail 22 is displaced and gradually extended and expanded. Wherein, since the width W1 of the first portion 94 of the chassis 88 is greater than the width W2 of the second portion 96, the first portion 94 additionally has a thickness T compared to the second portion 96. Thus, the third rail 32 of the sled assembly 20 can only be mounted to one side 98 of the second portion 96 of the chassis 88.

As shown in FIG. 4C, when the second rail 24 and the third rail 32 are further pulled out from the first rail 22 in the extending direction D1, the third rail 32 further drives the second rail 24 to When the second rail 24 is further moved to a predetermined position in the extending direction, the first rail 22 is driven, and the bracket seat 26 is driven by the first rail 22 to be opposite the first bracket 28 from the first position P1. live The first rail 22 is displaced to a second position P2, that is, the first rail 22 is displaced relative to the first bracket 28 by the bracket seat 26 in the extending direction D1 to a position. Accordingly, the length of the stroke in which the chassis 88 is pulled out from the frame 90 can be increased, and in the process of being pulled out in the extending direction D1, the first rail 22 is supported by the bracket seat 26 to have The actual operational requirements of the particular form of the chassis 88 (e.g., a T-chassis) mounted on the frame 90.

As shown in FIG. 5A, the slide rail assembly 20 can be mounted on the first post 92a by means of a first bracket 28, wherein the latch portion 76 protrudes to the outside of the pin member 68, the latch portion 76. It can correspond to and block the wall surface of the first column 92a. The second rail 24 and the third rail 32 are in a folded position relative to the first rail 22. The bracket seat 26 is at the first position P1 with respect to the first bracket 28. When the bracket seat 26 is in the first position P1, the blocking portion 52 of the bracket seat 26 can be blocked by the abutting portion 62 of the first bracket 28.

As shown in FIG. 5B, the second rail 24 and the third rail 32 can be pulled out from the folding position in the extending direction with respect to the first rail 22 to gradually expand and expand.

As shown in FIG. 6A, the second rail 24 is further moved to a predetermined position in the extending direction to drive the first rail 22, so that the bracket seat 26 is displaced along the first rail 22 to be in the second position P2.

As shown in FIG. 6B, when the bracket seat 26 is in the second position P2, the second rail 24 and the third rail 32 can be folded relative to the first rail 22. Wherein, when the bracket seat 26 is in the second position P2, the latching portion 72 of the latching member 66 extends from the first bracket 28 into the through hole 50 of the bracket seat 26 to latch the bracket Block 26. Moreover, when the bracket seat 26 is in the second position P2 relative to the first bracket 28, the notch 54 corresponds to the release portion 78 and the at least one retaining wall 56 can be used to block the release portion 78. It is worth mentioning that when the bracket seat 26 is in the second position P2, the second The rail 24 and the third rail 32 can be further folded in the folding direction, so that the second rail 24 drives the first rail 22 and drives the bracket seat 26 accordingly, so that the bracket seat 26 can be driven from the second Position P2 returns to the first position P1 (as shown in FIG. 5A)

As further shown in FIG. 7A, the latch portion 72 of the latch member 66 is correspondingly and extends into the opening 64 of the first bracket 28. Wherein, when the bracket seat 26 is at the first position P1 relative to the first bracket 28, the blocking portion 52 of the bracket seat 26 can abut against the abutting portion 62 of the first bracket 28.

As shown in FIG. 7B, during the movement of the second rail 24 and the third rail 32 relative to the extension direction D1 of the first rail 22 from the folding position to the extending position, the second rail 24 reaches a predetermined position. The first rail 22 can be driven to move the bracket 26 to the first bracket 28 from the first position P1 to the extending direction D1.

As shown in FIG. 7C, when the first rail 22 is further driven by the second rail 24 in the extending direction D1, the blocking portion 52 of the bracket seat 26 will pass over the latch portion 72, and the bracket The seat 26 is displaced relative to the first bracket 28 to the second position P2. When the bracket seat 26 is in the second position P2, the latching portion 72 of the latching member 66 extends from the opening 64 of the first bracket 28 to the bracket seat by the elastic force of the elastic arm 70. The perforation 50 of the 26, and the latching member 66 can be engaged with the blocking portion 52 by the latching portion 71 to chuck the bracket holder 26.

As shown in FIG. 8A to FIG. 8C, when the second rail 24 is displaced relative to the first rail 22 from the extended position to the retracting direction D2 of the retracting position, the solution of the second rail 24 is utilized. The jaw 42 can push the latching portion 72 of the latching member 66 in a disengaging direction D3 to disengage the latching portion 71 of the latching portion 72 from the blocking portion 52 of the bracket holder 26. The blocking portion 52 of the bracket seat 26 can be pushed against the inclined surface 73 of the latching portion 72 to disengage the latching portion 72 of the latching member 66 from the through hole 50 of the bracket seat 26 to the untwisting direction D3.掣, the second rail 24 drives the first rail 22 to the folding direction D2 Moving, the first rail 22 drives the carriage seat 26 from the second position P2 to be moved to the first position P1.

9A and 9B show an embodiment of a slide rail assembly according to another embodiment of the present invention. Specifically, the difference between this embodiment and the foregoing embodiment is that the bracket base 200 includes a latching hole 202, and the first bracket 204 includes a convex portion 206 corresponding to the latching hole 202. . When the bracket base 200 is in the second position P2 relative to the first bracket 204, the convex portion 206 of the first bracket 204 protrudes into the latching hole 202 of the bracket base 200 to latch the bracket seat. 200.

While the present invention has been disclosed in the foregoing preferred embodiments, it is not intended to limit the invention, and the scope of the invention is defined by the scope of the appended claims.

20‧‧‧Slide rail assembly

22‧‧‧First track

24‧‧‧second track

26‧‧‧ bracket seat

28‧‧‧First bracket

30‧‧‧second bracket

32‧‧‧ third track

34a‧‧‧ front

34b‧‧‧The back

Claims (11)

A slide rail assembly comprising: a first rail defining a passage; a second rail movably connecting the first rail and longitudinally between a collapsed position and an extended position in the passage of the first rail a displacement relative to the first rail; a bracket seat coupled to the first rail; and a first bracket movably connecting the bracket seat; wherein, when the second rail is opposite the first rail During the movable displacement of the collapsed position in the direction of the extended position, the second rail drives the first rail such that the bracket is driven by the first rail and is displaced from a first position relative to the first bracket And a second position; wherein the bracket base further comprises a through hole, and a blocking portion is adjacent to the through hole, the first bracket further comprises an opening and a latching member, the latching member has a resilient arm And a latching portion laterally connecting the elastic arm and correspondingly opening, when the bracket seat is in the second position relative to the first bracket, the latching portion of the latching member is biased by the elastic force of the elastic arm The opening of the first bracket projects into the perforation of the bracket seat to latch the bracket seat; The second rail further has an untwisting member. When the second rail is displaced relative to the first rail from the extended position to the retracting position, the unloading member of the second rail will be jammed. The latching portion of the member is pushed in an untwisting direction, and the blocking portion of the bracket seat can disengage the latching portion of the latching member from the through hole, so that the second rail drives the first rail, so that The carriage seat is driven by the first rail and is movably displaced from the second position to the first position relative to the first bracket. The slide rail assembly of claim 1, wherein the first rail has a front portion and a rear portion, the tray The cradle is coupled to a front portion adjacent the first rail, and the rail assembly further includes a second bracket movably coupled to a rear portion adjacent the first rail. The slide rail assembly of claim 1, wherein the first bracket further comprises an abutting portion, the blocking portion of the bracket seat when the bracket seat is in the first position relative to the first bracket Blocked by the abutment of the first bracket. The slide rail assembly of claim 1, wherein the first bracket comprises a side wall and an end plate is substantially perpendicularly connected to the side wall, and the slide rail assembly further comprises at least one mounting member and a pin member Attached to the end plate, the pin member incorporates a movable snap member. The slide rail assembly of claim 1, wherein the bracket base further comprises an upper wall, a lower wall, and a side wall extending between the upper wall and the lower wall, the upper wall and the lower wall And the side wall collectively defines a passage, the first bracket includes a side wall, and the side wall of the first bracket is movable in the passage of the bracket seat. The slide rail assembly of claim 1, wherein the bracket base further comprises a latching hole, the first bracket further comprising a convex portion corresponding to the latching hole, when the bracket seat is opposite to the first When the bracket is in the second position, the convex portion of the first bracket protrudes into the latching hole of the bracket seat. A slide rail assembly for mounting a chassis to a rack, the rack comprising a first chassis and a second chassis, the slide assembly comprising: a first rail having a front portion a rear portion, and defining a passage; a second rail movably connecting the first rail and being longitudinally movable relative to the first rail between a collapsed position and an extended position in the passage of the first rail; a third rail, movably connecting the second rail, the third rail mounting the chassis; a bracket seat connected to the front portion adjacent to the first rail; a first bracket movably connecting the bracket seat, the first bracket being mounted to the first chassis; and a second bracket movably coupled to a rear portion adjacent to the first rail, the second bracket Mounting the bracket to the second bobbin; wherein, when the third rail is pulled out relative to the first rail, the third rail drives the second rail so that the second rail is opposite to the first rail The folding position is movably displaced in the direction of the extended position. In the process, the second rail drives the first rail, so that the bracket seat is driven by the first rail and is opposite to the first bracket from the first The positional movement is displaced to a second position; wherein the bracket base further comprises a through hole, and a blocking portion is located adjacent to the through hole, the first bracket further comprises an opening and a latching member, the latching member has An elastic arm and a latch portion laterally connect the elastic arm and open, and when the bracket is in the second position relative to the first bracket, the latch portion of the latch member is supported by the elastic arm The elastic force extends from the opening of the first bracket into the perforation of the bracket seat to latch the bracket seat; wherein the second rail Having an untwisting member, in the process of moving the second rail relative to the first rail from the extended position to the retracting position, the latching portion of the latching member is used by the untwisting member of the second rail Pushing in an untwisting direction, and the blocking portion of the bracket seat can disengage the latching portion of the latching member from the through hole, so that the second rail drives the first rail, so that the bracket seat is The first rail is driven and is movably displaced from the second position to the first position relative to the first bracket. The slide rail assembly of claim 7, wherein the chassis comprises a first portion and a second portion, the first portion having a width greater than a width of the second portion, the third rail being mounted in the second portion of the chassis One side of the part. A slide rail assembly for mounting a chassis to a rack, the rack including a first column and a second column, the slide rail assembly comprises: a first rail having a front portion and a rear portion; a second rail longitudinally movably connecting the first rail; and a third rail connected longitudinally to the rail a second rail, the third rail mounting the chassis; a bracket seat connected to the front portion adjacent to the first rail; a first bracket movably connecting the bracket seat, the first bracket being mounted to a first chassis; and a second bracket movably coupled to a rear portion adjacent the first rail, the second bracket being mounted to the second chassis; wherein the second rail is used to drive the second The movable displacement of the rail to an extending direction causes the second rail to drive the first rail to move the bracket seat from a first position relative to the first bracket to a second position; wherein the bracket seat is further The first bracket further includes an opening and a latching member, the latching member has an elastic arm and a latching portion laterally connecting the elastic arm and Should be open, when the bracket seat is in the second position relative to the first bracket, the latching portion of the latch member The elastic force of the arm extends from the opening of the first bracket into the through hole of the bracket seat to latch the bracket seat; wherein the second rail further has an untwisting member, when the second rail is opposite to the first rail During the movable displacement of the rail from the extended position to the retracting position, the latching portion of the latching member is pushed in a disengaging direction by the untwisting member of the second rail, and the bracket seat is The blocking portion can disengage the latching portion of the latching member from the through hole, and the second rail drives the first rail, so that the bracket seat is driven by the first rail and is opposite to the first bracket The second position is displaced to the first position. The slide rail assembly of claim 9, wherein the chassis comprises a first portion and a second portion, the first portion having a width greater than a width of the second portion, the third rail being mounted in the second portion of the chassis One side of the part. The slide rail assembly of claim 9, wherein the bracket base further comprises an upper wall, a lower wall, and a side wall extending between the upper wall and the lower wall, the upper wall and the lower wall And the side wall collectively defines a passage, the first bracket comprises a side wall and an end plate is substantially perpendicularly connected to the side wall, and the side wall of the first bracket is movable in the passage of the bracket seat.