Slide rail assembly

Abstract

The invention relates to a sliding rail assembly which comprises a first rail, a second rail and a sliding assisting device. The sliding assisting device is movably installed between the first rail and the second rail. One of the first rail and the sliding assisting device is provided with an elastic piece, and the elastic piece is provided with a first clamping characteristic; the other one of the first rail and the sliding assisting device is provided with a second clamping characteristic; through mutual clamping of the first clamping feature and the second clamping feature, the sliding assisting device is prevented from leaving a preset position. The second rail comprises at least one auxiliary part used for releasing the mutual clamping relation between the first clamping characteristic and the second clamping characteristic.

Description

Technical Field

[0001] The present invention relates to a slide rail mechanism, in particular to a slide rail assembly that can improve the reliability of a sliding assistance device between two slide rails to leave from a predetermined position. Background Art

[0002] For example, U.S. Patent Publication No. US 6,851,773 B2 discloses a positioning structure for a sliding assistance member of a drawer slide rail, which includes a first rail, a second rail, a sliding assistance member, a positioning member, and a de-latching member. The sliding assistance member is movably installed between the first rail and the second rail; the positioning member is disposed on the first rail; the de-latching member is disposed on the second rail. When the second rail is removed from the first rail and reinserted into the first rail, the second rail can push the hook portion of the positioning member by the inclined surface at the rear end of the de-latching member, so that the elastic hook rod of the positioning member can move elastically, and the hook portion on the elastic hook rod is disengaged from the locking relationship formed with the hook of the sliding assistance member.

[0003] However, in order to meet the diverse needs of the market, how to develop a different slide rail product has obviously become an issue that cannot be ignored. Summary of the Invention

[0004] The object of the present invention is to provide a slide rail assembly that can improve the reliability of a sliding assistance device between two slide rails to leave from a predetermined position.

[0005] According to one aspect of the present invention, a slide rail assembly includes a first rail, a second rail, and a sliding assistance device. The first rail includes a channel; the second rail can be longitudinally displaced relative to the first rail; the sliding assistance device is movably installed between the first rail and the second rail; wherein, one of the first rail and the sliding assistance device is provided with an elastic member, and the elastic member is configured with a first latching feature, and the other of the first rail and the sliding assistance device is configured with a second latching feature; through the mutual latching of the first latching feature and the second latching feature, it is used to prevent the sliding assistance device from displacing in a retracting direction from a predetermined position; wherein, the second rail includes an auxiliary portion and a driving portion; wherein, when the second rail is removed from the channel of the first rail and reinserted into the channel of the first rail in the retracting direction, the second rail contacts the elastic member through one of the auxiliary portion and the driving portion, so that the elastic member moves from a first state to a second state, then the first latching feature and the second latching feature are mutually disengaged, and at this time, through the displacement of the second rail in the retracting direction, the other of the auxiliary portion and the driving portion contacts a predetermined feature on the sliding assistance device, so as to drive the sliding assistance device to leave the predetermined position in the retracting direction.

[0006] According to another aspect of the present invention, a slide rail assembly includes a first rail, a second rail, and an assisting sliding device. The first rail includes a channel; the assisting sliding device is located within the channel of the first rail; wherein, one of the first rail and the assisting sliding device is arranged with an elastic member, and the elastic member is configured with a first latching feature, and the other of the first rail and the assisting sliding device is configured with a second latching feature; through the mutual latching of the first latching feature and the second latching feature, it is used to prevent the assisting sliding device from displacing in a closing direction from a first predetermined position; wherein, the second rail includes an auxiliary portion and a driving portion; wherein, when the second rail is inserted into the channel of the first rail from outside the channel of the first rail in the closing direction, the second rail contacts the elastic member through one of the auxiliary portion and the driving portion, causing the elastic member to move from a first state to a second state, then the first latching feature and the second latching feature are mutually unlatched. At this time, through the displacement of the second rail in the closing direction, the other of the auxiliary portion and the driving portion contacts a predetermined feature on the assisting sliding device to push the assisting sliding device to leave the first predetermined position in the closing direction; wherein, the slide rail assembly further includes a third rail, and the first rail is movably installed between the third rail and the second rail; wherein, the slide rail assembly further includes a workpiece arranged on the first rail and a predetermined structure arranged on the second rail; when the second rail displaces relative to the first rail from a closed position to an open direction, through the mutual latching of the workpiece and the predetermined structure, the second rail and the first rail can synchronously displace relative to the third rail in the open direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] To further illustrate and confirm 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, wherein:

[0008] Figure 1 A perspective view showing a slide rail assembly according to an embodiment of the present invention.

[0009] Figure 2 An exploded view showing a slide rail assembly according to an embodiment of the present invention including a first rail, a second rail, and a third rail.

[0010] Figure 3 A schematic view showing an assisting sliding device according to an embodiment of the present invention being latched at a first predetermined position relative to the first rail.

[0011] Figure 4 A schematic view showing the first rail according to an embodiment of the present invention being in an open position relative to the third rail, and the second rail being removed from a channel of the first rail.

[0012] Figure 5Schematic diagram showing that in an embodiment of the present invention, the first rail is in the open position relative to the third rail, and the second rail is inserted into the channel of the first rail in a retracting direction.

[0013] Figure 6 Schematic diagram showing another perspective that in an embodiment of the present invention, the first rail is in the open position relative to the third rail, and the second rail is inserted into the channel of the first rail in the retracting direction.

[0014] Figure 7 Schematic diagram showing that in an embodiment of the present invention, the slide rail assembly is in a retracted state.

[0015] Figure 8 Schematic diagram showing that in an embodiment of the present invention, the second rail and the first rail can be synchronously displaced relative to the third rail in an opening direction. Detailed implementation mode

[0016] As Figure 1 and Figure 2 shown, a slide rail assembly 20 in an embodiment of the present invention includes a first rail 22, a second rail 24, and a sliding assistance device 26. Preferably, it further includes a third rail 28. Among them, the first rail 22 (such as a middle rail) is movably installed between the third rail 28 (such as an outer rail) and the second rail 24 (such as an inner rail). The first rail 22, the second rail 24, and the third rail 28 can be longitudinally displaced relative to each other. Herein, 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).

[0017] The third rail 28 has a first end 28a and a second end 28b with opposite positions, for example, a front end and a rear end, but it is not limited in practice. The third rail 28 includes a first wall 30a, a second wall 30b, and a longitudinal wall 32 connected between the first wall 30a and the second wall 30b of the third rail 28. The first wall 30a, the second wall 30b, and the longitudinal wall 32 of the third rail 28 together define an auxiliary channel for accommodating the first rail 22, and a ball strip can be respectively installed inside the first wall 30a and the second wall 30b adjacent to the third rail 28 to assist in sliding and support the first rail 22.

[0018] The first rail 22 has a first end 22a and a second end 22b with opposite positions, for example, a front end and a rear end, but it is not limited in practice. The first rail 22 includes a first wall 34a, a second wall 34b, and a longitudinal wall 36 connected between the first wall 34a and the second wall 34b of the first rail 22. The first wall 34a, the second wall 34b, and the longitudinal wall 36 of the first rail 22 together define a channel 37 for accommodating the second rail 24.

[0019] The second rail 24 has a first end 24a and a second end 24b that are opposite in position, such as a front end and a rear end, but are not limited in practice. The second rail 24 includes a first wall 38a, a second wall 38b, and a longitudinal wall 40 connected between the first wall 38a and the second wall 38b of the second rail 24.

[0020] The sliding assistance device 26 is movably installed between the first rail 22 and the second rail 24. Specifically, the channel 37 of the first rail 22 can be used to accommodate the sliding assistance device 26 and the second rail 24. Preferably, the sliding assistance device 26 includes a plurality of rolling members 44, and these rolling members 44 are, for example, ball bearings, and are used to support between the first rail 22 and the second rail 24, which helps to smooth the relative displacement of the first rail 22 and the second rail 24 with respect to each other. The sliding assistance device 26 includes a first side portion 46a, a second side portion 46b, and a longitudinal portion 48 connected between the first side portion 46a and the second side portion 46b, and these rolling members 44 are arranged on both the first side portion 46a and the second side portion 46b.

[0021] As Figure 2 and Figure 3 shown, one of the first rail 22 and the sliding assistance device 26 is arranged with an elastic member 50. Here, taking the elastic member 50 being connected to the first rail 22 (longitudinal wall 36) as an example, and the elastic member 50 is configured with a first locking feature 52. Further, the elastic member 50 is also configured with a locking structure 33 adjacent to the first locking feature 52, and a predetermined space is defined between the first locking feature 52 and the locking structure 33. Wherein, a first guiding section 54 and a second guiding section 56 are respectively arranged at the places where the first locking feature 52 and the locking structure 33 are relatively far away from each other (as Figure 3 shown), and the first guiding section 54 and the second guiding section 56 are, for example, arc surfaces or inclined surfaces, but are not limited in practice.

[0022] Preferably, the elastic member 50 includes a connecting portion 58 and an elastic portion 60. The connecting portion 58 is connected (such as fixed) to the first rail 22 (longitudinal wall 36), and the elastic portion 60 extends from the connecting portion 58.

[0023] Preferably, the first locking feature 52 and the locking structure 33 are arranged on the elastic portion 60 of the elastic member 50. Taking the first locking feature 52 and the locking structure 33 both being protrusions as an example, but are not limited in practice.

[0024] The other one of the first rail 22 and the sliding assist device 26 is configured with a second locking feature 62. Here, taking the sliding assist device 26 as an example of being configured with the second locking feature 62. Through the mutual locking of the first locking feature 52 and the second locking feature 62, it is used to prevent the sliding assist device 26 from displacing relative to the first rail 22 from a first predetermined position K1 in a closing direction D1 (as Figure 3 shown).

[0025] Preferably, when the sliding assist device 26 is in the first predetermined position K1, the sliding assist device 26 is close to the first end 22a of the first rail 22.

[0026] Preferably, when the sliding assist device 26 is in the first predetermined position K1, the second locking feature 62 is locked between the first locking feature 52 and the locking structure 33. At this time, the sliding assist device 26 cannot displace relative to the first rail 22 from the first predetermined position K1 in the closing direction D1 or an opening direction D2 (as Figure 3 shown).

[0027] Preferably, the sliding assist device 26 further includes a first working space M1 and a second working space M2, and the second locking feature 62 is located between the first working space M1 and the second working space M2; when the sliding assist device 26 is in the first predetermined position K1, the positions of the first working space M1 and the second working space M2 respectively correspond to the first locking feature 52 and the locking structure 33.

[0028] Preferably, the sliding assist device 26 further includes a predetermined feature 67, and the predetermined feature 67 is, for example, a bent section or a protruding section, but is not limited in practice.

[0029] The second rail 24 includes an auxiliary portion 64 and a driving portion 66 (as Figure 2 shown), and there is a predetermined longitudinal distance between the auxiliary portion 64 and the driving portion 66. Among them, compared with the driving portion 66, the auxiliary portion 64 is closer to the first end 24a of the second rail 24. In other words, the driving portion 66 is farther from the first end 24a of the second rail 24.

[0030] Preferably, the auxiliary portion 64 is arranged with a first guiding feature 68a and a second guiding feature 68b that are opposite in position, and the first guiding feature 68a and the second guiding feature 68b are, for example, both arc surfaces or inclined surfaces, but are not limited in practice.

[0031] Preferably, both the auxiliary portion 64 and the driving portion 66 are protruding portions, but are not limited in practice.

[0032] As Figure 4As shown, the first rail 22 is in an open position J relative to the third rail 28. Preferably, the first rail 22 can be maintained in the open position J through a positioning mechanism. In addition, the second rail 24 can be removed from the channel 37 of the first rail 22 in the opening direction D2, so that the second rail 24 is located outside the channel 37 of the first rail 22. Since this part is a technical scope that can be understood by ordinary knowledgeable people familiar with the field, it is not further described here for the sake of simplicity.

[0033] Furthermore, when the second rail 24 is removed from the channel 37 of the first rail 22 in the opening direction D2, the sliding aid device 26 is displaced to the first predetermined position K1 in the opening direction D2 relative to the first rail 22, and the second latching feature 62 of the sliding aid device 26 is latched between the first latching feature 52 and the latching structure 33, wherein the mutual latching (or mutual blocking) of the first latching feature 52 and the second latching feature 62 can be used to prevent the sliding aid device 26 from being displaced from the first predetermined position K1 in the folding direction D1.

[0034] like Figure 4 and Figure 5 As shown, when the second rail 24 is removed from the channel 37 of the first rail 22 (as shown in FIG. Figure 4 As shown in FIG. 1 , the second rail 24 is reinserted into the channel 37 of the first rail 22 in the folding direction D1 (as shown in FIG. 1 ). Figure 5 As shown in FIG. 1 , the second rail 24 contacts (e.g. presses) the elastic member 50 (the latching structure 33) through the auxiliary portion 64 and one of the driving portions 66 (e.g. the auxiliary portion 64), so that the elastic member 50 (the elastic portion 60) changes from a first state S1 (the latching state, as shown in FIG. 1 ) to a first state S2 (the latching state, as shown in FIG. 1 ). Figure 4 As shown) moves (sways) in a predetermined direction L to a second state S2 (release state, such as Figure 5 As shown in the figure, the first latch feature 52 and the second latch feature 62 are disengaged from each other (for example, the first latch feature 52 and the second latch feature 62 are laterally offset from each other and no longer block each other). At this time, through the displacement of the second rail 24 toward the folding direction D1, the other of the auxiliary portion 64 and the driving portion 66 (for example, the driving portion 66) contacts the predetermined feature 67 on the sliding aid device 26 to drive (for example, push) the sliding aid device 26 to leave the first predetermined position K1 toward the folding direction D1.

[0035] It can be seen that in addition to contacting the elastic member 50 (the latch structure 33) through the auxiliary portion 64, the embodiment of the present invention causes the elastic member 50 (the elastic portion 60) to change from the first state S1 (such as Figure 4 As shown) moves to the second state S2 (as shown Figure 5As shown, in addition to disengaging the first latching feature 52 from the second latching feature 62, the driving portion 66 also contacts a predetermined feature 67 on the sliding assistance device 26 to forcibly drive (e.g., push) the sliding assistance device 26 away from the first predetermined position K1 in the closing direction D1, thereby ensuring that the sliding assistance device 26 can be displaced from the first predetermined position K1 in the closing direction D1.

[0036] Preferably, during the process of inserting the second rail 24 into the channel 37 of the first rail 22 in the closing direction D1, the auxiliary portion 64 generates a force through the mutual contact between the first guiding feature 68a and the second guiding section 56 of the latching structure 33, which helps the elastic portion 60 of the elastic member 50 move from the first state S1 (as Figure 4 shown) to the second state S2 (as Figure 5 shown).

[0037] As Figure 5 , Figure 6 and Figure 7 shown, the sliding rail assembly 20 further includes a working member 70 arranged on the first rail 22 and a predetermined structure 72 arranged on the second rail 24 (as Figure 6 shown, this part can also be referred to in conjunction with Figure 2 ), and the predetermined structure 72 is used in cooperation with the working member 70. Preferably, the working member 70 is pivotally connected to the first rail 22 (the longitudinal wall 36 thereof) through a shaft member 74, and the arrangement direction of the shaft member 74 is substantially the same as the transverse (or lateral, e.g., the Y-axis direction, as Figure 2 shown), and the working member 70 includes a working portion 76; the predetermined structure 72 is a space, such as an opening, but is not limited in practice. The predetermined structure 72 is, for example, located at or adjacent to the second wall 38b of the second rail 24. On the other hand, the rolling members 44 on the first side portion 46a are used to support between the first wall 34a of the first rail 22 and the first wall 38a of the second rail 24, and the rolling members 44 on the second side portion 46b are used to support between the second wall 34b of the first rail 22 and the second wall 38b of the second rail 24 (as Figure 6 shown).

[0038] When the elastic portion 60 of the elastic member 50 is in the second state S2 (as Figure 5 and Figure 6 shown), the sliding assistance device 26 can be displaced from the first predetermined position K1 in the closing direction D1 to a second predetermined position K2, so that the sliding assistance device 26 is close to the second end portion 22b of the first rail 22 (as Figure 7as shown). Further, when the second rail 24 (and the first rail 22) are both in a retracted position R relative to the third rail 28, and the sliding assist device 26 is in the second predetermined position K2, the slide rail assembly 20 is in a retracted state (for example, a fully retracted state, as Figure 7 shown). Among them, since the sliding assist device 26 is in the second predetermined position K2, the rolling members 44 of the sliding assist device 26 can be supported between the first rail 22 and the second rail 24, for example, supported between the first wall 34a of the first rail 22 and the first wall 38a of the second rail 24, and supported between the second wall 34b of the first rail 22 and the second wall 38b of the second rail 24, which helps to maintain a predetermined distance G between the second wall 34b (of the first rail 22) and the second wall 38b (of the second rail 24) (as Figure 7 shown), so as to help ensure the reliability of the cooperation between the predetermined structure 72 and the workpiece 70.

[0039] Preferably, at least one blocking portion 77 is further arranged on the first rail 22; when the sliding assist device 26 is in the second predetermined position K2, the blocking portion 77 can block the sliding assist device 26 to prevent the sliding assist device 26 from displacing in the retracting direction D1.

[0040] Preferably, the slide rail assembly 20 further includes an elastic feature 78 for providing an elastic force to the workpiece 70. Among them, when the second rail 24 is in the retracted position R relative to the first rail 22 (or the third rail 28), the second wall 38b of the second rail 24 can support the working portion 76 of the workpiece 70, and the elastic feature 78 accumulates a predetermined elastic force.

[0041] As Figure 8 shown, when the second rail 24 displaces from the retracted position R to the opening direction D2 relative to the first rail 22 (or the third rail 28), through the mutual engagement between the workpiece 70 and the predetermined structure 72, the second rail 24 and the first rail 22 can synchronously displace in the opening direction D2 relative to the third rail 28.

[0042] Specifically, when the second rail 24 displaces from the retracted position R to the opening direction D2 relative to the first rail 22 (or the third rail 28) by a predetermined stroke, the second wall 38b of the second rail 24 no longer supports the working portion 76 of the workpiece 70, and the elastic feature 78 releases the predetermined elastic force to the workpiece 70, causing the workpiece 70 to pivot by an angle, so that the working portion 76 of the workpiece 70 enters and is received in the predetermined structure 72, and the working portion 76 of the workpiece 70 engages with the predetermined structure 72 (for example, a predetermined wall 80 in the space) to enable the second rail 24 and the first rail 22 to displace in the opening direction D2 relative to the third rail 28 synchronously.

[0043] It is worth mentioning that before the second rail 24 is unloaded from the channel 37 of the first rail 22 in the opening direction D2, the synchronous displacement relationship between the second rail 24 and the first rail 22 can be released by a predetermined structure on the third rail 28. Since this part belongs to the technical scope that those skilled in the art can understand, for the sake of simplicity, it will not be elaborated here.

[0044] From this, it can be seen that the slide rail assembly 20 provided by the embodiment of the present invention has the following characteristics:

[0045] 1. Compared with the prior art, when the second rail 24 of the embodiment of the present invention is unloaded from the channel 37 of the first rail 22 (as Figure 4 shown), and during the process of the second rail 24 being reinserted into the channel 37 of the first rail 22 in the closing direction D1 (as Figure 5 shown), in addition to the auxiliary portion 64 of the second rail 24 contacting the elastic member 50 (the locking structure 33 thereof), so that the elastic member 50 (the elastic portion 60 thereof) moves from the first state S1 (as Figure 4 shown) to the second state S2 (as Figure 5 shown), for the first locking feature 52 and the second locking feature 62 to be unlocked from each other, the driving portion 66 of the second rail 24 also contacts a predetermined feature 67 on the sliding assistance device 26 to forcibly drive the sliding assistance device 26 away from the first predetermined position K1 in the closing direction D1, thereby ensuring that the sliding assistance device 26 is displaced from the first predetermined position K1 in the closing direction D1.

[0046] 2. When the sliding assistance device 26 is displaced from the first predetermined position K1 in the closing direction D1 to the second predetermined position K2, since the rolling members 44 of the sliding assistance device 26 can be supported between the first rail 22 and the second rail 24, for example, supported between the first wall 34a of the first rail 22 and the first wall 38a of the second rail 24, and supported between the second wall 34b of the first rail 22 and the second wall 38b of the second rail 24, it helps to maintain a predetermined spacing G between the first rail 22 (the second wall 34b thereof) and the second rail 24 (the second wall 38b thereof) (as Figure 7 shown). In this way, it helps to ensure the reliability of the cooperation between the predetermined structure 72 and the workpiece 70. For example, it can ensure the stability or reliability of the mutual locking between the workpiece 70 and the predetermined structure 72, so that the second rail 24 and the first rail 22 can synchronously displace relative to the third rail 28 in the opening direction D2.

[0047] 3. The sliding assist device 26 is displaced from the first predetermined position K1 to the second predetermined position K2, increasing the support stability at this location, which can enhance and ensure the reliability of the predetermined structure 72 to be used in conjunction with the workpiece 70, so as to ensure the synchronous displacement relationship between the second rail 24 and the first rail 22.

[0048] Although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, and various equivalent changes and modifications can be made without departing from the spirit of the present invention. Therefore, as long as the changes and variations of the above embodiments are within the scope of the spirit of the present invention, they will fall within the scope of the claims of this application.

Claims

1. A slide rail assembly, comprising a first rail, a second rail and a sliding assistance device, wherein, the first rail includes a channel, the second rail can longitudinally displace relative to the first rail, and the sliding assistance device is movably installed between the first rail and the second rail, and is characterized in that: one of the first rail and the sliding assistance device is provided with an elastic member, and the elastic member is configured with a first locking feature, and the other of the first rail and the sliding assistance device is configured with a second locking feature; through the mutual locking of the first locking feature and the second locking feature, it is used to prevent the sliding assistance device from displacing from a first predetermined position in a closing direction; wherein, the second rail includes an auxiliary portion and a driving portion; wherein, when the second rail is removed from the channel of the first rail and the second rail is re-inserted into the channel of the first rail in the closing direction, the second rail contacts the elastic member through one of the auxiliary portion and the driving portion, so that the elastic member moves from a first state to a second state, then the first locking feature and the second locking feature are mutually unlocked, and at this time, through the displacement of the second rail in the closing direction, the other of the auxiliary portion and the driving portion contacts a predetermined feature on the sliding assistance device, so as to drive the sliding assistance device to leave the first predetermined position in the closing direction.

2. The slide rail assembly according to claim 1, characterized in that, the sliding assistance device is located in the channel of the first rail.

3. The slide rail assembly according to claim 2, characterized in that, the sliding assistance device includes a plurality of rolling elements, and these rolling elements are supported between the first rail and the second rail.

4. The slide rail assembly according to claim 3, characterized in that, both the first rail and the second rail include a first wall, a second wall and a longitudinal wall connected between the first wall and the second wall; the sliding assistance device includes a first side portion, a second side portion and a longitudinal portion connected between the first side portion and the second side portion, and these rolling elements are arranged on the first side portion and the second side portion to support between the first walls of the first rail and the second rail, and to support between the second walls of the first rail and the second rail.

5. The slide rail assembly according to claim 3, characterized in that, the first rail has a first end portion and a second end portion with opposite positions; when the sliding assistance device is in the first predetermined position, the sliding assistance device is close to the first end portion of the first rail.

6. The slide rail assembly according to claim 5, characterized in that, when the sliding assistance device displaces from the first predetermined position in the closing direction to a second predetermined position, the sliding assistance device is close to the second end portion of the first rail.

7. A slide rail assembly, comprising a first rail, a second rail and a sliding assistance device, wherein, the first rail includes a channel, the sliding assistance device is located in the channel of the first rail, and is characterized in that: One of the first rail and the sliding assistance device is arranged with an elastic member, and the elastic member is configured with a first latching feature, and the other of the first rail and the sliding assistance device is configured with a second latching feature; through the mutual latching of the first latching feature and the second latching feature, it is used to prevent the sliding assistance device from displacing from a first predetermined position in a folding direction; Wherein, the second rail includes an auxiliary portion and a driving portion; Wherein, during the process that the second rail is inserted from outside the channel of the first rail into the channel of the first rail in the folding direction, the second rail contacts the elastic member through one of the auxiliary portion and the driving portion, so that the elastic member moves from a first state to a second state, then the first latching feature and the second latching feature are mutually released. At this time, through the displacement of the second rail in the folding direction, the other of the auxiliary portion and the driving portion contacts a predetermined feature on the sliding assistance device, so as to push the sliding assistance device to leave the first predetermined position in the folding direction; Wherein, the slide rail assembly further includes a third rail, and the first rail is movably installed between the third rail and the second rail; Wherein, the slide rail assembly further includes a working member arranged on the first rail and a predetermined structure arranged on the second rail; during the process that the second rail displaces relative to the first rail from a folding position in an opening direction, through the mutual latching of the working member and the predetermined structure, the second rail and the first rail can synchronously displace relative to the third rail in the opening direction.

8. The slide rail assembly according to claim 7, characterized in that, The sliding assistance device includes a plurality of rolling members, and these rolling members are supported between the first rail and the second rail.

9. The slide rail assembly according to claim 8, characterized in that, Both the first rail and the second rail include a first wall, a second wall and a longitudinal wall connected between the first wall and the second wall; the sliding assistance device includes a first side portion, a second side portion and a longitudinal portion connected between the first side portion and the second side portion, and these rolling members are arranged on the first side portion and the second side portion to be supported between the first walls of the first rail and the second rail and to be supported between the second walls of the first rail and the second rail.

10. The slide rail assembly according to claim 8, characterized in that, The first rail has a first end portion and a second end portion with opposite positions; when the sliding assistance device is in the first predetermined position, the sliding assistance device is close to the first end portion of the first rail.

11. The slide rail assembly according to claim 10, characterized in that, When the sliding assistance device displaces from the first predetermined position in the folding direction to a second predetermined position, the sliding assistance device is close to the second end portion of the first rail.

12. The slide rail assembly according to claim 7, characterized in that, The third rail is an outer rail, the first rail is a middle rail, and the second rail is an inner rail.

13. The slide rail assembly according to claim 12, characterized in that, The working member is pivotally connected to the first rail through a shaft member, and the working member includes a working portion; the predetermined structure is a space for accommodating the working portion of the working member.

14. The slide rail assembly according to claim 13, wherein, the arrangement direction of the shaft member is substantially the same as a transverse direction of the first rail.

15. The slide rail assembly according to claim 13, wherein, it further includes an elastic feature for providing an elastic force to the workpiece.

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