CN114766847A - Sliding rail assembly - Google Patents

Abstract

The invention relates to a slide rail assembly, which comprises a first rail, a second rail, a third rail and a switch piece. The second rail is movably mounted between the first rail and the third rail. The switch element can be switched to a first state or a second state. When the switch piece is in the second state, the second rail can be driven to a preset position in a folding direction by the third rail through the switch piece; when the third rail moves towards an opening direction relative to the second rail at the preset position, the switch piece can be driven from the second state to the first state.

Description

Sliding rail assembly

The application is a divisional application of an invention patent application with the application number of "201911134425.0" and the name of "slide rail assembly", which is filed by the applicant on 19/11/2019.

Technical Field

The present invention relates to a slide rail assembly, and more particularly, to a slide rail assembly having a shortened extension length, which facilitates maintenance of the slide rail assembly in a limited environmental space.

Background

For example, U.S. Pat. No. US10,244,868B2 discloses a slide rail assembly including a first rail, a second rail and a third rail. The third rail is provided with a switching piece which can be operated at a first switching position or a second switching position. When the second switching position is located, the third rail is allowed to drive the second rail in a second direction (retracting direction), so that the total length of the slide rail assembly is shortened, and the slide rail assembly is favorable for being applied to a narrow space environment. The switching piece is arranged on the third rail, so that a user can only operate the switching piece in a manual mode, and the sliding rail cannot be completely folded in case of not being manually switched back in time.

Based on this problem, and with different market demands, how to develop a different slide rail product becomes a problem that cannot be ignored.

Disclosure of Invention

The invention aims to provide a slide rail assembly which can switch a switch piece from one state to another state through a slide rail.

According to an aspect of the present invention, a sliding rail assembly includes a first rail, a second rail, a third rail and a switch. The second rail can move relative to the first rail; the third rail can be displaced relative to the second rail and is provided with a driving structure and a front contact feature; the switch piece can move relative to the second rail and is in one of a first state and a second state; when the second rail is at a first extending position relative to the first rail, the switch piece can be switched from the first state to the second state; when the third rail moves from a second extending position to a folding direction, the third rail contacts the switch piece in the second state through the driving structure, so that the third rail can drive the second rail to move to a preset position in the folding direction; when the third rail moves to a predetermined opening stroke in an opening direction relative to the second rail at the predetermined position, the third rail drives the switch member to switch from the second state to the first state through the front contact feature.

According to another aspect of the present invention, a sliding rail assembly includes a first rail, a second rail, a third rail and a switch. The second rail can move relative to the first rail; the third rail can be displaced relative to the second rail and is provided with a front contact feature; the switch piece can move relative to the second rail and is in one of a first state and a second state; wherein the switch member is switchable from the first state to the second state; wherein, the second rail can be at a preset position relative to the first rail; when the third rail moves to a predetermined opening stroke in an opening direction relative to the second rail at the predetermined position, the third rail drives the switch member to switch from the second state to the first state through the front contact feature.

According to another aspect of the present invention, a sliding rail assembly includes a first rail, a second rail, a third rail and a switch. The second rail can move relative to the first rail; the third rail is movably arranged in a channel of the second rail and can move relative to the second rail, and the third rail is provided with a rear contact feature; the switch piece can move relative to the second rail and is in one of a first state and a second state; when the third rail is detached from the channel of the second rail in an opening direction, if the switch member is switched from the first state to the second state, the switch member is driven to be switched from the second state to the first state through the rear contact feature in the process of being reinstalled to the channel of the second rail in a retracting direction by using the third rail.

Drawings

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

fig. 1 shows an exploded view of a slide rail assembly according to an embodiment of the invention.

Fig. 2 is an exploded view of the second rail and a switch according to the embodiment of the invention.

FIG. 3 is a schematic diagram of the switch device in a first state according to the embodiment of the present invention.

Fig. 4 is a schematic view of the switch member of the embodiment of the invention in the first state and in another viewing angle.

FIG. 5 is a schematic diagram of the switch member in a second state according to the embodiment of the present invention.

Fig. 6 is a schematic view of the switch member in the second state from another perspective according to the embodiment of the present invention.

Fig. 7 is an internal schematic view of a slide rail assembly in a folded state according to an embodiment of the present invention.

Fig. 8 is a schematic view illustrating the displacement of the slide rail assembly in an opening direction according to the embodiment of the invention.

Fig. 9 is a schematic view of the slide rail assembly of the embodiment of the invention in a first extended position.

Fig. 10 is a schematic view illustrating the slide rail assembly in an extended state and the switch member in the first state according to the embodiment of the invention.

Fig. 11 is a schematic view of the slide rail assembly in the extended state and the switch member in the second state according to the embodiment of the invention.

Fig. 12 is a schematic view illustrating the slide rail assembly moving in a retracting direction according to the embodiment of the present invention.

Fig. 13 is a schematic view illustrating the slide rail assembly moving to a position along a retracting direction according to the embodiment of the present invention.

Fig. 14 is a schematic view illustrating the second rail driven by the third rail and moving toward the retracting direction relative to the first rail according to the embodiment of the present invention.

Fig. 15 is a schematic view illustrating that the second rail is driven by the third rail and continuously moves relative to the first rail in the retracting direction according to the embodiment of the present invention.

Fig. 16 is a schematic view illustrating the second rail driven by the third rail in the retracting direction to be at a predetermined position relative to the first rail according to the embodiment of the present invention.

Fig. 17 is a schematic diagram illustrating that the second rail is at the predetermined position relative to the first rail and the third rail is displaced in the opening direction according to the embodiment of the present invention.

Fig. 18 is a schematic diagram illustrating that the third rail moves toward the opening direction to drive the switch element to be in the first state according to the embodiment of the invention.

Fig. 19 is a schematic view showing the switch member in the first state when the third rail is detached from the passage of the second rail in the opening direction according to the embodiment of the present invention.

Fig. 20 is a schematic view showing the switch member in the second state when the third rail is detached from the passage of the second rail in the opening direction according to the embodiment of the present invention.

Fig. 21 is a schematic view illustrating a passage of the third rail mounted to the second rail in the retracting direction according to the embodiment of the present invention.

Fig. 22 is a schematic view illustrating the opening/closing member being switched to the first state when the third rail is mounted to the passage of the second rail in the retracting direction according to the embodiment of the present invention.

Fig. 23 is a schematic view illustrating that the third rail releases the second hook from the first rail in the retracting direction according to the embodiment of the present invention.

Fig. 24 is a schematic view illustrating that the slide rail assembly of the embodiment of the invention carries a carrier and has a first length when the slide rail assembly is in the first extended position.

Fig. 25 is a schematic view illustrating the slide rail assembly having a second length when the slide rail assembly is at the predetermined position according to the embodiment of the invention.

Fig. 26 is a schematic view of the slide rail assembly of the embodiment of the invention in the predetermined position, and the third rail is detached from the second rail in the opening direction.

Detailed Description

As shown in fig. 1, a slide rail assembly 20 according to an embodiment of the present invention includes a first rail 22, a second rail 24 and a third rail 26. Wherein the second rail 24 is movably mounted between the first rail 22 and the third rail 26. In a further aspect of the present invention,

the first rail 22 has a front end f1 and a rear end r 1. The first rail 22 includes an upper wall 28a, a lower wall 28b and a longitudinal wall 30 connected between the upper wall 28a and the lower wall 28b, and the upper wall 28a, the lower wall 28b and the longitudinal wall 30 together define a channel for receiving the second rail 24.

Preferably, the slide assembly 20 further includes a front base 32 disposed on the longitudinal wall 30 of the first rail 22, and the front base 32 includes a guide feature 34 and a stop feature 36 adjacent the guide feature 34. Here, it is taken as an example that the guiding feature 34 includes a slope or a cambered surface.

Preferably, the slide assembly 20 further includes a rear base 38 disposed on the longitudinal wall 30 of the first rail 22, and the rear base 38 includes a first guiding section 40, a second guiding section 42 and a locking section 44 located between the first guiding section 40 and the second guiding section 42. Preferably, the first guiding section 40 and the second guiding section 42 both include an inclined surface or an arc surface, and the engaging section 44 is a groove, but not limited in implementation.

Preferably, at least one rear stop 46 and at least one front stop 48 are disposed adjacent to the rear end r1 and the front end f1 of the first rail 22, respectively. Here, the number of the rear stop portion 46 and the front stop portion 48 is two, but the embodiment is not limited thereto.

The second rail 24 has a front end f2 and a rear end r 2. The second rail 24 includes an upper wall 50a, a lower wall 50b and a longitudinal wall 52 connected between the upper wall 50a and the lower wall 50b, and the upper wall 50a, the lower wall 50b and the longitudinal wall 52 together define a channel for receiving the third rail 26. Wherein the second rail 24 has a first side L1 and a second side L2 opposite to each other; the first side L1 of the second rail 24 faces the first rail 22, and the second side L2 of the second rail 24 faces the third rail 26.

Preferably, the slide assembly 20 further includes a first detent mechanism disposed on the longitudinal wall 52 of the second rail 24. The first detent mechanism includes a first detent member 54 and a first elastic member 56 for providing an elastic force to the first detent member 54. Here, it is taken as an example that the first engaging member 54 includes a supporting portion 58, an engaging portion 60 and an installation feature 62 located between the supporting portion 58 and the engaging portion 60. The mounting feature 62 of the first catch 54 is pivotally connected to the second side L2 of the longitudinal wall 52 of the second rail 24 by a first pivot 64.

Preferably, the longitudinal wall 52 of the second rail 24 has a first through hole 66 communicating the first side L1 and the second side L2 of the second rail 24. The latching portion 60 of the first latching member 54 extends from the second side L2 of the second rail 24 through the first through hole 66 to the first side L1 of the second rail 24. On the other hand, the first elastic element 56 has a main portion 68 and an elastic portion 70 connected to the main portion 68. The body portion 68 is connected to the second side L2 of the longitudinal wall 52 of the second rail 24; the elastic portion 70 is elastically loaded to the first latch 54, and the elastic portion 70 is adjacent to the supporting portion 58.

Preferably, the slide rail assembly 20 further comprises a second detent mechanism disposed on the longitudinal wall 52 of the second rail 24. The second latch mechanism includes a second latch member 72 and a second elastic member 74 for providing an elastic force to the second latch member 72. Here, it is exemplified that the second latching member 72 includes a latching section 78, a supporting section 80 and a connecting feature 82 between the latching section 78 and the supporting section 80. The connecting feature 82 of the second latch 72 is pivotally connected to the second side L2 of the longitudinal wall 52 of the second rail 24 by a second pivot 84.

Preferably, the longitudinal wall 52 of the second rail 24 has a second through hole 86 communicating the first side L1 and the second side L2 of the second rail 24. The latching section 78 of the second latching member 72 extends from the second side L2 of the second rail 24 through the second through hole 86 to the first side L1 of the second rail 24. On the other hand, the second elastic member 74 is disposed on the longitudinal wall 52 of the second rail 24. The second elastic element 74 is elastically loaded to the second latching element 72, and the second elastic element 74 is adjacent to the latching section 78.

The third rail 26 has a front end f3 and a rear end r 3. The third rail 26 includes an upper wall 88a, a lower wall 88b and a longitudinal wall 90 connected between the upper wall 88a and the lower wall 88 b. Wherein the longitudinal wall 90 of the third rail 26 is provided with a drive structure 92, a front contact feature 94 and a rear contact feature 96, and the front contact feature 94 is located between the rear contact feature 96 and the drive structure 92.

Preferably, the longitudinal wall 90 of the third rail 26 is further provided with an operative feature 98 and a support feature 100.

Preferably, the driving structure 92, the front contact feature 94, the rear contact feature 96, the working feature 98 and the support feature 100 are all protrusions protruding relative to the longitudinal wall 90 of the third rail 26, and the protrusions are toward the second side L2 of the second rail 24, but the implementation is not limited thereto.

Preferably, a sliding aid is disposed between each two sliding rails of the sliding rail assembly 20 to facilitate the smoothness of the longitudinal displacement of the two sliding rails relative to each other. For example, a lower bead 102 and an upper bead 104 are disposed in the channel of the first rail 22 for supporting the lower wall 50b and the upper wall 50a of the second rail 24, respectively.

Preferably, the lower wall 50b and the upper wall 50a of the second rail 24 are further provided with a push-down portion 106 and a push-up portion 108 for respectively pressing against the rear ends of the lower bead 102 and the upper bead 104.

As shown in fig. 2 to 4, the embodiment of the present invention further includes a switch 110 movably disposed on the second rail 24. Here, the switch 110 is movably disposed adjacent to the front end portion f2 of the second rail 24, but the embodiment is not limited thereto. On the other hand, the second rail 24 has a first position-limiting portion 112, a second position-limiting portion 114 and a space 116 defined between the first position-limiting portion 112 and the second position-limiting portion 114, and the space 116 communicates with the first side L1 and the second side L2 of the second rail 24.

Preferably, the switch member 110 is pivotally connected to the first side L1 of the second rail 24 by a shaft member 118. The switch member 110 is provided with a switch portion 120 extending to the second side L2 of the second rail 24.

Preferably, the space 116 is a hole defined by substantially arcuate walls of the longitudinal walls 52 of the second rail 24. In addition, the space 116 has a first accommodating part K1 and a second accommodating part K2 communicating with each other. The switch member 110 is provided with a retaining feature 111, the second rail 24 is provided with a matching feature 25, and the retaining feature 111 and the matching feature 25 are of a male and female matching design, but the implementation is not limited thereto.

Preferably, the switch element 110 is movable relative to the second rail 24 to be in one of a first state S1 (shown in fig. 3 and 4) and a second state S2 (shown in fig. 5 and 6).

Preferably, the switch portion 120 of the switch element 110 has a first head portion 122, a second head portion 124 and a body portion 126 connected between the first head portion 122 and the second head portion 124. The first head part 122 is located on the first side L1 of the second rail 24, the second head part 124 is located on the second side L2 of the second rail 24, and the body part 126 can be supported on the arc-shaped hole walls of the first accommodating part K1 and the second accommodating part K2. When the switch element 110 is in the first state S1, the switch portion 120 of the switch element 110 is located in the first accommodating portion K1 of the space 116.

Preferably, the switch element 110 is further connected to the second rail 24 by an auxiliary shaft 128, and the switch element 110 is arranged with a bordered auxiliary guiding hole 130. The auxiliary guiding hole 130 has a substantially arc-shaped profile, and the auxiliary shaft 128 passes through a portion of the auxiliary guiding hole 130, so that the switch 110 can move within a limited range relative to the second rail 24 due to the cooperation of the auxiliary shaft 128 and the auxiliary guiding hole 130.

As shown in fig. 5 and 6, a user can apply a force F to the switch element 110 to switch the switch element 110 from the first state S1 to the second state S2. When the switch element 110 is in the second state S2, the switch portion 120 of the switch element 110 is located in the second accommodating portion K2 of the space 116, and the retaining feature 111 abuts against the matching feature 25 to be temporarily retained in the second state S2.

As shown in fig. 7, the slide rail assembly 20 is in a retracted state at a fully retracted position R. The rear stop portion 46 of the first rail 22 is used for stopping the rear end r2 of the second rail 24.

Further, the rear base 38 and the front base 32 have a distance therebetween; the first latch 54 is kept in a first predetermined state X1 in response to the elastic force of the first elastic member 56, and the position of the latch part 60 of the first latch 54 corresponds to the position of the guide feature 34 of the front base 32; the second latch 72 can be supported by the support feature 100 of the third rail 26 via the support section 80, so that the second latch 72 is maintained in an initial state Y1, the position of the latch section 78 of the second latch 72 is staggered from that of the rear base 38, and at this time, the second elastic element 74 is in a state of accumulating an elastic force. It should be noted that when the switch member 110 is in the first state S1, the switch portion 120 of the switch member 110 is not at the same longitudinal level as the drive structure 92, the front contact feature 94 and the rear contact feature 96 of the third rail 26 but is offset.

Preferably, one of the front contact feature 94 of the third rail 26 and the switch portion 120 of the switch member 110 includes a guide surface. Here, the front contact feature 94 has a guiding surface 132, and the switch portion 120 is a cylinder (e.g., a cylinder), wherein the guiding surface 132 is, for example, an inclined surface or an arc surface, but the implementation is not limited thereto.

Preferably, one of the rear contact feature 96 of the third rail 26 and the switch portion 120 of the switch element 110 includes a guide surface. The rear contact feature 96 has a guiding surface 134, wherein the guiding surface 134 is, for example, a slope or a cambered surface, but the implementation is not limited thereto.

Preferably, one of the driving structure 92 of the third rail 26 and the switch portion 120 of the switch element 110 includes a guiding surface. The driving structure 92 has a guiding surface 136, wherein the guiding surface 136 is, for example, an inclined surface or an arc surface, but the implementation is not limited thereto. In addition, the driving structure 92 has a contact wall 138 (e.g., a standing wall).

As shown in fig. 8, when the second rail 24 is displaced to a position in an opening direction D1 relative to the first rail 22, the latching portion 60 of the first latching member 54 contacts the guiding feature 34 of the front base 32.

As shown in fig. 9, when the second rail 24 is continuously displaced in the opening direction D1 relative to the first rail 22, the engaging portion 60 of the first engaging member 54 is guided by the guiding feature 34 of the front base 32, so that the first engaging member 54 is deflected by an angle, the first elastic member 56 accumulates an elastic force in response to the deflection angle of the first engaging member 54, until the engaging portion 60 of the first engaging member 54 passes the guiding feature 34 when the second rail 24 is displaced in a first extending position E1 relative to the first rail 22, the elastic portion 70 of the first elastic member 56 releases the elastic force, so that the first engaging member 54 returns to the first predetermined state X1, at which time the engaging portion 60 of the first engaging member 54 is blocked by the blocking feature 36 of the front base 32, so as to prevent the second rail 24 from being displaced in a retracting direction D2 from the first extending position E1.

As shown in fig. 10 and 11, when the second rail 24 is located at the first extending position E1 relative to the first rail 22, the third rail 26 can be further displaced relative to the second rail 24 in the opening direction D1 to a second extending position E2. At this time, the slide rail assembly 20 is in a fully extended state.

Further, when the second rail 24 is located at the first extended position E1 relative to the first rail 22, the switch element 110 can be manually switched from the first state S1 to the second state S2. When the switch member 110 is in the second state S2, the switch portion 120 of the switch member 110 and the drive structure 92, front contact feature 94 and rear contact feature 96 of the third rail 26 are located at the substantially same longitudinal level H (as shown in fig. 11).

It should be noted that, as shown in fig. 12 and 13, once the third rail 26 is displaced relative to the second rail 24 such that the supporting feature 100 no longer supports the supporting section 80 of the second latch 72, the second latch 72 is immediately switched from the initial state Y1 to a non-initial state Y2 in response to the second elastic member 74 releasing the elastic force. In addition, the first latch 54 further includes a release portion 140 adjacent to the latch portion 60. Preferably, one of the tripping portion 140 and the working feature 98 includes an inclined surface or an arc surface, and the tripping portion 140 includes an inclined surface (or an arc surface) for example, but is not limited in implementation.

Fig. 11 to 13 show that the switch element 110 is in the second state S2, and when the third rail 26 is displaced to a stroke from the second extending position E2 to the retracting direction D2 relative to the second rail 24 in the first extending position E1, the third rail 26 can contact the releasing portion 140 of the first detent 54 through the operating feature 98 to generate a force, such that the first detent 54 pivots from the first predetermined state X1 (shown in fig. 12) to a second predetermined state X2 (shown in fig. 13) in response to the force, such that the detent portion 60 of the first detent 54 is no longer blocked by the blocking feature 36 of the front base 32, so as to allow the second rail 24 to be displaced from the first extending position E1 to the retracting direction D2. When the third rail 26 moves from the second extending position E2 to the retracting direction D2, the third rail 26 can contact the switch portion 120 of the switch element 110 in the second state S2 through the contact wall 138 of the driving structure 92, so that the third rail 26 can drive the second rail 24 to move to the retracting direction D2.

As shown in fig. 14 to 16, the second latch 72 further includes a release section 142 adjacent to the support section 80. Preferably, one of the disengaging section 142 and the support feature 100 includes an inclined surface or an arc surface, and the disengaging section 142 includes an inclined surface (or an arc surface) for example, but is not limited in implementation.

When the third rail 26 moves in the retracting direction D2, the third rail 26 can contact the switch portion 120 of the switch element 110 in the second state S2 through the contact wall 138 of the driving structure 92, so that the third rail 26 can drive the second rail 24 to move in the retracting direction D2 to a predetermined position P (as shown in fig. 16). When the second rail 24 is at the predetermined position P, the second rail 24 is clamped on the rear base 38 by the second clamping mechanism.

Specifically, when the second rail 24 is displaced to the predetermined position P in the retracting direction D2, the catching section 78 of the second catching piece 72 in the non-initial state Y2 contacts the second guiding section 42 of the rear base 38 (as shown in fig. 14), and a force is generated by the contact between the latching section 78 of the second latching member 72 and the second guiding section 42 of the rear base 38, so that the second latching member 72 pivots an angle to be no longer in the non-initial state Y2, and the second elastic member 74 accumulates an elastic force (as shown in fig. 15), until the second rail 24 is at the predetermined position P, the second latch 72 returns to the non-initial state Y2 in response to the second elastic element 74 releasing the elastic force, so that the latching section 78 of the second latch 72 is latched to the latching section 44 of the rear base 38 (as shown in fig. 16), for preventing the second rail 24 from moving from the predetermined position P to the opening direction D1 or the closing direction D2 relative to the first rail 22.

It should be noted that when the second rail 24 is located at the predetermined position P relative to the first rail 22, and the engaging section 78 of the second engaging member 72 is engaged with the engaging section 44 of the rear base 38, at this time, since the total length of the slide rail assembly 20 is shortened and the second rail 24 is in the locked state, the third rail 26 of the slide rail assembly 20 cannot occupy too much space when being pulled out in the opening direction D1 relative to the second rail 24, which is beneficial to narrow space usage.

As shown in fig. 17 to 19, when the second rail 24 is located at the predetermined position P relative to the first rail 22, the third rail 26 can be displaced relative to the second rail 24 in the opening direction D1 until the third rail 26 contacts the switch portion 120 of the switch element 110 through the guiding surface 132 of the front contact feature 94 when the second rail 24 is displaced to a predetermined opening stroke, so as to drive the switch element 110 to be switched from the second state S2 (shown in fig. 17) to the first state S1 (shown in fig. 18), and the third rail 26 can be detached relative to the second rail 24 located at the predetermined position P in the opening direction D1 (shown in fig. 19).

Therefore, when the third rail 26 is displaced towards the opening direction D1 relative to the second rail 24 at the predetermined position P, the front contact feature 94 can drive the switch element 110 to transition from the second state S2 to the first state S1, so as to ensure that the switch element 110 can maintain the first state S1. In particular, when the third rail 26 is removed by being displaced in the opening direction D1 relative to the second rail 24, the switch element 110 can be ensured to maintain the first state S1.

As shown in fig. 19 and 20, after the third rail 26 is detached from the channel of the second rail 24 in the opening direction D1 relative to the second rail 24, although the switch element 110 is already in the first state S1 (as shown in fig. 19), if other factors (such as others or external forces) unintentionally switch the switch element 110 from the first state S1 to the second state S2 (as shown in fig. 20), the switch element 110 is driven by the rear contact feature 96 to be switched from the second state S2 to the first state S1 in the process of being reinstalled into the channel of the second rail 24 in the retracting direction D2 by using the third rail 26.

As shown in fig. 20 to 22, when the third rail 26 is being re-installed to the channel of the second rail 24 in the retracting direction D2, the third rail 26 contacts the switch portion 120 of the switch element 110 through the guiding surface 134 of the rear contact feature 96, so as to drive the switch element 110 to be switched from the second state S2 (shown in fig. 21) to the first state S1 (shown in fig. 22).

As shown in fig. 16 and 23, when the third rail 26 is displaced in the retracting direction D2 relative to the second rail 24 at the predetermined position P, the second latching member 72 is switched from the non-initial state Y2 (shown in fig. 16) to the initial state Y1 (shown in fig. 23) by a force generated by the supporting feature 100 of the third rail 26 contacting the releasing section 142 of the second latching member 72, and the supporting feature 100 of the third rail 26 supports the supporting section 80 of the second latching member 72 again, so that the second latching member 72 is kept in the initial state Y1, the latching section 78 of the second latching member 72 is no longer latched at the latching section 44 of the rear base 38, so as to allow the second rail 24 to be retracted in the retracting direction D2 from the predetermined position P relative to the first rail 22, and the switch 110 is switched to the first state S1, so that the third rail 26 can be fully retracted in the retracting direction D2 relative to the second rail 24 (i.e. retracted position D2) relative to the first rail 24 (i.e. partially retracted in the engaging position D1 when the switch 110 is switched to the first state S1 See fig. 7).

It can be seen that when the switch element 110 is in the first state S1 (as shown in fig. 22), it can be used to allow the third rail 26 to be displaced relative to the second rail 24 in the retracting direction D2 to a fully retracted position R (see fig. 7).

As shown in fig. 24 to 26, according to the above configuration, the slide rail assembly 20 according to the embodiment of the present invention can be applied in a narrow space environment. Wherein the first rail 22 is mountable to a frame (not shown); the third rail 26 can carry a carrier 144. When the second rail 24 is in the first extended position E1 relative to the first rail 22, the slide rail assembly 20 has a first length M1. The third rail 26 can be displaced relative to the second rail 24 in the opening direction D1 to the second extending position E2 (as shown in fig. 24), and a first space W1 is formed between the front end f3 of the third rail 26 (or the supporting object 144) and an obstacle 146 (e.g., a wall, a door, or other environmental obstacle). However, if the first space W1 is too narrow, the maintenance of the carriage 144 or the rail assembly 20 by the user in the field cannot be performed smoothly. Therefore, a user can operate the second rail 24 to move from the first extended position E1 to the retracted position D2 to the predetermined position P (as shown in fig. 25, this portion can also refer to fig. 16) relative to the first rail 22, so that a second space W2 between the front end portion f3 of the third rail 26 and the obstacle 146 is wider relative to the first space W1, which is beneficial for a field operator to detach the supporting object 144 or perform maintenance operations related to the slide rail assembly 20. When the second rail 24 is at the predetermined position P relative to the first rail 22, the slide rail assembly 20 can be shortened to a second length M2, and the second length M2 is smaller than the first length M1.

Once the second rail 24 is in the predetermined position P relative to the first rail 22, the third rail 26 can be detached from the second rail 24 in the opening direction D1.

From the above description, it can be seen that the enhanced efficacy and advantages of the present invention are: the switch element 110 can be pulled out or re-inserted by the sliding rail to achieve the fool-proof function, i.e. the user can restore the switch element 110 from the second state S2 to the first state S1 without manually pulling the switch element 110. According to this configuration, it is also helpful to ensure that the third rail 26 can be displaced to the fully retracted position R in the retracted direction D2 relative to the second rail 24 when the sliding rail assembly 20 is applied in a narrow environmental space.

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 (19)

1. A slide rail assembly comprises a first rail, a second rail and a third rail, wherein the second rail can move relative to the first rail; the third rail can be displaced relative to the second rail, characterized in that:

The third rail is provided with a driving structure and a front contact characteristic; and

the sliding rail assembly also comprises a switch piece which can move relative to the second rail and is in one of a first state and a second state, and the switch piece is provided with a switch part;

when the second rail is at a first extending position relative to the first rail, the switch piece can be switched from the first state to the second state;

when the third rail moves from a second extending position to a folding direction, the third rail contacts the switch part of the switch piece in the second state through the driving structure, so that the third rail can drive the second rail to move to a preset position in the folding direction;

when the third rail moves to a predetermined opening stroke in an opening direction relative to the second rail at the predetermined position, the third rail drives the switch member to switch from the second state to the first state through the front contact feature.

2. The slide rail assembly of claim 1 wherein the third rail is further provided with a rear contact feature; when the third rail is detached from a channel of the second rail in the opening direction, if the switch member is switched from the first state to the second state, the switch member is driven to be switched from the second state to the first state through the rear contact feature in the process of being reinstalled to the channel of the second rail in the retracting direction by using the third rail.

3. The slide rail assembly of claim 1 wherein when the second rail is at the predetermined position and the driving structure of the third rail contacts the switch member in the second state, the third rail cannot move relative to the second rail in the retracting direction.

4. The slide rail assembly of claim 3 wherein when the switch member is in the first state, the driving structure of the third rail fails to contact the switch member to allow the third rail to move relative to the second rail in the retracting direction to a fully retracted position.

5. The slide rail assembly of claim 2 wherein the second rail is movably mounted between the first rail and the third rail, the second rail having a first side and a second side; the first side of the second rail faces the first rail, and the second side of the second rail faces the third rail.

6. The slide rail assembly of claim 5 wherein the second rail has a first stop portion, a second stop portion and a space defined between the first stop portion and the second stop portion, the space communicating the first side and the second side of the second rail; the switch member is pivoted to the first side of the second rail through a shaft member, and the switch portion passes through a part of the space from the first side of the second rail and extends to the second side of the second rail.

7. The slide assembly of claim 6 wherein the switch portion of the switch member and the front and rear contact features of the third rail are at substantially the same longitudinal level when the switch member is in the second state.

8. The slide assembly of claim 6 wherein one of the front contact feature of the third rail and the switch portion of the switch member includes a guide surface.

9. The slide rail assembly of claim 6 wherein one of the rear contact feature of the third rail and the switch portion of the switch member includes a guide surface.

10. The slide rail assembly of claim 1 wherein the slide rail assembly has a first length when the second rail is in the first extended position relative to the first rail; when the second rail is at the predetermined position relative to the first rail, the slide rail assembly has a second length smaller than the first length.

11. The slide rail assembly of claim 1 further comprising a front base disposed on the first rail, the front base including a blocking feature; the slide rail assembly also comprises a first clamping mechanism arranged on the second rail; when the second rail is at the first extending position, the first clamping mechanism is positioned adjacent to the blocking feature of the front base to prevent the second rail from moving from the first extending position to the folding direction; when the second rail is at the first extending position, the first clamping part responds to the elastic force of the first elastic part and is positioned at the blocking characteristic adjacent to the front base.

12. The slide rail assembly of claim 1 further comprising a rear base disposed on the first rail and a second detent mechanism disposed on the second rail; when the second rail moves from the first extending position to the preset position in the closing direction, the second rail is clamped on the rear base through the second clamping mechanism to prevent the second rail from moving from the preset position to the opening direction; when the second rail is at the preset position, the second clamping part responds to the elastic force of the second elastic part to clamp the rear base.

13. A slide rail assembly comprises a first rail, a second rail and a third rail, wherein the second rail can move relative to the first rail; the third rail can be displaced relative to the second rail, characterized in that:

the third rail is provided with a driving structure and a front contact characteristic; and

the sliding rail assembly also comprises a switch piece which can move relative to the second rail and is in one of a first state and a second state, and the switch piece is provided with a switch part;

wherein the switch member is switchable from the first state to the second state;

Wherein, the second rail can be at a preset position relative to the first rail;

when the second rail is at a first extending position relative to the first rail, the switch piece can be switched from the first state to the second state; when the third rail moves from a second extending position to a folding direction, the third rail contacts the switch part of the switch piece in the second state through the driving structure, so that the third rail can drive the second rail to move to the preset position in the folding direction;

when the third rail moves to a predetermined opening stroke in an opening direction relative to the second rail at the predetermined position, the third rail drives the switch member to switch from the second state to the first state through the front contact feature.

14. The slide rail assembly of claim 13 wherein the second rail is movably mounted between the first rail and the third rail, the second rail having a first side and a second side; a first side of the second rail faces the first rail, and a second side of the second rail faces the third rail; the second rail is provided with a first limiting part, a second limiting part and a space defined between the first limiting part and the second limiting part, and the space is communicated with the first side and the second side of the second rail; the switch part passes through a part of the space from the first side of the second rail and extends to the second side of the second rail.

15. The slide rail assembly of claim 13 further comprising a front base disposed on the first rail, the front base including a blocking feature; and a first clamping mechanism arranged on the second rail; when the second rail is at the first extending position, the first clamping mechanism is positioned adjacent to the blocking feature of the front base to prevent the second rail from moving from the first extending position to the folding direction; the slide rail assembly also comprises a rear base arranged on the first rail and a second clamping mechanism arranged on the second rail; when the second rail moves from the first extending position to the predetermined position in the closing direction, the second rail is clamped on the rear base through the second clamping mechanism to prevent the second rail from moving from the predetermined position to the opening direction.

16. A slide rail assembly comprises a first rail, a second rail and a third rail, wherein the second rail can move relative to the first rail; the third rail is movably arranged in a channel of the second rail and can move relative to the second rail, and is characterized in that:

the third rail is provided with a driving structure and a rear contact feature; and

the sliding rail assembly also comprises a switch piece which can move relative to the second rail and is in one of a first state and a second state, and the switch piece is provided with a switch part;

When the third rail is detached from the channel of the second rail in an opening direction, if the switch piece is switched from the first state to the second state, the switch piece is driven to be switched from the second state to the first state through the rear contact feature in the process of being reinstalled to the channel of the second rail in a retracting direction by utilizing the third rail;

when the second rail is at a first extending position relative to the first rail, the switch piece can be switched from the first state to the second state; when the third rail moves from a second extending position to the folding direction, the third rail contacts the switch part of the switch component in the second state through the driving structure, so that the third rail can drive the second rail to move to a preset position to the folding direction.

17. The slide rail assembly of claim 16 wherein the second rail is movably mounted between the first rail and the third rail, the second rail having a first side and a second side; a first side of the second rail faces the first rail, and a second side of the second rail faces the third rail; the second rail is provided with a first limiting part, a second limiting part and a space defined between the first limiting part and the second limiting part, and the space is communicated with the first side and the second side of the second rail; the switch member is pivoted to the first side of the second rail through a shaft member, and the switch portion passes through a part of the space from the first side of the second rail and extends to the second side of the second rail.

18. The slide rail assembly of claim 17 further comprising a front base disposed on the first rail, the front base including a blocking feature; the slide rail assembly further comprises a first clamping mechanism arranged on the second rail, and when the second rail is located at the first extension position, the first clamping mechanism is located at a blocking feature adjacent to the front base and used for preventing the second rail from moving from the first extension position to the folding direction.

19. The slide rail assembly of claim 17 further comprising a rear base disposed on the first rail and a second detent mechanism disposed on the second rail; when the second rail moves from the first extending position to the closing direction to the preset position, the second rail is clamped on the rear base through the second clamping mechanism so as to prevent the second rail from moving from the preset position to the opening direction.

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