Sequential movement sliding rail assembly and working method thereof

Abstract

The invention relates to a sequential movement sliding rail assembly which comprises a middle inner rail rear locking device, a lock pin and a middle outer rail rear locking device. When the sliding rail is in a completely closed state to a first pull-out state, the lock pin is clamped in the middle inner rail rear locking device so that the inner rail and the middle rail can be locked; in the conversion process of the sliding rail between the first pull-out state and the second pull-out state, after the lock pin clamped in the middle inner rail rear locking device makes contact with the middle outer rail rear locking device, the lock pin slides into the middle outer rail rear locking device from the middle inner rail rear locking device along with movement of the sliding rail and is clamped. And from the second pull-out state of the sliding rail to the complete pull-out state of the sliding rail, the lock pin is clamped in the middle and outer rail rear lock device so that the middle rail and the outer rail can be locked. According to the embodiment of the invention, the stability of sequential pulling of the sliding rails is improved, and the phenomenon that the rails are separated from each other in the sliding rail pulling process is avoided.

Description

Technical Field

[0001] The invention relates to a slide rail, in particular to a sequential motion slide rail assembly and a working method thereof. Background Art

[0002] Slide rails are usually installed in the drawer structure of furniture or electrical appliances. The drawer structure includes a cabinet body and a drawer that can be pulled out or pushed in relative to the cabinet body. The outer rails of the slide rails are fixed to the two inner walls of the cabinet body, and the inner rails are fixed to the two sides of the drawer. When the drawer is pulled out, the inner rail drives the middle rail, and the middle rail drives the outer rail, so that the entire slide rail is pulled out. When the drawer is pushed in, the inner rail is pushed in and drives the middle rail to push in until the entire slide rail is closed.

[0003] The problem that such a slide rail structure is prone to is that during the process of pulling out or pushing in, the multiple sections of the slide rail are unstable, and during the sliding process, the sections of the slide rail are not firmly engaged, so that the slide rail is easy to come off when the drawer is pulled out. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention discloses a sequential motion slide rail assembly and a working method thereof.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A sequential motion slide rail assembly, comprising a slide rail and a slide rail rear locking device; the slide rail comprises an inner rail, a middle rail slidable relative to the inner rail, and an outer rail slidable relative to the middle rail; the slide rail rear locking device comprises a middle inner rail rear locking device arranged on the inner rail and close to the closed end of the inner rail, a locking pin arranged on the middle rail and close to the closed end of the middle rail, and a middle outer rail rear locking device arranged on the outer rail and located in the middle of the outer rail;

[0007] When the slide rail is in a fully closed state or in a first pulled-out state, the locking pin is stuck in the middle inner rail rear locking device so that the inner rail is locked with the middle rail;

[0008] During the transition of the slide rail between the first pulled-out state and the second pulled-out state, after the locking pin stuck in the middle inner rail rear locking device contacts the middle outer rail rear locking device, it slides from the middle inner rail rear locking device to the middle outer rail rear locking device and gets stuck as the slide rail moves; or, after the locking pin stuck in the middle outer rail rear locking device contacts the middle inner rail rear locking device, it slides from the middle outer rail rear locking device to the middle inner rail rear locking device and gets stuck as the slide rail moves;

[0009] In the second pulled-out state to the fully pulled-out state of the slide rail, the locking pin is stuck in the middle and outer rail rear locking device so that the middle rail is locked with the outer rail.

[0010] Its further technical solution is: the middle inner rail rear locking device includes a first oblique arm, a first short arm and a first notch surrounded by the first oblique arm and the first short arm; the middle outer rail rear locking device includes a second oblique arm, a second short arm and a second notch surrounded by the second oblique arm and the second short arm; the straight line where the edge of the second notch is located is tangent to the edge of the first oblique arm; the straight line where the edge of the first notch is located is tangent to the straight line where the second oblique arm is located; the first short arm and the second short arm are both at a predetermined angle to the moving direction of the slide rail to clamp the locking pin.

[0011] Its further technical solution is: a sliding track is opened on the middle rail; the locking pin passes through the sliding track, and the two ends of the locking pin are respectively exposed from the two sides of the middle rail; the first end of the locking pin is used to extend into the middle outer rail rear locking device and slide in the middle outer rail rear locking device; the second end of the locking pin is used to extend into the middle inner rail rear locking device and slide in the middle inner rail rear locking device.

[0012] Its further technical solution is: the sliding rail rear locking device also includes a torsion spring fixed to the middle rail; the torsion spring includes a first bent arm and a second bent arm, and the common end of the first bent arm and the second bent arm forms an elastic raised angle, and the raised angle coincides with at least a portion of the sliding rail, so that when the locking pin slides in the sliding rail, it can move between the first bent arm and the second bent arm and be stuck in the range of the first bent arm or the range of the second bent arm.

[0013] A further technical solution is as follows: a rotatable sleeve is arranged outside the locking pin, and the locking pin moves relative to the torsion spring via the sleeve.

[0014] A further technical solution is as follows: the sequential motion slide rail assembly further comprises a slide rail front locking device; the slide rail front locking device comprises a middle inner rail front locking device arranged on the middle rail and close to the open end of the middle rail, a locking block A arranged in the middle of the inner rail, and a locking block B arranged in the middle of the inner rail and capable of sliding relative to the inner rail in a direction perpendicular to the movement of the slide rail;

[0015] When the slide rail is fully pulled out, the front locking device of the middle inner rail contacts the locking block B and can be inserted between the locking block A and the locking block B after the locking block B is pushed away, so that the middle rail is locked with the inner rail.

[0016] Its further technical solution is: the slide rail front locking device includes a push rod and a push block; one end of the push rod is fixed to the push block, and the other end of the push rod is provided with a push surface for pushing the lock block B so that the middle inner rail front locking device is disengaged from between the lock block A and the lock block B, so that the middle rail and the inner rail are unlocked.

[0017] Its further technical solution is: the slide rail front locking device includes a sliding seat; the locking block B can slide in the slideway of the sliding seat; the middle inner rail front locking device can contact and push the locking block B from the first end of the slideway; and a spring sheet is arranged at the second end of the slideway.

[0018] A working method of a sequential motion slide rail assembly implemented by the sequential motion slide rail assembly described in any one of the above, comprising an opening step and a closing step of the slide rail; the opening step of the slide rail comprises:

[0019] When the slide rail is in a fully closed state, the locking pin is locked in the middle inner rail rear locking device so that the inner rail is locked with the middle rail;

[0020] The slide rail changes from the fully closed state to the first pulled-out state: the middle rail and the inner rail are pulled out simultaneously until the locking pin contacts the middle and outer rails and then the locking device is locked;

[0021] The slide rail changes from the first pulled-out state to the second pulled-out state: the lock pin stuck in the middle inner rail rear locking device slides from the middle inner rail rear locking device to the middle outer rail rear locking device and gets stuck, the inner rail is unlocked from the middle rail, and the middle rail is locked from the outer rail;

[0022] The slide rail changes from the second pulled-out state to the slide rail fully opened state: the inner rail continues to be pulled out until the slide rail is fully opened;

[0023] The closing step of the slide rail comprises:

[0024] The slide rail is transformed from the fully opened state to the second pulled-out state: the inner rail is pushed in until the locking pin contacts the rear locking device of the middle inner rail;

[0025] The slide rail changes from the second pulled-out state to the first pulled-out state: the lock pin stuck in the middle outer rail rear locking device slides from the middle outer rail rear locking device to the middle inner rail rear locking device and gets stuck; the middle rail and the outer rail are unlocked, and the middle rail and the inner rail are locked;

[0026] The slide rail changes from the first pulled-out state to the fully closed state of the slide rail: the middle rail and the inner rail are pushed in together until the slide rail is fully closed.

[0027] A further technical solution is as follows: before the slide rail enters the fully open state, it also includes a fully locked state of the slide rail: after the front locking device of the middle inner rail contacts the locking block B and pushes the locking block B away, it is clamped between the locking block A and the locking block B, so that the middle rail is locked with the inner rail;

[0028] When the slide rail is pushed in from the fully open state, it also includes an unlocking process of the middle rail and the inner rail: the push rod pushes the locking block B so that the front locking device of the middle inner rail is disengaged from between the locking block A and the locking block B, so that the middle rail and the inner rail are unlocked.

[0029] The beneficial effects of the embodiments of the present invention are as follows:

[0030] The present invention provides a rear locking device for the slide rail, so that the slide rail can realize a stable opening process and a stable closing process through the function of automatic sequential locking. Moreover, while increasing the stability of the slide rail, the middle rail and the inner rail can be stably and safely locked, and the middle rail and the outer rail can be stably and safely locked, avoiding the phenomenon of the rails being separated from each other during the process of pulling out the slide rail.

[0031] The embodiment of the present invention further provides a front locking device for the inner rail, which can ensure that the slide rail can be stably pulled out and pushed in, and further ensure that the rails can be stably locked even when the slide rail is fully pulled out. This further improves the stability of the slide rail, and at the same time ensures that the rails will not be pulled apart even when the slide rail is fully pulled out. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of the slide rail in an embodiment of the present invention.

[0033] Figure 2 for Figure 1 Enlarged schematic diagram of part A.

[0034] Figure 3 for Figure 1 Schematic diagram of the enlarged portion B.

[0035] Figure 4 for Figure 1 Enlarged schematic diagram of part C.

[0036] Figure 5 Schematic diagram of the structure of the torsion spring in the embodiment of the present invention.

[0037] Figure 6 Schematic diagram of the fully closed state of the slide rail in an embodiment of the present invention.

[0038] Figure 7 Schematic diagram of the first extended state of the slide rail in an embodiment of the present invention.

[0039] Figure 8 It is an enlarged schematic diagram of the rear locking device of the slide rail in the first pulled-out state of the slide rail in an embodiment of the invention.

[0040] Fig. 9It is an enlarged schematic diagram of the rear locking device of the slide rail in the intermediate process of the slide rail changing from the first pulled-out state to the second pulled-out state in an embodiment of the present invention.

[0041] Fig.10 It is an enlarged schematic diagram of the rear locking device of the slide rail in the second extended state of the slide rail according to the embodiment of the present invention.

[0042] Fig.11 It is an enlarged schematic diagram of the rear locking device of the slide rail in the intermediate process of the slide rail being transferred from the second extended state to the fully extended state in an embodiment of the present invention.

[0043] Fig.12 This is a schematic diagram of a state where the slide rail is fully pulled out in an embodiment of the present invention.

[0044] Fig.13 for Fig.12 An enlarged schematic diagram of part F.

[0045] Fig.14 for Figure 1 Enlarged schematic diagram of part D in the figure.

[0046] Fig.15 Schematic diagram of a partial structure of the front locking device of the slide rail in an embodiment of the present invention.

[0047] Fig.16 for Fig.12 Enlarged schematic diagram of part G in the middle.

[0048] In the figure: 1, inner rail; 11, middle inner rail rear locking device; 111, first oblique arm; 112, first short arm; 113, first notch; 12, locking block A; 13, locking block B; 14, sliding seat; 15, push rod; 16, push block; 17, compression spring; 18, spring piece; 2, middle rail; 21, locking pin; 22, sliding rail; 23, torsion spring; 231, first fixed arm; 232, second fixed arm; 233, first bent arm; 234, second bent arm; 235, raised angle; 24, bushing; 25, middle inner rail front locking device; 3, outer rail; 31, middle outer rail rear locking device; 311, second oblique arm; 312, second short arm; 313, second notch; 4, middle rail retainer; 5, outer rail retainer. DETAILED DESCRIPTION

[0049] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0050] Figure 1 Schematic diagram of the structure of the slide rail in the embodiment of the present invention. Figure 1As shown, the slide rail includes an inner rail 1, a middle rail 2 and an outer rail 3. The inner rail 1 is mounted on the middle rail 2 through a middle rail holder 4, and the inner rail 1 can slide relative to the middle rail 2. The middle rail 2 is mounted on the outer rail 3 through an outer rail holder 5. The middle rail 2 can slide relative to the outer rail 3. A slide rail rear locking device is provided on the slide rail.

[0051] The slide rail rear locking device includes a middle inner rail rear locking device 11, a locking pin 21 and a middle outer rail rear locking device 31. The middle inner rail rear locking device 11 is arranged on the inner rail 1, and the position of the middle inner rail rear locking device 11 is close to the closed end of the inner rail 1. The locking pin 21 is arranged on the middle rail 2, and the position of the locking pin 21 is close to the closed end of the middle rail 2. When the inner rail 1 slides relative to the middle rail 2 until the inner rail 1 and the middle rail 2 are completely closed, the positions of the middle inner rail rear locking device 11 and the locking pin 21 are corresponding. The middle outer rail rear locking device 31 is arranged on the outer rail 3, and the middle outer rail rear locking device 31 is located in the middle part of the outer rail 3. In this paragraph and other parts of this article, the open end of the slide rail refers to the end on the slide rail close to the pull-out direction of the slide rail, the closed end of the slide rail refers to the end on the slide rail close to the closing direction of the slide rail, and the middle part of the slide rail refers to the part between the closed end and the open end of the slide rail. Figure 1 In the embodiments shown in other figures, the direction indicated by the arrow X is the pulling-out direction of the slide rail, and the opposite direction indicated by the arrow X is the closing direction of the slide rail.

[0052] Figure 2 for Figure 1 The enlarged schematic diagram of part A in FIG. Figure 2 As shown, the middle inner rail rear locking device 11 includes a first oblique arm 111, a first short arm 112, and a first notch 113 surrounded by the first oblique arm 111 and the first short arm 112. The first notch 113 is approximately parallel to the sliding direction of the slide rail, and the first short arm 112 is located at one end of the first notch 113 and is at a preset angle relative to the sliding direction of the slide rail so as to catch the lock pin 21. In this embodiment, the first notch 113 is parallel to the sliding direction of the slide rail, and the first short arm 112 is perpendicular to the sliding direction of the slide rail. The first oblique arm 111 is inclined from the other end of the first notch 113 toward the direction of the first short arm 112, that is, the closing direction of the slide rail until the end of the first oblique arm 111 is approximately parallel to the sliding direction of the slide rail. And the first oblique arm 111 should be long enough to exceed the position of the first short arm 112 so that the lock pin 21 can slide along the first oblique arm 111 to the position in the first notch 113 where it is caught by the first short arm 112 when contacting the middle inner rail rear locking device 11.

[0053] Figure 3 for Figure 1 The enlarged schematic diagram of part B in FIG. Figure 3As shown, the middle outer rail rear locking device 31 includes a second oblique arm 311, a second short arm 312, and a second notch 313 surrounded by the second oblique arm 311 and the second short arm 312. The middle outer rail rear locking device 31 has the same structure as the middle inner rail rear locking device 11, but the two are symmetrical with respect to the sliding direction of the slide rail, that is, if the first oblique arm 111 and the first short arm 112 extend in the first direction to form the first notch 113, then the second oblique arm 311 and the second short arm 312 extend in the second direction to form the second notch 313, and the first direction and the second direction are 180 degrees and are both perpendicular to the sliding direction of the slide rail. The extension direction of the end of the first oblique arm 111 is the same as the extension direction of the end of the second oblique arm 311, and both are facing the closing direction of the slide rail.

[0054] The end of the first oblique arm 111 is tangent to the straight line where the edge of the second notch 313 is located. The straight line where the edge of the first notch 113 is located is tangent to the straight line where the second oblique arm 311 is located. Such a setting allows the lock pin 21 to be guided by the first oblique arm 111 or the second oblique arm 311 to change its position when sliding between the middle inner rail rear locking device 11 and the middle outer rail rear locking device 31. Then, when the position of the lock pin 21 changes, the locking state between the inner rail 1 and the middle rail 2, and the locking state between the middle rail 2 and the outer rail 3 can be changed at the same time.

[0055] Figure 4 for Figure 1 The enlarged schematic diagram of part C in FIG. Figure 4 As shown, a sliding track 22 is provided on the middle rail 2. A lock pin 21 passes through the sliding track 22 and can slide in the sliding track 22, and two ends of the lock pin 21 are respectively exposed from two sides of the middle rail 2. The first end of the lock pin 21 is used to extend into the middle outer rail rear locking device 31 and slide in the middle outer rail rear locking device 31. The second end of the lock pin 21 is used to extend into the middle inner rail rear locking device 11 and slide in the middle inner rail rear locking device 11.

[0056] like Figure 4 As shown, the slide rail rear locking device also includes a torsion spring 23 fixed on the middle rail 2. Figure 5 Schematic diagram of the structure of the torsion spring in the embodiment of the present invention. Figure 4 , Figure 5As shown, the torsion spring 23 includes a first fixed arm 231, a second fixed arm 232, a first curved arm 233 and a second curved arm 234. The first fixed arm 231 and the second fixed arm 232 fix the torsion spring 23 to the middle rail 2. The common end of the first curved arm 233 and the second curved arm 234 forms an elastic protruding angle 235, and the protruding angle 235 overlaps with at least a part of the sliding track 22, that is, the protruding angle 235 covers at least a part of the sliding track 22, but preferably does not cover the entire sliding track 22. When the locking pin 21 slides in the sliding track 22, due to the elasticity of the torsion spring 23, when the protruding angle 235 is pressed down, the locking pin 21 can move between the first curved arm 233 and the second curved arm 234, and after the protruding angle 235 is reset, the locking pin 21 can be stuck in the range of the first curved arm 233 or the range of the second curved arm 234.

[0057] Furthermore, a rotatable sleeve 24 is provided on the outer side of the lock pin 21. The lock pin 21 slides relative to the torsion spring 23 through the sleeve 24, that is, when the lock pin 21 moves, the sleeve 24 rotates and contacts the first curved arm 233, the second curved arm 234 or the raised corner 235. Since the sleeve 24 is rotatable, the movement process of the lock pin 21 can be smoother.

[0058] The following Figure 6 to Figure 12 The working method of the sequential motion slide rail assembly in the embodiment of the present invention is shown.

[0059] Figure 6 This is a schematic diagram of the fully closed state of the slide rails in the embodiment of the present invention. At this time, the inner rail 1, the middle rail 2 and the outer rail 3 are completely overlapped. At this time, the lock pin 21 is stuck in the middle inner rail rear lock device 11, and the inner rail 1 and the middle rail 2 are in a locked state. Specifically, in combination with Figure 4 The locking pin 21 slides to the first position of the sliding track 22 and is surrounded by the protruding corner 235 of the torsion spring 23 and the first notch 113 of the middle inner rail rear locking device 11 and is in a relatively stable state.

[0060] Figure 7 This is a schematic diagram of the first pulled-out state of the slide rail according to an embodiment of the present invention. Figure 6 The fully closed state shown Figure 7 During the first pulling-out state shown, the locking pin 21 is caught by the first short arm 112, so that the middle rail 2 and the inner rail 1 are locked and move together. The middle rail 2 and the inner rail 1 are pulled out simultaneously until the locking pin 21 contacts the locking device 31 of the middle and outer rails.

[0061] Figure 8 It is an enlarged schematic diagram of the rear locking device of the slide rail in the first pulled-out state of the slide rail in an embodiment of the invention. Figure 8 That is Figure 7 The enlarged schematic diagram of the middle D portion. In the first pulled-out state, the locking pin 21 begins to contact the second oblique arm 311 of the rear locking device 31 of the middle outer rail.

[0062] Fig. 9 It is an enlarged schematic diagram of the rear locking device of the slide rail in the intermediate process of the slide rail changing from the first pulled-out state to the second pulled-out state in an embodiment of the present invention. Fig.10 It is an enlarged schematic diagram of the rear locking device of the slide rail in the second extended state of the slide rail according to the embodiment of the present invention. Fig. 9 and Fig.10 The location shown is also Figure 7 The position of the D part in the figure is different from that of the slide rail. Fig. 9 , Fig.10 As shown, after the locking pin 21 contacts the middle outer rail rear locking device 31, as the slide rail moves, the locking pin 21 stuck in the middle inner rail rear locking device 11 slides from the middle inner rail rear locking device 11 to the middle outer rail rear locking device 31 and gets stuck, the inner rail 1 is unlocked from the middle rail 2, and the middle rail 2 is locked with the outer rail 3.

[0063] Specifically, after the lock pin 21 touches the second oblique arm 311 on the middle outer rail rear locking device 31, the lock pin 21 slides along with the second oblique arm 311, and the interference between the first oblique arm 111 on the middle inner rail rear locking device 11 and the lock pin 21 gradually decreases until they are completely separated.

[0064] like Fig. 9 As shown, during the sliding process of the lock pin 21 along with the second inclined arm 311, since the torsion spring 23 is elastic, the shaft sleeve 24 sleeved on the lock pin 21 rotates at the same time, so that the lock pin 21 presses down the raised corner 235 from the second bent arm 234 of the torsion spring 23 and passes over the raised corner 235. During this process, the torsion spring 23 slowly undergoes elastic deformation. When the slide rail continues to be pulled out, the lock pin 21 enters the range of the first bent arm 232 of the torsion spring 23. Fig.10 As shown, under the action of the second inclined arm 311 and the restoring force of the torsion spring 23, the locking pin 21 gradually slides into the second notch 313 of the middle and outer rail rear locking device 31, and the second short arm 312 clamps the locking pin 21. At the same time, the locking pin 21 also slides into the range of the first curved arm 233. At this time, the middle rail 2 is locked with the outer rail 3, and the inner rail 1 has been separated from the middle rail 2.

[0065] Fig.11 It is an enlarged schematic diagram of the rear locking device of the slide rail in the intermediate process of the slide rail being transferred from the second extended state to the fully extended state in an embodiment of the present invention. Fig.11 The location shown is also Figure 7 The position of the D part in the figure is changed again. Fig.11 As shown, at this time, the middle rail 2 and the outer rail 3 have been locked, the inner rail 1 and the middle rail 2 are separated by a distance, and the inner rail 1 is pulled out alone until it is pulled out to the fully pulled out state of the slide rail.

[0066] Fig.12 This is a schematic diagram of a state where the slide rail is fully pulled out in an embodiment of the present invention. Fig.12 The truncation symbol is used to omit the structure of part of the outer rail 3 and part of the structure of the inner rail 1. At this time, the inner rail 1 is pulled out to the maximum distance, and the slide rail is fully pulled out. Fig.13 for Fig.12 An enlarged schematic diagram of part F of Fig.13 The state of the locking pin 21 when the middle rail 2 and the outer rail 3 are locked is shown. Fig.11 , Fig.13 The locking pin 21 is within the range of the first bent arm 233 of the torsion spring 23 and is clamped in the second notch 313 by the second short arm 312. Since the middle inner rail rear locking device 11 and the middle outer rail rear locking device 31 are symmetrical in structure, Fig.13 Similarly, the state of the locking pin 21 when the middle rail 2 and the inner rail 1 are locked can also be understood.

[0067] During the closing process of the slide rail, the state change of the slide rail rear locking device is opposite to that during the opening process of the slide rail. During the closing process of the slide rail, the detailed state change method of the slide rail rear locking device can refer to the opening process of the slide rail, including:

[0068] The slide rail changes from the fully opened state to the second pulled-out state: the inner rail 1 is pushed in until the locking pin 21 contacts the middle inner rail rear locking device 11;

[0069] The slide rail changes from the second pulled-out state to the first pulled-out state: the lock pin 21 stuck in the middle outer rail rear locking device 31 slides from the middle outer rail rear locking device 31 to the middle inner rail rear locking device 11 and is stuck; the middle rail 2 and the outer rail 3 are unlocked, and the middle rail 2 and the inner rail 1 are locked;

[0070] The slide rail changes from the first pulled-out state to the fully closed state of the slide rail: the middle rail 2 and the inner rail 1 are pushed in together until the slide rail is fully closed.

[0071] The rear locking device of the slide rail provided by the present invention, when installed on the slide rail, can enable the slide rail to realize the function of sequential locking during the pulling-out process, that is, from the fully closed state to the first pulled-out state of the slide rail, the middle rail 2 and the inner rail 1 of the slide rail are in a locked state and pulled out together, and when pulled out to a certain extent, as the slide rail moves, the middle rail 2 and the inner rail 1 can be automatically unlocked, and the middle rail 2 and the outer rail 3 can be locked, so that the inner rail 1 can continue to be pulled out until the slide rail is fully pulled out. Similarly, during the advancement process of the slide rail, the inner rail 1 can be pushed in first until the second pulled-out state, and then the outer rail 3 and the middle rail 2 are unlocked, and the inner rail 1 and the middle rail 2 are locked, so that the inner rail 1 and the middle rail 2 can be pushed in together until the slide rail is completely locked. This allows the slide rail to realize a stable pulling-out process and a stable closing process through the function of sequential locking. Moreover, while increasing the stability of the slide rails, the middle rail 2 and the inner rail 1 are stably and safely locked, and the middle rail 2 and the outer rail 3 are stably and safely locked, avoiding the phenomenon of the rails being separated from each other during the slide rail pulling out process.

[0072] Furthermore, an embodiment of the present invention also provides a front locking device for the slide rail, which is used to ensure that the slide rail can be in a stable and fully extended state.

[0073] Fig.14 for Figure 1 Enlarged schematic diagram of part D in the figure. Fig.15 This is a partial structural diagram of the front locking device of the slide rail. Fig.14 and Fig.15 The front locking device of the slide rail includes a front locking device 25 for the middle inner rail, a sliding seat 14, a locking block A12, a locking block B13 and a push rod 15. The front locking device 25 for the middle inner rail is specifically a protrusion facing the direction of the inner rail 1. The sliding seat 14 is arranged in the middle of the inner rail 1, and the position of the sliding seat 14 is closer to the closing direction of the slide rail relative to the position of the rear locking device 31 for the middle outer rail. The locking block B13 can slide relative to the inner rail 1 in the sliding seat 14 in a direction perpendicular to the movement of the slide rail. The front locking device 25 for the middle inner rail is arranged on the middle rail 2, and is located near the opening end of the middle rail 2.

[0074] Specifically, the sliding seat 14 has a slideway perpendicular to the direction in which the slideway moves. The locking block B13 is fixed to the waist-shaped hole of the slideway perpendicular to the direction in which the slideway moves by rivets. The spring piece 18 is fixed to the inner rail 1. The first end of the locking block B13 is an inclined surface, and the edge close to the locking block A12 is higher, and the edge away from the locking block A12 is lower. The spring piece 18 is fixed to the end of the slideway and can contact the second end of the locking block B13.

[0075] Fig.16 for Fig.12 The enlarged schematic diagram of the G part in the figure can be combined with Fig.15 and Fig.16 It is understood that when the slide rail is about to enter the fully pulled-out state, the front locking device 25 of the middle inner rail contacts the inclined surface of the lock block B13, and as the slide rail moves, the front locking device 25 of the middle inner rail pushes the lock block B13 toward one end of the spring sheet 18 to press the spring sheet 18 down, while moving along the inclined surface of the lock block B13 and getting stuck between the lock block A12 and the lock block B13. At this time, the spring sheet 18 resets and pushes the lock block B13 back to its original position along the slide. At this time, the slide rail is in a fully pulled-out state, and the middle rail 2 is locked with the inner rail 1. According to the above, in the fully pulled-out state of the slide rail, the locking pin 21 is stuck in the rear locking device 31 of the middle outer rail, and the middle rail 2 and the outer rail 3 are also locked. That is to say, before the slide rail enters the fully opened state of the slide rail, it also includes the fully locked state of the slide rail: after the front locking device 25 of the middle inner rail contacts the lock block B13 and pushes the lock block B13 away, it gets stuck between the lock block A12 and the lock block B13, so that the middle rail 2 is locked with the inner rail 1. The slide rail can remain stable in the fully extended state.

[0076] Furthermore, the front locking device of the slide rail also includes a push rod 15, a push block 16 and a compression spring 17. The push block 16 is fixed to the inner rail 1 by rivets in a waist-shaped hole parallel to the direction of movement of the slide rail near the opening end, and a compression spring 17 is fixed between the push block 16 and the side wall of the inner rail 1, so that the push block 16 can be pressed down in the closing direction of the slide rail, and the compression spring 17 is compressed at the same time. When the compression spring 17 is reset, the push block 16 can be pushed out and reset in the opening direction of the slide rail. One end of the push rod 15 is fixed to the push block 16, and the second end of the push rod 15 has a push surface. In this embodiment, the push surface of the push rod 15 is approximately parallel to the inclined surface of the lock block B13. Of course, the push surface can also be other suitable shapes. When the push block 16 is pressed, the push rod 15 is pushed, pushing the lock block B13 toward one end of the spring 18, and the spring 18 is pressed down. At this time, the inner rail 1 is pushed, so that the middle inner rail front locking device 25 inserted between the lock block A12 and the lock block B13 can be moved out of the position between the lock block A12 and the lock block B13 from the lock block B13, and the middle rail 2 and the inner rail 1 are unlocked. After that, the spring 18 is reset to push the lock block B13 back to its original position, and the slide rail can continue to close. In other words, when the slide rail is pushed in from the fully open state, it also includes the unlocking process of the middle rail 2 and the inner rail 1: the push rod 15 pushes the lock block B13 so that the middle inner rail front locking device 25 is disengaged from the lock block A12 and the lock block B13, so that the middle rail 2 and the inner rail 1 are unlocked.

[0077] Further, the front locking device of the inner rail can ensure that the slide rail can be stably pulled out and pushed in, and further ensure that the rails can be stably locked even when the slide rail is fully pulled out. This further improves the stability of the slide rail, and at the same time ensures that the rails will not be pulled apart even when the slide rail is fully pulled out.

[0078] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. The present invention may be modified in any form without violating the basic structure of the present invention.

Claims

1. A sequential motion slide rail assembly, characterized in that: The invention comprises a slide rail and a slide rail rear locking device; the slide rail comprises an inner rail (1), a middle rail (2) which can slide relative to the inner rail, and an outer rail (3) which can slide relative to the middle rail; the slide rail rear locking device comprises a middle inner rail rear locking device (11) which is arranged on the inner rail (1) and close to the closed end of the inner rail (1), a locking pin (21) which is arranged on the middle rail (2) and close to the closed end of the middle rail (2), and a middle outer rail rear locking device (31) which is arranged on the outer rail (3) and located in the middle of the outer rail (3); When the slide rail is in a fully closed state or a first pulled-out state, the locking pin (21) is locked in the middle inner rail rear locking device (11) so that the inner rail (1) and the middle rail (2) are locked; During the transition of the slide rail between the first pulled-out state and the second pulled-out state, after the lock pin (21) stuck in the middle inner rail rear locking device (11) contacts the middle outer rail rear locking device (31), it slides from the middle inner rail rear locking device (11) to the middle outer rail rear locking device (31) and gets stuck as the slide rail moves; or, after the lock pin (21) stuck in the middle outer rail rear locking device (31) contacts the middle inner rail rear locking device (11), it slides from the middle outer rail rear locking device (31) to the middle inner rail rear locking device (11) and gets stuck as the slide rail moves; From the second pulled-out state of the slide rail to the fully pulled-out state of the slide rail, the locking pin (21) is stuck in the middle and outer rail rear locking device (31) so that the middle rail (2) and the outer rail (3) are locked.

2. The sequential motion slide rail assembly according to claim 1, characterized in that: The middle inner rail rear locking device (11) comprises a first oblique arm (111), a first short arm (112) and a first notch (113) surrounded by the first oblique arm (111) and the first short arm (112); the middle outer rail rear locking device (31) comprises a second oblique arm (311), a second short arm (312) and a second notch (313) surrounded by the second oblique arm (311) and the second short arm (312); the straight line where the edge of the second notch (313) lies is tangent to the edge of the first oblique arm (111); the straight line where the edge of the first notch (113) lies is tangent to the straight line where the second oblique arm (311) lies; the first short arm (112) and the second short arm (312) both form a predetermined angle with the moving direction of the slide rail so as to clamp the locking pin (21).

3. The sequential motion slide rail assembly according to claim 2, characterized in that: A sliding track (22) is provided on the middle rail (2); the locking pin (21) passes through the sliding track (22), and two ends of the locking pin (21) are respectively exposed from two sides of the middle rail (2); the first end of the locking pin (21) is used to extend into the middle outer rail rear locking device (31) and slide in the middle outer rail rear locking device (31); the second end of the locking pin (21) is used to extend into the middle inner rail rear locking device (11) and slide in the middle inner rail rear locking device (11).

4. The sequential motion slide rail assembly according to claim 3, characterized in that: The slide rail rear locking device also includes a torsion spring (23) fixed to the middle rail (2); the torsion spring (23) includes a first curved arm (233) and a second curved arm (234); a common end of the first curved arm (233) and the second curved arm (234) forms an elastic raised angle (235); the raised angle (235) overlaps with at least a portion of the slide rail (22) and is used to enable the lock pin (21) to move between the first curved arm (233) and the second curved arm (234) and to be stuck in the range of the first curved arm (233) or the range of the second curved arm (234) when sliding in the slide rail (22).

5. The sequential motion slide rail assembly according to claim 4, characterized in that: A rotatable shaft sleeve (24) is arranged outside the locking pin (21), and the locking pin (21) moves relative to the torsion spring (23) via the shaft sleeve (24).

6. The sequential motion slide rail assembly according to claim 1, characterized in that: The sequential motion slide rail assembly further comprises a slide rail front locking device; the slide rail front locking device comprises a middle inner rail front locking device (25) arranged on the middle rail (2) and close to the open end of the middle rail (2), a locking block A (12) arranged in the middle of the inner rail (1), and a locking block B (13) arranged in the middle of the inner rail (1) and capable of sliding relative to the inner rail (1) in a direction perpendicular to the movement of the slide rail; When the slide rail is fully extended, the middle inner rail front locking device (25) contacts the locking block B (13) and can be inserted between the locking block A (12) and the locking block B (13) after the locking block B (13) is pushed away, so that the middle rail (2) and the inner rail (1) are locked.

7. The sequential motion slide rail assembly according to claim 6, characterized in that: The slide rail front locking device comprises a push rod (15) and a push block (16); one end of the push rod (15) is fixed to the push block (16), and the other end of the push rod (15) is provided with a push surface for pushing the lock block B (13) so that the middle inner rail front locking device (25) is disengaged from between the lock block A (12) and the lock block B (13), so that the middle rail (2) and the inner rail (1) are unlocked.

8. The sequential motion slide rail assembly according to claim 6, characterized in that: The slide rail front locking device comprises a sliding seat (14); the locking block B (13) can slide in the slideway of the sliding seat (14); the middle inner rail front locking device (25) can contact and push the locking block B (13) from the first end of the slideway; and a spring sheet (18) is arranged at the second end of the slideway.

9. A method for operating a sequential motion slide rail assembly implemented by the sequential motion slide rail assembly according to any one of claims 1 to 8, characterized in that: The method comprises an opening step and a closing step of the slide rail; the opening step of the slide rail comprises: When the slide rail is in a fully closed state, the locking pin (21) is locked in the middle inner rail rear locking device (11) so that the inner rail (1) and the middle rail (2) are locked; The slide rail changes from a fully closed state to a first pulled-out state: the middle rail (2) and the inner rail (1) are pulled out simultaneously until the locking pin (21) contacts the middle and outer rail rear locking device (31); The slide rail changes from the first pulled-out state to the second pulled-out state: the lock pin (21) stuck in the middle inner rail rear locking device (11) slides from the middle inner rail rear locking device (11) to the middle outer rail rear locking device (31) and is stuck, the inner rail (1) is unlocked from the middle rail (2), and the middle rail (2) is locked from the outer rail (3); The slide rail changes from the second pulled-out state to the slide rail fully opened state: the inner rail (1) is continuously pulled out until the slide rail is fully opened; The closing step of the slide rail comprises: The slide rail is transformed from a fully open state to a second pulled-out state: the inner rail (1) is pushed in until the locking pin (21) contacts the middle inner rail rear locking device (11); The slide rail changes from the second pulled-out state to the first pulled-out state: the lock pin (21) stuck in the middle outer rail rear locking device (31) slides from the middle outer rail rear locking device (31) to the middle inner rail rear locking device (11) and is stuck; the middle rail (2) and the outer rail (3) are unlocked, and the middle rail (2) and the inner rail (1) are locked; The slide rail changes from a first pulled-out state to a fully closed state: the middle rail (2) and the inner rail (1) are pushed in together until the slide rail is fully closed.

10. The method for operating the sequential motion slide rail assembly according to claim 9, characterized in that: Before the slide rail enters the fully open state, it also includes a fully locked state: after the front locking device (25) of the middle inner rail contacts the locking block B (13) and pushes the locking block B (13), it is inserted between the locking block A (12) and the locking block B (13), so that the middle rail (2) and the inner rail (1) are locked; When the slide rail is pushed in from the fully open state, it also includes an unlocking process of the middle rail (2) and the inner rail (1): the push rod (15) pushes the locking block B (13) so that the middle inner rail front locking device (25) is disengaged from between the locking block A (12) and the locking block B (13), so that the middle rail (2) and the inner rail (1) are unlocked.

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