Drawer guide rail device with double functions of interlocking and buffering

Abstract

The utility model provides a drawer guide rail device with double functions of interlocking and buffering, which comprises an interlocking device and a transmission rod, the interlocking device is arranged at the front end of a fixed rail of a guide rail, a buffering device is arranged at the rear end of the fixed rail of the guide rail, the structure distribution is reasonable and compact through the structural matching of the interlocking device and the buffering device, and under the action of interlocking, the drawer can be prevented from being damaged. When the drawer is closed, only one layer of drawer can be pulled out at a time, the guide rail interlocking function between the layers is achieved, meanwhile, each layer of drawer can be slowly and automatically closed when closed, huge impact sound generated between the drawer and the cabinet body is avoided, and the practicability and reliability of the product are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of guide rails, in particular to a drawer guide rail device with dual functions of interlocking and buffering. Background Art

[0002] The patent application number of the prior application of the applicant is: CN202311439077, which includes an interlocking mechanism for locking or unlocking a linkage of multiple upper and lower distributed guide rail assemblies. The guide rail assembly includes an inner rail, a middle rail, and an outer rail that are slidably connected to each other. An inner ball nest assembly and an outer ball nest assembly are respectively slidably connected between the middle rail and the inner rail and the outer rail. The interlocking mechanism includes a front-end interlocking assembly. Through the structural cooperation of the front lock fixing seat, the front lock insert block, the front lock clamping block, and the linkage connecting rod of the front-end interlocking assembly, not only can only one drawer be pulled out at a time under the interlocking effect to realize the interlocking function between the guide rail assemblies, but also the front-end assembly is adopted at the front end of the guide rail assembly to solve the assembly difficulty problem, improve the structural reliability, and ensure the interlocking effect.

[0003] However, the guide rail interlocking device with the above structure has the following deficiencies in actual application:

[0004] It does not have an automatic closing function. Especially for drawers with a large load, it is troublesome and laborious to operate when closing.

[0005] It does not have a buffering function, and it is easy to generate a large impact sound between the drawer and the cabinet body when closing, damaging the product.

[0006] The installation position cannot be adjusted, and it is difficult to overcome the installation errors generated during product processing or assembly, affecting the normal assembly and use of the product. Summary of the Utility Model

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a drawer guide rail device with dual functions of interlocking and buffering, which has a simple structure and is convenient for assembly, enables the drawers to have an interlocking function while the drawers slowly close automatically, and also has the function of adjusting the installation position, strengthening the structural stability and operation smoothness.

[0008] The invention purpose of the utility model is realized as follows: A drawer guide rail device with dual functions of interlocking and buffering includes guide rails distributed on each layer of drawers, an interlocking device installed on each layer of guide rails, and a transmission rod for driving the interlocking device to act to open or close the corresponding guide rails. Among them, the interlocking device is installed at the front end of the fixed rail of the guide rail, and both ends of the transmission rod are respectively fitted and connected with the corresponding interlocking devices and drive the front lock block of the interlocking device to slide up and down, so that the front lock block of the corresponding interlocking device opens or closes the front end of the fixed rail of the corresponding guide rail.

[0009] A buffer device is provided at the rear end of the fixed rail of the guide rail, and the buffer device includes a buffer base, a buffer slider, a damper, a spring, and a rotating arm. The buffer base is installed at the rear end of the fixed rail of the guide rail, the buffer slider is slidably connected to the buffer base, the damper is installed on the buffer base, the push rod of the damper is connected to the buffer slider, the spring is distributed on both sides of the damper and its two elastic ends are respectively buckled on the buffer base and the buffer slider, the positioning end shaft of the rotating arm is connected to the buffer slider, the swing end of the rotating arm is swingably connected to the bottom surface of the buffer slider and can be slidably connected to the buffer base, and the rear end of the movable rail of the guide rail is installed with a toggle block that is buckled or separated from the rotating arm as it slides.

[0010] According to the above optimization, the interlocking device includes a front locking block and a front end locking seat. The front end locking seat is installed on the fixed rail of the guide rail and forms a directional groove with the fixed rail of the guide rail for the front locking block to slide into to prevent the movable rail of the guide rail from opening outward or for the front locking block to slide away to facilitate the movable rail of the guide rail to open outward. The front locking blocks are respectively installed at both ends of the transmission rod and can slide up and down on the corresponding directional grooves through the linkage of the transmission rod.

[0011] According to the above optimization, the interlocking device also includes a front card block, which is installed at the front end of the movable rail and slides with the movable rail to contact the front locking block or push the front locking block open and slide outward through the front end locking seat.

[0012] According to the above optimization, the buffer base includes a buffer fixing part and a buffer guide part, the buffer fixing part is clamped on the rear end of the fixed rail of the guide rail, the buffer guide part is integrally formed at the front end of the buffer fixing part and is clamped on the fixed rail of the guide rail, the buffer slider is slid back and forth on the buffer guide part, and the buffer guide part is provided with a guide groove for the rotating arm to slide and can swing to engage or separate with the toggle block.

[0013] According to the above optimization, a fixed clamping position is provided in the middle of the buffer fixing part for buckling the adapter damper, and fixed grooves are provided on both sides of the buffer fixing part for placing the adapter spring, and the end of the fixed groove is provided with a fixed clamping groove for clamping with an elastic end of the spring; the rear part of the guide groove is provided with an elastic arm that is deformed under the action of external force so that the rotating arm can be matched with the toggle block when it is at the initial point.

[0014] According to the above optimization, the buffer guide portion is provided with a clamping point for the rotating arm to automatically clamp into the toggle block and an initial point for the rotating arm to be clamped with the toggle block under the action of external force, and the clamping point and the initial point are distributed at the front and rear of the guide groove.

[0015] Optimized according to the above, a swing clearance groove for the rotating arm to move along to reach the clamping point or the initial point is provided in the middle of the buffer slider. A buffer elastic block for buffering is provided at the front end of the buffer slider. A clamping position for clamping the push rod of the damper and fixed clamping grooves distributed on both sides of the clamping position and for clamping the other elastic end of the spring are provided at the rear end of the buffer slider.

[0016] Optimized according to the above, the fixed rail of the guide rail is provided with adjusting pads for adjusting the front and rear installation positions. The adjusting pads are fitted and clamped on the fixed rail of the guide rail, and adjusting long holes for installing on the cabinet body are opened in the adjusting pads.

[0017] Optimized according to the above, an adjusting convex block and a buckle are provided on one side of the adjusting pad. The adjusting convex block is arranged up and down on the adjusting pad, and the buckles are distributed on the side of the adjusting pad. The fixed rail of the guide rail is provided with a U-shaped groove. The adjusting convex blocks distributed up and down are respectively fitted and slid in the horizontal groove part of the U-shaped groove, and a clamping position for mating and clamping with the buckle is formed between the side groove position of the U-shaped groove and the side of the adjusting long hole.

[0018] Optimized according to the above, the guide rail includes a fixed rail, a middle rail, and a movable rail that are slidably connected to each other. Outer ball nests and inner ball nests are provided between the middle rail and the fixed rail and the movable rail. Front stoppers and rubber stoppers for restricting the moving position of the movable rail are respectively installed at the front end of the middle rail and the rear end of the movable rail. The inner ball nest slides between the front stopper and the rubber stopper. A front limiting convex block is provided at the front end of the fixed rail, and a rear limiting convex block is provided at the rear end of the middle rail. The outer ball nest slides between the front limiting convex block and the rear limiting convex block.

[0019] The advantages of the present utility model are as follows:

[0020] 1) An interlocking device and a buffer device are respectively assembled at the front end and the rear end of the guide rail. The structure is reasonably and compactly distributed. Under the interlocking action, only one layer of the drawer can be pulled out at a time, realizing the interlocking function of the guide rails between layers. At the same time, each layer of the drawer can slowly close itself when closed, avoiding a huge impact sound between the drawer and the cabinet body, and improving the practicability and reliability of the product.

[0021] 2) Matching with the structure of the adjusting pad, the assembled screws can be adjusted left and right in the adjusting long hole, so as to realize the adjustment of the left and right assembly positions of the guide rail, overcome the installation errors generated during product processing or assembly, and enhance the structural stability and operation smoothness. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the first layer of the drawer being opened in the preferred embodiment of the present utility model.

[0023] Figure 2 It is a schematic structural diagram of the second layer of the drawer being opened in the preferred embodiment of the present utility model.

[0024] Figure 3 This is a schematic structural view of the third - layer drawer of the preferred embodiment of the present utility model when it is opened.

[0025] Figure 4 This is a schematic structural view of the preferred embodiment of the present utility model.

[0026] Figure 5 This is a schematic structural view of another angle of the preferred embodiment of the present utility model.

[0027] Figure 6 This is a partial exploded view of the preferred embodiment of the present utility model.

[0028] Figure 7 This is a partial exploded view of another angle of the preferred embodiment of the present utility model.

[0029] Figure 8 This is an exploded view of the preferred embodiment of the present utility model. Detailed implementation manners

[0030] The present utility model will be further described below with reference to the accompanying drawings.

[0031] According to Figures 1 to 8 As shown, the drawer guide rail device with double functions of interlocking and buffering of the present utility model includes guide rails 1 distributed on each layer of the drawer, an interlocking device 2 installed on each layer of the guide rail 1, and a transmission rod 3 for driving the interlocking device 2 to act to open or close the corresponding guide rail 1. Among them, the interlocking device 2 is installed at the front end of the fixed rail 11 of the guide rail 1, and both ends of the transmission rod 3 are respectively matched and installed with the corresponding interlocking device 2, and the front lock block 21 of the interlocking device 2 is slid up and down, so that the front lock block 21 of the corresponding interlocking device 2 opens or closes the front end of the fixed rail 11 of the corresponding guide rail 1.

[0032] Referring to Figures 1 to 8 As shown, for further refinement, the interlocking device 2 includes a front lock block 21 and a front end lock seat 22. The front end lock seat 22 is installed on the fixed rail 11 of the guide rail 1 and forms a directional groove 6 with the fixed rail 11 of the guide rail 1 for the front lock block 21 to slide into to block the outward opening of the movable rail 13 of the guide rail 1 or for the front lock block 21 to slide away to facilitate the outward opening of the movable rail 13 of the guide rail 1. The front lock blocks 21 are respectively installed at both ends of the transmission rod 3 and can slide up and down on the corresponding directional groove 6 through the linkage of the transmission rod 3.

[0033] Moreover, the guide rail 1 includes a fixed rail 11, a middle rail 12, and a movable rail 13 that are slidably connected to each other. Outer bead nests 14 and inner bead nests 15 are provided between the middle rail 12 and the fixed rail 11 and the movable rail 13. A front stopper 16 and a rubber pusher 17 for restricting the moving position of the movable rail 13 are respectively installed at the front end of the middle rail 12 and the rear end of the movable rail 13. The inner bead nest 15 slides between the front stopper 16 and the rubber pusher 17. A front limiting projection 18 is provided at the front end of the fixed rail 11, and a rear limiting projection 19 is provided at the rear end of the middle rail 12. The outer bead nest 14 slides between the front limiting projection 18 and the rear limiting projection 19.

[0034] In practical applications, the interlocking device 2 further includes a front latch 23. The front latch 23 is installed at the front end of the movable rail 13 and slides with the movable rail 13 to contact or push open the front locking block 21 and slide outwards through the front end locking seat 22.

[0035] During use, in the initial state of each layer of drawers, for the guide rail 1 of the upper-level drawer, its front locking block 21 slides downwards under its own weight on the guiding groove 6, and under the driving action of the transmission rod 3, it prompts the front locking block 21 of the lower-level guide rail 1 to also move downwards to lock on the front end locking seat 22 of the lower-level guide rail 1, so as to block the outward sliding of the movable rail 13 of the lower-level guide rail 1. In this way, the first-layer drawer at the upper part can be opened outwards, and the second and third-layer drawers of other lower layers are locked.

[0036] When pulling out one of the lower drawers, under the action of an external force, the front latch 23 at the lower level pushes the corresponding front locking block 21 upwards to achieve unlocking, and prompts the movable rail 13 of the lower-level guide rail 1 to be smoothly opened outwards. At this time, since the lower front locking block 21 is pushed and moves upwards along the guiding groove 6, under the driving force of the transmission rod 3, it pushes the upper front latch 23 to move upwards along the guiding groove 6 of the upper front end locking seat 22, so that the upper front locking block 21 is locked on the upper front end locking seat 22, realizing the locking of the upper-layer drawer. Under the interlocking action of the interlocking device 2, only one layer of drawer can be pulled out at a time, realizing the interlocking function of the guide rails 1 between layers.

[0037] Moreover, the interlocking device 2 of this structure is arranged at the front end of the guide rail 1, and the structure is reasonably distributed, ensuring that the inner bead nest 15 assembly and the outer bead nest 14 assembly can freely roll between the movable rail 13, the middle rail 12, and the fixed rail 11, facilitating assembly, improving the structural reliability, and ensuring the interlocking function.

[0038] Refer to Figures 1 to 8As shown, a buffer device 4 is provided at the rear end of the fixed rail 11 of the guide rail 1. The buffer device 4 includes a buffer base 41, a buffer slider 42, a damper 43, a spring 44, and a rotating arm 45. The buffer base 41 is installed at the rear end of the fixed rail 11 of the guide rail 1, and the buffer slider 42 is slidably connected to the buffer base 41. The damper 43 is installed on the buffer base 41, and the push rod of the damper 43 is connected to the buffer slider 42. The spring 44 is distributed on both sides of the damper 43, and its two elastic ends are respectively buckled on the buffer base 41 and the buffer slider 42. The positioning end of the rotating arm 45 is pivotally connected to the buffer slider 42, and the swinging end of the rotating arm 45 is swingably connected to the bottom surface of the buffer slider 42 and can be slidably connected to the buffer base 41. A toggle block 5 that is matched and buckled or separated from the rotating arm 45 as it slides is installed at the rear end of the movable rail 13 of the guide rail 1.

[0039] Among them, the buffer base 41 includes a buffer fixing part 411 and a buffer guiding part 412. The buffer fixing part 411 is clamped at the rear end of the fixed rail 11 of the guide rail 1, and the buffer guiding part 412 is integrally formed at the front end of the buffer fixing part 411 and is clamped on the fixed rail 11 of the guide rail 1. The buffer slider 42 slides back and forth on the buffer guiding part 412, and the buffer guiding part 412 is provided with a guiding groove 413 for the rotating arm 45 to slide and swing and be engaged or separated from the toggle block 5.

[0040] In practical applications, a fixing position 47 for fitting and installing the damper 43 is provided in the middle of the buffer fixing part 411. Fixed slots for fitting the springs 44 are respectively provided on both sides of the buffer fixing part 411, and fixing card slots 48 for clamping one elastic end of the spring 44 are provided at the ends of the fixed slots. An elastic arm 49 for deforming under an external force to enable the rotating arm 45 to be engaged with the toggle block 5 when the rotating arm 45 is at the initial point is provided at the rear part of the guiding groove 413.

[0041] In this way, using the springs 44 on both sides of the buffer base 41 can ensure balanced force and achieve the self-closing function. The damper 43 of this structure uses an oil cylinder to play a damping role, enabling the drawer to close slowly and avoiding a huge impact sound between the drawer and the cabinet body.

[0042] Refer to Figures 1 to 8 As shown, for further refinement, the buffer guiding part 412 is provided with a clamping point for the rotating arm 45 to automatically snap into the toggle block 5 and an initial point for the rotating arm 45 to be engaged with the toggle block 5 under an external force. The clamping point and the initial point are distributed at the front and rear parts of the guiding groove 413.

[0043] In addition, a swinging clearance groove is provided in the middle of the buffer slider 42 for the rotating arm 45 to move to a clamping point or an initial point. A buffer elastic block 46 is provided at the front end of the buffer slider 42 for buffering, and a clamping position 410 for clamping with the push rod of the damper 43 and a fixed clamping groove 48 distributed on both sides of the clamping position 410 and clamped with the other elastic end of the spring 44 are provided at the rear end of the buffer slider 42.

[0044] When the drawer is closed, when the rotating arm 45 moves to the clamping point along the guide groove 413 with the buffer slider 42, when the movable rail 13 moves to this point, the rotating arm 45 automatically snaps into the toggle block 5. When the rotating arm 45 moves to the initial point along the guide groove 413 with the buffer slider 42, when the movable rail 13 moves to this point, the rotating arm 45 cannot automatically snap into the toggle block 5, and the inner rail is pushed hard, and the elastic arm 49 on the buffer base 41 is deformed, and the rotating arm 45 snaps into the toggle block 5. Then, under the action of external force, the toggle block 5 drives the rotating arm 45 to slide freely in the guide groove 413, the rotating arm 45 drives the buffer slider 42 to move freely, and the buffer slider 42 drives the damper 43 and the spring 44 to move freely, so as to realize the buffer self-closing function.

[0045] Reference Figures 1 to 8 As shown, the fixed rail 11 of the guide rail 1 is provided with an adjustment pad 7 which can adjust the front and rear installation positions. The adjustment pad 7 is adapted to be mounted on the fixed rail 11 of the guide rail 1, and the adjustment pad 7 is provided with an adjustment long hole 8 for installation on the cabinet.

[0046] With the structure of the adjusting pad 7, the assembly screw can be adjusted left and right in the adjusting long hole 8, so as to adjust the left and right assembly position of the guide rail 1, overcome the installation error caused by product processing or assembly, and enhance the structural stability and smooth operation.

[0047] Moreover, one side of the adjustment pad 7 is provided with an adjustment protrusion 71 and a buckle 72. The adjustment protrusion 71 is provided on the adjustment pad 7 from top to bottom, and the buckle 72 is distributed on the side of the adjustment pad 7. The fixed rail 11 of the guide rail 1 is provided with a U-shaped groove 111, and the adjustment protrusions 71 distributed from top to bottom are respectively adapted to slide on the transverse groove part of the U-shaped groove 111, and the side groove position of the U-shaped groove 111 and the side edge of the adjustment long hole 8 form a buckle position 73 matched with the buckle 72.

[0048] The adjustment pad 7 of this structure cooperates with the structure of the fixed rail 11 of the guide rail 1, which facilitates assembly, reduces the use of screws, improves structural stability, and can adjust the installation position of the guide rail 1 to ensure the use effect of the product.

[0049] The above specific embodiments are only the specific embodiments with better effects of the present utility model. Any structure that is the same as or equivalent to the drawer guide device with the dual functions of interlocking and buffering of the present utility model is within the protection scope of the present utility model.

Claims

1. A drawer guide device with dual functions of interlocking and buffering, comprising guides (1) distributed on each layer of drawers, an interlocking device (2) installed on each layer of guides (1), and a transmission rod (3) for driving the interlocking device (2) to act so as to open or close the corresponding guide (1), characterized in that: The interlocking device (2) is mounted on the front end of the fixed rail (11) of the guide rail (1), and the two ends of the transmission rod (3) are respectively matched with the corresponding interlocking device (2) and are linked with the front locking block (21) of the interlocking device (2) to slide up and down, so that the front locking block (21) of the corresponding interlocking device (2) opens or closes the front end of the fixed rail (11) of the corresponding guide rail (1); A buffer device (4) is provided at the rear end of the fixed rail (11) of the guide rail (1), the buffer device (4) comprising a buffer base (41), a buffer slider (42), a damper (43), a spring (44), and a rotating arm (45), the buffer base (41) being mounted at the rear end of the fixed rail (11) of the guide rail (1), the buffer slider (42) being slidably connected to the buffer base (41), the damper (43) being mounted on the buffer base (41), and a push rod of the damper (43) being connected to the buffer slider. (42), the spring (44) is distributed on both sides of the damper (43) and its two elastic ends are respectively buckled on the buffer base (41) and the buffer slider (42), the positioning end of the rotating arm (45) is axially connected to the buffer slider (42), the swing end of the rotating arm (45) is swingably connected to the bottom surface of the buffer slider (42) and can be slidably connected to the buffer base (41), and the rear end of the movable rail (13) of the guide rail (1) is installed with a toggle block (5) that is buckled or separated from the rotating arm (45) as it slides.

2. The drawer guide device with dual functions of interlocking and buffering according to claim 1, characterized in that: The interlocking device (2) comprises a front locking block (21) and a front locking seat (22); the front locking seat (22) is mounted on the fixed rail (11) of the guide rail (1) and forms a directional groove (6) with the fixed rail (11) of the guide rail (1) for the front locking block (21) to slide into to prevent the movable rail (13) of the guide rail (1) from opening outwards or for the front locking block (21) to slide away to facilitate the movable rail (13) of the guide rail (1) to open outwards; the front locking block (21) is respectively mounted on both ends of the transmission rod (3) and can slide up and down on the corresponding directional groove (6) through the linkage of the transmission rod (3).

3. The drawer guide device with the dual functions of interlocking and buffering according to claim 2, characterized in that: The interlocking device (2) further comprises a front clamping block (23), which is mounted at the front end of the movable rail (13) and slides along with the movable rail (13) to contact with the front locking block (21) or push open the front locking block (21) and slide outward through the front locking seat (22).

4. The drawer guide device with the dual functions of interlocking and buffering according to claim 1, wherein: The buffer base (41) comprises a buffer fixing portion (411) and a buffer guide portion (412); the buffer fixing portion (411) is clamped on the rear end of the fixed rail (11) of the guide rail (1); the buffer guide portion (412) is integrally formed at the front end of the buffer fixing portion (411) and is clamped on the fixed rail (11) of the guide rail (1); the buffer sliding block (42) is slidably mounted on the buffer guide portion (412) in a front-rear manner; the buffer guide portion (412) is provided with a guide groove (413) for the rotating arm (45) to slide and can swing to engage or separate with the toggle block (5).

5. The drawer guide device with the dual functions of interlocking and buffering according to claim 4, characterized in that: A fixed snap-in position (47) for snapping the adaptor damper (43) is provided in the middle of the buffer fixed portion (411), and fixed slots for placing the adaptor spring (44) are provided on both sides of the buffer fixed portion (411), and the ends of the fixed slots are provided with fixed snap-in slots (48) for snapping with an elastic end of the spring (44); and an elastic arm (49) is provided at the rear of the guide slot (413) for deforming under the action of an external force so as to snap-in with the toggle block (5) when the rotating arm (45) is at an initial point.

6. The drawer guide device with the dual functions of interlocking and buffering according to claim 4, characterized in that: The buffer guide portion (412) is provided with a clamping point for the rotating arm (45) to automatically clamp into the toggle block (5) and an initial point for the rotating arm (45) to be matched and clamped with the toggle block (5) under the action of an external force, and the clamping point and the initial point are distributed at the front and rear of the guide groove (413).

7. The drawer guide device with the dual functions of interlocking and buffering according to claim 4, characterized in that: The middle portion of the buffer slider (42) is provided with a swing clearance groove for the rotating arm (45) to be at a clamping point or an initial point as it moves, the front end of the buffer slider (42) is provided with a buffer elastic block (46) for buffering, and the rear end of the buffer slider (42) is provided with a clamping position (410) for clamping with a push rod of a damper (43) and fixed clamping grooves (48) distributed on both sides of the clamping position (410) and for clamping with the other elastic end of the spring (44).

8. The drawer guide device with the dual functions of interlocking and buffering according to claim 1, characterized in that: The fixed rail (11) of the guide rail (1) is provided with an adjustment pad (7) capable of adjusting the front and rear installation positions; the adjustment pad (7) is adapted to be mounted on the fixed rail (11) of the guide rail (1); and the adjustment pad (7) is provided with an adjustment slot (8) for mounting on a cabinet.

9. The drawer guide device with double functions of interlocking and buffering according to claim 8, characterized in that: An adjusting protrusion (71) and a buckle (72) are provided on one side of the adjusting pad (7); the adjusting protrusion (71) is provided on the upper and lower sides of the adjusting pad (7); the buckle (72) is distributed on the side edge of the adjusting pad (7); a fixed rail (11) of the guide rail (1) is provided with a U-shaped groove (111); the adjusting protrusions (71) distributed on the upper and lower sides are respectively adapted to be slidably mounted on the transverse groove portion of the U-shaped groove (111); and the side groove position of the U-shaped groove (111) and the side edge of the adjusting long hole (8) form a buckle position (73) matched with the buckle (72) and buckled.

10. The drawer guide device with the dual functions of interlocking and buffering according to claim 1, characterized in that: The guide rail (1) comprises a fixed rail (11), a middle rail (12) and a movable rail (13) which are slidably connected to each other. An outer bead nest (14) and an inner bead nest (15) are provided between the middle rail (12) and the fixed rail (11) and the movable rail (13). A front stopper (16) and a pusher (17) for limiting the moving position of the movable rail (13) are respectively installed at the front end of the middle rail (12) and the rear end of the movable rail (13). The inner bead nest (15) slides between the front stopper (16) and the pusher (17). A front limiting protrusion (18) is provided at the front end of the fixed rail (11), and a rear limiting protrusion (19) is provided at the rear end of the middle rail (12). The outer bead nest (14) slides between the front limiting protrusion (18) and the rear limiting protrusion (19).

Images