Long-stroke synchronous rail

Abstract

The application provides a long-stroke synchronous track which can maximize the moving distance of the movable track, so as to completely pull out the drawer, and is convenient for disassembly, maintenance and taking and placing of articles; the long-stroke synchronous track comprises two groups of slide rail assemblies which are oppositely arranged, each group of slide rail assemblies comprises a fixed track, a movable track and a middle track which bridges the fixed track and the movable track, a rack shell is sleeved outside the fixed track, a gear of the rack shell is engaged with a gear wheel, the gear wheels in the two groups of slide rail assemblies are connected through a synchronous rod, the gear wheel is installed on the middle track, a traction transmission mechanism is installed on the middle track, the movable track is connected with the traction transmission mechanism, and the movable track and the middle track can make synchronous and same-direction pushing and pulling movement under the traction of the traction transmission mechanism.

Description

Technical Field

[0001] This invention relates to the field of slide rail technology, specifically to long-stroke synchronous rails. Background Technology

[0002] Drawer slides are common hardware components used in drawers of furniture, appliances, and cabinets. Installed on the sides or bottom of drawers, they allow drawers of different sizes to be smoothly pushed and pulled to retrieve items. To improve the synchronicity of the side slides and the smoothness of the drawer's movement, existing drawer slides typically employ a rack and pinion mechanism and a synchronizing rod structure. Examples include CN106037297B's "Synchronous Drawer Slide System with Noise Reduction and Spring-Rebound Function," CN110916390A's "A Synchronous Drawer Slide with Integrated Damping Closing and Locking Mechanism," and CN210114208U. The "concealed synchronous slide rail that can be quickly assembled" has racks that are fixedly arranged by housing components, external fixing seats or guide rail brackets. Gears that mesh with the racks are installed on the movable rail in the slide rail assembly. Then, two gears on both sides of the drawer are connected by a synchronizing rod to realize the synchronous movement of the slide rail and the smooth pushing and pulling of the drawer. Since the gears are installed on the movable rail, the meshing gears cannot move forward after moving to the end of the rack due to the length of the rack. This results in a limited pulling distance of the movable rail. Even with a three-section rail, the drawer cannot be fully pulled out, which affects the loading and unloading of items and is also inconvenient for drawer disassembly and maintenance. Summary of the Invention

[0003] To address the shortcomings of existing synchronous rails, which have limited travel range and make it inconvenient to pick up, put down, disassemble, and maintain items, this invention provides a long-travel synchronous rail. This rail maximizes the travel distance of the movable rail, allowing the drawer to be fully pulled out, making disassembly and maintenance convenient and items easy to pick up and put down.

[0004] The present invention adopts the following technical solution: it includes two sets of slide rail assemblies arranged opposite to each other. Each set of slide rail assemblies includes a fixed rail, a movable rail, and a middle rail bridging the fixed rail and the movable rail. A rack housing is fitted on the outside of the fixed rail, and a gear is engaged with the rack of the rack housing. The gears in the two sets of slide rail assemblies are connected by a synchronizing rod. The invention is characterized in that: the gear is installed on the middle rail, the middle rail is equipped with a traction transmission mechanism, the movable rail is connected to the traction transmission mechanism, and the movable rail and the middle rail can perform synchronous and unidirectional pushing and pulling translational movements under the traction action of the traction transmission mechanism.

[0005] Its further features are:

[0006] The gear is mounted on the rear end of the middle rail via a base;

[0007] The base includes a circular block, and support blocks are evenly arranged along the circumference of the circular block, wherein two opposing support blocks are mounting feet, and a first stepped hole is opened in the center of the circular block.

[0008] The traction transmission mechanism includes an annular transmission belt, with synchronous pulleys installed near the front and rear ends of the middle rail, and the annular transmission belt wrapped around the outer circumference of the synchronous pulleys.

[0009] The synchronous pulley has a second stepped hole in its center. The synchronous pulley includes a top plate, a bottom plate, and a rotating wheel located between the top plate and the bottom plate and cooperating with the annular transmission belt.

[0010] The synchronous pulley located at the rear end of the middle rail is embedded in the base;

[0011] The second stepped hole of the synchronous pulley located at the rear end of the middle rail is a two-stage stepped hole, and the stepped surface is opposite to the stepped surface of the first stepped hole of the base;

[0012] The movable rail is connected to the annular transmission belt via a connecting block;

[0013] Each of the slide rail assemblies is also provided with a slide rail rebound mechanism. The slide rail rebound mechanism includes a rebound body, a slider, a toggle block, a damping device, and a spring. The rebound body is fixedly installed in the groove at the bottom of the rack housing. The toggle block is installed on the movable rail. The rear end of the damping device and the spring are both fixedly installed on the rebound body, and the damping device is arranged parallel to the spring. The front end of the damping rod of the damping device and the front end of the spring are respectively connected to the slider. The slider is installed on the guide structure of the rebound body and can move along the guide structure. The toggle block can cooperate with the slider to drive the slider to move along the guide structure.

[0014] With the above-described structure, this invention features a traction transmission mechanism installed on the central rail, with a gear meshing with the rack mounted on the central rail. The movable rail is connected to the traction transmission mechanism. When the drawer is pushed or pulled, the traction transmission mechanism acts like a movable pulley system, allowing the movable rail and the central rail to move synchronously and in the same direction. Thus, when the drawer is pulled out, the movable rail can move twice the distance the gear can move. Since the gear is fixedly mounted on the central rail, the bridging effect of the central rail is maximized when it is pulled out relative to the fixed rail, allowing the movable rail to achieve its maximum movement distance when fully pulled out. This allows the drawer to be fully pulled out and positioned outside the cabinet, facilitating not only the retrieval of items but also the disassembly and maintenance of the drawer and slide rail assembly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the long-stroke synchronous rail in the closed state of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure in the stretched state according to the first embodiment of the present invention.

[0017] Figure 3 This is an exploded structural diagram of the first embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the structure of one set of slide rail assemblies in the first embodiment of the present invention, after removing the movable rail and the toggle block.

[0019] Figure 5 This is a schematic diagram of the structure of one set of slide rail components in the second embodiment of the present invention, after removing the movable rail and the toggle block.

[0020] Figure 6 This is a schematic diagram of the front and back structures of the base in this invention.

[0021] Figure 7 This is an exploded structural diagram of the slide rail springback mechanism in this invention.

[0022] Figure 8 This is a schematic diagram of the front and back structures of the gear in this invention.

[0023] Figure 9 This is a schematic diagram of the front and back structures of the synchronous wheel located at the rear end of the middle rail in the first embodiment of the present invention.

[0024] Figure 10 This is a schematic diagram of the front and back structures of the synchronous wheel located at the front end of the middle rail in the first embodiment of the present invention.

[0025] Figure 11 This is a schematic diagram of the front and back structures of the connecting block in the first embodiment of the present invention.

[0026] Figure 12 This is a schematic diagram of the front and back structures of the synchronous wheel located at the rear end of the middle rail in the second embodiment of the present invention.

[0027] Figure 13 This is a schematic diagram of the front and back structures of the connecting block according to the second embodiment of the present invention. Detailed Implementation

[0028] The invention will now be further described with reference to the accompanying drawings:

[0029] like Figures 1-13As shown, the present invention provides a long-stroke synchronous rail, which includes two sets of slide rail assemblies 1 (2) arranged opposite to each other. Each set of slide rail assemblies includes a fixed rail 102 (202), a movable rail 105 (205), and a middle rail 103 (203) bridging the fixed rail and the movable rail. A rack housing 101 (201) is fitted on the outside of the fixed rail. A rack 118 (218) of the rack housing meshes with a gear 106 (206). The gears 106 and 206 in the two sets of slide rail assemblies are connected by a synchronous rod 3. The gear 106 (206) is installed on the middle rail 103 (203). Figures 3-6 As shown, gear 106 (206) is mounted on the rear end of the middle rail 103 (203) via base 107 (207); base 107 (207) includes a circular block 4, with support blocks 5 evenly arranged along the circumference of the circular block 4, wherein two opposing support blocks 5 are mounting feet 6, and a first stepped hole 7 is opened in the center of the circular block 4; the middle rail 103 (203) is equipped with a traction transmission mechanism, and the movable rail 105 (205) is connected to the traction transmission mechanism. When the drawer is pushed or pulled, the traction transmission mechanism... Similar to a movable pulley system, it allows the movable rail and the middle rail to move synchronously and in the same direction. Therefore, when the drawer is pulled out, the movable rail can move twice as far as the gear can move. Since the gear is fixedly installed on the middle rail, the bridging effect of the middle rail is maximized when it is pulled out relative to the fixed rail. This allows the movable rail to move the maximum distance when fully extended, so that the drawer is fully extended and located outside the cabinet. This not only makes it convenient to put and take out items, but also facilitates the disassembly, assembly, and maintenance of the drawer and slide rail assembly.

[0030] First embodiment:

[0031] like Figures 3-4 , Figure 6 and Figures 9-11 As shown, the traction transmission mechanism includes an annular transmission belt, which is a synchronous belt 109 (209) with teeth on its inner surface. Synchronous pulleys 110 (210) and 108 (208) are respectively installed near the front and rear ends of the middle rail 103 (203) and the middle rail 103 (203). The annular transmission belt wraps around the outer periphery of the synchronous pulleys 110 (210) and 108 (208). The center of each synchronous pulley has a second stepped hole 13, 25. The synchronous pulley includes a top plate 12, a bottom plate 14, and a rotating wheel located between the top plate 12 and the bottom plate 14 and cooperating with the synchronous belt. Figure 9 and Figure 10 As shown, the rotating wheel is a toothed wheel 15, which forms a meshing transmission with the synchronous belt 109 (209) with teeth on its inner surface; the synchronous wheel 108 (208) located at the rear end of the middle rail is embedded in the base 107 (207); the second stepped hole 13 of the synchronous wheel 108 (208) located at the rear end of the middle rail is a two-stage stepped hole, and the stepped surface 16 is opposite to the stepped surface 8 of the first stepped hole 7 of the base 107 (207).

[0032] like Figure 4 and Figure 11 As shown, the movable rail 105 (205) is connected to the synchronous belt 109 (209) through a connecting block; the connecting block is a snap-fit ​​connecting block 112 (212), which is provided with a toothed block 18 that meshes with the synchronous belt 109 (209) and a mounting hole 17 that cooperates with the movable rail 105 (205). Above the toothed block 18, the snap-fit ​​connecting block 112 (212) is provided with a pressure plate 19. At one end of the mounting hole 17, the snap-fit ​​connecting block 112 (212) has an arched groove 20. The snap-fit ​​connecting block is detachable and can be installed by meshing with the synchronous belt through the toothed block, which is convenient for loading, unloading, maintenance and replacement, as well as adjustment of the installation position of the movable rail; the arched groove is convenient for fixing the movable rail with rivets, which can improve the stability of the slide rail and avoid friction between the rivet protrusion and the middle rail, thus extending the service life of the slide rail.

[0033] Second embodiment:

[0034] like Figure 5 , Figure 12 and Figure 13 As shown, the traction transmission mechanism includes an annular transmission belt, which is a flexible belt 109′ (not shown) (209′). Synchronous pulleys 110′ (not shown) (210′) and 108′ (208′) are respectively installed near the front and rear ends of the middle rail 103 (203). The annular transmission belt wraps around the outer periphery of the synchronous pulleys 110′ (210′) and 108′ (208′). A second stepped hole 13 is opened in the center of the synchronous pulley. The synchronous pulley includes a top plate 12, a bottom plate 14, and a rotating wheel located between the top plate 12 and the bottom plate 14 and cooperating with the synchronous belt. Figure 12 As shown, the rotating wheel is a V-groove wheel 22, which forms a friction drive with the flexible belt 109′ (not shown) (209′); the synchronous wheel 108′ (208′) located at the rear end of the middle rail is embedded in the base 107 (207); the second stepped hole 13 of the synchronous wheel 108′ (208′) located at the rear end of the middle rail is a two-stage stepped hole, and the stepped surface 16 is opposite to the stepped surface 8 of the first stepped hole 7 of the base 107 (207).

[0035] like Figure 5 and Figure 13As shown, the movable rail 105 (205) is connected to the synchronous belt 109 (209) through the connecting block; the connecting block is a series connecting block 112′ (212′), the series connecting block 112′ (212′) is provided with a series block 23 connected to the flexible belt 109′ (not shown) (209′) and a mounting hole 17 that is installed in conjunction with the movable rail 105 (205). The series block 23 has a through hole 24. Above the series block 23, the series connecting block 112′ (212′) is provided with a pressure plate 19. At one end of the mounting hole 17, the series connecting block 112′ (212′) has an arched groove 20. The series connecting block 112′ (212′) is connected to the flexible belt through the through hole 24 on the series block 23, which can improve the smoothness of pushing and pulling.

[0036] In both Embodiment 1 and Embodiment 2, each slide rail assembly 1 (2) is further provided with a slide rail springback mechanism, such as... Figures 1-5 and Figure 7 As shown, the slide rail rebound mechanism includes a rebound body 114 (214), a slider 117 (217), a toggle block 113 (213), a damping device 116 (216), and a spring 115 (215). The rebound body 114 (214) is fixedly installed in the groove 21 at the bottom of the rack housing 101 (201). The toggle block 113 (213) is installed on the movable rail 105 (205). The rear ends of the damping device 116 (216) and the spring 115 (215) are all fixedly installed on the rebound body 114 (214), and the damping device 116 (216) and the spring 115 (215) are arranged parallel to each other. The damping rod of the damping device is located at the front end of the damping rod. The end and the front end of the spring are respectively connected to the slider 117 (217). The slider 117 (217) is installed on the guide structure of the rebound body 114 (214) and can move along the guide structure. The actuating block 113 (213) can cooperate with the slider 117 (217) to drive the slider 117 (217) to move along the guide structure. The slide rail rebound mechanism can buffer the push and pull speed of the slide rail, prevent excessive collision between the drawer and the cabinet, improve the service life of the drawer and the quietness of the slide rail. For the detailed structure and installation method of the slide rail rebound mechanism, please refer to patent CN106037297B "Synchronous drawer slide rail system with noise reduction and rebound function".

[0037] Taking the first embodiment as an example, its working principle is explained as follows: Figures 1-4 and Figures 6-11As shown, two sets of slide rail assemblies are arranged opposite to each other, namely the left slide rail assembly 1 and the right slide rail assembly 2. The left slide rail assembly 1 includes a fixed rail 102, a movable rail 105, and a middle rail 103. A rack housing 101 is fitted on the outside of the fixed rail 102, and the rack 118 of the rack housing 101 meshes with a gear 106. The middle rail 103 is equipped with a traction transmission mechanism, which includes an annular transmission belt, which is a synchronous belt 109. Synchronous pulleys 110 and 108 are respectively installed near the front and rear ends of the middle rail 103. The synchronous belt 109 is wrapped around the synchronous pulley 110. The outer periphery of 10 and 108; the synchronous pulley 108 located at the rear end of the middle rail is embedded in the stepped surface 8 of the first stepped hole 7 of the base 107 through the top plate 12. The stepped surface 8 of the first stepped hole 7 of the base 107 is opposite to the stepped surface 16 of the two-stage stepped holes 13 of the synchronous pulley 108, thus forming a mounting cavity. The central shaft 11 of the gear 106 passes through the first stepped hole 7 of the base 107 and is inserted into the first-stage stepped surface of the two-stage stepped holes 13 of the synchronous pulley 108. Then, the gear 106 is mounted on the middle rail 103 through the mounting feet 6 of the base 107, and the gear 106 is aligned with the synchronous pulley. The concentric connection formed by 108 not only facilitates assembly and disassembly but also achieves coaxial rotation, further improving synchronization. The traction transmission mechanism is fixedly installed on the middle rail 103 through the second-stage stepped section of the two-stage stepped holes 13 of the synchronous pulley 108 and the second-stage stepped hole 25 of the synchronous pulley 110. The top plate 12 and bottom plate 14 of the synchronous pulleys 108 and 110, as well as the wheel structure located between the top plate 12 and bottom plate 14 and cooperating with the synchronous belt, enhance the stability and transmission effect of the traction transmission mechanism, thereby ensuring the smoothness of the slide rail push and pull. The movable rail 105 is secured by rivets and... Mounting hole 17 is fixedly connected to snap-fit ​​connecting block 112, which is snapped onto synchronous belt 109 via toothed block 18 and pressure plate 19; the actuating block 113 of slide rail rebound mechanism is mounted on movable rail 105, and the slider 117, damping device 116 and spring 115 of slide rail rebound mechanism are mounted in groove 21 of rack housing 101 via rebound body 114; a ball retainer 104 is provided between movable rail 105 and middle rail 103 to increase the smoothness of pushing and pulling; a buffer block 111 is snapped onto the end of movable rail 105 to improve aesthetics and safety.

[0038] The right slide rail assembly 2 includes a fixed rail 202, a movable rail 205, and a middle rail 203. A rack housing 201 is fitted on the outside of the fixed rail 202. The rack 218 of the rack housing 201 meshes with a gear 206. A traction transmission mechanism is installed on the middle rail 203. The traction transmission mechanism includes an annular transmission belt, which is a synchronous belt 209. Synchronous pulleys 210 and 208 are respectively installed near the front and rear ends of the middle rail 203. The synchronous belt 109 is wrapped around the outer periphery of the synchronous pulleys 210 and 208. The synchronous pulley 208 located at the rear end of the middle rail is embedded in the stepped surface 8 of the first stepped hole 7 of the base 207 through the top plate 12. The stepped surface 8 of the first stepped hole 7 of the base 207 is opposite to the stepped surface 16 of the two-stage stepped holes 13 of the synchronous pulley 208, thus forming an installation cavity. The central shaft 11 of the gear 106 passes through the first stepped hole 7 of the base 107 and is inserted into the two-stage stepped holes 13 of the synchronous pulley 208. The first step surface of the 3 is then installed on the middle rail 203 through the mounting feet 6 of the base 207 and the gear 206, and the gear 206 is concentrically connected with the synchronous pulley 208; the traction transmission mechanism is fixedly installed on the middle rail 203 through the second step section of the two-stage stepped holes 13 of the synchronous pulley 208 and the second step hole 25 of the synchronous pulley 210; the movable rail 205 is fixedly connected to the snap-fit ​​connecting block 212 through rivets and mounting holes 17, and the snap-fit ​​connecting block 212 is snapped onto the synchronous belt 209 through the toothed block 18 and the pressure plate 19; the actuating block 213 of the slide rail rebound mechanism is installed on the movable rail 205, and the slider 217, damping device 216 and spring 215 of the slide rail rebound mechanism are installed in the groove 21 of the rack housing 201 through the rebound body 214; a ball retainer 2042 is provided between the movable rail 205 and the middle rail 203; a buffer block 211 is snapped onto the end of the movable rail 205.

[0039] like Figures 3-5 and Figure 8 As shown, gears 106 and 206 are respectively mounted on both ends of the synchronizing rod 3 via square bushing 10 and T-shaped clamping plate 9, thereby connecting the left slide rail assembly 1 and the right slide rail assembly 2 through the synchronizing rod 3; the connection method between the gears and the synchronizing rod can also be found in patent CN106037297B "Synchronous drawer slide rail system with noise reduction and rebound function".

[0040] The left slide rail assembly 1 and the right slide rail assembly 2 are installed on both sides of the drawer via movable rails 105 and 205, respectively, and are installed on the cabinet via rack and pinion housings 101 and 201. When the drawer is pushed or pulled, the annular transmission belt and synchronous pulley in the traction transmission mechanism are similar to a movable pulley system, which allows the movable rail and the middle rail to move synchronously and in the same direction. That is, the movable rail and the middle rail move synchronously in a straight line along the closing or stretching direction of the slide rail. At the same time, the traction transmission mechanism pulls the gear fixedly installed on the middle rail through the middle rail to move in the same direction in a straight line along the rack. Therefore, when the drawer is pulled open, the movable rail moves twice the distance of the gear when the gear stops moving due to the limiting of the connecting block on the synchronous belt. Since the gear is fixedly installed on the middle rail, the bridging effect of the middle rail is maximized when the middle rail is pulled out relative to the fixed rail, and the movable rail achieves the maximum movement distance of being fully pulled out, thereby fully pulling out the drawer and placing the whole drawer outside the cabinet.

[0041] In particular, in both embodiments, the synchronizing wheel located at the rear end of the middle rail is embedded in the base of the mounting gear, so the synchronizing wheel and the gear form a concentric connection, and the synchronicity of the traction transmission mechanism pulling the gear to move in the same direction is better.

Claims

1. A long stroke synchronous rail, comprising two sets of slide rail assemblies arranged oppositely, each of the slide rail assemblies comprising a fixed rail, a movable rail, and a middle rail bridging the fixed rail and the movable rail, a rack housing being sleeved outside the fixed rail, a rack of the rack housing engaging a gear, the gears in the two sets of slide rail assemblies being connected by a synchronous rod, characterized in that: The gear is installed on the middle rail, the middle rail is installed with a traction transmission mechanism, the movable rail is connected with the traction transmission mechanism, and the movable rail and the middle rail can make synchronous and same-direction pushing and pulling movement under the traction of the traction transmission mechanism; The gear is installed on the rear end of the middle rail through a base; The base comprises a circular block, support blocks are uniformly arranged along the circumference of the circular block, two opposite support blocks are mounting feet, and a first stepped hole is formed in the center of the circular block; The traction transmission mechanism comprises an annular transmission belt, synchronous wheels are installed near the front end and the rear end of the middle rail respectively, and the annular transmission belt is wound around the outer periphery of the synchronous wheels; the gear and the synchronous wheel at the rear end are in concentric connection; Each group of the slide rail assembly is also provided with a slide rail rebound mechanism, the slide rail rebound mechanism comprises a rebound main body, a sliding block, a pushing block, a damping device and a spring, the rebound main body is fixed in a groove at the bottom of the rack shell, the pushing block is installed on the movable rail, the rear end of the damping device and the spring are fixed on the rebound main body, the damping device and the spring are arranged in parallel, the front end of the damping rod of the damping device and the front end of the spring are connected with the sliding block respectively, the sliding block is installed on a guide structure of the rebound main body and can move along the guide structure, and the pushing block can cooperate with the sliding block to drive the sliding block to move along the guide structure. The movable rail is connected with the annular transmission belt through a connecting block; When the annular transmission belt is a synchronous belt with a tooth-shaped inner surface: The connecting block is a clamping type connecting block, the clamping type connecting block is provided with a tooth block meshing with the synchronous belt and a mounting hole matched with the movable rail, a pressing plate is arranged above the tooth block, an arc-shaped slot is formed in one end of the mounting hole, the clamping type connecting block is detachably installed by meshing the tooth block with the synchronous belt, and the connecting block is arranged at the terminal position of the movable rail. When the annular transmission belt is a flexible belt: The connecting block is a series type connecting block, the series type connecting block is provided with a series block connected with the flexible belt and a mounting hole matched with the movable rail, the series block is provided with a through hole, a pressing plate is arranged above the series block, an arc-shaped slot is formed in one end of the mounting hole, and the series type connecting block is connected with the flexible belt through the through hole in the series block.

2. The long-stroke synchronous rail according to claim 1, characterized in that: The center of the synchronous wheel is provided with a second stepped hole, and the synchronous wheel comprises a top plate, a bottom plate and a rotating wheel between the top plate and the bottom plate and matched with the annular transmission belt.

3. The long-stroke synchronous rail according to claim 2, characterized in that: The synchronous wheel at the rear end of the middle rail is embedded in the base.

4. The long-stroke synchronous rail of claim 2, wherein: The second stepped hole of the synchronous wheel at the rear end of the middle rail is a two-stage stepped hole, and the stepped surface is opposite to the stepped surface of the first stepped hole of the base.

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