A type of heavy-duty three-section drawer slide

Abstract

A high-load-bearing three-section drawer slide includes a lower rail, an upper rail, and a middle rail connecting the upper and lower rails. The middle rail has an hourglass-shaped cross-section and includes a horizontally extending upper end plate and a lower end plate. The upper end plate has a first and a second waist plate extending downwards and inwards on both sides, while the lower end plate has a third and a fourth waist plate extending upwards and inwards on both sides. A vertically arranged first web plate connects the first and third waist plates, and a vertically arranged second web plate connects the second and fourth waist plates. Both the upper and middle rails are bent into a groove-like structure. The upper rail is fitted onto the upper end of the middle rail, and the lower rail is fitted onto the lower end of the middle rail. The upper and middle rails are connected by an upper bead cage, and the middle and lower rails are connected by a lower bead cage. The beneficial effect of this utility model is that the middle rail in this invention forms a hollow tubular structure, significantly enhancing its resistance to deformation and overall load-bearing capacity.

Description

Technical Field

[0001] This utility model relates to the field of hardware accessories technology, specifically a heavy-duty three-section drawer slide. Background Technology

[0002] Drawer slides are widely used functional components in furniture, industrial equipment, and other fields, used to enable smooth pushing and pulling of drawers, trays, and other components. A common three-section drawer slide typically consists of an outer rail (or bottom rail) fixed to the cabinet body, an inner rail (or top rail) connected to the drawer, and a middle rail connecting the inner and outer rails. The three sections extend and retract in unison through the sliding engagement of ball bearings or pin bearings.

[0003] However, existing three-section drawer slides typically employ open-groove structures (such as C-shaped or U-shaped grooves) formed by bending sheet metal for the upper, middle, and lower rails. While this open-groove structure is relatively easy to manufacture, it has significant drawbacks in practical use. First, due to its open cross-section, its torsional and bending stiffness is insufficient. Under heavy loads, the rails are prone to deformation, leading to drawer slippage, jamming, or even damage. Second, the open-groove structure limits the overall load-bearing capacity of the slide, making it difficult to meet the demands of heavy-duty applications. To improve load-bearing capacity, it is often necessary to increase material thickness or enlarge the cross-sectional dimensions, but this increases material costs and installation space, contradicting the trend towards lightweight and compact designs. Furthermore, the open structure is prone to dust accumulation, affecting the lifespan and smoothness of the slides. Therefore, further improvements are necessary. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of existing technologies and provide a high-load-bearing three-section drawer slide that is more stable in structure, has strong resistance to deformation, high load-bearing capacity, and is also compact.

[0005] The purpose of this utility model is achieved through the following means: a heavy-duty three-section drawer slide rail, which includes a lower rail fixed to the cabinet body and an upper rail connected to the drawer, and a middle rail connecting the upper rail and the lower rail. The cross-section of the middle rail is "hourglass-shaped". The middle rail includes a horizontally extending upper end plate and a lower end plate. The upper end plate has a first waist plate and a second waist plate extending downward and inward on both sides. The lower end plate has a third waist plate and a fourth waist plate extending upward and inward on both sides. A vertically arranged first web plate connects the first waist plate and the third waist plate. A vertically arranged second web plate connects the second waist plate and the fourth waist plate.

[0006] Both the upper and middle rails are bent into a groove-shaped structure. The upper rail is fitted onto the upper end of the middle rail, and the lower rail is fitted onto the lower end of the middle rail. The upper and middle rails are connected by an upper bead frame, and the middle and lower rails are connected by a lower bead frame.

[0007] Furthermore: the upper end plate has a concave upper guide groove on its surface, and a first needle roller is installed in the upper bead holder, which slides within the upper guide groove.

[0008] Furthermore, the lower end plate has an upwardly concave lower guide groove on its surface, and a second needle roller is installed inside the lower ball holder, which slides within the lower guide groove.

[0009] Furthermore: a third needle roller is provided on one side of the upper bead frame and slides between the first waist plate and the upper rail; a fourth needle roller is provided on the other side of the upper bead frame and slides between the second waist plate and the upper rail.

[0010] Furthermore: a fifth needle roller is provided on one side of the lower bead frame, which slides between the third waist plate and the lower rail; a sixth needle roller is provided on the other side of the lower bead frame, which slides between the fourth waist plate and the lower rail.

[0011] Furthermore, the central rail is a hollow tubular structure integrally bent from a metal sheet.

[0012] Furthermore, the central rail is made of aluminum profile.

[0013] Furthermore, the angle between the upper end plate and the first and second waist plates on both sides is 35° to 50°.

[0014] Furthermore, the angle between the lower end plate and the third and fourth waist plates on both sides is 35° to 50°.

[0015] Furthermore, the lower rail sidewall extends outward with a main support, which is connected to the cabinet.

[0016] The beneficial effects of this utility model are: 1. Simple structure, low production cost, and improved market competitiveness.

[0017] 2. The cross-section of the center rail in this design is hourglass-shaped, forming a hollow tubular structure. Compared to the open slotted structures commonly found in existing technologies, this tubular structure has superior moment of inertia and torsional stiffness, significantly enhancing the center rail's resistance to deformation and overall load-bearing capacity. Even under heavy loads or prolonged use, it effectively prevents bending, twisting, and other deformations of the rail, ensuring smooth and stable drawer operation.

[0018] 3. The middle rail of this utility model, through its structural features, has an upper guide groove formed by a downward concave shape on the surface of the upper end plate, and a lower guide groove formed by an upward concave shape on the surface of the lower end plate. The upper and lower end plates, as horizontally extending plates, naturally form a large flat surface that supports the ball bearings. This provides the needle rollers with a spacious and stable sliding surface and guiding space, effectively distributing the load, reducing local stress between the needle rollers and the rail surface, and ensuring the smoothness and accuracy of the needle rollers sliding within the guide grooves. Attached Figure Description

[0019] Figure 1 , 2 This is a rendering of the final assembly of this utility model.

[0020] Figure 3 , 4 This is an exploded view of the structure of this utility model.

[0021] Figure 5 In this utility model Figure 3 A magnified view of the local structure.

[0022] Figure 6 This is a cross-sectional view of the structure of this utility model.

[0023] Figure 7 This is a schematic diagram of the middle rail structure of this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Lower rail; 2. Upper rail; 3. Middle rail; 31. Upper end plate; 32. Lower end plate; 33. First waist plate; 34. Second waist plate; 35. Third waist plate; 36. Fourth waist plate; 37. First web plate; 38. Second web plate; 4. Upper bead cage; 41. First needle roller; 42. Third needle roller; 43. Fourth needle roller; 5. Lower bead cage; 51. Second needle roller; 52. Fifth needle roller; 53. Sixth needle roller; 6. Upper guide groove; 7. Lower guide groove; 8. Main support. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings. A heavy-duty three-section drawer slide includes a lower rail 1 fixed to the cabinet body and an upper rail 2 connected to the drawer. It also includes a middle rail 3 connecting the upper rail 2 and the lower rail 1. The cross-section of the middle rail 3 is hourglass-shaped. The middle rail 3 includes a horizontally extending upper end plate 31 and a lower end plate 32. The upper end plate 31 has a first waist plate 33 and a second waist plate 34 extending downward and inward on both sides. The lower end plate 32 has a third waist plate 35 and a fourth waist plate 36 extending upward and inward on both sides. A vertically arranged first web plate 37 connects the first waist plate 33 and the third waist plate 35. A vertically arranged second web plate 38 connects the second waist plate 34 and the fourth waist plate 36.

[0026] The upper rail 2 and the middle rail 3 are both bent into a groove-shaped structure. The upper rail 2 is fitted on the upper end of the middle rail 3, and the lower rail 1 is fitted on the lower end of the middle rail 3. The upper rail 2 and the middle rail 3 are connected by an upper bead frame 4, and the middle rail 3 and the lower rail 1 are connected by a lower bead frame 5.

[0027] In this embodiment, the cross-section of the middle rail 3 is hourglass-shaped. Its structure is formed by the horizontally extending upper end plate 31 and lower end plate 32, as well as the inclined waist plate and vertical web plate connecting them, constituting a specific hollow irregular cross-section. This structure provides the basic form for subsequent sliding fit.

[0028] The upper rail 2 is bent into a groove-like structure and fitted onto the upper part of the middle rail 3. The upper rail 2 is connected to the middle rail 3 via the upper bead frame 4, allowing the upper rail 2 to slide relative to the middle rail 3.

[0029] The lower rail 1 is bent into a groove-like structure and fitted into the lower area of ​​the middle rail 3. The lower rail 1 is connected to the middle rail 3 via the lower bead bracket 5, allowing the lower rail 1 to slide relative to the middle rail 3.

[0030] When the drawer is pulled out or pushed in, the upper rail 2 first slides relative to the middle rail 3, causing the middle rail 3 to move; then, the middle rail 3 slides relative to the lower rail 1. Through the bearing and guiding functions of the upper ball bearing 4 and the lower ball bearing 5, the smooth linkage and extension of the three rails are achieved, thereby achieving the purpose of the drawer being fully extended or retracted.

[0031] Compared with traditional technology, the middle rail 3 adopts an hourglass-shaped cross-section design and is formed by connecting multiple plates and webs. This polygonal or nearly closed structure provides stronger torsional and bending stiffness compared with simple C-shaped or U-shaped channels, thereby enhancing the structural stability of the middle rail and effectively resisting deformation.

[0032] Meanwhile, this complex cross-section with a non-open groove can more effectively distribute and bear the weight and lateral forces from the drawer, providing more reliable support for heavy load-bearing scenarios. Since the upper rail 2 and lower rail 1 are also "bent into a groove structure" and fit together with the middle rail 3 in a nested manner, this nested structure helps to limit the radial and lateral deformation of each rail, improving the overall operating accuracy and reliability.

[0033] In one embodiment: the upper end plate 31 has a downwardly concave upper guide groove 6, and a first needle roller 41 is installed in the upper ball holder 4, and the first needle roller 41 slides in the upper guide groove 6.

[0034] In this embodiment, the surface of the upper end plate 31 extending horizontally from the middle rail 3 is specially designed with a downwardly concave upper guide groove 6. The first needle roller 41 installed in the upper ball cage 4 is accommodated and slides within the upper guide groove 6. When the upper rail 2 slides relative to the middle rail 3, the first needle roller 41 rolls within the upper guide groove 6, precisely guiding the linear movement of the upper ball cage 4 and the upper rail 2.

[0035] The guide groove design provides a clear sliding trajectory for the needle rollers, effectively preventing them from deviating and ensuring the smoothness and accuracy of the sliding between the upper rail 2 and the middle rail 3.

[0036] In addition, the rolling of the needle rollers in the guide groove replaces sliding friction, which significantly reduces frictional resistance, making the drawer easier and smoother to push and pull, while also reducing component wear and extending the service life of the slide rails.

[0037] At the same time, the cooperation between the first needle roller and the guide groove increases the effective load-bearing points, which helps to improve the local load-bearing capacity.

[0038] In one embodiment: the lower end plate 32 has a concave lower guide groove 7 on its surface, and a second needle roller 51 is installed in the lower ball holder 5, which slides within the lower guide groove 7.

[0039] In this embodiment, a "lower guide groove 7" is designed with an upward concave shape on the surface of the lower end plate 32 extending horizontally from the middle rail 3. The second needle roller 51 installed in the lower ball holder 5 is accommodated and slides within the lower guide groove 7. When the drawer moves, as the middle rail 3 slides relative to the lower rail 1, the second needle roller 51 rolls within the lower guide groove 7, precisely guiding the linear movement of the lower ball holder 5 and the middle rail 3.

[0040] Similar to the upper guide groove, the lower guide groove ensures the precise and smooth sliding of the middle rail 3 on the lower rail 1, providing bidirectional motion guidance and further improving the overall stability of the slide rail operation.

[0041] Therefore, the configuration of the upper and lower guide grooves and needle rollers allows the load in the vertical direction to be more evenly distributed on the upper and lower parts of the slide rail, further improving the overall load-bearing capacity and deformation resistance.

[0042] In one embodiment: a third needle roller 42 is provided on one side of the upper bead frame 4 and slides between the first waist plate 33 and the upper rail 2; a fourth needle roller 43 is provided on the other side of the upper bead frame 4 and slides between the second waist plate 34 and the upper rail 2.

[0043] In this embodiment, the upper bead carrier 4, in addition to having vertically oriented needle rollers, also has third needle rollers 42 and fourth needle rollers 43 arranged on its sides. The third needle rollers 42 slide between the first waist plate 33 of the middle rail 3 and the upper rail 2, while the fourth needle rollers 43 slide between the second waist plate 34 of the middle rail 3 and the upper rail 2. These lateral needle rollers provide support and guidance between the side walls of the middle rail and the upper rail.

[0044] The third and fourth rollers effectively limit the lateral swaying or swinging of the upper rail 2 relative to the middle rail 3, maintaining stability even under heavy loads or lateral impacts, ensuring smooth entry and exit of the drawer.

[0045] In addition, the lateral support of the needle rollers helps to reduce the clearance between the tracks, thereby reducing noise generated during sliding.

[0046] Meanwhile, multi-point needle roller support makes the load distribution between the tracks more uniform, avoids local stress concentration, and improves overall durability.

[0047] In one embodiment: a fifth needle roller 52 is provided on one side of the lower bead frame 5 and slides between the third waist plate 35 and the lower rail 1; a sixth needle roller 53 is provided on the other side of the lower bead frame 5 and slides between the fourth waist plate 36 and the lower rail 1.

[0048] In this embodiment, the lower bead carrier 5 is also equipped with a fifth needle roller 52 and a sixth needle roller 53 on both sides. The fifth needle roller 52 slides between the third waist plate 35 of the middle rail 3 and the lower rail 1, while the sixth needle roller 53 slides between the fourth waist plate 36 of the middle rail 3 and the lower rail 1. These needle rollers provide support and guidance between the side walls of the middle rail and the lower rail.

[0049] Similar to the structure described above, the fifth and sixth rollers provide additional lateral support for the sliding between the middle rail 3 and the bottom rail 1, further enhancing the lateral stability and anti-tipping ability of the entire drawer system. This also ensures that the middle and bottom rails do not wobble unnecessarily in the horizontal direction, making the entire drawer movement more compact, smooth, and quiet. Furthermore, this structure reduces direct friction and impact between components, effectively extending the overall service life of the drawer.

[0050] In one embodiment, the central rail 3 is formed by bending a single piece of metal sheet. In this embodiment, a single piece of metal sheet is bent into shape, ultimately forming an hourglass-shaped cross-section, and its interior is a hollow tubular structure.

[0051] In one embodiment, the center rail 3 is made of aluminum profile. In this embodiment, aluminum alloy has good corrosion resistance, which allows the slide rail to maintain stable performance and extend its service life even in humid environments; in addition, aluminum profile extrusion molding can achieve complex cross-sectional shapes with high precision and good surface quality.

[0052] In one embodiment, the angle between the upper end plate 31 and the first waist plate 33 and the second waist plate 34 on both sides is 35° to 50°.

[0053] In one embodiment, the angle between the lower end plate 32 and the third waist plate 35 and the fourth waist plate 36 on both sides is 35° to 50°.

[0054] This specific angle range, designed and validated, maximizes the structural stiffness of the upper part of the middle rail 3, optimizing its support for the upper rail 2. This angle range helps achieve the ideal fit clearance between the upper rail 2 and the middle rail 3, reducing swaying during movement and ensuring smooth needle roller operation. Simultaneously, the optimized angle helps to more effectively transfer vertical and lateral loads from the upper rail to the overall structure of the middle rail, improving load-bearing efficiency.

[0055] In this example, the key angles of the lower structure of the middle rail 3 are quantitatively defined. This defines the range of inclination angles between the lower end plate 32 and the third and fourth waist plates 35 and 36 connecting its two sides. This angle determines the clearance and support geometry between the lower part of the middle rail and the lower rail 1.

[0056] In one embodiment: the lower rail 1 has a main support 8 extending outward from its side wall, and the main support 8 is connected to the cabinet.

[0057] The lower rail 1 has an outwardly extending main support 8 on its side wall. This main support 8 usually has pre-drilled mounting holes, which are used to securely connect it to the inner wall of the cabinet with screws or other fasteners. The main support 8 provides a standardized installation interface for the slide rail, making the installation process more convenient and faster, and ensuring a more secure connection that is less prone to loosening.

[0058] Specifically: In this case, the slide rail system consists of three main tracks:

[0059] Lower rail 1: As the outermost rail, its side wall extends outward with a main bracket 8, which is firmly installed and fixed to the cabinet or furniture body, providing a stable support base for the entire slide rail system.

[0060] Top rail 2: As the innermost rail, it is directly or indirectly connected to the drawer through its structure, enabling the drawer to move.

[0061] Middle rail 3: Located between lower rail 1 and upper rail 2, serving as a connection and transmission link. Its cross-section is uniquely designed in an "hourglass shape," consisting of horizontally extending upper end plate 31 and lower end plate 32, a first waist plate 33 and a second waist plate 34 connecting the two sides of the upper end plate 31 in a downward and inward direction, a third waist plate 35 and a fourth waist plate 36 connecting the two sides of the lower end plate 32 in an upward and inward direction, and a first web plate 37 and a second web plate 38 vertically connecting the waist plates. This structure makes the middle rail 3 a hollow and highly rigid tubular or irregularly shaped box structure, fundamentally improving its resistance to deformation and load-bearing capacity.

[0062] Upper bead frame 4: It carries the needle rollers, connects and supports the upper rail 2 and the middle rail 3, so that the two can slide smoothly.

[0063] Lower bead carrier 5: It carries the needle rollers, connects and supports the middle rail 3 and the lower rail 1, so that the two can slide smoothly.

[0064] The upper rail 2 is bent into a groove-like structure and cleverly fitted onto the upper end of the middle rail 3. Similarly, the lower rail 1 is also bent into a groove-like structure and uniquely fitted onto the lower end of the middle rail 3. This nesting relationship provides the physical basis for subsequent sliding.

[0065] When the user pulls the drawer: First stage of extension: The upper rail 2, which is connected to the drawer, is pulled first. Under the action of the upper bead holder 4, the upper rail 2 begins to slide outward relative to the middle rail 3.

[0066] The first needle roller 41 installed in the upper bead frame 4 rolls within the upper guide groove 6, which is concave on the surface of the upper end plate 31 of the middle rail 3. The upper guide groove 6 precisely restricts the vertical and horizontal positions of the first needle roller 41, thereby ensuring that the upper rail 2 can extend smoothly and without deviation along the horizontal axis of the middle rail 3 even under heavy load.

[0067] Meanwhile, the third needle roller 42 and the fourth needle roller 43, located on both sides of the upper bead frame 4, abut against the first waist plate 33 and the second waist plate 34 of the middle rail 3 and the corresponding side wall of the upper rail 2, respectively. Through rolling cooperation, they effectively eliminate lateral sway or gaps between the upper rail 2 and the middle rail 3, providing reliable lateral support, ensuring the compactness and precision of the movement, and maintaining stability even under uneven force or lateral impact.

[0068] Second stage of extension: When the upper rail 2 reaches its maximum extension stroke relative to the middle rail 3, the middle rail 3 begins to slide further outward along with the upper rail 2. At this time, the middle rail 3 moves relative to the lower rail 1.

[0069] Similarly, the second needle roller 51 installed in the lower ball bearing 5 rolls within the lower guide groove 7, which is concave upward on the surface of the lower end plate 32 of the middle rail 3. The lower guide groove 7 precisely guides the movement of the second needle roller 51, ensuring smooth sliding of the middle rail 3 relative to the lower rail 1.

[0070] In addition, the fifth needle roller 52 and the sixth needle roller 53, located on both sides of the lower bead frame 5, abut against the third waist plate 35 and the fourth waist plate 36 of the middle rail 3, respectively, between the corresponding side walls of the lower rail 1. They provide crucial lateral support, limiting the lateral offset and overturning of the middle rail 3 relative to the lower rail 1, and ensuring the overall stability and smooth operation of the entire slide rail system under heavy loads.

[0071] Through the two-stage extension process described above, the drawer can be fully extended over a wide range, making it convenient for users to store and retrieve items.

[0072] One key point to highlight is the reinforced structure of the central rail: the "hourglass" cross-section design of central rail 3 creates a hollow tubular or irregularly shaped box structure inside. Compared to traditional open slotted cross-sections, this structure significantly improves its torsional and bending stiffness, effectively resisting deformation under heavy loads, which is crucial for achieving high load-bearing capacity. Whether using integral bending of metal sheets or aluminum profiles, this high-strength, high-rigidity hollow structure can be achieved, while also taking into account the advantages of lightweighting and cost control.

[0073] In addition, the included angles between the upper end plate 31 and the waist plate of the middle rail 3, and between the lower end plate 32 and the waist plate, are limited to 35° to 50°. These precise angle designs optimize the load-bearing efficiency and stiffness of the middle rail section, and ensure the best stress state and sliding clearance when it is in contact with the needle rollers on the ball frame, further improving stability and smoothness.

[0074] The omnidirectional needle roller support system achieves three-dimensional rolling support and precise guidance between the upper and middle rails, and between the middle and lower rails, through the vertical rolling of needle rollers in the guide grooves within the upper and lower ball bearings, and the cooperation of lateral needle rollers with the waist plate and rail sidewalls. This multi-point rolling contact transforms sliding friction into rolling friction, greatly reducing resistance, wear, and noise, while eliminating gaps and wobble between the rails, ensuring extremely smooth, stable, and quiet operation under full stroke and heavy load conditions.

[0075] In summary, the high-load-bearing three-section drawer slide of this utility model, through the coordinated work of the "hourglass-shaped" reinforced center rail, precise guide groove, multi-dimensional needle roller support, and optimized structural angles, achieves superior load-bearing capacity, deformation resistance, smooth sliding, and service life compared to existing technologies. This effectively solves the common problems of traditional drawer slides being prone to deformation and having weak load-bearing capacity under heavy loads, and therefore can be widely promoted and used.

[0076] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A heavy-duty three-section drawer slide, characterized by: It includes a lower rail (1) fixed to the cabinet body, and an upper rail (2) connected to the drawer, and a middle rail (3) connecting the upper rail (2) and the lower rail (1). The cross section of the middle rail (3) is "hourglass-shaped". The middle rail (3) includes a horizontally extending upper end plate (31) and a lower end plate (32). The upper end plate (31) is inclined downward and inward on both sides with a first waist plate (33) and a second waist plate (34). The lower end plate (32) is inclined upward and inward on both sides with a third waist plate (35) and a fourth waist plate (36). A vertically arranged first web plate (37) connects the first waist plate (33) and the third waist plate (35). A vertically arranged second web plate (38) connects the second waist plate (34) and the fourth waist plate (36). The upper rail (2) and the middle rail (3) are both bent into a groove structure. The upper rail (2) is fitted on the upper end of the middle rail (3), and the lower rail (1) is fitted on the lower end of the middle rail (3). The upper rail (2) and the middle rail (3) are connected by an upper bead frame (4), and the middle rail (3) and the lower rail (1) are connected by a lower bead frame (5).

2. The three-section drawer slide rail of claim 1, wherein: The upper end plate (31) has a concave upper guide groove (6) on its surface, and a first needle roller (41) is installed in the upper bead frame (4). The first needle roller (41) slides in the upper guide groove (6).

3. The three-section drawer slide of claim 1, wherein: The lower end plate (32) has an upward concave lower guide groove (7) on its surface, and a second needle roller (51) is installed in the lower ball frame (5). The second needle roller (51) slides in the lower guide groove (7).

4. The three-section drawer slide rail of claim 1 or 2, wherein: The upper bead frame (4) is provided with a third needle roller (42) on one side, which slides between the first waist plate (33) and the upper rail (2); the upper bead frame (4) is provided with a fourth needle roller (43) on the other side, which slides between the second waist plate (34) and the upper rail (2).

5. A heavy-duty three-section drawer slide rail according to claim 1 or 2, characterized in that: The lower bead frame (5) has a fifth roller (52) on one side that slides between the third waist plate (35) and the lower rail (1); the lower bead frame (5) has a sixth roller (53) on the other side that slides between the fourth waist plate (36) and the lower rail (1).

6. The heavy-duty three-section drawer slide according to claim 1, characterized in that: The central rail (3) is a hollow tubular structure formed by bending a metal sheet as a whole.

7. The heavy-duty three-section drawer slide according to claim 1, characterized in that: The middle rail (3) is made of aluminum profile.

8. A heavy-duty three-section drawer slide according to claim 1, characterized in that: The angle between the upper end plate (31) and the first waist plate (33) and the second waist plate (34) on both sides is 35° to 50°.

9. A heavy-duty three-section drawer slide according to claim 1, characterized in that: The angle between the lower end plate (32) and the third waist plate (35) and the fourth waist plate (36) on both sides is 35° to 50°.

10. A heavy-duty three-section drawer slide according to claim 1, characterized in that: The lower rail (1) has a main support (8) extending outward from its side wall, and the main support (8) is connected to the cabinet.

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