Improved three-section synchronous sliding rail

Abstract

The utility model discloses an improved three-section synchronous sliding rail which comprises a support, a lower rail, a middle rail and an upper rail. The upper rail comprises a first upper rail connecting piece and a second upper rail connecting piece; the second upper rail connecting pieces on the two sides vertically extend downwards and are horizontally bent inwards to form third upper rail connecting pieces. The lower rail comprises a first lower rail connecting piece and a second lower rail connecting piece; the second lower rail connecting pieces on the two sides vertically extend upwards and are horizontally bent inwards to form third lower rail connecting pieces. The middle rail comprises a first middle rail connecting piece and a second middle rail connecting piece; the second middle rail connecting pieces on the two sides vertically extend downwards and are horizontally bent outwards to form third middle rail connecting pieces. The second middle rail connecting pieces and the first middle rail connecting pieces on the two sides are connected through arc-shaped blocks. An arc-shaped groove is formed in the third upper rail connecting piece, and the arc-shaped groove and the arc-shaped block are concentric; bearing wheel sets are arranged between the upper rail and the middle rail and between the lower rail and the middle rail. The bearing performance and the stability of the improved three-section synchronous sliding rail are better.

Description

Technical Field

[0001] The utility model belongs to the field of furniture, and particularly relates to an improved three - section synchronous slide rail. Background Art

[0002] Drawers on the market usually use three - section hidden slide rails to realize the outward extraction or inward retraction of the drawer into the furniture. The main components of the three - section hidden slide rail include a lower rail, an upper rail, and a middle rail disposed between the two. For example, the utility model patent with the authorization announcement number CN208941351 U discloses "an improved three - section synchronous slide rail for a three - section drawer". The improved three - section synchronous slide rail for a three - section drawer includes an upper rail, a middle rail, and a lower rail. The upper rail is supported on the middle rail, and the middle rail is supported on the lower rail. The upper rail has a horizontal upper flat plate portion one, and both ends of the upper flat plate portion one are vertically bent downward to form a left vertical portion one and a right vertical portion one. Both the lower end of the right vertical portion one and the lower end of the left vertical portion one extend inward with rounded corners. The middle rail includes an upper flat plate portion two, and both ends of the upper flat plate portion two are bent downward to form an upper left vertical portion two and a right vertical portion two. The right vertical portion two is bent leftward to form a lower flat plate portion two, and the lower flat plate portion two is bent upward to form a lower left vertical portion two. An upper cage is wrapped around the upper end of the middle rail, the upper rail is wrapped outside the upper cage, a lower cage is wrapped around the lower end of the middle rail, and the supporting end of the lower rail is wrapped outside the lower cage, with strong stability, smooth, flexible, and unobstructed sliding, and not easy to shake.

[0003] However, the right vertical portion two of the middle rail of the above - mentioned improved three - section synchronous slide rail for a three - section drawer has a single - vertical support plate structure, and its load - bearing performance is weak. When the load is too large, it is prone to bending deformation, thus affecting the normal use of the improved three - section synchronous slide rail for a three - section drawer. Summary of the Utility Model

[0004] The utility model provides an improved three - section synchronous slide rail in order to overcome the deficiencies existing in the prior art, and the improved three - section synchronous slide rail has better load - bearing performance and stability.

[0005] The technical solution adopted by the utility model to solve the above - mentioned technical problems is as follows:

[0006] An improved three - section synchronous slide rail, comprising a bracket, a lower rail, a middle rail, and an upper rail arranged on the bracket, wherein,

[0007] The upper rail includes a horizontally arranged first upper rail connecting piece and second upper rail connecting pieces arranged on both sides of the first upper rail connecting piece. Among them, the second upper rail connecting pieces on both sides extend vertically downward and are horizontally bent inward to form horizontally extending third upper rail connecting pieces;

[0008] The middle rail includes a first middle rail connecting piece arranged horizontally and second middle rail connecting pieces arranged on both sides of the first middle rail connecting piece. Among them, the second middle rail connecting pieces on both sides extend vertically downward and are horizontally bent outward to form a third middle rail connecting piece extending horizontally; the second middle rail connecting pieces on both sides are connected to the first middle rail connecting piece through arc-shaped blocks. One end of the arc-shaped block is connected to the first middle rail connecting piece, and the other end is connected to the second middle rail connecting piece; an arc-shaped groove is provided on the third upper rail connecting piece, and the arc-shaped groove is concentric with the arc-shaped block;

[0009] The lower rail includes a first lower rail connecting piece arranged horizontally and second lower rail connecting pieces arranged on both sides of the first lower rail connecting piece. Among them, the second lower rail connecting pieces on both sides extend vertically upward and are horizontally bent inward to form a third lower rail connecting piece extending horizontally;

[0010] An upper load-bearing wheel set is arranged between the upper rail and the middle rail, and a lower load-bearing wheel set is arranged between the lower rail and the middle rail.

[0011] Preferably, the gap between the first middle rail connecting piece and the first upper rail connecting piece forms a first upper installation gap; the gap between the arc-shaped block and the arc-shaped groove of the third upper rail connecting piece forms a second upper installation gap; the gap between the second middle rail connecting pieces on both sides of the middle rail and the first lower rail connecting piece forms a first lower installation gap; the gap between the third middle rail connecting piece and the third lower rail connecting piece forms a second lower installation gap.

[0012] Preferably, the upper load-bearing wheel set includes an upper load-bearing frame, a first upper load-bearing component arranged in the middle of the upper load-bearing frame, and second upper load-bearing components arranged on the left and right sides of the upper load-bearing frame. Among them, the first upper load-bearing component is located in the first upper installation gap; the second upper load-bearing component is located in the second upper installation gap.

[0013] Preferably, the first upper load-bearing component includes a first upper load-bearing roller arranged in the middle of the upper load-bearing frame. The first upper load-bearing roller is rotatably connected to the upper load-bearing frame. The upper end of the first upper load-bearing roller contacts the lower surface of the first upper rail connecting piece, and the lower end contacts the upper surface of the first middle rail connecting piece.

[0014] Preferably, the second upper load-bearing component includes multiple groups of upper load-bearing balls arranged on both sides of the upper load-bearing frame. The multiple groups of upper load-bearing balls are arranged in a straight line and are all installed on the upper load-bearing frame through a universal joint structure; each group of upper load-bearing balls is located in the second upper installation gap and is tangent to the arc-shaped block and the arc-shaped groove.

[0015] Preferably, the lower load-bearing wheel set includes a lower load-bearing frame, a first lower load-bearing component disposed in the middle of the lower load-bearing frame, and a second lower load-bearing component and a third lower load-bearing component disposed on the left and right sides of the lower load-bearing frame, wherein the first lower load-bearing component is located within the first lower installation gap; both the second lower load-bearing component and the third lower load-bearing component are located within the second lower installation gap.

[0016] Preferably, the first lower load-bearing component includes a first lower load-bearing roller disposed on the lower side of the lower load-bearing frame; there are multiple groups of the first lower load-bearing rollers, and the multiple groups of first lower load-bearing rollers are arranged in a straight line and are rotatably connected to the lower load-bearing frame; the upper end of each group of first lower load-bearing rollers contacts the lower surface of the first middle rail connecting piece, and the lower end contacts the upper surface of the first lower rail connecting piece.

[0017] Preferably, the second lower load-bearing component includes second lower load-bearing rollers disposed on both sides of the lower load-bearing frame; the second lower load-bearing rollers are rotatably connected within the lower load-bearing frame, and the axial direction of the second lower load-bearing rollers is perpendicular to the axial direction of the first lower load-bearing rollers; the wheel surfaces of the second lower load-bearing rollers respectively contact the outer side surface of the second middle rail connecting piece and the inner side surface of the second lower rail connecting piece.

[0018] Preferably, the third lower load-bearing component includes third lower load-bearing rollers disposed on the upper side of the lower load-bearing frame, wherein there are multiple groups of the third lower load-bearing rollers, and the multiple groups of third lower load-bearing rollers are arranged in a straight line and are rotatably connected to the lower load-bearing frame; the upper end of the third lower load-bearing rollers contacts the lower surface of the third lower rail connecting piece, and the lower end contacts the upper surface of the third middle rail connecting piece.

[0019] Preferably, there are two groups of the brackets, and the two groups of brackets are connected to the upper rail or the lower rail; when the upper rail is connected to the brackets, the lower rail is a movable rail; when the lower rail is connected to the brackets, the upper rail is a movable rail.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] Second middle rail connecting pieces are provided on both sides of the first middle rail connecting piece in the present invention, and the second middle rail connecting pieces on both sides can provide double support for the upper rail, so that the load-bearing capacity of the upper rail can be enhanced. At the same time, the second middle rail connecting pieces on both sides are not easily deformed and have better bending resistance, so that the improved three-section synchronous slide rail of the present invention can work stably and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the improved three-section synchronous slide rail of the present invention.

[0023] Figure 2Side view (section view) of the first specific embodiment of the improved three - section synchronous slide rail of the present utility model.

[0024] Figure 3 Exploded view of the improved three - section synchronous slide rail of the present utility model.

[0025] Figure 4 Schematic diagram of the state when the improved three - section synchronous slide rail of the present utility model is opened.

[0026] Figure 5 Schematic diagram of the state when the improved three - section synchronous slide rail of the present utility model is closed.

[0027] Figure 6 Schematic diagram of the structure of the upper load - bearing wheel set and the first rack.

[0028] Figure 7 Schematic diagram of the structure of the upper load - bearing wheel set.

[0029] Figure 8 Schematic diagram of the structure of the lower load - bearing wheel set and the second rack.

[0030] Figure 9 Schematic diagram of the structure of the lower load - bearing wheel set.

[0031] Figure 10 Schematic diagram of the positions of the first upper installation gap, the second upper installation gap, the first lower installation gap, the second lower installation gap, and the third lower installation gap.

[0032] Figure 11 Cross - sectional view of the upper rail.

[0033] Figure 12 Cross - sectional view of the middle rail.

[0034] Figure 13 Cross - sectional view of the lower rail.

[0035] Figure 14 Side view (section view) of the second specific embodiment of the improved three - section synchronous slide rail of the present utility model. Specific embodiments

[0036] The present utility model will be further described in detail below in conjunction with the embodiments and the drawings, but the embodiments of the present utility model are not limited thereto.

[0037] Embodiment 1

[0038] See Figures 1 - 13 , the improved three - section synchronous slide rail of the present utility model includes a bracket 1, a lower rail 4, a middle rail 3, and an upper rail 2 provided on the bracket 1.

[0039] See Figures 1 - 13, the upper rail 2 includes a horizontally arranged first upper rail connecting piece 201 and second upper rail connecting pieces 202 arranged on both sides of the first upper rail connecting piece 201. Among them, the second upper rail connecting pieces 202 on both sides extend vertically downward and bend horizontally inward to form a horizontally extending third upper rail connecting piece 203; among them, a chamfer or fillet is provided between the first upper rail connecting piece 201 and the second upper rail connecting piece 202; a chamfer or fillet is also provided between the second upper rail connecting piece 202 and the third upper rail connecting piece 203.

[0040] In this embodiment, the first upper rail connecting piece 201, the second upper rail connecting piece 202, and the third upper rail connecting piece 203 can be manufactured by an integral molding process.

[0041] See Figures 1 - 13 See Figures 1 - 13 , the middle rail 3 includes a horizontally arranged first middle rail connecting piece 301 and second middle rail connecting pieces 302 arranged on both sides of the first middle rail connecting piece 301. Among them, the second middle rail connecting pieces 302 on both sides extend vertically downward and bend horizontally outward to form a horizontally extending third middle rail connecting piece 303; a fillet or chamfer is provided between the third middle rail connecting piece 303 and the second middle rail connecting piece 302; among them, the second middle rail connecting pieces 302 on both sides extend vertically downward and bend horizontally outward to form a horizontally extending third middle rail connecting piece 303; the second middle rail connecting pieces 302 on both sides are connected to the first middle rail connecting piece 301 through an arc-shaped block 304. One end of the arc-shaped block 304 is connected to the first middle rail connecting piece 301, and the other end is connected to the second middle rail connecting piece 302; an arc-shaped groove 204 is provided on the third upper rail connecting piece 203, and the arc-shaped groove 204 is concentric with the arc-shaped block 304.

[0042] See Figures 1 - 13 , the lower rail 4 includes a horizontally arranged first lower rail connecting piece 401 and second lower rail connecting pieces 402 arranged on both sides of the first lower rail connecting piece 401. Among them, the second lower rail connecting pieces 402 on both sides extend vertically upward and bend horizontally inward to form a horizontally extending third lower rail connecting piece 403; in this embodiment, the extension length of the third lower rail connecting piece 403 on the left side is less than the extension length of the third lower rail connecting piece 403 on the right side;

[0043] In addition, a chamfer or fillet is provided between the first lower rail connecting piece 401 and the second lower rail connecting piece 402; a chamfer or fillet is also provided between the second lower rail connecting piece 402 and the third lower rail connecting piece 403.

[0044] In this embodiment, the first lower rail connecting piece 401, the second lower rail connecting piece 402, and the third lower rail connecting piece 403 can be manufactured by an integral molding process.

[0045] SeeFigures 1 - 13 A first upper mounting gap A is formed by the gap between the first middle rail connecting piece 301 and the first upper rail connecting piece 201; a second upper mounting gap B is formed by the gap between the arc-shaped block 304 and the arc-shaped groove 204 of the third upper rail connecting piece 203; a first lower mounting gap C is formed by the gap between the second middle rail connecting pieces 202 on both sides of the middle rail 3 and the first lower rail connecting piece 401; a second lower mounting gap D is formed by the gap between the third middle rail connecting piece 303 and the third lower rail connecting piece 403.

[0046] See Figures 1 - 13 An upper load-bearing wheel set 8 is provided between the upper rail 2 and the middle rail 3. The upper load-bearing wheel set 8 includes an upper load-bearing frame 801, a first upper load-bearing component provided in the middle of the upper load-bearing frame 801, and second upper load-bearing components provided on the left and right sides of the upper load-bearing frame 801. Among them, the first upper load-bearing component is located within the first upper mounting gap A; the second upper load-bearing component is located within the second upper mounting gap B; among them,

[0047] The first upper load-bearing component includes multiple groups of first upper load-bearing rollers 802 provided in the middle of the upper load-bearing frame 801. The multiple groups of first upper load-bearing rollers 802 are arranged in a straight line and are all rotatably connected to the upper load-bearing frame 801; the upper ends of each group of first upper load-bearing rollers 802 are in contact with the lower surface of the first upper rail connecting piece 201, and the lower ends are in contact with the upper surface of the first middle rail connecting piece 301, so as to support the upper rail 2 to improve its load-bearing capacity, and at the same time, the friction between the upper rail 2 and the middle rail 3 can be reduced to guide the movement of the upper rail 2.

[0048] The second upper load-bearing component includes multiple groups of upper load-bearing balls 803 provided on both sides of the upper load-bearing frame 801. The multiple groups of upper load-bearing balls 803 are arranged in a straight line and are all installed on the upper load-bearing frame 801 through a universal joint structure; each group of upper load-bearing balls 803 is located within the second upper mounting gap B and is tangent to the arc-shaped block 304 and the arc-shaped groove 204; by providing the upper load-bearing balls 803, the upper rail 2 can be limited in the left-right and up-down directions, and at the same time, the friction between the upper rail 2 and the middle rail 3 can also be reduced.

[0049] See Figures 1 - 13 A lower load-bearing wheel set 9 is provided between the lower rail 4 and the middle rail 3. The lower load-bearing wheel set 9 includes a lower load-bearing frame 901, a first lower load-bearing component provided in the middle of the lower load-bearing frame 901, and second and third lower load-bearing components provided on both sides of the lower load-bearing frame 901. Among them, the first lower load-bearing component is located within the first lower mounting gap C; the second and third lower load-bearing components are located within the second lower mounting gap D; among them,

[0050] The first lower load-bearing component includes first lower load-bearing rollers 902 arranged on the lower side of the lower load-bearing frame 901; the first lower load-bearing rollers 902 are multiple groups, and the multiple groups of first lower load-bearing rollers 902 are arranged in a straight line and are rotatably connected to the lower load-bearing frame 901; the upper ends of each group of first lower load-bearing rollers 902 are in contact with the lower surface of the first middle rail connecting piece 301, and the lower ends are in contact with the upper surface of the first lower rail connecting piece 401;

[0051] The third lower load-bearing component includes third lower load-bearing rollers 903 arranged on the upper side of the lower load-bearing frame 901; the third lower load-bearing rollers 903 are all multiple groups, and the multiple groups of third lower load-bearing rollers 903 are arranged in a straight line and are rotatably connected to the lower load-bearing frame 901; the upper ends of the third lower load-bearing rollers 903 are in contact with the lower surface of the third lower rail connecting piece 403, and the lower ends are in contact with the upper surface of the third middle rail connecting piece 303;

[0052] By providing the first lower load-bearing rollers 902 and the third lower load-bearing rollers 903, the middle rail 3 can be supported and guided (i.e., the friction between the middle rail 3 and the lower rail 4 can be reduced);

[0053] The second lower load-bearing component includes second lower load-bearing rollers 904 arranged on the other side of the lower load-bearing frame 901; the second lower load-bearing rollers 904 are rotatably connected in the lower load-bearing frame 901, and the axial direction of the second lower load-bearing rollers 904 is perpendicular to the axial direction of the first lower load-bearing rollers 902 or the third lower load-bearing rollers 903; the wheel surfaces of the second lower load-bearing rollers 904 are respectively in contact with the outer side surface of the second middle rail connecting piece 302 and the inner side surface of the second lower rail connecting piece 402; by providing the second load-bearing component, the position of the middle rail 3 can be limited during the sliding process of the middle rail 3, preventing the middle rail 3 from shaking left and right during the sliding process; and in combination with the upper load-bearing balls 803, the upper rail 2 is limited in the left-right and up-down directions, so as to ensure that the improved three-section synchronous slide rail of the present invention will not shake left and right during the working process and has better stability.

[0054] See Figures 1 - 13 , both the upper load-bearing wheel group 8 and the lower load-bearing wheel group 9 are two groups, wherein, the upper load-bearing frames 801 between the two groups of upper load-bearing wheel groups 8 are connected by an upper connecting frame; the lower load-bearing frames 901 between the two groups of lower load-bearing wheel groups 9 are connected by a lower connecting frame.

[0055] See Figures 1 - 13, a gear-rack transmission mechanism is provided between the upper load-bearing frame 801 and the middle rail 3, and between the lower load-bearing frame 901 and the middle rail 3; wherein, the gear-rack transmission mechanism includes a first rack 5 provided on the upper connecting frame, a second rack 7 provided on the lower connecting frame, and a transmission gear 6 provided on the middle rail 3. The transmission gear 6 is rotatably connected to the middle rail 3, meshes with the first rack 5 at the upper end, and meshes with the second rack 7 at the lower end;

[0056] With the above arrangement, during the sliding process of the upper rail 2, due to the meshing relationship between the first rack 5 and the transmission gear 6, the first rack 5 will drive the transmission gear 6 to rotate. While the transmission gear 6 is rotating, since there is also a meshing relationship between the transmission gear 6 and the second rack 7, the middle rail 3 will also move relative to the lower rail 4; and the transmission ratio among the first rack 5, the transmission gear 6, and the second rack 7 is determined; therefore, every time the upper rail 2 moves a certain distance, the movement distance of the middle rail 3 is also determined and unique, thus making the movement of the improved three-section synchronous slide rail of the present invention more accurate.

[0057] See Figures 1 - 13 , both sides of the upper connecting frame and the lower connecting frame are respectively installed on the upper connecting frame and the lower connecting frame by means of snap connection, which can facilitate the installation and disassembly of the first rack 7 and the second rack 10; in addition, screw connection can also be adopted.

[0058] See Figures 1 - 13 , there are two sets of brackets 1, which are arranged at both ends of the lower end. Each set of brackets 1 is L-shaped. By using the brackets 1, the improved three-section synchronous slide rail of the present invention can be installed on furniture.

[0059] Embodiment 2

[0060] See Figure 14 , the difference between this embodiment and Embodiment 1 is that

[0061] The installation of the bracket 1 in this embodiment is different from that in Embodiment 1, that is, the upper rail in Embodiment 1 is used as the lower rail 4 in this embodiment; that is to say, the other components in Embodiment 1 except the bracket 1 are rotated 180 degrees and then installed on the bracket 1.

[0062] With the above arrangement, both the upper rail 2 and the lower rail 4 in this embodiment can be used as movable rails, and the installation is more convenient.

[0063] The above is a preferred embodiment of the present utility model. However, the embodiments of the present utility model are not limited to the above content. Any other changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be equivalent replacement methods and are all included in the protection scope of the present utility model.

Claims

1. An improved three-section synchronous slide rail, comprising a bracket, a lower rail, a middle rail and an upper rail arranged on the bracket, characterized in that: The upper rail comprises a first upper rail tab arranged horizontally and second upper rail tabs arranged on both sides of the first upper rail tab, wherein the second upper rail tabs on both sides extend vertically downward and are horizontally bent inward to form a third upper rail tab extending horizontally; The middle rail comprises a first middle rail joint piece arranged horizontally and second middle rail joint pieces arranged on both sides of the first middle rail joint piece, wherein the second middle rail joint pieces on both sides extend vertically downward and are horizontally bent outward to form a third middle rail joint piece extending horizontally; the second middle rail joint pieces on both sides are connected to the first middle rail joint piece through an arc block, one end of the arc block is connected to the first middle rail joint piece, and the other end is connected to the second middle rail joint piece; the third upper rail joint piece is provided with an arc groove, and the arc groove is concentric with the arc block; The lower rail comprises a first lower rail tab arranged horizontally and second lower rail tabs arranged on both sides of the first lower rail tab, wherein the second lower rail tabs on both sides extend vertically upward and are horizontally bent inward to form a third lower rail tab extending horizontally; An upper load-bearing wheel group is arranged between the upper rail and the middle rail, and a lower load-bearing wheel group is arranged between the lower rail and the middle rail.

2. The improved three-section synchronous slide rail according to claim 1, characterized in that: The gap between the first middle rail joint and the first upper rail joint forms a first upper installation gap; the gap between the arc block and the arc groove of the third upper rail joint forms a second upper installation gap; the gap between the second middle rail joints on both sides of the middle rail and the first lower rail joint forms a first lower installation gap; the gap between the third middle rail joint and the third lower rail joint forms a second lower installation gap.

3. The improved three-section synchronous slide rail according to claim 2, characterized in that: The upper load-bearing wheel group includes an upper load-bearing frame, a first upper load-bearing component arranged in the middle of the upper load-bearing frame, and a second upper load-bearing component arranged on the left and right sides of the upper load-bearing frame, wherein the first upper load-bearing component is located in the first upper installation gap; the second upper load-bearing component is located in the second upper installation gap.

4. The improved three-section synchronous slide rail according to claim 3, characterized in that: The first upper load-bearing component includes a first upper load-bearing roller arranged in the middle part of the upper load-bearing frame, the first upper load-bearing roller is rotatably connected to the upper load-bearing frame, the upper end of the first upper load-bearing roller contacts the lower surface of the first upper rail joint piece, and the lower end contacts the upper surface of the first middle rail joint piece.

5. The improved three-section synchronous slide rail according to claim 4, characterized in that: The second upper load-bearing component includes multiple groups of upper load-bearing balls arranged on both sides of the upper load-bearing frame, the multiple groups of upper load-bearing balls are arranged in a straight line, and are all installed on the upper load-bearing frame through a universal joint structure; each group of upper load-bearing balls is located in the two upper installation gaps and is tangent to the arc block and the arc groove.

6. The improved three-section synchronous slide rail according to claim 2, characterized in that: The lower load-bearing wheel group includes a lower load-bearing frame, a first lower load-bearing component arranged in the middle of the lower load-bearing frame, and a second lower load-bearing component and a third lower load-bearing component arranged on the left and right sides of the lower load-bearing frame, wherein the first lower load-bearing component is located in the first lower installation gap; the second lower load-bearing component and the third lower load-bearing component are both located in the second lower installation gap.

7. The improved three-section synchronous slide rail according to claim 6, characterized in that: The first lower load-bearing component includes a first lower load-bearing roller arranged on the lower side of the lower load-bearing frame; the first lower load-bearing rollers are divided into multiple groups, and the multiple groups of first lower load-bearing rollers are arranged in a straight line and rotatably connected to the lower load-bearing frame; the upper end of each group of first lower load-bearing rollers contacts the lower surface of the first middle rail joint piece, and the lower end contacts the upper surface of the first lower rail joint piece.

8. The improved three-section synchronous slide rail according to claim 7, characterized in that: The second lower load-bearing component includes second lower load-bearing rollers arranged on both sides of the lower load-bearing frame; the second lower load-bearing rollers are rotatably connected to the lower load-bearing frame, and the axial direction of the second lower load-bearing rollers is perpendicular to the axial direction of the first lower load-bearing rollers; the wheel surfaces of the second lower load-bearing rollers are respectively in contact with the outer side surface of the second middle rail joint and the inner side surface of the second lower rail joint.

9. The improved three-section synchronous slide rail according to claim 8, characterized in that: The third lower load-bearing component includes a third lower load-bearing roller arranged on the upper side of the lower load-bearing frame, wherein the third lower load-bearing rollers are in multiple groups, the multiple groups of third lower load-bearing rollers are arranged in a straight line, and are rotatably connected to the lower load-bearing frame; the upper end of the third lower load-bearing roller contacts the lower surface of the third lower rail connecting piece, and the lower end contacts the upper surface of the third middle rail connecting piece.

10. The improved three-section synchronous slide rail according to claim 1, characterized in that: The brackets are in two groups, and the two groups of brackets are connected to the upper rail or the lower rail; when the upper rail is connected to the brackets, the lower rail is a movable rail; when the lower rail is connected to the brackets, the upper rail is a movable rail.

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