Three-section drawing type sliding rail stable in sliding

Abstract

The utility model discloses a three-section drawing type sliding rail stable in sliding. The three-section drawing type sliding rail comprises a support, a lower rail, a middle rail and an upper rail. A first upper mounting gap is formed between the groove in the middle rail and the inner top surface of the upper rail; second upper mounting gaps are respectively formed between the left and right sides of the upper end of the middle rail and the left and right sides of the upper rail; a first lower mounting gap is formed between the bottom of the middle rail and the inner bottom surface of the lower rail; a second lower mounting gap and a third lower mounting gap are respectively formed between the left and right sides of the lower end and the left and right sides of the lower rail; an upper bearing wheel set is arranged between the upper rail and the middle rail, a lower bearing wheel set is arranged between the lower rail and the middle rail, a first upper bearing assembly in the upper bearing wheel set is located in the first upper mounting gap, and a second upper bearing assembly and a third upper bearing assembly are located in the second upper mounting gap; a first lower bearing assembly in the lower bearing wheel set is located in the first lower mounting gap, and a second lower bearing assembly and a third lower bearing assembly are located in the second lower mounting gap and the third lower mounting gap correspondingly. The three-section drawing type sliding rail is better in bearing performance and stability.

Description

Technical Field

[0001] The utility model belongs to the field of furniture, and particularly relates to a three - section draw - type slide rail with stable sliding. 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 body. The main components of the three - section hidden slide rail include a lower rail, an upper rail, and a middle rail arranged between the two. For example, the utility model patent with the authorization announcement number CN208941351 U discloses "a three - section drawer slide rail structure". The three - section drawer slide rail structure 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 part one, and both ends of the upper flat plate part one are vertically bent downward to form a left vertical part one and a right vertical part one. Both the lower end of the right vertical part one and the lower end of the left vertical part one extend inwards with rounded corners. The middle rail includes an upper flat plate part two. Both ends of the upper flat plate part two are bent downward to form an upper left vertical part two and a right vertical part two. The right vertical part two is bent leftward to form a lower flat plate part two, and the lower flat plate part two is bent upward to form a lower left vertical part 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 support end of the lower rail is wrapped outside the lower cage. It has strong stability, smooth, flexible, smooth, and unobstructed sliding, and is not easy to shake.

[0003] However, the right vertical part two of the middle rail of the above - mentioned three - section drawer slide rail structure is 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 three - section drawer slide rail structure. Summary of the Utility Model

[0004] The utility model provides a three - section draw - type slide rail with stable sliding to overcome the deficiencies of the prior art. The three - section draw - type 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] A three - section draw - type slide rail with stable sliding, including a bracket, a lower rail arranged on the bracket, a middle rail arranged on the lower rail, and an upper rail arranged on the middle rail. Among them,

[0007] A groove is arranged at the middle position of the middle rail; the groove extends along the length direction of the middle rail; a first upper installation gap is formed between the groove and the inner top surface of the upper rail; the left and right sides of the upper end of the middle rail extend horizontally outwards, and a second upper installation gap is respectively formed between the left and right sides of the upper rail; a first lower installation gap is formed between the bottom of the middle rail and the inner bottom surface of the lower rail, and a second lower installation gap and a third lower installation gap are respectively formed between the left and right sides of the lower end of the middle rail and the left and right sides of the lower rail;

[0008] 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, where

[0009] 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 a second upper load-bearing component and a third upper load-bearing component arranged on the left and right sides of the upper load-bearing frame respectively. Among them, the first upper load-bearing component is located within the first upper installation gap; both the second upper load-bearing component and the third upper load-bearing component are located within the second upper installation gap;

[0010] The lower load-bearing wheel set 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 respectively. Among them, the first lower load-bearing component is located within the first lower installation gap and the third lower installation gap; the second lower load-bearing component and the third lower load-bearing component are respectively located within the second lower installation gap and the third lower installation gap.

[0011] Preferably, 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 bend horizontally inward to form a horizontally extending third upper rail connecting piece.

[0012] Preferably, the lower rail includes a horizontally arranged first lower rail connecting piece 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 bend horizontally inward to form a horizontally extending third lower rail connecting piece.

[0013] Preferably, the middle rail includes a horizontally arranged first middle rail connecting piece 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 upward and bend horizontally outward to form a horizontally extending third middle rail connecting piece; among them, a fourth middle rail connecting piece is arranged between the second middle rail connecting piece on the right side and the first middle rail connecting piece. The fourth middle rail connecting piece is attached to the first middle rail connecting piece, and one end of it is connected to the bottom of the second middle rail connecting piece, and the other end is arc-connected to the first middle rail connecting piece; the connecting section between the second middle rail connecting piece on the left side and the first middle rail connecting piece is a double arc section, and the double arc section includes an inwardly concave inner arc section and an outwardly convex outer arc section.

[0014] Preferably, the first upper load-bearing component includes multiple groups of first upper load-bearing rollers arranged in the middle of the upper load-bearing frame. The multiple groups of first upper load-bearing rollers are arranged in a straight line and are all rotatably connected to the upper load-bearing frame; the upper ends of each group of first upper load-bearing rollers are in contact with the lower surface of the first upper rail connecting piece, and the lower ends are in contact with the upper surface of the first middle rail connecting piece.

[0015] Preferably, the second upper load-bearing component includes second upper load-bearing rollers disposed on the left and right sides of the upper load-bearing frame; the second upper load-bearing rollers are rotatably connected to the left and right sides of the upper load-bearing frame, and the axial direction of the second upper load-bearing rollers is perpendicular to the axial direction of the first upper load-bearing rollers; the wheel surfaces of the second upper load-bearing rollers are respectively in contact with the outer side surface of the second middle rail connecting piece and the inner side surface of the second upper rail connecting piece.

[0016] Preferably, the third upper load-bearing component includes multiple groups of third upper load-bearing rollers disposed on the left and right sides of the upper load-bearing frame, the multiple groups of third upper load-bearing rollers are arranged in a straight line, and are all rotatably connected to the upper load-bearing frame; the upper ends of each group of third upper load-bearing rollers are in contact with the lower surface of the third middle rail connecting piece, and the lower ends are in contact with the upper surface of the third upper rail connecting piece.

[0017] Preferably, the first lower load-bearing component includes first lower load-bearing rollers disposed on the lower side of the lower load-bearing frame and second lower load-bearing rollers disposed on the upper side of the lower load-bearing frame, wherein the first lower load-bearing rollers are located in the first lower installation gap, and the second lower load-bearing rollers are located in the third lower installation gap; both the first lower load-bearing rollers and the second lower load-bearing rollers are multiple groups, the multiple groups of first lower load-bearing rollers and the multiple groups of second lower load-bearing rollers are both arranged in a straight line, and are all rotatably connected to the lower load-bearing frame; the upper ends of each group of first lower load-bearing rollers are in contact with the lower surface of the first middle rail connecting piece, and the lower ends are in contact with the upper surface of the first lower rail connecting piece; the upper ends of the second lower load-bearing rollers are in contact with the lower surface of the third lower rail connecting piece, and the lower ends are in contact with the upper surface of the fourth middle rail connecting piece.

[0018] Preferably, the second lower load-bearing component includes multiple groups of lower load-bearing balls disposed on one side of the lower load-bearing frame, the multiple groups of lower load-bearing balls are arranged in a straight line, and are all installed on the lower load-bearing frame through a universal joint structure; each group of lower load-bearing balls is located in a second lower installation gap formed by the outer arc section, the second lower rail connecting piece on the left side and the third lower rail connecting piece on the left side and matching the lower load-bearing balls.

[0019] Preferably, the third lower load-bearing component includes third lower load-bearing rollers disposed on the other side of the lower load-bearing frame; the third lower load-bearing rollers are rotatably connected to the side of the lower load-bearing frame opposite to the lower load-bearing balls, and the axial direction of the third lower load-bearing rollers is perpendicular to the axial direction of the first lower load-bearing rollers or the second lower load-bearing rollers; the wheel surfaces of the third lower load-bearing rollers are respectively in contact with the outer side surface of the second middle rail connecting piece and the inner side surface of the second lower rail connecting piece.

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

[0021] 1. In the middle rail of the three - section pull - out slide rail of the present utility model, a groove is provided. That is to say, the middle rail adopts a structure with vertical supports on both sides (i.e., vertical support structures are provided on both sides of the groove). Compared with the single - side vertical support structure in the prior art, the middle rail in the present utility model has stronger bending resistance, and correspondingly, its load - bearing capacity is also stronger.

[0022] 2. A first upper installation gap and two groups of second upper installation gaps are provided between the upper rail and the middle rail of the three - section pull - out slide rail of the present utility model, and a first lower installation gap, a second lower installation gap, and a third lower installation gap are provided between the middle rail and the lower rail. In this way, the first upper load - bearing component, the second upper load - bearing component, and the third upper load - bearing component of the upper load - bearing wheel set can be respectively installed in the first lower installation gap and the second lower installation gap; and the first lower load - bearing component, the second lower load - bearing component, and the third lower load - bearing component of the lower load - bearing wheel set can be respectively installed in the first lower installation gap, the second lower installation gap, and the third lower installation gap. Therefore, during the sliding process of the upper rail and the middle rail, each load - bearing component in the upper load - bearing wheel set and each load - bearing component in the lower load - bearing wheel set can limit, support, and guide the movement of the upper rail and the middle rail, thereby improving the stability and load - bearing capacity of the three - section pull - out slide rail of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural view of the three - section pull - out slide rail with stable sliding of the present utility model.

[0024] Figure 2 It is a side view (cross - sectional view) of the first specific embodiment of the three - section pull - out slide rail with stable sliding of the present utility model.

[0025] Figure 3 It is an exploded view of the three - section pull - out slide rail with stable sliding of the present utility model.

[0026] Figure 4 It is a schematic view of the state when the three - section pull - out slide rail with stable sliding of the present utility model is opened.

[0027] Figure 5 It is a schematic view of the state when the three - section pull - out slide rail with stable sliding of the present utility model is closed.

[0028] Figure 6 It is an installation schematic view of the middle rail, the transmission gear, and the load - bearing and guiding wheel set.

[0029] Figure 7 It is a schematic structural view of the load - bearing and guiding wheel set.

[0030] Figure 8 It is a schematic structural view of the upper load - bearing wheel set and the first rack.

[0031] Figure 9 It is a schematic structural view of the upper load-bearing wheel set.

[0032] Figure 10 It is a side view of the upper load-bearing wheel set.

[0033] Figure 11 It is a schematic structural view of the lower load-bearing wheel set and the second rack.

[0034] Figure 12 It is a schematic structural view of the lower load-bearing wheel set of the first type.

[0035] Figure 13 It is a schematic structural view of the lower load-bearing wheel set of the second type.

[0036] Figure 14 It is a schematic position view 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.

[0037] Figure 15 It is a cross-sectional view of the upper rail.

[0038] Figure 16 It is a cross-sectional view of the middle rail.

[0039] Figure 17 It is a cross-sectional view of the lower rail.

[0040] Figure 18 It is a side view (cross-sectional view) of the second specific embodiment of the three-section pull-out slide rail with stable sliding of the present utility model. Specific Embodiment

[0041] The present utility model will be further described in detail below in conjunction with embodiments and the accompanying drawings, but the embodiments of the present utility model are not limited thereto.

[0042] Embodiment 1

[0043] Refer to Figures 1 - 17 , the three-section hidden synchronous stable slide rail of the present invention includes a bracket 1, a lower rail 4 provided on the bracket 1, a middle rail 3 provided on the lower rail 4, and an upper rail 2 provided on the middle rail 3.

[0044] Refer to Figures 1 - 17 , the upper rail 2 includes a first upper rail connecting piece 201 arranged horizontally and second upper rail connecting pieces 202 arranged on both sides of the first upper rail connecting piece 201, wherein the second upper rail connecting pieces 202 on both sides extend vertically downward and are horizontally bent inward to form a horizontally extending third upper rail connecting piece 203; wherein, 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.

[0045] 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.

[0046] See Figures 1 - 17 , 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;

[0047] 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.

[0048] 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.

[0049] See Figures 1 - 17 , 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 upward 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, a fourth middle rail connecting piece 304 is provided between the second middle rail connecting piece 302 on the right side and the first middle rail connecting piece 301. The fourth middle rail connecting piece 304 is attached to the first middle rail connecting piece 301, and one end thereof is connected to the bottom of the second middle rail connecting piece 302 (a fillet or chamfer can be provided at the connection), and the other end is arc-connected to the first middle rail connecting piece 301; the connecting section between the second middle rail connecting piece 302 on the left side and the first middle rail connecting piece 301 is a double arc section 305, and the double arc section 305 includes an inwardly concave inner arc section and an outwardly convex outer arc section;

[0050] In this embodiment, a groove is provided at the middle position of the middle rail 3 (i.e., the gap between the second middle rail connecting pieces 302 on both sides forms the groove); the groove extends along the length direction of the middle rail 3; a first upper mounting gap A is formed between the groove and the inner top surface of the upper rail 2 (i.e., the gap between the groove and the first upper rail connecting piece 201 forms the first upper mounting gap A); the left and right sides at the upper end of the middle rail 2 extend horizontally outwards and respectively form a second upper mounting gap B with the left and right sides of the upper rail 2 (i.e., the gap between the third middle rail connecting piece 303 and the third upper rail connecting piece 203 forms the second upper mounting gap B); the bottom of the middle rail 3 forms a first lower mounting gap C with the inner bottom surface of the lower rail 4 (i.e., the gap between the first middle rail connecting piece 301, the first lower rail connecting piece 401 and the second lower rail connecting pieces 402 on both sides forms the first lower mounting gap C), and a second lower mounting gap D and a third lower mounting gap E are respectively formed between the left and right sides at the lower end of the middle rail 3 and the left and right sides of the lower rail 4 (i.e., the gap between the third lower rail connecting piece 403 on the left side and the double arc section 305 of the second middle rail connecting piece 302 and the first middle rail connecting piece 301 on the left side constitutes the second lower mounting gap D), and the gap above the third lower rail connecting piece 403 on the right side and the fourth middle rail connecting piece 304 constitutes the third lower mounting gap E).

[0051] See Figures 1 - 17 , 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 and third 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 and third upper load-bearing components are both located within the second upper mounting gap B; among them,

[0052] 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 end of each group of first upper load-bearing rollers 802 contacts the lower surface of the first upper rail connecting piece 201, and the lower end contacts the upper surface of the first middle rail connecting piece 301, which is used to support the upper rail 2 to improve its bearing capacity, and at the same time, it can also reduce the friction between the upper rail 2 and the middle rail 3 to guide the movement of the upper rail 2;

[0053] The second upper load-bearing component includes second upper load-bearing rollers 804 arranged on the left and right sides of the upper load-bearing frame 801; the second upper load-bearing rollers 804 are rotatably connected to the left and right sides of the upper load-bearing frame 801, and the axial direction of the second upper load-bearing rollers 804 is perpendicular to the axial direction of the first upper load-bearing rollers 802; the wheel surfaces of the second upper load-bearing rollers 804 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 upper rail connecting piece 202; by providing the second upper load-bearing rollers 804, the position of the upper rail 2 can be limited during the sliding process of the upper rail 2, preventing the upper rail 2 from swaying left and right during the sliding process;

[0054] The third upper load-bearing component includes multiple groups of third upper load-bearing rollers 803 arranged on the left and right sides of the upper load-bearing frame 801. The multiple groups of third upper load-bearing rollers 803 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 third upper load-bearing rollers 803 are in contact with the lower surface of the third middle rail connecting piece 303, and the lower ends are in contact with the upper surface of the third upper rail connecting piece 203.

[0055] See Figures 1 - 17 , 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 a second lower load-bearing component and a third lower load-bearing component respectively provided on the left and right sides of the lower load-bearing frame 901. Among them, the first lower load-bearing component is located in the first lower installation gap C and the third lower installation gap E; the second lower load-bearing component and the third lower load-bearing component are respectively located in the second lower installation gap D and the third lower installation gap E; among them,

[0056] The first lower load-bearing component includes a first lower load-bearing roller 902 disposed on the lower side of the lower load-bearing frame 901 and a second lower load-bearing roller 903 disposed on the upper side of the lower load-bearing frame 901. Among them, the first lower load-bearing roller 902 is located within the first lower installation gap C, and the second lower load-bearing roller 903 is located within the third lower installation gap E; both the first lower load-bearing roller 902 and the second lower load-bearing roller 903 are provided in multiple groups. The multiple groups of first lower load-bearing rollers 902 and the multiple groups of second lower load-bearing rollers 903 are both arranged in a straight line and are all rotatably connected to the lower load-bearing frame 901; the upper end of each group of first lower load-bearing rollers 902 contacts the lower surface of the first middle rail connecting piece 301, and the lower end contacts the upper surface of the first lower rail connecting piece 401; the upper end of the second lower load-bearing roller 903 contacts the lower surface of the third lower rail connecting piece 403, and the lower end contacts the upper surface of the fourth middle rail connecting piece 304; similarly, by providing the first lower load-bearing roller 902 and the second lower load-bearing roller 903, the middle rail can be supported and guided (i.e., the friction between the middle rail and the lower rail can be reduced).

[0057] The second lower load-bearing component includes multiple groups of lower load-bearing balls 904 disposed on one side of the lower load-bearing frame 901. The multiple groups of lower load-bearing balls 904 are arranged in a straight line and are all installed on the lower load-bearing frame 901 through a universal joint structure to enable each group of lower load-bearing balls 904 to roll freely; each group of lower load-bearing balls 904 is located within a second lower installation gap D formed by the outer arc segment, the second lower rail connecting piece 402 on the left side, and the third lower rail connecting piece 403 and matching the lower load-bearing balls 904.

[0058] The third lower load-bearing component includes a third lower load-bearing roller 905 disposed on the other side of the lower load-bearing frame 901; the third lower load-bearing roller 905 is rotatably connected to the side of the lower load-bearing frame 901 opposite to the lower load-bearing balls 904, and the axial direction of the third lower load-bearing roller 905 is perpendicular to the axial direction of the first lower load-bearing roller 902 or the second lower load-bearing roller 903; the wheel surface of the third lower load-bearing roller 905 contacts 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 respectively.

[0059] By providing the second load-bearing component and the third load-bearing component, the position of the middle rail 3 can be limited during the sliding process of the middle rail 3 to prevent the middle rail 3 from swaying left and right during the sliding process; and in combination with the second upper load-bearing roller 804, the upper rail 2 is limited in the left-right direction, so as to ensure that the three-section hidden synchronous stable slide rail of the present invention will not sway left and right during the working process and has better stability.

[0060] See Figures 1 - 17, a load-bearing guide wheel set 5 is installed at the end of the middle rail 3 close to the lower rail 4. The load-bearing guide wheel set 5 includes a load-bearing guide frame 501 and load-bearing guide wheels 502 arranged on the load-bearing guide frame 501. Among them, the load-bearing guide wheels 502 are rotatably connected to the load-bearing guide frame 501, and the wheel surfaces of the load-bearing guide wheels 502 are in contact with the lower surfaces of the first upper rail connecting pieces 201. By setting the above structure, it can also be used to guide and support the movement of the upper rail 2.

[0061] See Figures 1 - 17 , both the upper load-bearing wheel set 8 and the lower load-bearing wheel set 9 are two groups. Among them, the upper load-bearing frames 801 in the two groups of upper load-bearing wheel sets 8 are connected by an upper connecting frame; a limiting block 805 is arranged in the middle of the upper connecting frame. The width of the limiting block 805 is greater than the width of the groove of the middle rail 3 to prevent the upper connecting frame from entering the groove of the middle rail 3; the lower load-bearing frames 901 in the two groups of lower load-bearing wheel sets 9 are connected by a lower connecting frame 906.

[0062] See Figures 1 - 17 , a gear-rack transmission mechanism is arranged 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; among them, the gear-rack transmission mechanism includes a first rack 7 arranged on the upper connecting frame, a second rack 10 arranged on the lower connecting frame 906, and a transmission gear 6 arranged on the middle rail 3. Among them, the transmission gear 6 is rotatably connected to the middle rail 3, and the upper end is meshed with the first rack 7, and the lower end is meshed with the second rack 10;

[0063] Through the above settings, during the sliding process of the upper rail 2, due to the meshing relationship between the first rack 7 and the transmission gear 6, therefore, the first rack 7 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 10, therefore the middle rail 3 will also move relative to the lower rail 4; and the transmission ratio between the first rack 7, the transmission gear 6 and the second rack 10 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 three-section hidden synchronous stable slide rail of the present invention more accurate.

[0064] See Figures 1 - 17 , both sides of the upper connecting frame 805 and the lower connecting frame 906 are respectively installed on the upper connecting frame 805 and the lower connecting frame 906 by means of snap connection, which can facilitate the installation and disassembly of the first rack 7 and the second rack 10;

[0065] In addition, the screw connection method can also be adopted.

[0066] See Figures 1 - 17 , there are two sets of the brackets 1, and the two sets of brackets 1 are arranged at both ends of the lower end. Each set of brackets 1 is L-shaped. By using the brackets 1, the three-section hidden synchronous stable slide rail of the present invention can be installed on furniture.

[0067] Embodiment 2

[0068] See Figure 18 , the difference between this embodiment and Embodiment 1 is that

[0069] 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 except the bracket 1 in Embodiment 1 are rotated 180 degrees and then installed on the bracket 1.

[0070] Through the above settings, 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.

[0071] The above is the preferred embodiment of the present utility model, but the embodiments of the present utility model are not limited to the above content. Any other changes, modifications, substitutions, combinations, and 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. A three-section pull-out slide rail with stable sliding, comprising a bracket, a lower rail arranged on the bracket, a middle rail arranged on the lower rail, and an upper rail arranged on the middle rail, characterized in that: A groove is provided in the middle position of the middle rail; the groove extends along the length direction of the middle rail; a first upper installation gap is formed between the groove and the inner top surface of the upper rail; the left and right sides of the upper end of the middle rail extend horizontally outward, and form a second upper installation gap with the left and right sides of the upper rail respectively; a first lower installation gap is formed between the bottom of the middle rail and the inner bottom surface of the lower rail, and a second lower installation gap and a third lower installation gap are formed between the left and right sides of the lower end of the middle rail and the left and right sides of the lower rail respectively; 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, wherein: The upper load-bearing wheel assembly includes an upper load-bearing frame, a first upper load-bearing assembly arranged in the middle of the upper load-bearing frame, and a second upper load-bearing assembly and a third upper load-bearing assembly arranged on the left and right sides of the upper load-bearing frame, wherein the first upper load-bearing assembly is located in the first upper installation gap; the second upper load-bearing assembly and the third upper load-bearing assembly are both located in the second upper installation gap; 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 respectively 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 and the third lower installation gap; the second lower load-bearing component and the third lower load-bearing component are respectively located in the second lower installation gap and the third lower installation gap.

2. The three-section pull-out slide rail with stable sliding according to claim 1, characterized in that: The upper rail includes 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.

3. The three-section pull-out slide rail with stable sliding according to claim 2, characterized in that: 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 bend horizontally inward to form a third lower rail tab extending horizontally.

4. The three-section pull-out slide rail with stable sliding according to claim 3, characterized in that: The middle rail includes 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 upward and are horizontally bent outward to form a third middle rail joint piece extending horizontally; wherein a fourth middle rail joint piece is arranged between the second middle rail joint piece on the right side and the first middle rail joint piece, the fourth middle rail joint piece is attached to the first middle rail joint piece, and one end thereof is connected to the bottom of the second middle rail joint piece, and the other end is connected to the arc of the first middle rail joint piece; the connecting section between the second middle rail joint piece on the left side and the first middle rail joint piece is a double arc section, and the double arc section includes an inner arc section recessed inwardly and an outer arc section protruding outwardly.

5. The three-section pull-out slide rail with stable sliding according to claim 4, characterized in that: The first upper load-bearing component includes multiple groups of first upper load-bearing rollers arranged in the middle part of the upper load-bearing frame, the multiple groups of first upper load-bearing rollers are arranged in a straight line and are rotatably connected to the upper load-bearing frame; the upper end of each group of first upper load-bearing rollers 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.

6. The three-section pull-out slide rail with stable sliding according to claim 5, characterized in that: The second upper load-bearing component includes second upper load-bearing rollers arranged on the left and right sides of the upper load-bearing frame; the second upper load-bearing rollers are rotatably connected to the left and right sides of the upper load-bearing frame, and the axial direction of the second upper load-bearing roller is perpendicular to the axial direction of the first upper load-bearing roller; the wheel surface of the second upper load-bearing roller is in contact with the outer side surface of the second middle rail joint and the inner side surface of the second upper rail joint respectively.

7. The three-section pull-out slide rail with stable sliding according to claim 6, characterized in that: The third upper load-bearing component includes multiple groups of third upper load-bearing rollers arranged on the left and right sides of the upper load-bearing frame, the multiple groups of third upper load-bearing rollers are arranged in a straight line and are rotatably connected to the upper load-bearing frame; the upper end of each group of third upper load-bearing rollers contacts the lower surface of the third middle rail joint, and the lower end contacts the upper surface of the third upper rail joint.

8. The three-section pull-out slide rail with stable sliding according to claim 7, 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 and a second lower load-bearing roller arranged on the upper side of the lower load-bearing frame, wherein the first lower load-bearing roller is located in the first lower installation gap, and the second lower load-bearing roller is located in the third lower installation gap; the first lower load-bearing roller and the second lower load-bearing roller are both in multiple groups, and the multiple groups of first lower load-bearing rollers and the multiple groups of second lower load-bearing rollers are all 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 joint, and the lower end contacts the upper surface of the first lower rail joint; the upper end of the second lower load-bearing roller contacts the lower surface of the third lower rail joint, and the lower end contacts the upper surface of the fourth middle rail joint.

9. The three-section pull-out slide rail with stable sliding according to claim 8, characterized in that: The second lower load-bearing component includes multiple groups of lower load-bearing balls arranged on one side of the lower load-bearing frame, the multiple groups of lower load-bearing balls are arranged in a straight line, and are all installed on the lower load-bearing frame through a universal joint structure; each group of lower load-bearing balls is located in a second lower installation gap formed by the outer arc segment, the second lower rail connector on the left side and the third lower rail connector on the left side and matching the lower load-bearing balls.

10. The three-section pull-out slide rail with stable sliding according to claim 9, characterized in that: The third lower load-bearing component includes a third lower load-bearing roller arranged on the other side of the lower load-bearing frame; the third lower load-bearing roller is rotatably connected to the side of the lower load-bearing frame opposite to the lower load-bearing ball, and the axial direction of the third lower load-bearing roller is perpendicular to the axial direction of the first lower load-bearing roller or the second lower load-bearing roller; the wheel surface of the third lower load-bearing roller is in contact with the outer side surface of the second middle rail joint and the inner side surface of the second lower rail joint respectively.

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