Three-section drawing type sliding rail

Abstract

The utility model discloses a three-section drawing type slide rail, which has the advantages of better bearing performance and stability, and comprises a bracket, a lower rail, a middle rail and an upper rail, the upper rail comprises a first upper rail connecting piece, a second upper rail connecting piece and a third upper rail connecting piece; the second upper rail connecting piece vertically extends downwards and is horizontally bent inwards to form a fourth upper rail connecting piece; the third upper rail connecting piece vertically extends downwards; the lower rail comprises a first lower rail connecting piece, a second lower rail connecting piece and a third lower rail connecting piece; the second lower rail connecting piece vertically extends upwards and is horizontally bent inwards to form a fourth lower rail connecting piece; the third lower rail connecting piece vertically extends upwards and is horizontally bent inwards to form a fifth lower rail connecting piece; the middle rail comprises a first middle rail connecting piece, a second middle rail connecting piece and a third middle rail connecting piece; the second middle rail connecting piece vertically extends upwards and is horizontally bent outwards to form a fourth middle rail connecting piece; the third middle rail connecting piece vertically extends downwards; an arc-shaped or flat-plate-shaped fifth middle rail connecting piece is arranged between the second middle rail connecting piece and the first middle rail connecting piece.

Description

Technical Field

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

[0002] The three - section slide rail is a commonly used furniture hardware and is widely used in furniture with drawers. The pull - out distance of the three - section slide rail is longer than that of the two - section slide rail, which can make the drawer be fully pulled out, so it is more practical. The three - section slide rail mainly consists of a fixed rail, an intermediate rail and a movable rail. Rolling elements are respectively arranged between the fixed rail and the intermediate rail, and between the intermediate rail and the movable rail to ensure smooth sliding. The rolling elements are installed on a cage. Usually, a gear is also provided on the intermediate rail to cooperate with the racks on the two groups of rolling - element cages to ensure the synchronism of the pulling and pushing movements of the intermediate rail and the movable rail.

[0003] However, the load - bearing capacity of the existing three - section slide rails still needs to be improved. And when the moving speed of the drawer is too fast, it is easy to shake in the left - right or up - down directions, resulting in unsmooth and unstable sliding in and out of the drawer. Therefore, the stability of the existing three - section slide rails also needs to be further improved. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the existing technology, the utility model provides a three - section pull - out slide rail, and the load - bearing performance and stability of the three - section pull - out slide rail are better.

[0005] The technical solution for the utility model to solve the above technical problems is as follows:

[0006] A three - section pull - out slide rail includes 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; 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;

[0007] The upper rail includes a horizontally arranged first upper - rail connecting piece, and a second upper - rail connecting piece and a third upper - rail connecting piece respectively arranged on both sides of the first upper - rail connecting piece. Among them, the second upper - rail connecting piece extends vertically downward and bends horizontally inward to form a horizontally extending fourth upper - rail connecting piece; the third upper - rail connecting piece extends vertically downward;

[0008] The lower rail includes a horizontally arranged first lower - rail connecting piece, and a second lower - rail connecting piece and a third lower - rail connecting piece arranged on both sides of the first lower - rail connecting piece. Among them, the second lower - rail connecting piece extends vertically upward and bends horizontally inward to form a fourth lower - rail connecting piece; the third lower - rail connecting piece extends vertically upward and bends horizontally inward to form a horizontally extending fifth lower - rail connecting piece;

[0009] The middle rail includes a first middle rail connecting piece arranged horizontally, and a second middle rail connecting piece and a third middle rail connecting piece respectively arranged on both sides of the first middle rail connecting piece. Among them, the second middle rail connecting piece extends vertically upward and bends horizontally outward to form a fourth middle rail connecting piece extending horizontally; the third middle rail connecting piece extends vertically downward; among them,

[0010] A fifth middle rail connecting piece is arranged between the second middle rail connecting piece and the first middle rail connecting piece. The fifth middle rail connecting piece fits on 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 fourth lower rail connecting piece is located above the fifth middle rail connecting piece and extends horizontally; or, a fifth middle rail connecting piece is arranged between the second middle rail connecting piece and the first middle rail connecting piece. The fifth middle rail connecting piece is arc-shaped, 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 fourth lower rail connecting piece is located above the fifth middle rail connecting piece, and the fourth lower rail connecting piece is also arc-shaped; the fifth middle rail connecting piece and the fourth lower rail connecting piece are coaxial.

[0011] Preferably, the height of the fourth lower rail connecting piece is higher than the height of the fifth lower rail connecting piece.

[0012] Preferably, the gaps between the fourth middle rail connecting piece, the second middle rail connecting piece, the second upper rail connecting piece and the fourth upper rail connecting piece form a first installation gap; the gaps between the first middle rail connecting piece, the second middle rail connecting piece, the first upper rail connecting piece and the third upper rail connecting piece form a second installation gap; the gaps between the fifth middle rail connecting piece, the second middle rail connecting piece, the second lower rail connecting piece and the fourth lower rail connecting piece form a third installation gap; the gap between the first middle rail connecting piece and the fifth lower rail connecting piece forms a fourth installation gap; the gaps between the first middle rail connecting piece, the third middle rail connecting piece, the first lower rail connecting piece and the second lower rail connecting piece form a fifth installation gap; the gap between the third middle rail connecting piece and the third lower rail connecting piece forms a sixth installation gap.

[0013] Preferably, the upper load-bearing wheel set includes an upper load-bearing frame, a first upper load-bearing component, a second upper load-bearing component and a third upper load-bearing component arranged in the middle of the upper load-bearing frame. Among them, the first upper load-bearing component is located in the second installation gap; the second upper load-bearing component is located in the first installation gap; the third upper load-bearing component has two groups and is respectively located in the first installation gap and the second installation gap.

[0014] Preferably, the first upper load-bearing component includes a first upper load-bearing roller disposed on one side 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.

[0015] Preferably, the second upper load-bearing component includes a second upper load-bearing roller disposed on the other side of the upper load-bearing frame. The axial direction of the second upper load-bearing roller is parallel to the axial direction of the first upper load-bearing roller, and it is rotatably connected to the upper load-bearing frame. The upper end of the second upper load-bearing roller contacts the lower surface of the fourth middle rail connecting piece, and the lower end contacts the upper surface of the fourth upper rail connecting piece.

[0016] Preferably, the third upper load-bearing component includes third upper load-bearing rollers disposed on the left and right sides of the upper load-bearing frame; the third 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 third upper load-bearing roller is perpendicular to the axial direction of the first upper load-bearing roller; among them, the wheel surface of the third upper load-bearing roller on the left contacts the left side surface of the second middle rail connecting piece and the inner side surface of the second upper rail connecting piece respectively; the wheel surface of the third upper load-bearing roller on the right contacts the right side surface of the second middle rail connecting piece and the inner side surface of the third upper rail connecting piece respectively.

[0017] Preferably, the lower load-bearing wheel set includes a lower load-bearing frame, a first lower load-bearing component, a second lower load-bearing component, a third lower load-bearing component, and a fourth lower load-bearing component disposed on the lower load-bearing frame. Among them, the first lower load-bearing component is disposed on the lower side of the lower load-bearing frame and is located within the fifth installation gap; the second lower load-bearing component is disposed on the left side of the lower load-bearing frame and is located within the third installation gap; the third lower load-bearing component is located on the left and right sides of the lower load-bearing frame and is located within the third installation gap and the fourth installation gap; the fourth lower load-bearing component is disposed on the right side of the lower load-bearing frame and is located within the sixth installation gap, where

[0018] The first lower load-bearing component includes a first lower load-bearing roller disposed on the lower side of the lower load-bearing frame; the first lower load-bearing roller is provided in multiple groups, 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 the first lower load-bearing roller 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;

[0019] The second lower load-bearing component includes a second lower load-bearing roller disposed at the upper left end of the lower load-bearing frame; the second lower load-bearing roller is rotatably connected in the lower load-bearing frame, and the axial direction of the second lower load-bearing roller is perpendicular to the axial direction of the first lower load-bearing roller; the wheel surfaces of the second lower load-bearing roller 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] The third lower load-bearing component includes third lower load-bearing rollers disposed at the upper ends of both sides of the lower load-bearing frame; 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; among them, the upper end of the third lower load-bearing roller on the left side is in contact with the lower surface of the fourth lower rail connecting piece, and the lower end is in contact with the upper surface of the fifth middle rail connecting piece; the upper end of the third lower load-bearing roller on the right side is in contact with the lower surface of the fifth lower rail connecting piece, and the lower end is in contact with the upper surface of the first middle rail connecting piece;

[0021] The fourth lower load-bearing component includes a fourth lower load-bearing roller disposed at the lower right end of the lower load-bearing frame; the fourth lower load-bearing roller is rotatably connected in the lower load-bearing frame, and the axial direction of the fourth lower load-bearing roller is perpendicular to the axial direction of the first lower load-bearing roller; the wheel surfaces of the fourth lower load-bearing roller are respectively in contact with the outer side surface of the third middle rail connecting piece and the inner side surface of the third lower rail connecting piece.

[0022] Preferably, the lower load-bearing wheel set includes a lower load-bearing frame, a first lower load-bearing component, a second lower load-bearing component, a third lower load-bearing component, and a fourth lower load-bearing component disposed on the lower load-bearing frame, wherein the first lower load-bearing component is disposed on the lower side of the lower load-bearing frame and is located within the fifth installation gap; the second lower load-bearing component is disposed on the left side of the lower load-bearing frame and is located within the third installation gap; the third lower load-bearing component is located on the right side of the lower load-bearing frame and is located within the fourth installation gap; the fourth lower load-bearing component is disposed on the right side of the lower load-bearing frame and is located within the sixth installation gap, wherein,

[0023] The first lower load-bearing component includes first lower load-bearing rollers 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 the first lower load-bearing roller is in contact with the lower surface of the first middle rail connecting piece, and the lower end is in contact with the upper surface of the first lower rail connecting piece;

[0024] The second lower load-bearing component includes lower load-bearing balls disposed at the upper left end of the lower load-bearing frame; the lower load-bearing balls are installed in the lower load-bearing frame through a universal joint structure, and the wheel surfaces of the lower load-bearing balls are respectively in contact with the outer side surface of the fifth middle rail connecting piece and the inner side surface of the fourth lower rail connecting piece;

[0025] The third lower load-bearing component includes third lower load-bearing rollers arranged at the upper right end of the lower load-bearing frame; 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 ends of the third lower load-bearing rollers are in contact with the lower surface of the fifth lower rail connecting piece, and the lower ends are in contact with the upper surface of the first middle rail connecting piece.

[0026] The fourth lower load-bearing component includes fourth lower load-bearing rollers arranged at the lower right end of the lower load-bearing frame; the fourth lower load-bearing rollers are rotatably connected in the lower load-bearing frame, and the axial direction of the fourth lower load-bearing rollers is perpendicular to the axial direction of the first lower load-bearing rollers; the wheel surfaces of the fourth lower load-bearing rollers are respectively in contact with the outer side surface of the third middle rail connecting piece and the inner side surface of the third lower rail connecting piece.

[0027] Preferably, a gear-rack transmission mechanism is provided between the upper load-bearing frame and the middle rail, and between the lower load-bearing frame and the middle rail.

[0028] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0029] By structurally improving the upper rail, the middle rail, and the lower rail of the three-section draw-type slide rail of the present utility model, the gaps between the upper rail, the middle rail, and the lower rail can be supported and limited by rollers or by balls, so as to support the upper rail and the middle rail during the sliding process and limit them in the up-down direction and the left-right direction, thereby improving the load-bearing capacity and working stability of the three-section draw-type slide rail of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural view of the three-section draw-type slide rail of the present utility model.

[0031] Figure 2 It is a side view (cross-sectional view) of the first specific embodiment of the three-section draw-type slide rail of the present utility model.

[0032] Figure 3 It is an exploded view of the first specific embodiment of the three-section draw-type slide rail of the present utility model.

[0033] Figure 4 It is a schematic view of the state when the three-section draw-type slide rail of the present utility model is opened.

[0034] Figure 5 It is a schematic view of the state when the three-section draw-type slide rail of the present utility model is closed.

[0035] Figure 6 It is a side view of the upper load-bearing wheel set.

[0036] Figure 7 Side view of the lower load-bearing wheel set.

[0037] Figure 8 Schematic diagram of the positions of the first installation gap, the second installation gap, the third installation gap, the fourth installation gap, the fifth installation gap, and the sixth installation gap.

[0038] Figure 9 Cross-sectional view of the upper rail.

[0039] Figure 10 Cross-sectional view of the middle rail.

[0040] Figure 11 Cross-sectional view of the lower rail.

[0041] Figure 12 Side view (cross-sectional view) of the second specific embodiment of the three-section draw-type slide rail of the present invention.

[0042] Figure 13 Exploded view of the second specific embodiment of the three-section draw-type slide rail of the present invention.

[0043] Figure 14 Side view of the upper load-bearing wheel set.

[0044] Figure 15 Side view of the lower load-bearing wheel set.

[0045] Figure 16 Schematic diagram of the positions of the first installation gap, the second installation gap, the third installation gap, the fourth installation gap, the fifth installation gap, and the sixth installation gap.

[0046] Figure 17 Cross-sectional view of the middle rail.

[0047] Figure 18 Cross-sectional view of the lower rail. Specific embodiments

[0048] The present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0049] Embodiment 1

[0050] See Figures 1-11 , the three-section draw-type 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. Among them, an upper load-bearing wheel set 8 is provided between the upper rail 2 and the middle rail 3, and a lower load-bearing wheel set 9 is provided between the lower rail 4 and the middle rail 3.

[0051] See Figures 1-11, the upper rail 2 includes a horizontally arranged first upper rail connecting piece 201, and a second upper rail connecting piece 202 and a third upper rail connecting piece 203 respectively arranged on both sides of the first upper rail connecting piece 201. Among them, the second upper rail connecting piece 202 extends vertically downward and bends horizontally inward to form a horizontally extending fourth upper rail connecting piece 204; the third upper rail connecting piece 203 extends vertically downward;

[0052] In addition, chamfers or rounded corners are provided between the first upper rail connecting piece 201 and the second upper rail connecting piece 202 and between the first upper rail connecting piece 201 and the third upper rail connecting piece 203; chamfers or rounded corners are also provided between the second upper rail connecting piece 202 and the fourth upper rail connecting piece 204.

[0053] In this embodiment, the first upper rail connecting piece 201, the second upper rail connecting piece 202, the third upper rail connecting piece 203, and the fourth upper rail connecting piece 204 can be manufactured by an integral molding process.

[0054] See Figures 1-11 , the lower rail 4 includes a horizontally arranged first lower rail connecting piece 401, and a second lower rail connecting piece 402 and a third lower rail connecting piece 403 arranged on both sides of the first lower rail connecting piece 401. Among them, the second lower rail connecting piece 402 extends vertically upward and bends horizontally inward to form a fourth lower rail connecting piece 404; the third lower rail connecting piece 403 extends vertically upward and bends horizontally inward to form a horizontally extending fifth lower rail connecting piece 405; in addition, chamfers or rounded corners are provided between the first lower rail connecting piece 401 and the second lower rail connecting piece 402 and between the first lower rail connecting piece 401 and the third lower rail connecting piece 403; chamfers or rounded corners are also provided between the second lower rail connecting piece 402 and the fourth lower rail connecting piece 404 and between the third lower rail connecting piece 403 and the fifth lower rail connecting piece 405.

[0055] In this embodiment, the first lower rail connecting piece 401, the second lower rail connecting piece 402, the third lower rail connecting piece 403, the fourth lower rail connecting piece 404, and the fifth lower rail connecting piece 405 can be manufactured by an integral molding process; among them, the height of the fourth lower rail connecting piece 404 is higher than the height of the fifth lower rail connecting piece 405.

[0056] See Figures 1-11, the middle rail 3 includes a horizontally arranged first middle rail connecting piece 301, and a second middle rail connecting piece 302 and a third middle rail connecting piece 303 respectively arranged on both sides of the first middle rail connecting piece 301. Among them, the second middle rail connecting piece 302 extends vertically upward and bends horizontally outward to form a horizontally extending fourth middle rail connecting piece 304; the fourth middle rail connecting piece 304 extends vertically downward; a fifth middle rail connecting piece 305 is arranged between the second middle rail connecting piece 302 and the first middle rail connecting piece 301. The fifth middle rail connecting piece 305 fits on the first middle rail connecting piece 301, one end of which is connected to the bottom of the second middle rail connecting piece 302, and the other end is arc-connected to the first middle rail connecting piece 301; the fourth lower rail connecting piece 404 is located above the fifth middle rail connecting piece 305 and extends horizontally.

[0057] See Figures 1-11 , a first installation gap A is formed by the gaps between the fourth middle rail connecting piece 304, the second middle rail connecting piece 302, the second upper rail connecting piece 202 and the fourth upper rail connecting piece 204; a second installation gap B is formed by the gaps between the first middle rail connecting piece 301, the second middle rail connecting piece 302, the first upper rail connecting piece 201 and the third upper rail connecting piece 203; a third installation gap C is formed by the gaps between the fifth middle rail connecting piece 305, the second middle rail connecting piece 302, the second lower rail connecting piece 402 and the fourth lower rail connecting piece 404; a fourth installation gap D is formed by the gap between the first middle rail connecting piece 301 and the fifth lower rail connecting piece 405; a fifth installation gap E is formed by the gaps between the first middle rail connecting piece 301, the third middle rail connecting piece 303, the first lower rail connecting piece 401 and the second lower rail connecting piece 402; a sixth installation gap F is formed by the gap between the third middle rail connecting piece 303 and the third lower rail connecting piece 403.

[0058] See Figures 1-11 , the upper load-bearing wheel set 8 includes an upper load-bearing frame 801, a first upper load-bearing component, a second upper load-bearing component and a third upper load-bearing component arranged in the middle of the upper load-bearing frame 801. Among them, the first upper load-bearing component is located in the second installation gap B; the second upper load-bearing component is located in the first installation gap A; the third upper load-bearing component has two groups and is respectively located in the first installation gap A and the second installation gap B, where

[0059] The first upper load-bearing component includes a first upper load-bearing roller 802 arranged on one side of the upper load-bearing frame 801. The first upper load-bearing roller 802 is rotatably connected to the upper load-bearing frame 801. The upper end of the first upper load-bearing roller 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;

[0060] The second upper load-bearing component includes a second upper load-bearing roller 803 disposed on the other side of the upper load-bearing frame 801. The axial direction of the second upper load-bearing roller 803 is parallel to the axial direction of the first upper load-bearing roller 802, and it is rotatably connected to the upper load-bearing frame 801. The upper end of the second upper load-bearing roller 803 contacts the lower surface of the fourth middle rail connecting piece 304, and the lower end contacts the upper surface of the fourth upper rail connecting piece 204.

[0061] The third upper load-bearing component includes third upper load-bearing rollers 804 disposed on the left and right sides of the upper load-bearing frame 801. The third 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 third upper load-bearing roller 804 is perpendicular to the axial direction of the first upper load-bearing roller 802. Among them, the wheel surface of the third upper load-bearing roller 804 on the left contacts the left side surface of the second middle rail connecting piece 302 and the inner side surface of the second upper rail connecting piece 202; the wheel surface of the third upper load-bearing roller 804 on the right contacts the right side surface of the second middle rail connecting piece 302 and the inner side surface of the third upper rail connecting piece 203.

[0062] By providing the first upper load-bearing component, the second upper load-bearing component, and the third upper load-bearing component, the upper rail 2 can be supported and guided (i.e., limited). Among them, the first upper load-bearing roller 802 and the second upper load-bearing roller 803 are used to support the upper rail 2, and at the same time, the second upper load-bearing roller 803 can prevent the upper rail from jumping in the up and down direction; while the second load-bearing roller 804 can limit the upper rail 2 in the left and right directions, thereby preventing the upper rail 2 from jumping in the left and right directions.

[0063] See Figures 1-11 , the lower load-bearing wheel set 9 includes a lower load-bearing frame 901, a first lower load-bearing component, a second lower load-bearing component, a third lower load-bearing component, and a fourth lower load-bearing component disposed on the lower load-bearing frame 901. Among them, the first lower load-bearing component is disposed on the lower side of the lower load-bearing frame 901 and is located within the fifth installation gap E; the second lower load-bearing component is disposed on the left side of the lower load-bearing frame 901 and is located within the third installation gap C; the third lower load-bearing component is located on the left and right sides of the lower load-bearing frame 901 and is located within the third installation gap C and the fourth installation gap D; the fourth lower load-bearing component is disposed on the right side of the lower load-bearing frame 901 and is located within the sixth installation gap F, where

[0064] 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; there are multiple groups of the first lower load-bearing rollers 902, 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 end of the first lower load-bearing roller 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;

[0065] The second lower load-bearing component includes a second lower load-bearing roller 904 arranged at the upper left end of the lower load-bearing frame 901; the second lower load-bearing roller 904 is rotatably connected in the lower load-bearing frame 901, and the axial direction of the second lower load-bearing roller 904 is perpendicular to the axial direction of the first lower load-bearing roller 902; the wheel surface of the second lower load-bearing roller 904 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;

[0066] The third lower load-bearing component includes third lower load-bearing rollers 903 arranged at the upper ends on both sides of the lower load-bearing frame 901; there are multiple groups of the third lower load-bearing rollers 903, 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; among them, the upper end of the third lower load-bearing roller 903 on the left side contacts the lower surface of the fourth lower rail connecting piece 404, and the lower end contacts the upper surface of the fifth middle rail connecting piece 305; the upper end of the third lower load-bearing roller 903 on the right side contacts the lower surface of the fifth lower rail connecting piece 405, and the lower end contacts the upper surface of the first middle rail connecting piece 301;

[0067] The fourth lower load-bearing component includes a fourth lower load-bearing roller 905 arranged at the lower right end of the lower load-bearing frame 901; the fourth lower load-bearing roller 905 is rotatably connected in the lower load-bearing frame 901, and the axial direction of the fourth lower load-bearing roller 905 is perpendicular to the axial direction of the first lower load-bearing roller 902; the wheel surface of the fourth lower load-bearing roller 905 contacts the outer side surface of the third middle rail connecting piece 303 and the inner side surface of the third lower rail connecting piece 403 respectively.

[0068] By providing the first lower load-bearing component, the second lower load-bearing component, the third lower load-bearing component and the fourth lower load-bearing component, the support and guidance of the middle rail 3 can be realized. Among them, the first lower load-bearing roller 902 and the second lower load-bearing roller 903 are used to support the middle rail 3, and at the same time, the second lower load-bearing roller 903 can prevent the middle rail 3 from jumping in the up and down direction; while the second lower load-bearing roller 904 and the fourth lower load-bearing roller 905 can realize the left and right direction limit of the middle rail 3, thereby preventing the middle rail 3 from jumping in the left and right direction.

[0069] See Figures 1-11The upper load-bearing wheel sets 8 and the lower load-bearing wheel sets 9 are both 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; the lower load-bearing frames 901 in the two groups of lower load-bearing wheel sets 9 are connected by a lower connecting frame.

[0070] See Figures 1-11 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, a gear-rack transmission mechanism is provided; among them, 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. Among them, the transmission gear 6 is rotatably connected to the middle rail 3, and the upper end meshes with the first rack 5, and the lower end meshes with the second rack 7;

[0071] Through the above settings, during the sliding process of the upper rail 2, due to the meshing relationship between the first rack 5 and the transmission gear 6, therefore, 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, therefore, the middle rail 3 will also move relative to the lower rail 4; and the transmission ratio between 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 three-section hidden synchronous stable slide rail of the present invention more accurate.

[0072] See Figures 1-11 On both sides of the upper connecting frame and the lower connecting frame, they 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 5 and the second rack 10;

[0073] In addition, a screw connection method can also be adopted.

[0074] See Figures 1-11 The brackets 1 are two groups, and the two groups of brackets 1 are arranged at both ends of the lower end. Each group of brackets 1 is L-shaped. By adopting the brackets 1, the three-section hidden synchronous stable slide rail of the present invention can be installed on furniture.

[0075] Embodiment 2

[0076] See Figures 12-18 The difference between this embodiment and Embodiment 1 is that:

[0077] A fifth middle rail connecting piece 305 is arranged between the second middle rail connecting piece 302 and the first middle rail connecting piece 301. The fifth middle rail connecting piece 305 is arc-shaped. One end of it is connected to the bottom of the second middle rail connecting piece 302, and the other end is arc-connected to the first middle rail connecting piece 301. The fourth lower rail connecting piece 404 is located above the fifth middle rail connecting piece 305, and the fourth lower rail connecting piece 404 is also arc-shaped. The fifth middle rail connecting piece 305 and the fourth lower rail connecting piece 404 are coaxial.

[0078] See Figures 12-18 , the lower load-bearing wheel set 9 includes a lower load-bearing frame 901, a first lower load-bearing component, a second lower load-bearing component, a third lower load-bearing component and a fourth lower load-bearing component arranged on the lower load-bearing frame 901. Among them, the first lower load-bearing component is arranged on the lower side of the lower load-bearing frame 901 and is located within the fifth installation gap E. The second lower load-bearing component is arranged on the left side of the lower load-bearing frame 901 and is located within the third installation gap C. The third lower load-bearing component is located on the right side of the lower load-bearing frame 901 and is located within the fourth installation gap D. The fourth lower load-bearing component is arranged on the right side of the lower load-bearing frame 901 and is located within the sixth installation gap F. Among them,

[0079] The first lower load-bearing component includes a first lower load-bearing roller 902 arranged on the lower side of the lower load-bearing frame 901. The first lower load-bearing roller 902 is provided in multiple groups. 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 end of the first lower load-bearing roller 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.

[0080] The second lower load-bearing component includes a lower load-bearing ball 904 arranged at the upper end of the left side of the lower load-bearing frame 901. The lower load-bearing ball 904 is installed in the lower load-bearing frame 901 through a universal joint structure. The wheel surface of the lower load-bearing ball 904 contacts the outer side surface of the fifth middle rail connecting piece 305 and the inner side surface of the fourth lower rail connecting piece 404 respectively.

[0081] The third lower load-bearing component includes a third lower load-bearing roller 903 arranged at the upper end of the right side of the lower load-bearing frame 901. The third lower load-bearing roller 903 is provided in multiple groups. 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 end of the third lower load-bearing roller 903 contacts the lower surface of the fifth lower rail connecting piece 405, and the lower end contacts the upper surface of the first middle rail connecting piece 301.

[0082] The fourth lower load-bearing component includes a fourth lower load-bearing roller 905 provided at the lower right end of the lower load-bearing frame 901; the fourth lower load-bearing roller 905 is rotatably connected in the lower load-bearing frame 901, and the axial direction of the fourth lower load-bearing roller 905 is perpendicular to the axial direction of the first lower load-bearing roller 902; the wheel surfaces of the fourth lower load-bearing roller 905 are respectively in contact with the outer side surface of the third middle rail connecting piece 303 and the inner side surface of the third lower rail connecting piece 403.

[0083] In this embodiment, the lower load-bearing ball 904 is used to replace the second lower load-bearing roller and the third lower load-bearing roller on the left side in Embodiment 1, and it can also play the role of supporting and guiding (limiting) the middle rail 3.

[0084] The remaining structures can be implemented with reference to Embodiment 1.

[0085] The above is a preferred embodiment of the present invention, but the embodiments of the present invention 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 invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A three - section telescopic slide rail, characterized in that, It includes a bracket, a lower rail provided on the bracket, a middle rail provided on the lower rail, and an upper rail provided on the middle rail; an upper load-bearing wheel set is provided between the upper rail and the middle rail, and a lower load-bearing wheel set is provided between the lower rail and the middle rail; The upper rail includes a horizontally arranged first upper rail connecting piece, and a second upper rail connecting piece and a third upper rail connecting piece respectively arranged on both sides of the first upper rail connecting piece. Among them, the second upper rail connecting piece extends vertically downward and bends horizontally inward to form a horizontally extending fourth upper rail connecting piece; the third upper rail connecting piece extends vertically downward; The lower rail includes a horizontally arranged first lower rail connecting piece, and a second lower rail connecting piece and a third lower rail connecting piece arranged on both sides of the first lower rail connecting piece. Among them, the second lower rail connecting piece extends vertically upward and bends horizontally inward to form a fourth lower rail connecting piece; the third lower rail connecting piece extends vertically upward and bends horizontally inward to form a horizontally extending fifth lower rail connecting piece; The middle rail includes a horizontally arranged first middle rail connecting piece, and a second middle rail connecting piece and a third middle rail connecting piece respectively arranged on both sides of the first middle rail connecting piece. Among them, the second middle rail connecting piece extends vertically upward and bends horizontally outward to form a horizontally extending fourth middle rail connecting piece; the third middle rail connecting piece extends vertically downward; among them, A fifth middle rail connecting piece is provided between the second middle rail connecting piece and the first middle rail connecting piece. The fifth 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 fourth lower rail connecting piece is located above the fifth middle rail connecting piece and extends horizontally; or, a fifth middle rail connecting piece is provided between the second middle rail connecting piece and the first middle rail connecting piece. The fifth middle rail connecting piece is arc-shaped, 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 fourth lower rail connecting piece is located above the fifth middle rail connecting piece and the fourth lower rail connecting piece is also arc-shaped; the fifth middle rail connecting piece and the fourth lower rail connecting piece are coaxial.

2. The three - section telescopic slide rail according to claim 1, wherein, The height of the fourth lower rail connecting piece is higher than the height of the fifth lower rail connecting piece.

3. The three - section telescopic slide rail according to claim 1, characterized in that, The gap between the fourth middle rail connecting piece, the second middle rail connecting piece, the second upper rail connecting piece and the fourth upper rail connecting piece forms a first installation gap; the gap between the first middle rail connecting piece, the second middle rail connecting piece, the first upper rail connecting piece and the third upper rail connecting piece forms a second installation gap; the gap between the fifth middle rail connecting piece, the second middle rail connecting piece, the second lower rail connecting piece and the fourth lower rail connecting piece forms a third installation gap; the gap between the first middle rail connecting piece and the fifth lower rail connecting piece forms a fourth installation gap; the gap between the first middle rail connecting piece, the third middle rail connecting piece, the first lower rail connecting piece and the second lower rail connecting piece forms a fifth installation gap; the gap between the third middle rail connecting piece and the third lower rail connecting piece forms a sixth installation gap.

4. The three - section telescopic slide rail according to claim 3, wherein, The upper load-bearing wheel set includes an upper load-bearing frame, a first upper load-bearing component, a second upper load-bearing component, and a third upper load-bearing component arranged in the middle of the upper load-bearing frame. Among them, the first upper load-bearing component is located within the second installation gap; the second upper load-bearing component is located within the first installation gap; the third upper load-bearing component has two groups and is respectively located within the first installation gap and the second installation gap.

5. The three - section telescopic slide rail according to claim 4, wherein The first upper load-bearing component includes a first upper load-bearing roller arranged on one side 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.

6. The three - section telescopic slide rail according to claim 5, characterized in that, The second upper load-bearing component includes a second upper load-bearing roller arranged on the other side of the upper load-bearing frame. The axial direction of the second upper load-bearing roller is parallel to the axial direction of the first upper load-bearing roller and is rotatably connected to the upper load-bearing frame. The upper end of the second upper load-bearing roller contacts the lower surface of the fourth middle rail connecting piece, and the lower end contacts the upper surface of the fourth upper rail connecting piece.

7. The three - section pull - out slide rail according to claim 6, wherein, The third upper load-bearing component includes third upper load-bearing rollers arranged on the left and right sides of the upper load-bearing frame; the third 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 third upper load-bearing roller is perpendicular to the axial direction of the first upper load-bearing roller; among them, the wheel surface of the third upper load-bearing roller on the left contacts the left side surface of the second middle rail connecting piece and the inner side surface of the second upper rail connecting piece respectively; the wheel surface of the third upper load-bearing roller on the right contacts the right side surface of the second middle rail connecting piece and the inner side surface of the third upper rail connecting piece respectively.

8. The three - section pull - out slide rail according to claim 4, characterized in that, The lower load-bearing wheel set includes a lower load-bearing frame, a first lower load-bearing component, a second lower load-bearing component, a third lower load-bearing component, and a fourth lower load-bearing component arranged on the lower load-bearing frame. Among them, the first lower load-bearing component is arranged on the lower side of the lower load-bearing frame and is located within the fifth installation gap; the second lower load-bearing component is arranged on the left side of the lower load-bearing frame and is located within the third installation gap; the third lower load-bearing component is located on the left and right sides of the lower load-bearing frame and is located within the third installation gap and the fourth installation gap; the fourth lower load-bearing component is arranged on the right side of the lower load-bearing frame and is located within the sixth installation gap, where The first lower load-bearing component includes a first lower load-bearing roller arranged 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 the first lower load-bearing roller 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; The second lower load-bearing component includes a second lower load-bearing roller disposed at the upper left end of the lower load-bearing frame; the second lower load-bearing roller is rotatably connected in the lower load-bearing frame, and the axial direction of the second lower load-bearing roller is perpendicular to the axial direction of the first lower load-bearing roller; the wheel surfaces of the second lower load-bearing roller 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; The third lower load-bearing component includes third lower load-bearing rollers disposed at the upper ends of both sides of the lower load-bearing frame; 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; wherein, the upper end of the third lower load-bearing roller on the left side is in contact with the lower surface of the fourth lower rail connecting piece, and the lower end is in contact with the upper surface of the fifth middle rail connecting piece; the upper end of the third lower load-bearing roller on the right side is in contact with the lower surface of the fifth lower rail connecting piece, and the lower end is in contact with the upper surface of the first middle rail connecting piece; The fourth lower load-bearing component includes a fourth lower load-bearing roller disposed at the lower right end of the lower load-bearing frame; the fourth lower load-bearing roller is rotatably connected in the lower load-bearing frame, and the axial direction of the fourth lower load-bearing roller is perpendicular to the axial direction of the first lower load-bearing roller; the wheel surfaces of the fourth lower load-bearing roller are respectively in contact with the outer side surface of the third middle rail connecting piece and the inner side surface of the third lower rail connecting piece.

9. The three - section telescopic slide rail according to claim 4, characterized in that, The lower load-bearing wheel set includes a lower load-bearing frame, a first lower load-bearing component, a second lower load-bearing component, a third lower load-bearing component, and a fourth lower load-bearing component disposed on the lower load-bearing frame. Among them, the first lower load-bearing component is disposed on the lower side of the lower load-bearing frame and is located within the fifth installation gap; the second lower load-bearing component is disposed on the left side of the lower load-bearing frame and is located within the third installation gap; the third lower load-bearing component is located on the right side of the lower load-bearing frame and is located within the fourth installation gap; the fourth lower load-bearing component is disposed on the right side of the lower load-bearing frame and is located within the sixth installation gap, where, 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 the first lower load-bearing roller is in contact with the lower surface of the first middle rail connecting piece, and the lower end is in contact with the upper surface of the first lower rail connecting piece; The second lower load-bearing component includes a lower load-bearing ball disposed at the upper left end of the lower load-bearing frame; the lower load-bearing ball is installed in the lower load-bearing frame through a universal joint structure, and the wheel surfaces of the lower load-bearing ball are respectively in contact with the outer side surface of the fifth middle rail connecting piece and the inner side surface of the fourth lower rail connecting piece; The third lower load-bearing component includes a third lower load-bearing roller disposed at the upper right end of the lower load-bearing frame; 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 roller is in contact with the lower surface of the fifth lower rail connecting piece, and the lower end is in contact with the upper surface of the first middle rail connecting piece; The fourth lower load-bearing component includes a fourth lower load-bearing roller disposed at the lower right end of the lower load-bearing frame; the fourth lower load-bearing roller is rotatably connected in the lower load-bearing frame, and the axial direction of the fourth lower load-bearing roller is perpendicular to the axial direction of the first lower load-bearing roller; the wheel surfaces of the fourth lower load-bearing roller are respectively in contact with the outer side surface of the third middle rail connecting piece and the inner side surface of the third lower rail connecting piece.

10. The three - section telescopic slide rail according to claim 8, wherein, A gear-rack transmission mechanism is provided between the upper load-bearing frame and the middle rail and between the lower load-bearing frame and the middle rail.

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