Slide rail assembly and withdrawal system comprising same

Abstract

One embodiment of the present invention provides a withdrawal system comprising: a slide rail assembly including a first rail made of a first material, a second rail made of a second material and slidably installed relative to the first rail, and a ball retainer having a plurality of balls inserted therein, each of which being in rolling contact with the first rail and the second rail; and a storage body fastened to the second rail and pulled in and out together with the second rail, wherein the first material and the second material differ in at least one of hardness and specific gravity.

Description

Slide rail assembly and withdrawal system including the same

[0001] The present invention relates to a slide rail assembly and a withdrawal system including the same.

[0002] In general, a slide rail assembly is installed in a sliding manner on the body of furniture, home appliances such as refrigerators, automobiles, or various organizers in a state of being combined with a storage body, and is used to store necessary items.

[0003] A slide rail assembly like this is installed between the inner wall of the installation space of the main body and the side of the storage body, and the insertion and withdrawal operations are performed through rolling contact.

[0004] A slide rail assembly typically comprises a fixed rail installed on the inner wall of the main body and a movable rail installed on the side of the storage unit. A retainer, which includes a number of balls to ensure rolling contact, is installed between the fixed rail and the movable rail. This slide rail assembly is configured so that when a user withdraws a storage unit from its insertion position, the movable rail is withdrawn from the fixed rail while being supported by the retainer.

[0005] However, conventional slide rail assemblies are made of metal, specifically steel. While making slide rail assemblies solely from steel ensures sufficient rigidity, it also suffers from weight. Therefore, research is being conducted to reduce the weight of slide rail assemblies.

[0006] Prior art literature

[0007] Korean Patent Publication No. 10-2008-0059697 (July 1, 2008)

[0008] The present invention is intended to solve the problems of the prior art described above, and an object of the present invention is to provide a slide rail assembly made of two or more materials with different specific gravity, which is capable of being lightweight while ensuring rigidity, and a pull-out system including the same.

[0009] In order to achieve the above object, one aspect of the present invention provides a slide rail assembly including a first rail made of a first material, a second rail made of a second material and installed to be slidably movable with respect to the first rail, and a ball retainer having a plurality of balls inserted therein, each of which is in rolling contact with the first rail and the second rail, and a storage body fastened to the second rail and inserted and extracted together with the second rail, wherein the first material and the second material differ in at least one of hardness and specific gravity.

[0010] In one embodiment of the present invention, the first material may be a pullout system having at least one of hardness and specific gravity greater than that of the second material.

[0011] In one embodiment of the present invention, the first material may be a steel material, and the second material may be an aluminum material, which may be a withdrawal system.

[0012] In one embodiment of the present invention, the plurality of balls may be a withdrawal system characterized in that they are made of a resin material.

[0013] In one embodiment of the present invention, the plurality of balls may be a withdrawal system characterized in that they include a first type of ball and a second type of ball made of a different material from the first type of ball.

[0014] In one embodiment of the present invention, the first type of ball and the second type of ball may be a withdrawal system characterized in that the diameters are the same, but the first type of ball is made of a metal material or a ceramic material, and the second type of ball is made of a resin material.

[0015] In one embodiment of the present invention, the first rail may be a pull-out system characterized in that it includes a first upper portion having a first fixed cloud groove formed on a lower side, a first lower portion having a second fixed cloud groove formed on an upper side, and a first connecting portion connecting the first upper portion and the first lower portion, and the second rail includes a second upper portion having a first movable cloud groove formed on an upper side, a second lower portion having a second movable cloud groove formed on a lower side, a second connecting portion connecting the second upper portion and the second lower portion, and an extension portion extending laterally from one of the second upper portion, the second lower portion, and the second connecting portion, on which the storage body is seated.

[0016] In one embodiment of the present invention, the slide rail assembly may be a pull-out system characterized in that it further includes a front coupling member having a coupling portion coupled to the storage body on the front side of the second rail, and the storage body further includes a first fixing portion fixed to the coupling portion and a seating portion mounted on the extension portion on the side.

[0017] In one embodiment of the present invention, the extraction system may be characterized in that a second fixing part is formed at the rear end of the fixing part and is fixed to the rear end of the extension part.

[0018] In one embodiment of the present invention, the second fixing part may be a withdrawal system characterized in that it is formed to extend downward from the rear end of the fixing part so that the rear end of the extension part is in contact with it.

[0019] In one embodiment of the present invention, the second fixing part may be a pull-out system characterized in that it is formed by bending at the rear end of the mounting part so that the rear end of the extension part is fitted.

[0020] In one embodiment of the present invention, the extraction system may be characterized in that a first coupling hole is formed on the rear side of the extension portion, a second coupling hole is formed on the rear side of the mounting portion, and the first coupling hole and the second coupling hole are pin-coupled or screw-coupled.

[0021] In one embodiment of the present invention, the extraction system may be characterized in that a first coupling hole is formed on the rear side of the extension portion, a second coupling hole is formed on the rear side of the mounting portion, the first coupling hole and the second coupling hole are pin-coupled or screw-coupled, a third coupling hole is formed on the front side of the extension portion, a fourth coupling hole is formed on the rear side of the mounting portion, and the third coupling hole and the fourth coupling hole are pin-coupled or screw-coupled.

[0022] In order to achieve the above object, another aspect of the present invention provides a slide rail assembly including a first rail made of a first material, a second rail made of a second material and slidably installed with respect to the first rail, and a ball retainer having a plurality of balls inserted therein, each of which is in rolling contact with the first rail and the second rail, wherein the first material and the second material differ in at least one of hardness and specific gravity.

[0023] In one embodiment of the present invention, the first material may be a slide rail assembly having at least one of hardness and specific gravity greater than that of the second material.

[0024] According to one aspect of the present invention, a slide rail assembly is a mixed-material rail assembly including a first rail of a first material and a second rail of a second material different from the first material, which can reduce the weight of a pull-out system.

[0025] In addition, the slide rail assembly and the storage body include a joint structure that can be fastened to each other, so that a separate bracket for fastening the slide rail assembly and the storage body is not necessary and installation can be easy.

[0026] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0027] FIG. 1 is a perspective view of a withdrawal system according to one embodiment of the present invention.

[0028] FIG. 2 is a drawing showing a slide rail assembly and a storage body separated according to one embodiment of the present invention.

[0029] Figures 3 and 4 are exploded perspective views of a slide rail assembly according to one embodiment of the present invention.

[0030] FIG. 5 is a cross-sectional view of a withdrawal system according to one embodiment of the present invention.

[0031] Figure 6 is a cross-sectional exploded view of a slide rail assembly according to one embodiment of the present invention.

[0032] Figure 7 is a perspective view of a ball retainer according to one embodiment of the present invention.

[0033] Figures 8 (a) and (b) are perspective views of a front-side connecting member according to one embodiment of the present invention.

[0034] Figure 9 is a partially enlarged view of a side of a storage body according to one embodiment of the present invention.

[0035] Figures 10 (a) and (b) show the combined structure of a slide rail assembly and a storage body according to one embodiment of the present invention.

[0036] Fig. 11 is a partially enlarged view of a side of a storage body according to a second embodiment of the present invention.

[0037] Figures 12 (a) and (b) show the combined structure of the slide rail assembly and the storage body according to the second embodiment of the present invention.

[0038] Fig. 13 is a partially enlarged view of a side of a storage body according to a third embodiment of the present invention.

[0039] Figures 14 (a) and (b) show the combined structure of the slide rail assembly and the storage body according to the third embodiment of the present invention.

[0040] Fig. 15 is a partially enlarged view of a side of a storage body according to a fourth embodiment of the present invention.

[0041] Figures 16 (a) and (b) show the combined structure of the slide rail assembly and the storage body according to the fourth embodiment of the present invention.

[0042] Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention can be implemented in various different forms and is therefore not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity of description, and similar parts have been designated with similar reference numerals throughout the specification.

[0043] Throughout the specification, when a part is said to be "connected" to another part, this includes not only "directly connected" but also "indirectly connected" with other elements intervening. Furthermore, when a part is said to "include" a component, this does not exclude other components, but rather implies that the other components may be included, unless otherwise specifically stated.

[0044] Throughout the specification, terms indicating direction such as “upper”, “side”, and “lower” are only used to describe the relative positional relationship between components represented in the drawings, and do not limit the absolute positions of the components.

[0045] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0046] FIG. 1 is a perspective view of a retrieval system according to an embodiment of the present invention, FIG. 2 is a view of a slide rail assembly and a storage body separated from each other according to an embodiment of the present invention, FIGS. 3 and 4 are exploded perspective views of a slide rail assembly according to an embodiment of the present invention, FIG. 5 is a cross-sectional view of a retrieval system according to an embodiment of the present invention, FIG. 6 is a cross-sectional exploded view of a slide rail assembly according to an embodiment of the present invention, FIG. 7 is a perspective view of a ball retainer according to an embodiment of the present invention, FIGS. 8(a) and 8(b) are perspective views of a front coupling member according to an embodiment of the present invention, FIG. 9 is a partially enlarged view of a side surface of a storage body according to an embodiment of the present invention, and FIGS. 10(a) and 10(b) illustrate a coupling structure of a slide rail assembly and a storage body according to an embodiment of the present invention.

[0047] Referring to FIGS. 1 to 10, the withdrawal system (1000) of the present invention includes a slide rail assembly (100) and a storage body (200).

[0048] More specifically, the withdrawal system (1000) is configured to include a slide rail assembly (100) including a first rail (110) made of a first material, a second rail (120) made of a second material and installed so as to be slidably moved relative to the first rail (110), and a ball retainer (130) having a plurality of balls (131) inserted therein, each of which makes cloud contact with the first rail (110) and the second rail (120), and a storage body (200) fastened to the second rail (120) and introduced and withdrawn together with the second rail (120).

[0049] The slide rail assembly (100) can be mounted on various components that require insertion and withdrawal. For example, the slide rail assembly (100) can be combined with a storage body (200) provided in a main body, such as a dishwasher, refrigerator, furniture, etc., and used to insert the storage body (200) into the main body or withdraw it from the main body.

[0050] In addition, the slide rail assembly (100) is configured to reduce friction between the rails by installing a ball retainer (130) having a plurality of balls (131) between the first rail (110) and the second rail (120). As a result, the slide rail assembly (100) enables smoother sliding movement.

[0051] This slide rail assembly (100) may be a mixed material rail assembly including a first rail (110) of a first material and a second rail (120) of a second material different from the first material.

[0052] For example, the first material forming the first rail (110) and the second material forming the second rail (120) may differ in at least one of hardness and specific gravity. Preferably, the first material forming the first rail (110) may be configured to have at least one of hardness and specific gravity greater than that of the second material forming the second rail (120).

[0053] For example, the first material may be steel, and the second material may be aluminum. Aluminum has a lower hardness than steel, but is approximately 35% lighter. Therefore, using aluminum as the material for the second rail (120) can reduce the overall weight of the slide rail assembly (1000), thereby achieving weight reduction. However, this is not limited to this, and the material for the second rail may be any material capable of achieving weight reduction, not just aluminum.

[0054] For example, the first rail (110) can be manufactured from steel material using a roll forming method, and the second rail (120) can be manufactured from aluminum material using an extrusion method.

[0055] The first rail (110) may be a fixed rail fixed to the side wall of the main body of a dishwasher, refrigerator, furniture, etc., and includes a first upper part (111), a first lower part (112), and a first connecting part (113).

[0056] More specifically, the first rail (110) is configured to include a first upper portion (111) having a first fixed cloud groove (111a) formed on the lower portion, a first lower portion (112) having a second fixed cloud groove (112a) formed on the upper portion, and a first connecting portion (113) connecting the first upper portion (111) and the first lower portion (112). The first fixed cloud groove (111a) and the first fixed cloud groove (112a) may be formed in a concave curved shape so that stable cloud contact can be achieved while surrounding the ball (131).

[0057] This first rail (110) may have three sides and may be open in one direction, and a receiving space surrounded by the three sides may be formed. A ball retainer (130) and a second rail (120) may be received in the receiving space of the first rail (110).

[0058] The second rail (120) may be a movable rail for introducing and withdrawing the storage body (200) into and out of the main body, and includes a second upper part (121), a second lower part (122), and a second connecting part (123).

[0059] More specifically, the second rail (120) is configured to include a second upper portion (121) having a first moving cloud groove (121a) formed on the upper portion, a second lower portion (122) having a second moving cloud groove (122a) formed on the lower portion, and a second connecting portion (123) connecting the second upper portion (121) and the second lower portion (122). The first moving cloud groove (121a) and the second moving cloud groove (122a) may be formed in a concave curved shape so that stable cloud contact can be achieved while surrounding the ball (131).

[0060] A first raceway in which a plurality of balls (131) provided on the upper side of a ball retainer (130) roll can be formed between the first upper part (111) of the first rail (110) and the second upper part (121) of the second rail (120), and a second raceway in which a plurality of balls (131) provided on the lower side of a ball retainer (130) roll can be formed between the first lower part (112) and the second lower part (122).

[0061] Meanwhile, the second rail (120) may further include an extension portion (124) extending laterally from one of the second upper portion (121), the second lower portion (122), and the second connecting portion, on which the storage body (200) is mounted. Preferably, the extension portion (124) may be formed to extend laterally from the second lower portion (122).

[0062] The ball retainer (130) is provided between the first rail (110) and the second rail (120), and when the second rail (120) is introduced or withdrawn, it allows the second rail (120) to move smoothly along the first rail (110).

[0063] Such a ball retainer (130) may include a plurality of balls (131). A plurality of ball insertion holes are formed in the ball retainer (130), and a plurality of balls (131) are inserted into the plurality of ball insertion holes. Here, the ball insertion holes prevent the balls (131) from coming off and support them so that they can rotate.

[0064] The ball (131) provided on the upper side of the ball retainer (130) is in rolling contact with the first fixed rolling groove (111a) of the first rail (110) at the upper side, and in rolling contact with the first movable rolling groove (121a) of the second rail (120) at the lower side. In addition, the ball (131) provided on the lower side of the ball retainer (130) is in rolling contact with the second fixed rolling groove (112a) of the first rail (110) at the lower side, and in rolling contact with the second movable rolling groove (122a) of the second rail (120) at the upper side. These multiple balls (131) in rolling contact between the first rail (110) and the second rail (120) allow the second rail (120) to move smoothly from the first rail (110) during the process of bringing the second rail (120) in or out.

[0065] In the process of the second rail (120) being smoothly moved from the first rail (110), the ball retainer (130) moves together along the moving direction of the second rail (120). This ball retainer (130) can be moved by the rotation of a plurality of balls (131). At this time, the moving distance of the ball retainer (130) is shorter than the moving distance of the second rail (120), and the moving speed of the ball retainer (130) is slower than the moving speed of the second rail (120).

[0066] For example, the plurality of balls (131) may include first type balls (131a) positioned at both longitudinal ends of the ball retainer (130) and second type balls (131b) positioned at the longitudinal middle portion of the ball retainer (130). At this time, the first type balls (131a) and the second type balls (131b) may have the same diameter, but the first type balls (131a) may be made of a metal material, and the second type balls (131b) may be made of a resin material. That is, the balls positioned at both ends of the ball retainer (130) may be made of a hard steel material, and the balls positioned at the middle portion of the ball retainer (130) may be made of a softer resin material, thereby reducing rolling noise of the balls, extending their lifespan, and being advantageous in terms of economy.

[0067] For example, the first type ball (131a) may be made of a metal material such as brass, bronze, aluminum, or steel, or a ceramic material, and the second type ball (131b) may be made of a resin material such as polyamide, polyoxymethylene (POM), polyethylene (PE), polypropylene (PP), or thermosetting plastics. However, the present invention is not limited thereto, and the first type ball (131a) and the second type ball (131b) may be made of the same material. For example, the first type ball (131a) and the second type ball (131b) may both be made of a resin material such as POM.

[0068] Referring to FIGS. 4, 8 to 10, the slide rail assembly (100) further includes a front coupling member (140) having a coupling portion (142) coupled with a storage body (200) on the front side of the second rail (120), and the storage body (200) may further include, on the side, a first fixing portion (220) fixed to the coupling portion (142) and a fixing portion (210) fixed to an extension portion (124) of the second rail (120).

[0069] As an example, the connecting portion (142) of the front connecting member (140) may be formed in an upwardly protruding projection shape, and the first fixing portion (220) of the storage body (200) may be formed in a cap shape into which the connecting portion (142) in the projection shape is inserted.

[0070] More specifically, the front coupling member (140) includes a body portion (141) coupled to the front side of the second rail (120), a coupling portion (142) protruding upward from the body portion (141), and a positioning portion (143) extending laterally from the body portion (141) to contact the front end of the second rail (120) and thereby determine a coupling position.

[0071] In addition, the mounting portion (210) of the storage body (200) includes a horizontal portion (211) extending horizontally from the side of the storage body (200) and a second fixing portion (212) extending from the rear end of the horizontal portion (211) and fixed to the rear end of the extension portion (124). The first fixing portion (220) of the storage body (200) is open downward and may be provided with a receiving portion (221) capable of receiving a connecting portion (142) of a front connecting member (140) therein.

[0072] For example, the second fixed portion (212) may be formed to extend downward from the rear end of the horizontal portion (211) so as to contact the rear end of the extension portion (124) of the second rail (120).

[0073] That is, the combined structure of the slide rail assembly (100) and the storage body (200) according to the first embodiment may be a structure in which the second fixing part (212) of the storage body (200) is hung on the rear end of the extension part (124) of the second rail (120), the horizontal part (211) is seated on the extension part (124), and the connecting part (142) of the front fastening member (140) is inserted and fixed into the receiving part (221) of the first fixing part (220) to be connected to each other.

[0074] In this way, the slide rail assembly (100) and the storage body (200) include a joint structure that can be fastened to each other, so that a separate bracket for fastening the slide rail assembly (100) and the storage body (200) is unnecessary and installation can be easy.

[0075] Fig. 11 is a partially enlarged view of a side of a storage body according to a second embodiment of the present invention, and Figs. 12 (a) and (b) show a joint structure of a slide rail assembly and a storage body according to the second embodiment of the present invention.

[0076] Referring to FIGS. 11 and 12, the joint structure of the slide rail assembly (100) and the storage body (200) according to the second embodiment will be described with a focus on the differences from the joint structure of the slide rail assembly (100) and the storage body (200) according to the first embodiment described above.

[0077] In the combined structure of the slide rail assembly (100) and the storage body (200) according to the second embodiment, the mounting portion (210') of the storage body (200) includes a horizontal portion (211) extending horizontally from the side of the storage body (200) and a second fixing portion (212') extending from the rear end of the horizontal portion (211) and formed to be hooked onto the rear end of the extension portion (124), wherein the second fixing portion (212') may be formed by bending at the rear end of the horizontal portion (211) so that the rear end of the extension portion (124) is fitted therein. That is, the second fixing portion (212') is configured to surround the rear end of the extension portion (124) and prevent the extension portion (124) from being dislodged vertically.

[0078] Fig. 13 is a partially enlarged view of a side of a storage body according to a third embodiment of the present invention, and Figs. 14 (a) and (b) show a joint structure of a slide rail assembly and a storage body according to the third embodiment of the present invention.

[0079] Referring to FIGS. 13 and 14, the joint structure of the slide rail assembly (100) and the storage body (200) according to the third embodiment will be described with a focus on the differences from the joint structure of the slide rail assembly (100) and the storage body (200) according to the first embodiment described above.

[0080] In the coupling structure of the slide rail assembly (100) and the storage body (200) according to the third embodiment, a first coupling hole (124a) is formed on the rear side of the extension part (124), and a second coupling hole (213) is formed on the rear side of the mounting portion (210''). The first coupling hole (124a) and the second coupling hole (213) are pin-coupled or screw-coupled while their positions are aligned with each other. In one example, the first coupling hole (124a) and the second coupling hole (213) can be coupled to each other by the first pin (230) being pressed in from above while their positions are aligned with each other. That is, in the coupling structure of the slide rail assembly (100) and the storage body (200) according to the third embodiment, a structure may be formed in which a second coupling hole (213) is formed on the rear side of the mounting portion (210'') instead of a second fixing portion.

[0081] Fig. 15 is a partially enlarged view of a side of a storage body according to a fourth embodiment of the present invention, and Figs. 16 (a) and (b) show a joint structure of a slide rail assembly and a storage body according to the fourth embodiment of the present invention.

[0082] Referring to FIGS. 15 and 16, the joint structure of the slide rail assembly (100) and the storage body (200) according to the fourth embodiment will be described with a focus on the differences from the joint structure of the slide rail assembly (100) and the storage body (200) according to the first embodiment described above.

[0083] In the coupling structure of the slide rail assembly (100) and the storage body (200) according to the fourth embodiment, a first coupling hole (124a) is formed on the rear side of the extension part (124), a second coupling hole (213) is formed on the rear side of the mounting part (210''), and the first coupling hole (124a) and the second coupling hole (213) are pin-coupled or screw-coupled while their positions are aligned with each other, a third coupling hole (124b) is formed on the front side of the extension part (124), and a fourth coupling hole (214) is formed on the front side of the mounting part (210'''), and the third coupling hole (124b) and the fourth coupling hole (214) are pin-coupled or screw-coupled while their positions are aligned with each other. For example, the first coupling hole (124a) and the second coupling hole (213) can be coupled to each other by pressing the first pin (230) into them from above while their positions are aligned with each other, and the third coupling hole (124b) and the fourth coupling hole (214) can be coupled to each other by pressing the second pin (240) into them from above while their positions are aligned with each other. That is, in the coupling structure of the slide rail assembly (100) and the storage body (200) according to the fourth embodiment, a second coupling hole (213) may be formed on the rear side of the mounting portion (210''') instead of the second fixing portion, and a fourth coupling hole (214) may be formed on the front side instead of the first fixing portion. In addition, in the combined structure of the slide rail assembly (100) and the storage body (200) according to the fourth embodiment, the second rail (120) may have a structure in which a third combining hole (124b) is formed on the front side of the extension portion (124) instead of the front combining member.

[0084] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0085] The scope of the present invention is indicated by the claims described below, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0086] Description of the symbol

[0087] 1000 withdrawal system

[0088] 100 slide rail assembly

[0089] 110 First Rail

[0090] 111 First Upper

[0091] 112 Lower 1st

[0092] 113 First connector

[0093] 120 Second Rail

[0094] 121 Second Upper

[0095] 122 Second lower part

[0096] 123 Second connector

[0097] 124 extension

[0098] 124a first coupling hole

[0099] 124b 2nd coupling hole

[0100] 130 ball retainer

[0101] 131 Multiple Balls

[0102] 140 Front joint member

[0103] 141 Body

[0104] 142 joint

[0105] 143 Positioning Unit

[0106] 200 storage units

[0107] 210, 210', 210'', 210''' anchor

[0108] 211 horizontal section

[0109] 212, 212' 2nd fixed section

[0110] 213 Second coupling hole

[0111] 214 4th coupling hole

[0112] 220 First Fixed Section

[0113] 221 Reception Area

[0114] 230 1st pin

[0115] 240 2nd pin

Claims

1. A slide rail assembly including a first rail made of a first material, a second rail made of a second material and installed so as to be able to slide relative to the first rail, and a ball retainer having a plurality of balls inserted therein, each of which makes rolling contact with the first rail and the second rail; and It includes a storage body that is connected to the second rail and is introduced and withdrawn together with the second rail, A withdrawal system wherein the first material and the second material have different hardness and specific gravity.

2. In paragraph 1, A withdrawal system wherein the first material has at least one of hardness and specific gravity greater than that of the second material.

3. In paragraph 1, A withdrawal system, characterized in that the first material is a steel material and the second material is an aluminum material.

4. In paragraph 1, A withdrawal system, characterized in that the plurality of balls are made of a resin material.

5. In paragraph 1, The above multiple balls are, Type 1 ball; and A withdrawal system characterized by including a second type of ball made of a material different from the first type of ball.

6. In paragraph 5, A withdrawal system, characterized in that the first type of ball and the second type of ball have the same diameter, but the first type of ball is made of a metal material or a ceramic material, and the second type of ball is made of a resin material.

7. In paragraph 1, The above first rail, A first upper portion having a first fixed cloud groove formed on the lower side; A first lower part having a second fixed cloud groove formed on the upper side; and Including a first connecting portion connecting the first upper portion and the first lower portion, The above second rail, A second upper portion having a first moving cloud groove formed on the upper side; A second lower part having a second moving cloud groove formed on the lower side; A second connecting portion connecting the second upper portion and the second lower portion; and A withdrawal system characterized by including an extension portion extending laterally from one of the second upper portion, the second lower portion and the second connecting portion, on which the storage body is secured.

8. In paragraph 7, The above slide rail assembly, In the front side of the second rail, a front side connecting member is further included having a connecting portion that is connected to the storage body, The above storage body is on the side, A first fixing member fixed to the above joint; and A withdrawal system, characterized in that it further includes a mounting portion that is mounted on the extension portion.

9. In paragraph 8, A withdrawal system, characterized in that a second fixing part is formed at the rear end of the above-mentioned fixing part, which is fixed to the rear end of the above-mentioned extension part.

10. In paragraph 9, A withdrawal system, characterized in that the second fixing member is formed to extend downward from the rear end of the fixing member so that the rear end of the extension member is in contact with it.

11. In paragraph 9, A withdrawal system, characterized in that the second fixing member is formed by bending at the rear end of the fixing member so that the rear end of the extension member is fitted therein.

12. In paragraph 8, A withdrawal system, characterized in that a first coupling hole is formed on the rear side of the extension portion, a second coupling hole is formed on the rear side of the mounting portion, and the first coupling hole and the second coupling hole are pin-coupled or screw-coupled.

13. In paragraph 7, A first coupling hole is formed on the rear side of the extension portion, a second coupling hole is formed on the rear side of the mounting portion, and the first coupling hole and the second coupling hole are pin-coupled or screw-coupled. A withdrawal system, characterized in that a third coupling hole is formed on the front side of the extension portion, a fourth coupling hole is formed on the rear side of the mounting portion, and the third coupling hole and the fourth coupling hole are pin-coupled or screw-coupled.

14. A first rail made of a first material; A second rail made of a second material and installed so as to be able to slide relative to the first rail; and It includes a ball retainer having a plurality of balls inserted into each of the first rail and the second rail, which are in cloud contact, A slide rail assembly, wherein the first material has at least one of hardness and specific gravity different from those of the second material.

15. In paragraph 14, A withdrawal system wherein the first material has at least one of hardness and specific gravity greater than that of the second material.

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