Guide rail device

Abstract

The utility model relates to a guide rail device for guiding drawing of a drawer. The rail device includes: a first rail member; the second guide rail part and the first guide rail part are arranged side by side, and the second guide rail part can move in the drawing direction relative to the first guide rail part; the guide plate component is arranged between the first guide rail component and the second guide rail component and is in sliding connection with the first guide rail component and the second guide rail component in the drawing direction, the first guide rail component and the second guide rail component are respectively made of metal profiles, and the guide plate component is of a flat plate structure; the first rail member and the second rail member each have an opening on a side surface facing each other, the opening receiving the guide plate member and allowing a movement of the corresponding rail member relative to the guide plate member in a pull-out direction. A plurality of sliding portions are provided separately in the longitudinal direction of the guide plate member on a side portion of the guide plate member facing the first rail member and a side portion of the guide plate member facing the second rail member.

Description

Technical Field

[0001] The utility model relates to a guide rail device for guiding the pulling and pushing of a drawer. Background Art

[0002] In a factory, there are a large number of drawers for storing metal fittings and formed with positioning parts for positioning the fittings.

[0003] In the past, from the perspective of cost, the guide rail device for such drawers often adopted a two-section guide rail. However, the guide rail components are usually formed by bending a 2-3 mm sheet, with low machining and assembly accuracy, low rigidity and strength, and easy to deform, resulting in a large gap between the guide rail components, poor sliding stability, and easy to slide out and fall from the track during the pulling and pushing process, not only posing a safety risk but also having a high maintenance rate. Summary of the Utility Model

[0004] The utility model is completed to solve the above problems, and its purpose is to provide a guide rail device with high machining and assembly accuracy, which can effectively improve the sliding stability.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A guide rail device for guiding the pulling and pushing of a drawer, characterized in that

[0007] The guide rail device includes:

[0008] A first guide rail component;

[0009] A second guide rail component, which is arranged side by side with the first guide rail component and can move relative to the first guide rail component in the pulling and pushing direction; and

[0010] A guide plate component, which is arranged between the first guide rail component and the second guide rail component and is slidably connected to the first guide rail component and the second guide rail component respectively in the pulling and pushing direction,

[0011] The first guide rail component and the second guide rail component are respectively composed of metal profiles, and the guide plate component is a flat plate structure,

[0012] The first guide rail component and the second guide rail component respectively have openings on the sides facing each other, and the openings receive the guide plate component and allow the corresponding guide rail component to move relative to the guide plate component in the pulling and pushing direction,

[0013] On the side of the guide plate component facing the first guide rail component and the side facing the second guide rail component, a plurality of sliding parts are separately arranged along the length direction of the guide plate component.

[0014] According to the above structure, the guide rail component and the guide plate component are high in rigidity and strength and easy to machine. While reducing the processing cost, it can improve the processing accuracy of each component, reduce the movement clearance between the guide rail component and the guide plate component, and moreover, can increase the contact points between the guide plate component and the guide rail component, so that the sliding parts are scattered and evenly distributed to continuously guide the sliding of the guide rail in the sliding direction, avoiding the offset between components. Thus, the sliding stability of the guide rail device can be effectively improved.

[0015] In some embodiments, the first guide rail component and the second guide rail component are square tubes formed by milling a metal profile. In addition, the first guide rail component and the second guide rail component have the same cross-section. According to the above structure, the processing operation can be quickly completed with simple processing to reduce the processing cost, and at the same time, higher processing and assembly accuracy can be ensured.

[0016] In addition, in some embodiments, the guide plate component includes: a guide plate that extends along the length direction, and on the side of the guide plate facing the first guide rail component and the side facing the second guide rail component, a plurality of mounting holes are provided at a certain distance from the edge along the length direction at certain intervals; a plurality of pin shafts, and the plurality of pin shafts are respectively mounted in one of the plurality of mounting holes in the central region of their axial directions; and a plurality of bearings, and the plurality of bearings are respectively mounted in pairs at both ends of one of the plurality of pin shafts, and the sliding part is constituted by the pin shaft and the bearing. According to the above structure, the load generated by a sliding object such as a drawer can be scattered and distributed in the length direction of the guide rail device, and local stress concentration can be avoided, so that the durability of the guide rail device is strong. In addition, during maintenance, each bearing can be replaced one by one, and the maintenance cost can be reduced.

[0017] In addition, in some embodiments, the pin shaft is provided with locking portions for respectively performing axial positioning of the pin shaft relative to the guide plate and axial positioning of the bearing relative to the pin shaft. According to the above structure, accurate positioning of the pin shaft and the bearing can be achieved, further improving the assembly accuracy.

[0018] In addition, in some embodiments, the first guide rail component and the second guide rail component form the opening portion extending along the length direction at the central position in the width direction of the side surface, and a sliding track for sliding relative to the guide plate component is formed inside, and the side portions of the guide plate component provided with the sliding parts respectively enter the sliding tracks of the first guide rail component and the second guide rail component. According to the above structure, relative sliding between the guide rail component and the guide plate component can be achieved.

[0019] In addition, in some embodiments, the opening penetrates through the corresponding guide rail component only at one end in the length direction, and a contact portion for contacting the guide plate component is formed at the other end. According to the above structure, it is possible to use this contact portion for limiting without additionally providing a limiting portion.

[0020] In addition, in some embodiments, the guide rail device further includes a limiting portion that limits the relative sliding range of the first guide rail component and the second guide rail component by contacting the bearing. The limiting portion is provided inside the first guide rail component and the second guide rail component, and a gap through which the guide plate can pass is formed. According to the above structure, it is possible to limit the sliding of the guide rail device without hindering the sliding of the guide plate inside the guide rail component.

[0021] In addition, in some embodiments, a notch portion is formed at a position of the limiting portion corresponding to the pin shaft. The notch portion is formed to allow the pin shaft without the bearing to pass through but not the bearing. According to the above structure, by selectively disassembling and assembling the bearing, it is possible to change the bearing that contacts the limiting portion, change the sliding stroke of the guide rail, and thus lengthen or shorten the sliding range of the guide rail device, and appropriately select the pulling length of the drawer according to the size of the stored item.

[0022] In addition, in some embodiments, the guide rail device is configured such that the strength of the bearing on the outer side in the pulling direction is higher than that of the bearing on the inner side in the pulling direction, or the interval between the bearings on the outer side in the pulling direction is smaller than that of the bearings on the inner side in the pulling direction. In addition, the guide rail device may also be configured such that the strength of the bearing on the inner side in the width direction is higher than that of the bearing on the outer side in the width direction. In addition, the guide rail device may also be configured such that the strength of the bearing located below is higher than that of the bearing located above, or the size of the bearing located below is larger than that of the bearing located above, or the number of bearings located below is more than that of the bearings located above. According to the above structure, it is possible to further improve the rigidity and strength of the entire guide rail device and improve the durability of the guide rail device.

[0023] In addition, in some embodiments, in the guide plate, a plurality of through holes are provided at positions that do not overlap with the bearing in the length direction. According to the above structure, it is possible to ensure the strength of the portion of the guide plate component where the bearing is provided while reducing the weight of the guide rail device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view showing the overall structure of a guide rail device according to an embodiment of the present invention.

[0025] Figure 2 is a front view showing the overall structure of a guide rail device according to an embodiment of the present invention.

[0026] Figure 3 It is a sectional view and a front view showing the structure of the guide rail component in the guide rail device of the present utility model.

[0027] Figures 4A - 4C It is a view showing the structure of the guide plate component in the guide rail device of the present utility model, Figure 4A is the front view of the guide plate component, Figure 4B is the top view of the guide plate component, Figure 4C is Figure 4B the sectional view at the A-A line in

[0028] Figure 5 It is a view showing the structure of the guide plate in the guide plate component.

[0029] Figure 6 It is a view showing the structure of the pin shaft in the guide plate component.

[0030] Figure 7 It is a view showing the structure of the limiting portion.

[0031] Figures 8A - 8B It is a view showing the positional relationship between the components in the assembled state of the guide rail device, Figure 8A is the front view of the guide rail device in the assembled state, Figure 8B is the sectional view showing the positional relationship between the components.

[0032] Figure 9 It is a view showing a modified example of the limiting portion in the present utility model.

[0033] Explanation of reference numerals

[0034] 1 First guide rail component, 2 Second guide rail component, 11 Opening portion, 12 Slideway, 3 Guide plate component, 31 Guide plate, 31a, 31b Mounting holes, 31c Through hole, 32 Pin shaft, 32a, 32b Locking portions, 33 Bearing, 4, 4A Limiting portion, 4a Notch portion, 5 Baffle. Detailed implementation manners

[0035] Hereinafter, some implementation manners of the present utility model will be described with reference to the drawings. However, the following implementation manners only exemplarily show the preferred structures of the present utility model and do not limit the scope of the present utility model to these structures. In addition, for the convenience of description, the dimensions of each part are schematically shown in each drawing, and the ratio in the drawing is sometimes inconsistent with the actual ratio. In addition, in the following implementation manners, the sliding direction of the guide rail device is sometimes referred to as the length direction, the direction in which the guide rails on both sides are arranged is referred to as the width direction, and the direction orthogonal to the length direction and the width direction is referred to as the height direction.

[0036] Figure 1 andFigure 2 FIG. 1 is a perspective view and a front view showing the overall structure of a guide rail device according to an embodiment of the present utility model. As Figure 1 and Figure 2 shown, the guide rail device of this embodiment has a three-section guide rail structure, including a first guide rail member 1 and a second guide rail member 2 arranged side by side (in this embodiment, on both sides in the up-down direction), and a guide plate member 3 disposed between the first guide rail member 1 and the second guide rail member 2. The guide plate member 3 is slidably connected to the first guide rail member 1 on the upper side and slidably connected to the second guide rail member 2 on the lower side. In this embodiment, the first guide rail member 1 is, for example, a sliding guide rail that is connected to a sliding object such as a drawer by means of screw connection or the like and drives the sliding object to slide along the guide plate member 3. The second guide rail member 2 is, for example, a fixed guide rail that is fixed to a fixed object such as a cabinet via a fixed bracket or the like and allows the guide plate member 3 to slide. However, the first guide rail member 1 may be a fixed guide rail and the second guide rail member 2 may be a sliding guide rail. In addition, the guide rail device may be arranged in a direction other than the up-down direction.

[0037] In this embodiment, the first guide rail member 1 and the second guide rail member 2 have substantially the same cross section. Figure 3 FIG. 2 shows the first guide rail member 1 with the second guide rail member 2 omitted. As Figure 3 shown, the first guide rail member 1 is generally in the shape of a square tube, has an opening 11 extending along the length direction of the first guide rail member 1 at the central position in the width direction on one side surface, and forms a sliding track 12 inside for sliding relative to the guide plate member 3. The opening 11 has a width slightly larger than the width dimension of the guide plate 31 described later, and can accommodate the guide plate 31 and allow the corresponding guide rail member to move relative to the guide plate member 3 in the pulling direction. The first guide rail member 1 is a square tube formed by milling a metal profile to form the opening 11. Thus, compared with a guide rail member formed by bending, the processing operation can be quickly completed with simple processing to reduce the processing cost, and at the same time, a high processing and assembly accuracy can be ensured. In addition, since multiple bendings are not required, a material with a relatively thick thickness can be used, and thus the rigidity and strength of the entire guide rail member can be improved.

[0038] In this embodiment, in order to obtain high dimensional accuracy and good surface finish, the square tube forming the guide rail member uses a cold-drawn metal profile with a thickness of 4 mm, but it is not limited thereto.

[0039] In addition, in this embodiment, the opening of the guide rail member is formed to penetrate the guide rail member in the length direction. However, according to actual needs, it may also be formed to penetrate only one end of the guide rail member in the length direction and form a contact portion for contacting the guide plate member 3 at the other end, so that there is no need to additionally provide a limiting portion at this end.

[0040] Moreover, in the present embodiment, by making the first guide rail member 1 and the second guide rail member 2 have substantially the same structure, the structure of the guide rail member can be simplified and the processing cost can be reduced.

[0041] As Figures 4A - 4C shown, the guide plate member 3 includes a guide plate 31, a plurality of pin shafts 32 mounted on the guide plate 31, and a plurality of bearings 33 mounted on the pin shafts 32.

[0042] As Figure 5 shown, the guide plate 31 is in the shape of a flat plate extending along the length direction. On both side portions of the guide plate 31, a plurality of mounting holes 31a, 31b for mounting the pin shafts 32 are provided at intervals along the length direction at positions spaced a certain distance from the edges. In the present embodiment, two mounting holes 31a, 31b are respectively mounted, and one of the mounting holes 31a, 31b is respectively provided in the end regions on both sides in the length direction of the guide plate 31, but it is not limited thereto, as long as the number of each mounting hole is two or more and at least one is respectively provided in the end regions on both sides in the length direction of the guide plate, the number and position of the mounting holes can be appropriately changed as needed. By adopting the flat plate-shaped guide plate 31, compared with the guide plate formed by bending processing, the processing cost can be reduced, and at the same time, higher processing and assembly accuracy can be ensured. In addition, since multiple bendings are not required, a material with a relatively thick thickness can be used, and thus the rigidity and strength of the entire guide plate can be improved.

[0043] As Figure 6 shown, the pin shaft 32 is a stepped shaft formed by turning processing or the like. Through the locking portions 32a, 32b in the axial direction of the pin shaft 32, axial positioning of the pin shaft 32 relative to the guide plate 31 and axial positioning of the bearing 33 relative to the pin shaft 32 are respectively performed as Figure 4C shown. The pin shaft 32 is assembled in the mounting holes 31a, 31b of the guide plate 31 in an interference fit manner in the central region in the axial direction and is fixed to the guide plate 31 by welding or the like.

[0044] The bearing 33 is an enclosed rolling bearing. The bearing 33 is fastened to the pin shaft 32 by being assembled in pairs at both ends of the pin shaft 32 in an interference fit manner and mounting elastic retaining rings on the outer sides in its axial direction.

[0045] In addition, the guide rail device further includes a limiting portion 4 that limits the relative sliding range of the guide rail member and the guide plate member by abutting against the bearing 33. The limiting portion 4 is provided inside the guide rail member and is fixed, for example, by welding or the like at a position spaced a certain distance (5 mm in the present embodiment) from the end of the guide rail member in the length direction. And the limiting portion 4 has a gap through which the guide plate 31 can pass. In the present embodiment, as Figure 7As shown, the limiting portion 4 is composed of a limiting plate having a shape matching the shape of the slideway inside the guide rail component, and is set to fix two limiting plates at an interval slightly larger than the width dimension of the guide plate 31 in the width direction to the guide rail component, but it is not limited thereto. As long as it can abut against the bearing 33 for limiting, any shape and number can be adopted. In addition, as Figure 2 shown, a baffle 5 can also be provided at the end of the guide rail component to cover the guide rail device from the outside.

[0046] Figure 8A And Figure 8B are diagrams showing the positional relationship between the components in the assembled state of the guide rail device. In the assembled state of the guide rail device, the upper and lower sides of the guide plate 31 provided with the pin shaft 32 and the bearing 33 respectively enter the slideways of the first guide rail component 1 and the second guide rail component 2, and the bearings 33 are respectively in contact with the inner walls of the slideways of the first guide rail component 1 and the second guide rail component 2 and can roll relative to the inner walls. The pin shaft 32 and the bearing 33 separately provided in the length direction constitute a sliding portion for the guide plate component 3 to slide in contact with the guide rail components 1 and 2. And the middle parts of the guide plate 31 in the up and down directions respectively pass through the openings of the first guide rail component 1 and the second guide rail component 2 and separate the first guide rail component 1 and the second guide rail component 2 by a certain distance, so that the first guide rail component 1 and the second guide rail component 2 do not interfere with each other. Thus, the first guide rail component 1 can freely slide along the guide plate component 3 via the above-mentioned sliding portion, and the guide plate component 3 can freely slide along the second guide rail component 2 via the above-mentioned sliding portion. And the movement of the first guide rail component 1 and the guide plate component 3 in the width direction can be restricted by the openings of the guide rail component.

[0047] In addition, in the assembled state of the guide rail device, the limiting portions 4 are respectively arranged on both sides in the width direction inside the guide rail component with the guide plate 31 therebetween, so as not to hinder the sliding of the guide plate 31 inside the guide rail component. When the guide rail device slides until any one of the bearings 33 abuts against the limiting portion 4, the limiting portion 4 limits the sliding of the guide rail device.

[0048] In this embodiment, since the guide rail component is composed of a metal profile and the guide plate component has a flat plate structure, the rigidity and strength of the guide rail component and the guide plate component are high and they are easy to process. While being able to reduce the processing cost, it can improve the processing and assembly accuracy of each component and reduce the movement gap between the guide rail component and the guide plate component. Thus, a guide rail device with high processing and assembly accuracy, high rigidity and high strength can be obtained at a low processing cost.

[0049] Moreover, by separately arranging a plurality of sliding parts composed of a pin shaft 32 and a bearing 33 along the length direction on the side of the guide plate member 3 facing the first guide rail member 1 and the side facing the second guide rail member 2, the contact points between the guide plate member 3 and the guide rail members 1 and 2 can be increased. At the same time, the bearings 33 can be dispersed and evenly distributed in the sliding direction to continuously guide the sliding of the guide rail, avoiding the offset between components. Therefore, the plurality of sliding parts also function as guide parts for guiding the mutually sliding components in the sliding direction. Through the above structure, the stability of the guide rail sliding and the synchronization of the two side guide rails can be improved, thereby preventing the drawer from falling off and avoiding safety risks.

[0050] Moreover, in this embodiment, the guide rail member and the guide plate member are both symmetrically structured in the height direction and the width direction, and the bearings of the sliding parts are dispersedly distributed on the guide plate member according to a preset pulling length. Therefore, the load generated by a sliding object such as a drawer can be evenly distributed on the guide rail device, avoiding local stress concentration, and thus the durability of the guide rail device is strong.

[0051] In addition, even when maintenance is required, since the bearings can use common rolling bearings alone without using a complex ball assembly additionally, it is not necessary to replace the entire bearing mechanism, and each bearing can be replaced one by one, which can reduce the maintenance cost.

[0052] In the above embodiment, the sliding range of the guide rail device is fixed and limited by the limiting part 4, but the guide rail device can also be set to be adjustable according to needs. Figure 9 It is a diagram showing a modified example of the limiting part in the present utility model. As Figure 9 shown, a notch part 4a is formed at a position of the limiting part 4A corresponding to the pin shaft 32. The notch part 4a is formed into a shape and size that allows the pin shaft 32 without the bearing 33 installed to pass through but does not allow the bearing 33 to pass through. By selectively disassembling and assembling the bearing 33, the bearing in contact with the limiting part can be changed, thereby changing the sliding stroke of the guide rail. Through this structure, the sliding range of the guide rail device can be lengthened or shortened, and the pulling length of the drawer can be appropriately selected according to the size of the stored items.

[0053] In addition, in the above embodiment, the guide rail device is arranged such that a plurality of identical bearings are arranged at constant intervals along the length direction on both the upper and lower parts of the guide plate member, but the arrangement of the bearings in the guide plate member can also be appropriately changed according to needs.

[0054] For example, when the drawer is inserted into the cabinet body, the loads exerted by the drawer and the stored items on the guide rail device are evenly distributed in the sliding direction of the guide rail device. However, after the drawer is pulled out, the loads exerted by the drawer and the stored items on the guide rail device tend to be on one side in the pulling-out direction of the guide rail device. In this case, the bearings on the outer side in the pulling direction bear a greater load than the bearings on the inner side in the pulling direction. Therefore, the guide rail device can also be configured such that the strength of the bearings on the outer side in the pulling direction is higher than that of the bearings on the inner side in the pulling direction by appropriately selecting bearings of different models and materials. Additionally, the guide rail device can also be configured such that the spacing between the bearings on the outer side in the pulling direction is smaller than that between the bearings on the inner side in the pulling direction.

[0055] For example, since both ends in the width direction of the drawer are supported by the guide rail device, the weight of the drawer and the stored items at the middle position in the width direction exerts a force in the shearing direction (i.e., downward) on the guide rail devices on both sides. In this case, the bearings on the inner side in the width direction bear a greater load than the bearings on the outer side in the width direction. Therefore, the guide rail device can also be configured such that the strength of the bearings on the inner side in the width direction is higher than that of the bearings on the outer side in the width direction by appropriately selecting bearings of different models and materials.

[0056] For example, the bearings located below in the height direction bear a greater load than the bearings located above in the height direction. Therefore, the guide rail device can also be configured such that the strength of the bearings located below is higher than that of the bearings located above by appropriately selecting bearings of different models and materials, or the size of the bearings located below can be made larger than that of the bearings located above, or the number of the bearings located below can be made more than that of the bearings located above.

[0057] Additionally, in the above-described embodiment, a buffer member such as an elastic material can also be provided at the limiting portion to buffer the abutting contact between the bearing and the limiting portion and reduce the collision noise.

[0058] Additionally, in the above-described embodiment, reinforcing portions such as ribs extending in the length direction or the up-and-down direction can also be provided on the guide plate to prevent the guide plate from bending.

[0059] Additionally, in the above-described embodiment, as Figure 5 described, a plurality of through holes 31c extending along the length direction can also be provided at positions on the guide plate that do not overlap with the bearings in the length direction, so as to ensure the strength of the portion of the guide plate member where the bearings are provided while reducing the weight of the guide rail device.

[0060] The above embodiments illustrate the preferred embodiments of the present utility model, but the present utility model is not limited thereto. It should be understood that the above embodiments are merely exemplary and not restrictive. Without departing from the gist of the present utility model, various obvious or equivalent modifications, substitutions, and combinations that those skilled in the art can make to the above details will be included within the scope of the claims of the present utility model.

Claims

1. A guide rail device for guiding the drawing and pulling of a drawer, characterized in that: The guide rail device comprises: a first guide rail component; a second rail member disposed side by side with the first rail member and movable relative to the first rail member in a pulling direction; and a guide plate component, the guide plate component is arranged between the first guide rail component and the second guide rail component, and is respectively slidably connected to the first guide rail component and the second guide rail component in the pulling direction, The first guide rail component and the second guide rail component are respectively made of metal profiles, and the guide plate component is a flat plate structure. The first guide rail component and the second guide rail component respectively have openings on the sides facing each other, and the openings receive the guide plate component and allow the corresponding guide rail component to move relative to the guide plate component in the pulling direction. A plurality of sliding portions are separately provided on a side portion of the guide member facing the first guide rail member and a side portion of the guide member facing the second guide rail member along a longitudinal direction of the guide member.

2. The guide rail device according to claim 1, characterized in that: The first guide rail component and the second guide rail component are square tubes formed by milling metal profiles.

3. The guide rail device according to claim 1, characterized in that: The first rail member and the second rail member have the same cross-section.

4. The guide rail device according to any one of claims 1 to 3, characterized in that: The guide plate component comprises: A guide plate extending along the length direction, wherein a plurality of mounting holes are respectively provided at a certain distance from an edge on a side of the guide plate facing the first guide rail component and a side of the guide plate facing the second guide rail component along the length direction at a certain interval; A plurality of pins, each of which is mounted in a central area of ​​the axial direction of the pins in one of the plurality of mounting holes; and A plurality of bearings, wherein the plurality of bearings are respectively installed in pairs at both ends of one of the plurality of pins, The sliding portion is constituted by the pin shaft and the bearing.

5. The guide rail device according to claim 4, characterized in that: The pin shaft is provided with a locking portion for axially positioning the pin shaft relative to the guide plate and for axially positioning the bearing relative to the pin shaft.

6. The guide rail device according to any one of claims 1 to 3, characterized in that: The first guide rail member and the second guide rail member form the opening extending along the length direction at the center position in the width direction of the side surface, and form a slideway inside thereof for sliding relative to the guide plate member. The side portion of the guide plate member provided with the sliding portion enters into the slideways of the first guide rail member and the second guide rail member, respectively.

7. The guide rail device according to claim 6, characterized in that: The opening portion penetrates the corresponding guide rail member only at one end in the longitudinal direction, and forms an abutment portion for abutting against the guide plate member at the other end.

8. The guide rail device according to claim 4, characterized in that: The guide rail device further includes a stopper that limits the relative sliding range of the first guide rail member and the second guide rail member by abutting against the bearing. The limiting portion is disposed inside the first guide rail component and the second guide rail component, and forms a gap through which the guide plate can pass.

9. The guide rail device according to claim 8, characterized in that: A notch is formed at a position of the stopper corresponding to the pin, and the notch is formed so as to allow the pin without a bearing to pass through but not allow the bearing to pass through.

10. The guide rail device according to claim 4, characterized in that: The guide rail device is configured so that the strength of the bearing on the outer side in the pulling direction is higher than the strength of the bearing on the inner side in the pulling direction, or the interval between the bearings on the outer side in the pulling direction is smaller than the interval between the bearings on the inner side in the pulling direction.

11. The guide rail device according to claim 4, characterized in that: The guide rail device is provided so that the strength of the bearing on the inner side in the width direction is higher than the strength of the bearing on the outer side in the width direction.

12. The guide rail device according to claim 4, characterized in that: The guide rail device is configured so that the strength of the lower bearing is higher than that of the upper bearing, or the size of the lower bearing is larger than that of the upper bearing, or the number of the lower bearings is greater than that of the upper bearings.

13. The guide rail device according to claim 4, characterized in that: In the guide plate, a plurality of through holes are provided at positions that do not overlap with the bearing in the longitudinal direction.

Images