Guide rail with rolling device and sunshade equipment

Abstract

The present application provides a guide rail and sunshade equipment containing a rolling device, which relates to the field of sunshade technology, including a connecting seat, a first fastener, a second fastener, a third fastener, a follower element, and a slide rail. The connecting seat is arranged at the end of the slide rail, and the connecting seat is provided with a first groove, a second groove, a fourth groove, a first through hole, a second through hole, a third through hole, a fourth through hole, a first flange, a second flange, a third flange, and a fourth flange. The first groove and the second groove are used to place the first fastener, and the first through hole and the second through hole are used to place the second fastener. The follower element is connected to the connecting seat through the first fastener and the second fastener, and the slide rail includes a fifth through hole, a sixth through hole, a first notch, a second notch, and a fifth groove. The connecting seat is connected to the slide rail through the third fastener. The present application uses a follower element to act on the end of the guide rail and the introduction end of the covering, and has the characteristics of axial connection, small size, and reduced friction when the covering is working.

Description

Technical Field

[0001] The present application relates to the field of sunshade technology, and in particular to a guide rail and sunshade equipment containing a rolling device. Background Art

[0002] The roller tube of the roller blind in the sunshade device is axially fixed. The fabric is retracted and released as the roller tube is retracted to achieve the shading effect. If the roller blind needs to achieve the windproof effect, guide rails need to be set on both sides of the fabric. The guide rails can only move slightly. Since the retraction and release of the fabric will cause the fabric perpendicular to the roller tube to displace and form friction with the guide groove, a sliding mechanism is required to achieve the horizontal adjustment of the roller blind. Because the travel of the sliding mechanism is limited by the installation rail, the travel is not enough, and it is impossible to completely ensure the overlap and parallelism of the fabric and the guide rail.

[0003] The existing technology is to set an inverted triangle introduction groove at the upper end of the guide rail where the fabric is introduced, and blunt the two sides of the guide rail to reduce the friction caused by the sharp angle or sharp edge of the fabric and the guide rail. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present application provides a guide rail and a sunshade device including a rolling device, wherein the guide rail has the characteristics of reducing friction, being small in size, and rolling guidance. The present application includes the following solutions.

[0005] In the first aspect, the present application provides a guide rail containing a rolling device, the guide rail includes a connecting seat, a first fastener, a second fastener, a third fastener, a follower element, and a slide rail. The connecting seat is arranged at the end of the slide rail, and the connecting seat is provided with a first groove, a second groove, a fourth groove, a first through hole, a second through hole, a third through hole, a fourth through hole, a first flange, a second flange, a third flange, and a fourth flange. The first groove and the second groove are used to place the first fastener, and the first through hole and the second through hole are used to place the second fastener. The follower element is connected to the connecting seat through the first fastener and the second fastener, and the slide rail includes a fifth through hole, a sixth through hole, a first notch, a second notch, a third notch, a fourth notch, and a fifth groove. The connecting seat is connected to the slide rail through the third fastener.

[0006] The guide rail of the present application is provided with a rolling device at the end of the guide rail. The rolling device serves as the introduction port of the guide rail and has the characteristic of reducing friction. It can reduce the friction generated when the fabric is introduced into the guide rail, thereby improving the service life of the fabric. The connecting seat is connected to the slide rail in an axial position, which reduces the volume of the side connection and the structural redundancy caused by connection and tightening, and rationally utilizes the axial space of the guide rail.

[0007] Therefore, the guide rail containing the rolling device of the present application has the characteristics of simple processing, reduced friction and small size.

[0008] In one implementation, the slide rail is made of metal or plastic. For example, the slide rail is made of aluminum alloy or PVC and is processed by die extrusion.

[0009] In this implementation, the fifth through hole, the sixth through hole, the first notch, the second notch, the third notch, the fourth notch, and the fifth groove are simply formed by extruding the slide rail through a mold without complicated machining, which is conducive to the axial installation of the connecting seat.

[0010] In one implementation, the connecting seat is provided with a flange and connection positioning features for connecting and fastening to the slide rail. Correspondingly, the slide rail is also provided with features for connecting and positioning with the connecting seat. The axis center of the fifth through hole and the axis center of the sixth through hole on the slide rail coincide with the axis center of the third through hole and the axis center of the fourth through hole on the connecting seat. The first notch and the second notch of the slide rail are used for connection and positioning with the connecting seat. The fifth through hole and the sixth through hole are used for connection and fastening with the connecting seat. The contour center of the fifth groove coincides with the contour center of the fourth groove.

[0011] In this implementation, the third flange and the fourth flange of the connecting seat are connected to the first slot and the second slot of the slide rail. The first slot and the second slot play a positioning role, and the fifth through hole and the sixth through hole play a connecting and fastening role. The connecting seat is connected to the slide rail through the third fastener, thereby realizing the axial connection between the connecting seat and the slide rail, thereby reducing the volume of the connecting seat and reducing the structural redundancy of its connection on the non-axial surface.

[0012] In one implementation, the connection seat is made of metal or plastic and is formed by machining, mold injection molding, or die casting. The first fastener, the second fastener, and the third fastener are cylindrical connectors with threaded features.

[0013] In one implementation, the first fastener is placed in the first groove and the second groove. The first groove and the second groove limit and position the first fastener. The first fastener can only move along the direction of the opening of the first groove and the second groove.

[0014] In one implementation, the second fastener passes through the follower element, the first through hole, and the second through hole to be connected to the first fastener.

[0015] In the above three implementation methods, considering that there are multiple connection features on the connecting seat, it is preferably processed and formed by mold injection molding or metal die-casting. The first flange and the second flange on the connecting seat play the role of fitting one end face of the axial direction of the follower element, which allows the inner ring of the follower element to be tightened while the outer ring can rotate.

[0016] In one implementation, the follower element is a cylindrical part with a rotatable function such as a roller, cam, bearing, etc. The radial surface of the follower element is tangent to one side of the fifth groove of the slide rail, and the axial surface of the follower element coincides with the other end surface of the fifth groove.

[0017] In one implementation, the covering object enters the fifth groove tangentially from the radial surface of the follower element, a limiting element is provided on one end of the covering object, the limiting element slides in the fifth groove, and the fifth groove is used for guiding and sliding of the limiting element.

[0018] In this implementation, the axial direction of the follower element is fixed, and its radial surface is rotatable. The radial and axial surfaces of the follower element are positioned so that the cover enters the fifth groove in a rolling tangential manner, thereby reducing the friction between the cover and the guide rail.

[0019] In a second aspect, the present application provides a sunshade device, including a covering object and a guide rail provided by any of the above-mentioned implementation methods, wherein the guide rail is used for guiding, limiting and sliding the covering object.

[0020] The sunshade device provided by the present application uses the guide rail provided by the first aspect of the present application for guiding, limiting and sliding. Because the guide rail provided by the first aspect of the present application has a rolling device, the friction force is small and the volume is small, which increases the service life of the cover of the sunshade device of the present application.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief description of the drawings required for the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present application, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0023] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the external structure of the connecting seat in the embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of a front view of a connecting socket in an embodiment of the present application;

[0026] Figure 3 This is a schematic top view of the connecting seat in the embodiment of the present application;

[0027] Figure 4This is a bottom view schematic diagram of the connecting seat in the embodiment of the present application;

[0028] Figure 5 This is a left side schematic diagram of the connecting socket in the embodiment of the present application;

[0029] Figure 6 This is an exploded schematic diagram of the guide rail in the embodiment of the present application;

[0030] Figure 7 This is a schematic diagram of the appearance of the assembly structure of the guide rail in the embodiment of the present application;

[0031] Figure 8 This is one of the schematic diagrams of the appearance structure of an implementation method of the connecting socket in the embodiment of the present application;

[0032] Fig. 9 A schematic diagram of the structural appearance of some parts of the sunshade device in the embodiment of the present application;

[0033] Fig.10 This is a schematic diagram of the structural appearance of the assembly of the limiting element and the guide rail of the covering in the embodiment of the present application;

[0034] Fig.11 This is a schematic diagram of the structure and appearance of the guide rail in the embodiment of the present application from a front view;

[0035] Fig.12 This is a schematic diagram of the structural appearance of an implementation method of the connection seat and the slide rail of the present application;

[0036] Fig.13 This is a schematic diagram of the planar structural appearance of the slide rail of the present application. DETAILED DESCRIPTION

[0037] The following is a detailed description of the embodiments of the utility model, and examples of the embodiments are shown in the drawings, where the same reference numerals are used to represent the same component or the same component, and only one of the parts or components may be used as an example to mark a component or the same component. For the same components in the embodiments of the present application, the figure may only use one of the parts, or multiple different features or components in a part as an example to mark the reference numerals. It should be understood that the reference numerals are also applicable to other identical parts or components. In addition, the components in the drawings are not drawn to scale, and the dimensions and sizes of the components shown in the drawings are only exemplary and should not be understood as limiting the present application.

[0038] In the description of the embodiments of the present application, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate positions or positional relationships that are defined relative to the positions or positions of the components schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for description and clarification relative to the drawings, rather than indicating or implying that the device or part referred to must have a specific position, or be constructed and operated in a specific position. It can change accordingly according to the change in the position of the components placed in the drawings, and therefore cannot be understood as a limitation of the present application. In addition, the terms "coaxial", "horizontal", "coincident", "vertical", "tangent", "parallel", etc. involved in the present application are not "coaxial", "horizontal", "coincident", "vertical", "tangent", "parallel" in the strict sense, but are within the allowable error range.

[0039] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0041] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] For the convenience of description, the direction of the edge 320 of the slide rail 210 is defined as the X direction (eg Fig.11 The direction perpendicular to the edge 320 and parallel to the edge 321 is the Y direction (e.g., the horizontal direction of the paper shown in the figure, also referred to as the Y-axis direction), and the direction perpendicular to the edge 320 and perpendicular to the edge 321 is the Z direction (e.g., Fig.12The direction perpendicular to the paper surface shown in the figure may also be referred to as the Z-axis direction). Similarly, the definitions of the X, Y, and Z directions also apply to the drawings to be described later. If not specifically stated, the X, Y, and Z directions include their positive and negative directions. It should be noted that the above definitions of the X, Y, and Z directions are only for the convenience of describing the positional relationship and connection relationship between the various components in the embodiments of the present application, and should not be understood as limiting the embodiments of the present application.

[0043] See also Figures 1 to 12 A guide rail containing a rolling device of the present application includes a connecting seat 1, a first fastener 100, a second fastener 101, a third fastener 106, a follower element 3, and a slide rail 210. Wherein: the connecting seat 1 is arranged at the end of the slide rail 210, and the connecting seat 1 is provided with a first groove 10, a second groove 11, a fourth groove 230, a first through hole 20, a second through hole 21, a third through hole 22, a fourth through hole 23, a first flange 30, a second flange 31, a third flange 32, and a fourth flange 33. The first groove 10 and the second groove 11 are used to place the first fastener 100, and the first through hole 20 and the second through hole 21 are used to place the second fastener 101. The follower element 3 is connected to the connecting seat 1 through the first fastener 101 and the second fastener 100. The slide rail 210 includes a fifth through hole 24, a sixth through hole 25, a first notch 211, a second notch 212, a third notch 260, a fourth notch 261, and a fifth groove 231. The connecting seat 1 is connected to the slide rail 210 through the third fastener 106.

[0044] In one embodiment, the material of the slide rail 210 is metal or plastic. For example, the material of the slide rail 210 is aluminum alloy or PVC, which is formed by die extrusion. In this way, the hole features and groove features of the slide rail 210 can be simply made, and the tolerances of the parallelism, flatness and straightness of these features are also small, so that the fifth groove 231 of the slide rail 210 can have the functions of guiding, limiting and sliding.

[0045] The guiding, limiting, and sliding functions described in the above embodiments refer to the fifth groove having the functions of guiding, positioning, and restraining the covering object. Figure 7 , Fig. 9 ,in Fig. 9The present invention exemplarily shows an assembly of some parts of a sunshade device as a windproof roller shutter and a partially enlarged schematic diagram, wherein the figure shows a structural appearance diagram of a covering 300 working in a guide rail and cooperating with the guide rail, wherein the guide rail is arranged inside the side rail 410 of the windproof roller shutter, wherein the covering 300 is arranged on a rotatable winding mechanism 400, and the covering 300 is located at the upper end of the guide rail. Limiting elements 301 (such as pull links, rubber strips, etc.) are provided at both ends of the covering 300 to prevent the covering 300 from making large movements in the Z and X directions. When the winding mechanism 400 rotates, the covering 300 enters the fifth groove 231 of the guide rail from the end of the guide rail, and the limiting element 301 can slide in the axial surface of the follower element 3 and the fifth groove 231. The guide rail is used to prevent the covering 300 from making large displacements in the X and Y directions to ensure the flatness of the covering 300.

[0046] The sunshade device refers to a device with a rotation function to roll up the covering object, such as a roller blind, a windproof roller blind, a ceiling curtain, etc. The covering object refers to an item with a sunshade and shielding function, such as a fabric, thermoplastic polyurethane (TPU), etc.

[0047] In one embodiment, one or more through holes or threaded holes are provided on the slide rail 210 for connection and fastening. Exemplarily, two through holes are provided on the slide rail 210, namely, the fifth through hole 24 and the sixth through hole 25. These two through holes may also be threaded holes with threaded features, which may be connected and fastened with the third fastener 106. The third fastener 106 is a cylindrical part with threaded features. Exemplarily, the third fastener 106 is a screw or a bolt.

[0048] In one embodiment, one or more grooves are provided on the slide rail 210 for connecting and positioning the connecting seat 1, or no grooves are provided. For example, the first groove 211 and the second groove 212 are used for connecting and positioning the connecting seat 1, wherein the third flange 32 and the fourth flange 33 on the connecting seat are respectively connected to the first groove 211 and the second groove 212, and the outer contour dimensions of the third flange 32 and the fourth flange 33 are less than or equal to the inner contour dimensions of the first groove 211 and the second groove 212.

[0049] In one embodiment, the connection seat 1 is made of plastic or metal and is formed by injection molding or die casting. For example, the connection seat 1 is made of plastic or aluminum alloy. The connection seat 1 is provided with a flange feature for connecting and fastening with the slide rail 210. For example, the connection seat 1 is provided with a third through hole 22 and a fourth through hole 23. The third through hole 22 and the fifth through hole 24 are coaxial, and the fourth through hole 23 and the sixth through hole 25 are coaxial. After the third fastener 106 passes through the third through hole 22 and the fourth through hole 23 and is connected and fastened to the fifth through hole 24 and the sixth through hole 25 on the slide rail, the connection seat 1 is fixed to the end of the slide rail 210. The connection seat 1 is connected in the axial direction of the slide rail 210, i.e., in the Y direction, so that the volume of the connection seat can be reduced and structural redundancy can be avoided.

[0050] In one embodiment, see Fig.12 , (a1) and (b1) in the figure respectively show the exploded schematic diagram and the assembly structure appearance diagram of the connecting seat and the slide rail 210. The connecting seat 1 and the slide rail 210 in the figure are an assembly example of connection in a non-axial direction. In the figure, the fifth flange 34 and the sixth flange 35 have through-hole features for connection and fastening in addition to the positioning function. Exemplarily, during assembly, the connecting seat 1 is first inserted into the third notch 260 and the fourth notch 261 of the slide rail 210, and then a tool or machining equipment (such as a bench drill or a hand drill) is used to drill a bottom hole required for the tapping 1 of the third fastener 106 on the slide rail 210 facing the fifth through hole 510 and the sixth through hole 511 located by the fifth flange 34 and the sixth flange 35, and then the third fastener 106 is used to connect and fasten. At this time, the third fastener 106 is a self-tapping screw.

[0051] Fig.12 The connection between the middle connecting seat and the slide rail 210 is a non-axial connection, and the volume ratio of the fifth flange 34 to the sixth flange 35 is Figure 1 The third flange 32 and the fourth flange 33 of another embodiment of the middle connecting seat are large in size, that is, the size needs to be increased in the Y direction so that the material thickness of the bottom hole drilled in the slide rail 210 is thicker away from the edge, so as to obtain a better fastening effect, but this also increases the volume of the connecting seat.

[0052] In one embodiment, the connection base 1 is made of metal, which is formed by die casting or machining. For example, the connection base 1 is made of aluminum alloy or zinc alloy. It can be regarded as a fastener and a connector, which does not need to be connected with the first fastener 100. Figure 8 The figure shows a side view of an embodiment in which the connecting seat 1 is made of metal material, wherein the first through hole 20 and the second through hole 21 are inner holes with threaded features, and the follower element 3 can be directly connected to the connecting seat 1 through the second fastener 101. This method can save the use of the first fastener 100, and there is no need to set a groove to place the first fastener 100.

[0053] In one embodiment, the connection base 1 is provided with a plurality of grooves for placing and constraining the position of fasteners. Exemplarily, the first groove 10 and the second groove 11 on the connection base 1 are used to place and constrain the first fastener 100, and the first fastener 100 can only be placed along the direction of the opening of the first groove 10 and the second groove 11. The first fastener 100 is a connector with an internal threaded hole, and exemplarily, the first fastener 100 is a nut.

[0054] In a further embodiment, after the first fastener is placed in the first groove 10 and the second groove 11 , the axis of the internal threaded hole 120 thereof is coaxial with the axis of the first through hole 20 and the axis of the second through hole 21 .

[0055] In a further embodiment, the follower element 3 is connected to the connecting seat 1 as a whole through a first fastener 100 and a second fastener 101. The second fastener 101 is a cylindrical connecting member with threaded features such as a bolt, a screw, etc. Exemplarily, the second fastener 101 is a bolt.

[0056] In one embodiment, the first through hole 20 and the second through hole 21 on the connection seat 1 are provided with a first flange 30 and a second flange 31 used as a stopper, which act on the axial surface of the follower element 3 to play a role of fastening and fitting. The follower element 3 is a part that can be fastened in the axial direction and can rotate in the radial direction, such as a bearing, a cam, a roller, etc. For example, the follower element 3 is described as a bearing. When the follower element 3 is connected and fastened by the first fastener 100 and the second fastener 101, the first flange 30 and the second flange 31 are respectively fastened to one end surface of the inner ring of the axial surface of the follower element 3, and the outer ring of the follower element 3 can rotate without interference, which can also reduce the friction of the follower element 3 when it moves.

[0057] In one embodiment, the follower element 3 is a flange-type bearing which can also achieve the above-mentioned effect of reducing friction. The inner ring and outer ring of the flange-type bearing are not on the same plane, so that when the inner ring is tightened, the outer ring can rotate, and the effect of no interference can also be achieved.

[0058] In one embodiment, the first flange 30 and the second flange 31 may also be replaced by fastener parts such as washers and gaskets.

[0059] In one embodiment, the fifth groove 231 is a groove composed of multiple vertical surfaces, which has a straight line feature so that the cover can slide inside it. In the present application, there is no limitation on its shape, which can be a rectangle, a trapezoid, a triangle, etc. For example, see Figure 6 and Fig.13, wherein the first surface 240, the second surface 241, the third surface 242, the fourth surface 243, the fifth surface 244, the sixth surface 245, and the seventh surface 246 in the fifth groove are all parallel to the Y axis and perpendicular to the X axis, and the third surface 242 coincides with the fourth surface 243, so that a straight cavity can be formed for the covering 300 to slide.

[0060] Please look back Figure 1 , Figure 6 , Figure 9-11 In one embodiment, the number of follower elements 3 is two or more, at least two, and one is placed at each end of the cover 301 moving in the X-axis direction. The radial surface 220 of the follower element 3 is tangent to the first surface 240 and the second surface 241 of the fifth groove 231, respectively. The axial surface 360 ​​of the follower element 3 coincides with the other end surface 361 of the fifth groove 231. The contour center of the fourth groove 230 of the connecting seat 1 coincides with the contour center of the fifth groove 231 of the first slide rail 210. In this way, when the winding mechanism 400 containing the cover 300 is displaced in the X-axis direction, since the cover 300 passes through the radial surface 220 of the follower element 3 and is partially placed in the fifth groove 231, the cover 300 may generate friction with the follower element 3 under the influence of gravity and cause it to rotate. At this time, the follower element 3 plays the role of introducing the cover 300 and reducing friction. The following element 3 is tangent to the first surface 240 and the second surface 241 of the fifth groove 231, so that the covering object 300 enters the fifth groove 231 in a tangential or parallel manner, thereby improving the service life of the covering object 300. The axial surface 360 ​​of the following element 3 coincides with the other surface 361 of the fifth groove 231, playing the same guiding, limiting and sliding role as the fifth groove of the slide rail 210.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of protection of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A guide rail with a rolling device, characterized in that: The invention comprises a connecting seat, a first fastener, a second fastener, a third fastener, a follower element and a slide rail. The connecting seat is arranged at the end of the slide rail. The connecting seat is provided with a first groove, a second groove, a fourth groove, a first through hole, a second through hole, a third through hole, a fourth through hole, a first flange, a second flange, a third flange and a fourth flange. The first groove and the second groove are used for placing the first fastener. The first through hole and the second through hole are used for placing the second fastener. The follower element is connected to the connecting seat through the first fastener and the second fastener. The slide rail comprises a fifth through hole, a sixth through hole, a first notch, a second notch, a third notch, a fourth notch and a fifth groove. The connecting seat is connected to the slide rail through the third fastener.

2. A guide rail with a rolling device as claimed in claim 1, characterized in that: The third through hole and the fourth through hole on the connecting seat coincide with the axes of the fifth through hole and the sixth through hole of the slide rail respectively.

3. A guide rail with a rolling device as claimed in claim 2, characterized in that: The connecting seat has the functions of connecting and fastening.

4. A guide rail with a rolling device as claimed in claim 1, characterized in that: The connecting seat is provided with a flange for axial connection with the slide rail, and the connecting seat is connected in the axial direction of the slide rail; or, the connecting seat is connected to the slide rail in a non-axial direction.

5. A guide rail with a rolling device as claimed in claim 1, characterized in that: One or more grooves are arranged on the slide rail, and the grooves are linear cavities.

6. A guide rail with a rolling device as claimed in any one of claims 1 to 4, characterized in that: The first flange and the second flange on the connecting seat act as a stopper, or, The first flange and the second flange are replaced by a gasket and a washer, which are used to fit one axial end face of the follower element to tighten the axial direction of the follower element.

7. A guide rail with a rolling device as claimed in claim 1, characterized in that: The number of follower elements is 2 or more, the radial surface of the follower element is tangent or nearly tangent to the first surface and the second surface of the fifth groove of the slide rail, and one end surface of the axial surface of the follower element coincides with the third surface of the fifth groove.

8. A sunshade device, characterized in that It comprises a covering and a guide rail containing a rolling device as described in any one of claims 1 to 7, wherein the guide rail is used for guiding, limiting and sliding the covering.

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