A guardrail fixing structure, guardrail fixing assembly and guardrail assembly

Abstract

The patent of the present invention discloses a guardrail fixing structure, a guardrail fixing assembly and a guardrail assembly, comprising: a fixing frame, the fixing frame is provided with a guardrail slot, and a through screw hole is provided on the side wall of the guardrail slot; an adjusting member, which is rotatably connected to the fixing frame or the main structure, and the adjusting member is provided with an external thread; a clamping member, comprising a fixed pressing portion, a threaded portion and a transmission portion; the transmission portion is provided with gear teeth in the circumferential direction of the screw hole axis, the threaded portion passes through the screw hole, the clamping portion is located on the outside of the clamping member, and forms a fixed position of the guardrail with the guardrail slot; wherein the adjusting member can drive the clamping member to rotate to fix the guardrail in a fixed position; this patent arranges meshing adjusting members and clamping members on the side walls of the guardrail slot of the fixing frame, and the rotating adjusting member can realize the feeding of the clamping member into the inside of the guardrail slot to realize the fixation of the guardrail; the adjusting member and the clamping member occupy a small space, which is convenient for reducing the overall volume of the guardrail fixing assembly, and the installation and disassembly operations are simple.

Description

Technical Field

[0001] The invention relates to the field of guardrail equipment and fixing structures, and in particular to a guardrail fixing structure, a guardrail fixing component and a guardrail component. Background Art

[0002] The guardrail is a type of plate structure that serves as a partition or protection. The guardrail is mainly made of common materials such as glass and acrylic. In order to make the guardrail easy to disassemble and maintain, and to improve the aesthetics, a fixed structure is often used in the prior art to fix one side of the guardrail. However, in the prior art, the fixed structure of the guardrail is often complex, occupies a large space, and is complicated to install and disassemble. Therefore, whether there is a guardrail fixing structure with a simple structure, small space, and easy installation and disassembly is a technical problem that technicians in this field are looking forward to solving. Summary of the invention

[0003] The purpose of the present invention is to provide a guardrail fixing structure, a guardrail fixing assembly and a guardrail assembly, which can be used to install the guardrail on various main structures. The overall volume of the guardrail fixing structure is small, which is particularly suitable for installation locations with narrow spaces. The installation and disassembly steps of the guardrail are simple.

[0004] The technical solution provided by the present invention is as follows:

[0005] A guardrail fixing structure, used for fixing the guardrail on a main structure, comprises:

[0006] A fixing frame that can be fixed to the main structure, the fixing frame is provided with a fence slot, a through screw hole is provided on a side wall of the fence slot, and the axis of the screw hole is a first axis;

[0007] An adjusting member is rotatably connected to the fixing frame or the main structure, the rotation axis is the second axis, and the adjusting member is provided with an external thread;

[0008] The clamping member comprises a fixed pressing part, a threaded part and a transmission part; the transmission part is provided with gear teeth in the circumferential direction of the first axis, the threaded part passes through the screw hole, the pressing part is located outside the clamping member, and forms a fixed position of the fence with the fence slot; wherein,

[0009] The adjusting member can drive the pressing member to rotate so as to fix the guardrail at the fixed position.

[0010] The main structure can be a structure such as stair steps, floor slabs, ship decks, window sills, etc. The guardrail can be a plate-like structure that is fixed on only one side, such as a hand guard beside the staircase, a protective plate at the edge of the floor slab, etc. The guardrail can play a partition and protective effect. The material of the guardrail can be various materials such as glass, acrylic or ceramic. The fixing frame can be fixed on the surface of the main structure, or it can be buried inside the main structure. The main structure can be provided with a corresponding opening as long as the guardrail can be inserted into the guardrail slot. After the fixed structure is installed, the guardrail is inserted into the guardrail slot, and then the adjusting member is rotated. The adjusting member drives the pressing member to rotate, so that the pressing member is fed into the guardrail slot, so that the pressing part abuts against the guardrail, and the pressing part and the inner wall of the guardrail slot press the guardrail from both sides to fix the guardrail. The adjusting member cooperates with the pressing member to convert the rotation in the second axis direction into the rotation in the second direction. The structure occupies a small space, which is conducive to reducing the overall volume of the guardrail fixing structure.

[0011] Further preferably, the pressing part, the threaded part and the transmission part are arranged in sequence. At this time, the transmission part is located outside the fence slot, which is beneficial to reducing the lateral size of the fence slot and reducing the overall volume of the fence slot, so that the fence fixing structure is suitable for a relatively narrow space.

[0012] Further preferably, the pressing part has a buffer pad for contacting with the guardrail. The material of the buffer pad can be a flexible material such as rubber or nylon that can undergo a certain deformation. The pressing part contacts the guardrail through the buffer pad, and the buffer pad can disperse the force between the pressing part and the guardrail to make the force on the surface of the guardrail uniform. If the guardrail is made of materials such as acrylic, the buffer pad can be provided to prevent the pressing part from leaving an indentation on the surface of the guardrail; if the guardrail is made of materials such as glass, the buffer pad can be provided to prevent the guardrail from breaking due to concentrated force. The buffer pad can be sleeved on the surface of the remaining parts of the pressing part, and can also be fixed by glue.

[0013] Further preferably, the rotating part is a gear, and the adjusting member is a screw. The screw can be rotatably connected to the fence slot through a bearing, so that the screw does not feed when rotating, and the size of the gear can be selected according to parameters such as the feed amount required by the pressing part, the friction between the threaded part and the screw hole, etc. The thickness of the gear is set so that the thread of the screw can always mesh with the gear during the feeding process of the pressing member.

[0014] Further preferably, the extension direction of the fence slot is a first direction, and along the first direction, the side wall height of the fence slot gradually decreases, and the side wall area of ​​the fence slot with the same width gradually decreases. The adjusting member and the pressing member are arranged along the first direction. The fence slot can be suitable for fences with inclined lower edges. Relatively speaking, the space required for the gear is smaller than the space required for the screw. Therefore, the screw and the gear are arranged along the first direction, and the spatial distribution is more reasonable, which further saves the space occupied by the fence fixing structure.

[0015] Further preferably, the end of the fixing frame away from the fence slot has a fixing plate extending in the lateral direction of the fence slot, and the fixing plate is provided with a fixing structure. The fixing structure on the fixing plate can exert a vertical force on the fixing frame as a whole, further improving the stability of the fixing frame. The fixing structure can be various commonly used mechanical fixing structures such as a threaded structure, a clamping structure, and a welding point.

[0016] Another object of the present invention is to provide a guardrail fixing assembly for fixing the guardrail, comprising:

[0017] A fence fixing structure having the above-mentioned characteristics, wherein the fence slot has a first opening, the first opening has extension parts extending to both sides respectively, the extension direction of the extension parts is a second direction, and the direction in which the fence is inserted into the fence slot is a third direction; and,

[0018] The main structure includes a base, two side panels and a cover plate; wherein,

[0019] The fixing structure is fixed on the base, and the two side panels are respectively fixed to the base and are located on both sides of the fence slot. The end of the side panel away from the base abuts against the extension part in the second direction; the cover plate abuts against the extension part in the third direction and has a second opening, and the fence can be inserted into the fence slot through the second opening.

[0020] The base can be a structure such as a concrete floor in a building, a cabin deck, etc. The side panels and cover panels can be made of common supporting or decorative materials such as stainless steel and ceramic tiles, which can be used to fix the guardrail fixing frame, and can also be used to hide the fixing frame for aesthetic purposes. The extension portion extends to both sides of the guardrail slot, so that a space for placing adjustment parts is formed on the outside of the outer wall of the guardrail slot, and the extension portion can provide a certain degree of protection for the adjustment parts. At the same time, the side panels and cover panels of the main structure can be fixed on the extension portion, which is convenient for the installation of the side panels and cover panels. After the main structure is installed, only the second opening can be directly seen from the appearance of the fixing assembly, and the second opening is for the guardrail to be inserted into the guardrail slot. When the guardrail needs to be replaced, the cover panel can be removed or a through hole can be opened on the cover panel, and a screwdriver can be inserted to adjust the adjustment part. The overall appearance of the fixing assembly is beautiful, and it is convenient for the replacement of the guardrail.

[0021] Further preferably, the angle between the second axis and the plane where the base is located is 60-90 degrees, which is convenient for the user to operate the adjustment member from above the guardrail fixing structure.

[0022] Further preferably, the cover plate is provided with a first through hole, the extended portion is provided with a second through hole, and the first through hole and the second through hole are located on the second axis. A corresponding screw structure can be provided on the adjusting member, and when the fence needs to be installed or removed, the adjusting member can be adjusted by inserting a screwdriver into the first through hole and the second through hole. The outer surface of the fence fixing assembly only has the first opening and the first through hole, which facilitates the hiding of the fixing frame and makes the device more beautiful as a whole.

[0023] Another object of the present invention is to provide a fence assembly, comprising

[0024] guardrails; and,

[0025] A guardrail fixing assembly having the aforementioned characteristics, wherein the guardrail is fixed at the fixing position.

[0026] This patent creatively sets meshing adjusting parts and pressing parts on the side wall of the fence slot of the fixing frame. The adjusting parts can be rotated to feed the pressing parts into the fence slot to fix the fence. The adjusting parts and pressing parts occupy a small space, which is convenient for reducing the overall volume of the fence fixing assembly, reducing the space it occupies, facilitating the embedding of the fence fixing assembly, reducing the installation space required, and making the device more beautiful as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0028] Figure 1 It is a structural schematic diagram of a guardrail assembly according to a specific embodiment of the present invention;

[0029] Figure 2 It is an enlarged view of the structure at A of a specific implementation mode of the present invention;

[0030] Figure 3 It is a schematic diagram of the relative position structure of the adjusting member and the pressing member in a specific embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of a pressing member according to a specific embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of a guardrail fixing structure of a specific embodiment of the present invention. Figure 1 ;

[0033] Figure 6 This is a schematic diagram of a guardrail fixing structure of a specific embodiment of the present invention. Figure 2 .

[0034] Description of Figure Numbers:

[0035] 10-railway; 20-main structure; 21-base; 22-side plate; 23-cover plate; 30-fixing frame; 31-railway slot; 32-fixing plate; 33-extension part; 40-adjusting member; 50-pressing member; 51-pressing part; 52-threaded part; 53-transmission part; 60-buffer pad; DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] As a specific example, Figure 1-4 As shown, a fence fixing structure is used to fix the fence 10 on a main structure 20, including: a fixing frame 30, the fixing frame 30 is provided with a fence slot 31, the side wall of the fence slot 31 is provided with an adjusting member 40 and a clamping member 50, the clamping member 50 includes a fixed pressing portion 51, a threaded portion 52 and a transmission portion 53, the transmission portion 53 is provided with gear teeth, the adjusting member 40 is provided with a matching thread, the side wall of the fence slot 31 is provided with a screw hole (not shown in the figure) matching with the threaded portion 52, the pressing portion 51 is located inside the fence slot 31, and forms a fixed position of the fence 10 between the pressing portion 51 and the side wall of the fence slot 31; the adjusting member 40 can drive the clamping member 50 to rotate, thereby fixing the fence 10 in the fixed position.

[0038] The opening direction of the fence slot 31 can be selected according to the purpose, position, installation direction of the fence 10 and other parameters of the main structure 20. The adjusting member 40 is rotatably connected to the fence slot 31, and its rotation axis is the second axis, and the external thread is arranged in the circumferential direction of the second axis. The clamping member 50 can rotate around the second axis, and the pressing part 51 refers to the part used to contact the surface of the fence 10 and directly apply pressure to the fence 10. The contact surface between the pressing part 51 and the fence 10 can be a plane, or a pin that can be inserted into the fence 10 can be provided, and these schemes are all within the protection scope of this patent. The threaded portion 52 is engaged with the screw hole on the side wall of the fence slot 31, so when the threaded portion 52 rotates, under the action of the screw hole, the threaded portion 52 will feed along the second axis direction, and the gear teeth arranged on the transmission part 53 are located in the circumferential direction of the first axis, and the number of teeth can be adjusted according to the feed amount of the clamping member 50. When the adjusting member 40 rotates around the first circumferential direction, the meshing action of the external thread and the gear teeth causes the pressing member 50 to rotate, and under the action of the threaded portion 52 and the screw hole, the pressing member 50 rotates and feeds on the first axis. The space between the pressing portion 51 and the side wall of the fence slot 31 is used to fix the fence 10.

[0039] At this point, a person skilled in the art can understand that the arrangement of the adjusting member 40 and the pressing member 50 in this patent is actually the key invention point of this patent. When the fixing member of the fence 10 is arranged in a narrow space, the cooperation of the adjusting member 40 and the pressing member 50 is used to convert the rotational action in the second axis direction into the rotational action and feeding action in the first axis direction, so that the user can install the situation on site. Without changing the setting of the pressing member 50, only adjusting the setting direction of the adjusting member 40 can make the fence fixing structure have different adjustment modes, thereby improving the compatibility of the device. At the same time, the structures of the adjusting member 40 and the pressing member 50 are simple, and the space saving makes the fence fixing structure suitable for extremely narrow installation space. The pressing member 50 can be arranged as follows: the transmission part 53, the threaded part 52 and the pressing part are arranged in sequence, or the threaded part 52, the transmission part 53 and the pressing part are arranged in sequence. The former adjusting member 40 is arranged inside the fence slot 31, and the latter adjusting member 40 is arranged outside the fence slot 31. The inner wall of the guardrail slot 31 may also be provided with a plurality of cushions 60 made of rubber or other materials to protect the guardrail 10 and prevent the guardrail 10 from being damaged by the guardrail slot 31 after being subjected to force. The above solutions are all within the protection scope of this patent.

[0040] like Figure 4As shown, the pressing part 51, the threaded part 52 and the transmission part 53 are arranged in sequence. At this time, the transmission part 53 is located outside the fence slot 31. The outside of the fence slot 31 only needs to leave space for the transmission part 53 and the adjustment member 40. The space required for the overall fence fixing structure is small, and it is suitable for a relatively narrow space. The pressing part 51 is provided with a buffer pad 60, and the buffer pad 60 wraps the rest of the pressing part 51, and the buffer pad 60 directly contacts the fence 10. The material of the buffer pad 60 can be a flexible material that can undergo a certain deformation, such as rubber or nylon. The pressing part 51 contacts the fence 10 through the buffer pad 60, and the buffer pad 60 can disperse the force between the pressing part 51 and the fence 10, so that the surface of the fence 10 is evenly stressed. If the guardrail 10 is made of acrylic or other materials, the buffer pad 60 can be provided to prevent the pressing part 51 from pressing marks on the surface of the guardrail 10; if the guardrail 10 is made of glass or other materials, the buffer pad 60 can be provided to prevent the guardrail 10 from breaking due to concentrated force. The buffer pad 60 can be sleeved on the surface of the other parts of the pressing part 51, or can be fixed by glue.

[0041] like Figure 3 As shown, the adjusting member 40 is a screw hole, and both ends of the screw rod are rotatably connected to the side wall of the fence slot 31 through bearings. The screw rod itself is easy to operate, and the screw hole can be rotated by a screwdriver or a corresponding mechanical transmission structure. The two ends of the screw rod are limited by the bearings. Therefore, when the screw rod is rotated, the screw rod will only rotate around the second axis, and will not feed in the direction of the second axis. The area below the screw rod can be used to place other devices other than the fence fixing structure, and it takes up less space. The transmission part 53 is a gear, and the screw rod can be installed near the gear at various angles. In this specific embodiment, the second axis direction of the screw rod is perpendicular to the ground, which is convenient for the user to bend over and use a screwdriver to adjust the adjusting member 40.

[0042] like Figure 3 As shown, the extension direction of the guardrail slot 31 is the first direction, and along the first direction, the height of the side wall of the guardrail slot 31 gradually decreases. The guardrail slot 31 is suitable for installation scenarios where the height may change, such as elevators and stairs. The guardrail slot 31 is set to be inclined so as to be suitable for the edge shape of the stairs. The upper and lower ends of the screw on the external thread need to be rotatably connected to the side wall of the guardrail slot 31, so the size of the screw in the height direction is relatively large relative to the transmission part 53. Therefore, the clamping member 50 is set in a direction with a lower height, so that the space outside the guardrail slot 31 can be fully utilized, and a larger space can be reserved in the lower half of the fixing frame 30, further making the guardrail fixing structure suitable for installation areas with narrow space.

[0043] like Figure 2As shown, a horizontally extending fixing plate 32 is provided at the bottom of the fixing frame 30, and a plurality of screw holes are provided on the fixing plate 32 as a fixing structure. When the fixing frame 30 is installed on the main structure 20, the fixing plate 32 can be fixed to the main structure 20 by expansion screws. The fixing plate 32 can support the fixing frame 30 as a whole in the vertical direction, thereby improving the overall stability of the fixing frame 30.

[0044] In a preferred embodiment, Figure 5 As shown, the difference from the above-mentioned embodiment is that the sizes of the threaded portion 52 and the pressing portion 51 are both larger, and the radial size of the pressing portion 51 is the same as the depth of the fence slot 31. The contact area between the pressing portion 51 and the fence 10 is increased, and the pressure between the pressing portion 51 and the fence 10 can be reduced to avoid damage to the fence 10. In actual production, the size of the pressing portion 51 can be adjusted according to the depth of the fence slot 31, the material type of the fence 10, and the material type of the pressing portion 51, and the adjusted solutions are all within the protection scope of this patent.

[0045] In a preferred embodiment, Figure 6 As shown, the difference from the aforementioned embodiment is that a clamping member 50 is provided on both side walls of the fence slot 31, and a matching adjusting member 40 is configured. At this time, a fixing position for fixing the fence 10 is formed between the two pressing parts 51, or between a single pressing part 51 and the other side wall. The second rotating shafts of the adjusting members 40 on both sides can be set at an angle, so that the fence slot 31 has adjustment functions in two directions. In actual production, a plurality of matching adjusting members 40 and clamping members 50 can be set on a single side wall or double side walls of the fence slot 31, and these schemes are all within the protection scope of this patent.

[0046] The present invention provides a specific implementation of a guardrail fixing assembly, such as Figure 1-2As shown, it includes: a fence fixing structure with the above characteristics, and the opening of the fence slot 31 is a first opening, an extension part 33 extending to both sides is fixed on the first opening, the extension direction is the second direction, and the direction in which the fence 10 is inserted into the fence slot 31 is the third direction; the main structure 20 includes a base 21, two side panels 22 and a cover plate 23, the two side panels 22 are located on both sides of the fixing frame 30, one end of the side panel 22 is abutted against the extension part 33 in the second direction, the other end of the side panel 22 is fixed to the base 21, the cover plate 23 is abutted against the extension part 33 in the third direction, and a second opening is opened on the cover plate 23, the position of the second opening is the same as the first opening, so that the fence 10 can be inserted into the fence slot 31 after passing through the second opening and the first opening in sequence. The extension part 33 can be set with a mounting position to hang a marble pendant, which plays a supporting role for the pendant, is convenient for users to use on site, and increases the function of the fence fixing structure. In actual production, the material and shape of the pendant can also be adopted in other forms, and the adjusted schemes are all within the protection scope of this patent.

[0047] In this specific embodiment, the base 21 is a concrete step, the side plate 22 is a tile material, and the device is suitable for fixing the handrail beside the stairs. The extension 33 can be directly used as the installation reference of the side plate 22. The fixing frame 30 is used to install the balustrade 10 and plays the role of supporting the side plate 22 and the cover plate 23, eliminating the original fixing structure of the tile at the edge of the step. Since the balustrade fixing structure itself is compact, the thickness of the step edge structure in the horizontal direction is reduced, and the appearance is more beautiful. When the balustrade 10 needs to be installed or removed, the cover plate 23 can be directly removed to operate the adjustment member 40, or a corresponding first through hole can be opened on the cover plate 23 in the extension direction of the second axis, and a second through hole can be opened on the extension 33. During operation, a screwdriver is inserted through the first through hole and the second through hole and the adjustment member 40 is rotated. In the extension direction of the second axis, corresponding notches can be set on the cover plate 23 and the extension 33. Under these schemes, the cover plate 23 can be fixed with the side plate 22 and the extension 33, and the installation and removal operations of the balustrade 10 are particularly simple.

[0048] In actual production, the base 21 can also be a structure such as a floor of a building, a cabin deck, etc., and the side panels 22 and the cover panels 23 can also be made of other materials such as stainless steel and marble. The functions of the side panels 22 and the cover panels 23 can be to protect the fixing frame 30 or to have an aesthetic effect, and these schemes are all within the scope of protection of this patent.

[0049] In this specific embodiment, the base 21 is parallel to the horizontal plane, and the second axis is arranged along the vertical direction, perpendicular to the horizontal plane and the base 21. When the user needs to disassemble the guardrail 10, he only needs to insert the screwdriver into the adjustment member 40 from one side of the guardrail 10 along the direction of the guardrail 10, and rotate the adjustment member 40 to complete the disassembly or fixation of the guardrail 10, and the adjustment operation is convenient. In actual production, the angle between the second axis and the plane where the base is located can be 60-90 degrees, which can be set according to the shape of the base and the surrounding environment to facilitate adjustment and save space, and the adjusted schemes are all within the protection scope of this patent.

[0050] The present invention provides a specific embodiment of a fence 10 assembly, such as Figure 1 and Figure 2 As shown, it includes a guardrail 10 and a guardrail fixing assembly having the above characteristics, and the guardrail 10 is fixed in a fixed position. The guardrail 10 can be pre-installed in the guardrail slot 31, or it can be installed at the construction site after the guardrail fixing structure is installed.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A guardrail fixing structure, used to fix the guardrail on a main structure, characterized in that: include: A fixing frame fixed on the main structure, the fixing frame is provided with a fence slot, a through screw hole is provided on a side wall of the fence slot, and the axis of the screw hole is a first axis; An adjusting member is rotatably connected to the fixing frame or the main structure, the rotation axis is the second axis, and the adjusting member is provided with an external thread; The clamping member comprises a fixed pressing part, a threaded part and a transmission part; the transmission part is provided with gear teeth in the circumferential direction of the first axis, the threaded part passes through the screw hole, the pressing part is located outside the clamping member, and forms a fixed position of the fence with the fence slot; wherein, The adjusting member drives the pressing member to rotate so as to fix the guardrail at the fixed position; The transmission part is a gear, and the adjusting member is a screw; One end of the fixing frame away from the fence slot has a fixing plate extending in the lateral direction of the fence slot, and a fixing structure is arranged on the fixing plate.

2. A guardrail fixing structure according to claim 1, characterized in that: The pressing part, the threaded part and the transmission part are arranged in sequence.

3. A guardrail fixing structure according to claim 1, characterized in that: The pressing part has a buffer pad for contacting with the guardrail.

4. A guardrail fixing structure according to claim 1, characterized in that: The extension direction of the fence slot is a first direction. Along the first direction, the height of the side wall of the fence slot gradually decreases. The adjusting member and the pressing member are arranged along the first direction.

5. A guardrail fixing assembly, used for fixing the guardrail, characterized in that: include: According to a fence fixing structure according to any one of claims 1 to 4, the fence slot has a first opening, the first opening has extensions extending to both sides respectively, the extension direction of the extension is a second direction, and the direction in which the fence is inserted into the fence slot is a third direction; and a main structure, including a base, two side panels and a cover plate; wherein, The fixing structure is fixed on the base, and the two side panels are respectively fixed to the base and are located on both sides of the fence slot. The end of the side panel away from the base abuts against the extension portion in a first direction; the cover plate abuts against the extension portion in the third direction and has a second opening, and the fence is inserted into the fence slot through the second opening.

6. A guardrail fixing assembly according to claim 5, characterized in that: include: The included angle between the second axis and the plane where the base is located is 60-90 degrees.

7. A guardrail fixing assembly according to claim 6, characterized in that: include: A first through hole is formed on the cover plate, and a second through hole is formed on the extended portion. The first through hole and the second through hole are located on the second axis.

8. A guardrail assembly, characterized in that: include guardrails; and, According to the guardrail fixing assembly described in any one of claims 5-7, the guardrail is fixed at the fixing position.

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