A crosswind warning device

By designing a cross-wind warning device including a bellows, air ducts and rotors, the problem that existing devices cannot inform cross-winds and wind magnitudes in real time is solved, real-time wind monitoring and warning are achieved, and driving safety is improved.

CN116479803BActive Publication Date: 2025-05-02BEIJING ZHONGKAI LUDA TRANSPORTATION TECH CO LTD
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Patent Information

Application Number
CN202310500632.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-06
Publication Date
2025-05-02
Estimated Expiration
2043-05-06

AI Technical Summary

Technical Problem

The existing cross-wind warning device cannot inform the driver and passengers in real time whether there is cross-wind and the magnitude of the wind, which makes it difficult for the driver to respond in a timely manner and increase the risk of traffic accidents.

Method used

A cross-wind warning device is designed, including a column standing upright on one side of the road, and the top is fixedly connected to the bellows and air guide ducts. A piston and a driving member are provided in the air guide ducts. The piston pushes the driving member to drive the rotor to rotate, so that the warning sign indicating the wind level is displayed in the direction of driving.

Benefits of technology

By displaying the warning signs of the wind level in real time, drivers and passengers can promptly determine whether there is cross wind and the magnitude of the wind, so as to make predictions in advance, control the vehicle's driving direction and speed, and ensure driving safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a crosswind warning device, comprising a column, a bellows, and an air duct which is closed at one end and open at the other end and communicates with the interior of the bellows, both ends of the bellows are provided with air inlets which can only be used for one-way conduction, and the interior of the air duct is provided with a piston which can move inward and outward along its inner wall; the top of the column is respectively fixedly connected with an upper and a lower crossbar, a rotating drum is rotatably installed between the free ends of the upper and lower crossbars, and the outer wall of the rotating drum is respectively provided with a plurality of warning signs for indicating different wind force levels, a rotating part for driving the rotating drum to rotate is installed on the upper crossbar, and a driving part for driving the rotating part to rotate is connected to the outer side of the piston. The invention can make the warning sign indicating the corresponding wind force level face the driving direction, and the driver and passengers can judge whether there is a crosswind and the current wind force by observing the current corresponding warning sign, so that they can make a prejudgment in advance and control the driving direction and speed of the vehicle in time, thereby ensuring driving safety.
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Description

Technical Field

[0001] The invention relates to the technical field of traffic safety products, in particular to a crosswind warning device. Background Art

[0002] On many roads, especially highways, in valleys, elevated roads and other sections, there are strong crosswinds, which pose a great safety hazard to vehicles, especially those with high bodies and high centers of gravity. If you do not pay attention to controlling the speed, there may be certain dangers, and if there are no reference objects on the road, it is often difficult for drivers to see whether there is a strong wind on the road. Therefore, on sections of roads prone to crosswinds, it is usually an effective early warning method to set up a warning device on one side of the road.

[0003] At present, a "Beware of Crosswind" sign is usually erected on one side of the road. It mainly includes a yellow triangular sign with a wind bag sign with a yellow background and black edges, and the words "Beware of Crosswind" are written below to warn passing vehicles to pay attention to crosswind. However, the sign cannot tell the driver and passengers in real time whether there is a crosswind, nor can it tell the driver and passengers the current wind force and the degree of danger. This requires relying on the actual experience of the driver, making preparations in advance, maintaining the original correct driving direction, and slowly stepping on the brakes to reduce the speed. Since the appearance of crosswinds is often sudden, generally with the characteristics of short time and strong wind, if the speed is too fast, the driver will not have time to react. In addition, improper operation by the driver, such as swerving the steering wheel or slamming on the brakes, will cause the vehicle to roll over and skid, causing traffic accidents. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects and shortcomings of the prior art and to provide a crosswind warning device that can make the warning sign (color sign) indicating the corresponding wind force level face the driving direction. The driver and passengers can judge whether there is a crosswind and the current wind force by observing the current corresponding warning sign (color sign), so as to make a prediction in advance and control the vehicle's driving direction and speed in time to ensure driving safety.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The top of the column is respectively fixedly connected to an upper cross bar and a lower cross bar, a rotating drum is rotatably installed between the free ends of the upper cross bar and the lower cross bar, and the outer wall of the rotating drum is respectively provided with a rotating component for driving the rotating drum to rotate clockwise and counterclockwise, a tension spring is connected between the inner side of the piston and the inner wall of the closed end of the air guide pipe, and a driving component for driving the rotating component to rotate clockwise and counterclockwise is connected to the outer side of the piston.

[0007] Furthermore, when there is crosswind entering the air duct through the air inlet at either end, the wind force pushes the piston to move laterally outward along the inner wall of the air duct, pushes the driving component to move laterally outward, drives the rotating component to rotate counterclockwise, and drives the rotating drum to rotate clockwise, so that a warning sign faces straight ahead; when there is no crosswind, the tension spring contracts and resets, pulling the piston to move laterally inward along the inner wall of the air duct, pushing the driving component to move laterally inward, driving the rotating component to rotate clockwise, and driving the rotating drum to rotate counterclockwise and reset.

[0008] Furthermore, sealing plates are rotatably installed on the top edges of the air inlets at both ends for closing the air inlets, and annular stop rings are fixedly connected to the edges of the air inlets at both ends for preventing the sealing plates from deflecting toward the outside of the bellows; when crosswind enters through the air inlet at either end, the corresponding sealing plates are pushed to deflect toward the inside of the bellows.

[0009] Furthermore, the rotating component includes a gear and a cam coaxially rotatably mounted on the upper cross bar.

[0010] Furthermore, the rotating drum includes a rectangular cylinder body and square cylinder covers fixedly connected to the upper and lower ends of the rectangular cylinder body, and a vertical axis passes through the square cylinder cover at the upper end, the rectangular cylinder body and the square cylinder cover at the lower end from top to bottom in sequence, and is fixedly connected to the square cylinder covers at the upper and lower ends. The top end of the vertical axis is fixedly sleeved with a fixing ring, and the outer periphery of the fixing ring is respectively provided with four tenons that are integrally connected and form an angle of 90° with each other, and the four tenons respectively correspond to the four side surfaces of the rectangular cylinder body one by one; the upper cross bar is rotatably installed with a swing arm between the gear and the fixing ring, and the two ends of the swing arm are respectively in contact with the protrusion of the cam and one of the four tenons, and the upper end of the vertical axis is installed with a torsion spring for limiting the counterclockwise rotation of the rotating drum.

[0011] Furthermore, the driving component includes a transverse rack and a transverse rod, one end of the transverse rack is fixedly connected to the outer side of the piston, and one end of the transverse rod is rotatably connected to the outer side of the piston and can be deflected laterally. The other ends of the transverse rack and the transverse rod extend from the open end of the air duct, the other end of the transverse rack is meshed with the gear, and the other end of the transverse rod is abutted against the outer periphery of the fixing ring.

[0012] Furthermore, an elastic member is fixedly connected to the inner wall of the open end of the air guide pipe, and the elastic member abuts against one side of the cross bar.

[0013] Furthermore, the plurality of warning signs are blue, yellow, orange and red signs respectively painted on the four outer surfaces of the rectangular body, and are distributed in sequence in a counterclockwise direction from the front side of the rectangular body.

[0014] Furthermore, the rectangular body and the vertical axis are both hollow structures.

[0015] Furthermore, a "cross wind warning" sign is fixedly connected between the upper cross bar and the lower cross bar on the inner side of the rotating drum.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention is arranged on one side of the road. When crosswind enters the air duct through the air inlet at either end, the wind force pushes the piston to move laterally outward along the inner wall of the air duct, pushes the driving component to move laterally outward, drives the rotating component to rotate counterclockwise, and drives the rotating drum to rotate clockwise, so that a warning mark (color mark) faces straight ahead, that is, the warning mark (color mark) indicating the corresponding wind force level faces the driving direction. Drivers and passengers can judge whether there is a crosswind and the current wind force by observing the current corresponding warning mark (color mark), so that they can make a prediction in advance and control the driving direction and speed of the vehicle in time, thereby ensuring driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part A.

[0020] Figure 3 It is a schematic diagram of the internal structure of the air box and the air guide pipe in the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the piston, driving component, rotating component and rotating drum in the present invention.

[0022] Figure 5 It is a schematic diagram of the working state of the present invention when there is cross wind.

[0023] Figure 6 It is a schematic diagram of the working state of the present invention when there is no crosswind. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-6 , a crosswind warning device comprises a column 1 erected on one side of the road, a bellows 2 is fixedly connected to the top of the column 1, an air duct 3 with one end closed and the other end open is connected to the bottom of the bellows 2, the closed end of the air duct 3 is communicated with the interior of the bellows 2, both ends of the bellows 2 are provided with air inlets 4 that can only be used for one-way conduction, and a piston 5 that can move inward and outward along its inner wall is provided inside the air duct 3; an upper cross bar 6 and a lower cross bar 7 are fixedly connected to the top of the column 1, a rotating drum 8 is rotatably installed between the free ends of the upper cross bar 6 and the lower cross bar 7, and four warning signs 9 for indicating different wind force levels are respectively provided on the outer wall of the rotating drum 8, a rotating part 10 for driving the rotating drum 8 to rotate clockwise and counterclockwise is installed on the upper cross bar 6, a tension spring 11 is connected between the inner side of the piston 5 and the inner wall of the closed end of the air duct 3, and a driving part 12 for driving the rotating part 10 to rotate clockwise and counterclockwise is connected to the outer side of the piston 5.

[0026] Therefore, when crosswind enters the air duct 3 through the air inlet 4 at either end, the wind force pushes the piston 5 to move laterally outward along the inner wall of the air duct 3, pushes the driving component 12 to move laterally outward, drives the rotating component 10 to rotate counterclockwise, and drives the rotating drum 8 to rotate clockwise, so that a warning sign faces straight ahead, that is, the warning sign indicating the corresponding wind force level faces the driving direction, so that the driver and passengers can observe the current situation in time. At this time, the tension spring 11 is stretched.

[0027] When the crosswind disappears, the tension spring 11 contracts and resets, pulling the piston 5 to move inward along the inner wall of the air duct 3 and reset, thereby pulling the driving component 12 to move inward and reset, driving the rotating component 10 to rotate clockwise, driving the rotating drum 8 to rotate counterclockwise and reset.

[0028] In the present invention, sealing plates 13 are rotatably installed on the top edges of the air inlets 4 at both ends for closing the air inlets there. Annular stop rings 14 are fixedly connected to the edges of the air inlets 4 at both ends for preventing the sealing plates 13 from deflecting to the outside of the bellows 2.

[0029] Therefore, when cross wind enters through the air inlet 4 at either end, the corresponding sealing plate 13 is pushed to deflect toward the inside of the wind box 2 .

[0030] Specifically, when a crosswind enters from the air inlet 4 at the left end, the sealing plate 13 at the left end is pushed to deflect toward the inside of the bellows 2. Under the blocking effect of the sealing plate 13 at the right end, the sealing plate 13 at the right end will not deflect toward the outside of the bellows 2; similarly, when a crosswind enters from the air inlet 4 at the right end, the sealing plate 13 at the right end is pushed to deflect toward the inside of the bellows 2. Under the blocking effect of the sealing plate 13 at the left end, the sealing plate 13 at the left end will not deflect toward the outside of the bellows 2, thereby achieving one-way conduction at the air inlets 4 at both ends.

[0031] When the crosswind disappears, the sealing plate 13 naturally hangs down under the action of gravity to close the air inlet.

[0032] In the present invention, the rotating component 10 includes a gear 101 and a cam 102 which are coaxially rotatably mounted on the upper crossbar 6 .

[0033] In the present invention, the rotating drum 8 includes a rectangular cylinder body 81 and a square cylinder cover 82 fixedly connected to the upper and lower ends of the rectangular cylinder body 81. A vertical shaft 83 passes through the upper square cylinder cover 82, the rectangular cylinder body 81 and the lower square cylinder cover 82 from top to bottom, and is fixedly connected to the upper and lower square cylinder covers 82. The top of the vertical shaft 83 is fixedly sleeved with a fixing ring 15, and the outer periphery of the fixing ring 15 is respectively provided with four tenons 16 which are integrally connected and mutually angled at 90 degrees. The four tenons 16 correspond to the four side surfaces of the rectangular barrel 81 respectively; the upper cross bar 6 is rotatably installed with a swing arm 17 between the gear 101 and the fixed ring 15, and the two ends of the swing arm 17 are respectively in contact with the protrusion of the cam 102 and one of the four tenons 16. The upper end of the vertical shaft 83 is installed with a torsion spring 18 for limiting the counterclockwise rotation of the rotating drum 8, that is, the torsion spring 18 can provide power for the clockwise rotation of the rotating drum 8 by storing torsional energy (elastic potential energy).

[0034] In the present invention, the driving component 12 includes a transverse rack 121 and a cross bar 122. One end of the transverse rack 121 is fixedly connected to the outer side of the piston 5, and one end of the cross bar 122 is rotatably connected to the outer side of the piston 5 and can be laterally deflected. The other ends of the transverse rack 121 and the cross bar 122 extend from the open end of the air duct 3. The other end of the transverse rack 121 is meshed with the gear 101, and the other end of the cross bar 122 is abutted against the outer periphery of the fixing ring 15.

[0035] In the present invention, an elastic member 19 is fixedly connected to the inner wall of the open end of the air duct 3 , and the elastic member 19 abuts against one side of the cross bar 122 , and can apply a top pressure to the cross bar 122 , so that the other end of the cross bar 122 can be tightly attached to the outer periphery of the fixing ring 15 .

[0036] Therefore, when there is crosswind entering the air duct 3 through the bellows 2, the piston 5 moves outward along the inner wall of the air duct 3 under the push of the wind force, pushing the transverse rack 121 and the cross bar 122 to move outward. Since the transverse rack 121 is meshed with the gear 101, the gear 101 rotates counterclockwise, and then the cam 102 rotates counterclockwise. After the cam 102 rotates counterclockwise for one circle, it will move the swing arm 17 once, causing it to swing clockwise once, disengaging from the tenon originally abutting against it, that is, releasing the tenon originally abutting against it. At this time, the torsion spring 18 that originally stored torsional energy (elastic potential energy) will produce reverse torsional energy release, driving the rotating drum 8 to rotate 90° clockwise, so that the swing arm 17 abuts against an adjacent tenon again. At this time, an adjacent warning sign faces straight ahead, that is, the warning sign indicating the corresponding wind force level faces the driving direction, so that the driver and passengers can observe the current situation in time. At this time, the tension spring 11 is stretched.

[0037] During this process, the cross bar 122 is always in close contact with the outer circumference of the fixing ring 15 under the pressing action of the elastic member 19 .

[0038] When the crosswind disappears, the tension spring 11 contracts and resets, pulling the piston 5 to move inward along the inner wall of the air duct 3 and reset, and then pulling the transverse rack 121 and the cross bar 122 to move inward and reset. Since the cross bar 122 is always in close contact with the outer periphery of the fixed ring 15, during the process of the cross bar 122 moving inward and resetting, the friction force generated by the contact between the cross bar 122 and the fixed ring 15 drives the rotating drum 8 to rotate counterclockwise and reset. At this time, the torsion spring 18 twists and stores energy (elastic potential energy) again, providing power for the rotating drum 8 to rotate clockwise again.

[0039] In the present invention, the four warning signs 9 are blue, yellow, orange and red signs painted on the four outer sides of the rectangular body 81 respectively, and are distributed in sequence in a counterclockwise direction from the front side of the rectangular body 91, that is, the side facing the driving direction.

[0040] Therefore, by painting the four-color logos of blue, yellow, orange and red, it represents the wind force from none to present, from weak to strong, among which the blue logo indicates no crosswind, and the yellow, orange and red logo indicates the presence of crosswind, and they represent the wind force from weak to strong, respectively.

[0041] In addition, the four-color logo of blue, yellow, orange and red is the same as the color distinction method commonly used in the international early warning system, which is easy for people to perceive and understand.

[0042] In the present invention, the rectangular cylinder body 81 and the vertical axis 83 are both hollow structures, which can reduce their own weight as much as possible, so that when there is a crosswind, the rotating drum 8 rotates clockwise under the push of wind, or when there is no crosswind, the rotating drum 8 rotates counterclockwise and resets.

[0043] In the present invention, a "cross wind warning" sign 20 is fixedly connected between the upper cross bar 6 and the lower cross bar 7 on the inner side of the rotating drum to remind the driver and passengers to pay attention.

[0044] The present invention will be further described below with reference to the accompanying drawings:

[0045] The crosswind warning device of the present invention is erected on one side of the road through a column 1.

[0046] When in use, in the initial state, that is, when there is no crosswind, the tension spring 11 is in a naturally stretched state. At this time, the piston 5 is located near the closed end of the air duct 3, the blue mark on the rotating drum 8 faces the driving direction, and the torsion spring 18 twists and stores energy (elastic potential energy).

[0047] When there is a crosswind, the crosswind enters the air duct 3 through the air inlet 4 at either end. Driven by the wind, the piston 5 moves laterally outward along the inner wall of the air duct 3, pushing the transverse rack 121 and the cross bar 122 to move laterally outward. Since the transverse rack 121 is meshed with the gear 101, the gear 101 rotates counterclockwise, and then the cam 102 rotates counterclockwise. After the cam 102 rotates counterclockwise for one circle, it will move the swing arm 17 once, causing it to swing clockwise once, disengaging from the tenon that was originally abutted against it, that is, releasing the tenon that was originally abutted against it. At this time, the torsion spring 18 that originally stored torsional energy (elastic potential energy) will produce reverse torsional energy release, driving the rotating drum 8 to rotate 90° clockwise, so that the swing arm 17 is again abutted against an adjacent tenon. At this time, an adjacent warning sign (color sign) is facing straight ahead, that is, the warning sign (color sign) indicating the corresponding wind force level is facing the driving direction, so that the driver and passengers can observe the current situation in time. At this time, the tension spring 11 is stretched.

[0048] During this process, the cross bar 122 is always in close contact with the outer circumference of the fixing ring 15 under the pressing action of the elastic member 19 .

[0049] It should be noted that when crosswinds of different wind force levels enter the air duct 3 through the bellows 2, the pressure acting on the inner side of the piston 5 is also different, causing the clockwise rotation angle of the rotating drum 8 to be different. It may be 90° clockwise, 180° clockwise, or 270° clockwise, so that the warning signs (color signs) indicating different wind force levels face the driving direction.

[0050] At this time, the driver and passengers can judge whether there is a crosswind and the current wind force by observing the corresponding warning signs (color signs), so that they can make predictions in advance, allowing the driver to control the vehicle's direction and speed in time to ensure driving safety.

[0051] When the crosswind disappears, the tension spring 11 contracts and resets, pulling the piston 5 to move inward along the inner wall of the air duct 3 and reset, and then pulling the transverse rack 121 and the cross bar 122 to move inward and reset. Since the cross bar 122 is always in close contact with the outer periphery of the fixed ring 15, during the process of the cross bar 122 moving inward and resetting, the friction force generated by the contact between the cross bar 122 and the fixed ring 15 drives the rotating drum 8 to rotate counterclockwise and reset. At this time, the torsion spring 18 twists and stores energy (elastic potential energy) again, providing power for the rotating drum 8 to rotate clockwise again.

[0052] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0053] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A crosswind warning device, comprising a column erected on one side of a road, characterized in that: The top of the column is fixedly connected to a bellows, and the bottom of the bellows is connected to an air duct with one end closed and the other end open, the closed end of the air duct is communicated with the interior of the bellows, both ends of the bellows are provided with air inlets that can only be used for one-way conduction, and the interior of the air duct is provided with a piston that can move inward and outward along its inner wall; the top of the column is respectively fixedly connected to an upper cross bar and a lower cross bar, a rotating drum is rotatably installed between the free ends of the upper and lower cross bars, and a number of warning signs for indicating different wind force levels are respectively provided on the outer wall of the rotating drum, a rotating component for driving the rotating drum to rotate clockwise and counterclockwise is installed on the upper cross bar, a tension spring is connected between the inner side of the piston and the inner wall of the closed end of the air duct, and a driving component for driving the rotating component to rotate clockwise and counterclockwise is connected to the outer side of the piston.

2. A crosswind warning device according to claim 1, characterized in that: When there is crosswind entering the air duct through the air inlet at either end, the wind force pushes the piston to move laterally outward along the inner wall of the air duct, pushes the driving component to move laterally outward, drives the rotating component to rotate counterclockwise, and drives the rotating drum to rotate clockwise, so that a warning sign faces straight ahead; when there is no crosswind, the tension spring contracts and resets, pulling the piston to move laterally inward along the inner wall of the air duct, pushing the driving component to move laterally inward, driving the rotating component to rotate clockwise, and driving the rotating drum to rotate counterclockwise and reset.

3. A crosswind warning device according to claim 1, characterized in that: The top edges of the air inlets at both ends are rotatably mounted with sealing plates for closing the air inlets. Annular stop rings are fixedly connected to the edges of the air inlets at both ends for preventing the sealing plates from deflecting toward the outside of the bellows. When crosswind enters through the air inlet at either end, the corresponding sealing plate is pushed to deflect toward the inside of the bellows.

4. A crosswind warning device according to claim 1, characterized in that: The rotating component comprises a gear and a cam which are coaxially rotatably mounted on the upper cross bar.

5. A crosswind warning device according to claim 4, characterized in that: The rotating drum comprises a rectangular cylinder body and a square cylinder cover fixedly connected to the upper and lower ends of the rectangular cylinder body, a vertical axis passes through the square cylinder cover at the upper end, the rectangular cylinder body and the square cylinder cover at the lower end from top to bottom in sequence, and is fixedly connected to the square cylinder cover at the upper and lower ends, a fixing ring is fixedly sleeved on the top end of the vertical axis, and four tenons which are integrally connected and form an angle of 90° with each other are respectively arranged on the outer periphery of the fixing ring, and the four tenons respectively correspond to the four side surfaces of the rectangular cylinder body one by one; a swing arm is rotatably installed on the upper cross bar between the gear and the fixing ring, and the two ends of the swing arm are respectively in contact with the protruding portion of the cam and one of the four tenons, and a torsion spring for limiting the counterclockwise rotation of the rotating drum is installed on the upper end of the vertical axis.

6. A crosswind warning device according to claim 5, characterized in that: The driving component includes a transverse rack and a transverse rod, one end of the transverse rack is fixedly connected to the outer side of the piston, and one end of the transverse rod is rotatably connected to the outer side of the piston and can be deflected laterally. The other ends of the transverse rack and the transverse rod extend from the open end of the air duct, the other end of the transverse rack is meshed with the gear, and the other end of the transverse rod abuts against the outer periphery of the fixed ring.

7. A crosswind warning device according to claim 6, characterized in that: An elastic member is fixedly connected to the inner wall of the open end of the air guide pipe, and the elastic member abuts against one side of the cross bar.

8. A crosswind warning device according to claim 5, characterized in that: The several warning signs are blue, yellow, orange and red signs painted on the four outer sides of the rectangular cylinder body respectively, and are distributed in sequence in a counterclockwise direction from the front side of the rectangular cylinder body.

9. A crosswind warning device according to claim 5, characterized in that: The rectangular parallelepiped body and the vertical axis are both hollow structures.

10. A crosswind warning device according to claim 1, characterized in that: A "cross wind warning" sign is fixedly connected between the upper cross bar and the lower cross bar on the inner side of the rotating drum.

Citation Information

Patent Citations

  • Telescopic crosswind-preventing device

    CN107905129A

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