A warning sign for municipal construction

By using a support column and support weight structure, combined with omnidirectional wheels and counterweight design, the problem of warning signs for municipal construction being tilted in strong winds has been solved, achieving stability and easy movement of the warning signs and reducing safety hazards.

CN117188359BActive Publication Date: 2025-12-09NINGBO HUAYU CONSTR CO LTD
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Patent Information

Application Number
CN202311399659.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-25
Publication Date
2025-12-09
Estimated Expiration
2043-10-25

AI Technical Summary

Technical Problem

Warning signs used for municipal construction are prone to tipping over in windy weather, posing safety hazards and failing to provide effective warnings.

Method used

The warning sign adopts a support column and support weight structure. The support weight lowers the center of gravity of the warning sign. Combined with the design of casters, springs and counterweights, the warning sign is stable and easy to move.

Benefits of technology

It effectively reduces the probability of warning signs tipping over, improves the stability and handling efficiency of warning signs, and ensures safety and ease of operation in windy weather.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the field of municipal infrastructure, in particular to a warning sign for municipal construction, which comprises a sign body, a supporting column and a supporting weight, one end of the supporting column is fixedly connected to the sign body, and the other end of the supporting column is fixedly connected to the upper end of the supporting weight. The supporting column supports the sign body, the supporting weight lowers the overall gravity center of the warning sign, and the probability of the warning sign toppling is reduced.
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Description

TECHNICAL FIELD

[0001] The present application relates to the field of municipal infrastructure, in particular to a warning sign for municipal construction. BACKGROUND

[0002] The warning sign for municipal construction is a tool for transmitting warning information to passing pedestrians and vehicles during municipal construction.

[0003] When the warning sign is used in an outdoor environment, it is prone to fall over in strong winds, which can pose a threat to the safety of passing pedestrians. The fallen warning sign is not easy to play a warning role, and is prone to cause safety accidents. SUMMARY

[0004] In order to reduce the probability of the warning sign falling over, the present application provides a warning sign for municipal construction.

[0005] The warning sign for municipal construction provided by the present application adopts the following technical solution:

[0006] The warning sign for municipal construction comprises a sign body, a support column and a support weight, one end of the support column is fixedly connected to the sign body, and the other end of the support column is fixedly connected to the upper end of the support weight.

[0007] By adopting the above technical solution, the support column supports the sign body, and the support weight lowers the overall center of gravity of the warning sign, thereby reducing the probability of the warning sign falling over.

[0008] Preferably, the warning sign for municipal construction further comprises a mounting plate and a universal wheel, the universal wheel is fixedly connected to the lower end of the mounting plate, the lower end of the support weight is provided with a mounting groove, the mounting plate is slidingly connected to the groove wall of the mounting groove, and the mounting plate slides up and down in the mounting groove.

[0009] By adopting the above technical solution, the support weight makes the overall weight of the warning sign heavier, and the mounting plate slides up and down in the mounting groove, which makes the universal wheel slide synchronously. When the warning sign needs to be moved, the universal wheel slides downward to extend out of the mounting groove, and when the warning sign needs to be fixed, the universal wheel slides upward to extend into the mounting groove, which is simple to operate and improves the carrying efficiency.

[0010] Preferably, the warning board for municipal construction further comprises a first spring, a sliding plate, a pedal and a sliding column, one end of the first spring is fixedly connected to the upper end of the mounting plate, the other end of the first spring is fixedly connected to the sliding plate, the sliding plate is slidingly connected to the groove wall of the mounting groove, the outer wall of the supporting weight is provided with a communication groove, the communication groove is communicated with the mounting groove, the pedal is fixedly connected to one end of the sliding plate facing the communication groove, the pedal extends out of the communication groove, the groove wall of the mounting groove is provided with a sliding groove, the sliding column is slidingly connected to the groove wall of the sliding groove, and the lower end of the sliding column is used for abutting against the upper end of the sliding plate.

[0011] By adopting the above technical scheme, the pedal is stepped down to make the sliding plate slide downward synchronously, the first spring is compressed, when the sliding plate moves to the lower side of the sliding groove, the sliding column slides out of the sliding groove to hinder the upward sliding of the sliding plate, the person who exerts force leaves the pedal, the first spring has a tendency to restore deformation, the sliding plate slides upward relative to the universal wheel to make the supporting weight move upward synchronously to leave the ground, the operation is simple, and the carrying efficiency of the warning board is improved.

[0012] Preferably, the warning board for municipal construction further comprises a second spring, one end of the second spring is fixedly connected to the groove bottom of the sliding groove, the other end of the second spring is fixedly connected to one end of the sliding column facing the groove bottom of the sliding groove, one end of the sliding column facing the groove bottom of the mounting groove is provided with a guide surface, and the guide surface is used for abutting against the lower end of the sliding plate.

[0013] By adopting the above technical scheme, the sliding plate slides downward to abut against the guide surface, the second spring is contracted, the sliding column slides away from the mounting groove, the sliding groove guides the sliding of the sliding column, when the sliding plate continues to slide downward to be far away from the sliding column, the second spring restores deformation to make the sliding column slide out of the sliding groove to hinder the upward sliding of the sliding plate, the operation is simple, and the pedal only needs to be stepped down to make the universal wheel extend out of the mounting groove and be fixed, thereby improving the carrying efficiency of the warning board.

[0014] Preferably, the warning board for municipal construction further comprises a gear, a first rack, a second rack and a pressing plate, the outer wall of the supporting weight is provided with a connecting groove, the supporting weight is provided with a mounting cavity, the mounting cavity is communicated with the sliding groove and the connecting groove, the gear is rotationally connected to the inner wall of the mounting cavity around its own axis, the rotation axis of the gear is perpendicular to the sliding direction of the sliding column, the first rack is fixedly connected to one end of the sliding column facing the gear, the first rack is engaged with the upper end of the gear, the second rack is engaged with one end of the gear away from the mounting groove, one end of the pressing plate is fixedly connected to one end of the second rack facing the connecting groove, and the other end of the pressing plate extends out of the connecting groove.

[0015] By adopting the above technical scheme, the warning board is moved to the correct position, and when the warning board needs to be fixed, the pressing plate is pressed down, the pressing plate drives the second rack to slide downward synchronously, the first rack moves away from the mounting groove, the first rack drives the sliding column to move synchronously, the second spring contracts, and after the sliding column returns to the sliding groove, the sliding plate cannot slide upward, the sliding plate drives the universal wheel to slide upward synchronously, the operation is simple, the supporting weight contacts the ground, the stability of the warning board is improved, and the probability of the warning board falling is reduced.

[0016] Preferably, the warning board for municipal construction further comprises a balance weight and a rope, the lower end of the supporting weight is provided with a placing groove, the placing groove is provided with two, the two placing grooves are arranged on the two sides of the board body, the two placing grooves are arranged on the two sides of the mounting groove, the balance weight is provided with two, the balance weight is slid in the placing groove one by one, the supporting weight is provided with a communication port, the two ends of the communication port are communicated with the two placing grooves respectively, the rope passes through the communication port, and the two ends of the rope are fixedly connected with the two balance weights respectively.

[0017] By adopting the above technical scheme, when the wind makes the warning board have a tendency to fall, and the windward area of the board body is large, the warning board is prone to fall to the two sides of the board body, when the supporting weight has a tendency to fall, one end of the supporting weight is lifted, the balance weight is left on the ground, when the supporting weight is lifted to a certain height, the rope is taut, the balance weight pulls down the one end of the supporting weight that is lifted, the balance of the supporting weight is maintained, and the probability of the warning board falling is reduced.

[0018] Preferably, the warning board for municipal construction further comprises a stop block, the groove wall of the mounting groove is provided with a sliding groove, the sliding groove is arranged below the sliding groove, the sliding groove is communicated with the placing groove, one end of the balance weight towards the sliding groove is provided with an embedding groove, the stop block is slidably connected with the groove wall of the sliding groove, one end of the stop block is used for abutting against the sliding plate, and the other end of the stop block is used for embedding in the embedding groove.

[0019] By adopting the above technical scheme, when the sliding plate slides downward to below the sliding groove, the sliding column hinders the upward sliding of the sliding plate, one end of the stop block abuts against the outer wall of the sliding plate, the other end of the stop block extends into the embedding groove, the stop block relatively fixes the supporting weight and the balance weight, the universal wheel moves, the balance weight does not easily interfere with the sliding of the warning board.

[0020] Preferably, the warning board for municipal construction further comprises a pushing plate and a third spring, the groove wall of the sliding groove is provided with a reset groove, one end of the stop block towards the reset groove is connected with the pushing plate, one end of the third spring is fixedly connected with the groove wall of the reset groove, the other end of the third spring is fixedly connected with the pushing plate, and the two ends of the stop block are both provided with a round corner.

[0021] By adopting the technical scheme, the sliding plate slides downward to push the stopper to move away from the mounting groove, the third spring is contracted, when the sliding plate leaves the stopper, the third spring restores the deformation, the sliding plate slides to reset the stopper, the stopper is away from the embedding groove, the counterweight can be separated from the supporting weight, the balance warning board is facilitated, and the probability of the warning board toppling is reduced.

[0022] In summary, the present application has at least one of the following beneficial technical effects:

[0023] 1. The support column supports the board body, the supporting weight makes the overall gravity center of the warning board move downward, and the probability of the warning board toppling is reduced.

[0024] 2. The foot steps on the pressing pedal to make the sliding plate slide downward synchronously, the first spring is compressed, when the sliding plate moves to the lower side of the sliding groove, the sliding column slides out of the sliding groove to hinder the upward sliding of the sliding plate, the person leaving the pedal has a tendency to restore the deformation, the sliding plate slides upward relative to the universal wheel to make the supporting weight move upward synchronously and leave the ground, the operation is simple and convenient, and the carrying efficiency of the warning board is improved.

[0025] 3. When the wind makes the warning board have a toppling tendency, and the windward area of the board body is large, the warning board is prone to toppling to the two sides of the board body, when the supporting weight has a toppling tendency, one end of the supporting weight is lifted, the counterweight remains on the ground, when the supporting weight is lifted to a certain height, the rope is taut, the counterweight pulls down the one end of the supporting weight that is lifted, the balance of the supporting weight is maintained, and the probability of the warning board toppling is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a whole structure schematic view of the warning board for municipal construction.

[0027] Figure 2 It is a whole structure schematic view of the moving assembly and the balance assembly.

[0028] Figure 3 It is a whole structure schematic view of the supporting weight and the moving assembly.

[0029] Figure 4 It is a sectional view of the supporting weight, the moving assembly and the balance assembly.

[0030] Figure 5 It is a sectional view of the supporting weight, the moving assembly and the balance assembly, mainly used for showing the sliding column, the second spring, the stopper and the third spring.

[0031] Figure 6 It is a schematic view of the internal structure of the supporting weight and the moving assembly after being cut open.

[0032] Explanation of reference signs: 1, plaque body; 2, support column; 3, support weight; 31, mounting groove; 32, communication groove; 33, sliding groove; 34, connecting groove; 35, mounting cavity; 36, placing groove; 37, communication port; 38, sliding groove; 39, reset groove; 4, moving assembly; 41, mounting plate; 42, universal wheel; 43, first spring; 44, sliding plate; 45, pedal; 46, sliding column; 461, guide surface; 47, second spring; 481, gear; 482, first rack; 483, second rack; 491, pressing plate; 492, control plate; 5, balancing assembly; 51, counterweight; 511, embedding groove; 52, rope; 53, stop block; 531, pushing plate; 54, third spring. DETAILED DESCRIPTION

[0033] The following will be described in detail below with reference to the accompanying drawings. Figures 1-6 The present application is further described in detail.

[0034] The embodiments of the present application disclose a warning sign for municipal construction. Referring to Figure 1 A warning sign for municipal construction includes a plaque body 1, a support column 2, a support weight 3, and a moving assembly 4.

[0035] The upper end of the support column 2 is fixedly connected to the lower end of the plaque body 1, and the lower end of the support column 2 is fixedly connected to the upper end of the support weight 3. The support weight 3 is in the shape of a cuboid. The upper end face of the support weight 3 is provided with two symmetrical axes, which are a first symmetrical axis and a second symmetrical axis, respectively. The first symmetrical axis is parallel to the width direction of the support weight 3, and the second symmetrical axis is parallel to the length direction of the support weight 3. The length direction of the plaque body 1 is parallel to the length direction of the support weight 3. The two end faces of the plaque body 1 are in the shape of a circular arc surface to reduce wind resistance. The support column 2 is in the shape of a cylinder to reduce wind resistance. There are two support columns 2, which are arranged at intervals along the length direction of the plaque body 1. The center line of the two support columns 2 is collinear with the second symmetrical axis.

[0036] Referring to Figure 2 The moving assembly 4 includes a mounting plate 41, a universal wheel 42, a first spring 43, a sliding plate 44, a pedal 45, a sliding column 46, a second spring 47, a gear 481, a first rack 482, a second rack 483, a pressing plate 491, and a control plate 492.

[0037] Referring to Figure 3 and Figure 4The lower end of the supporting weight 3 is provided with two mounting grooves 31, the two mounting grooves 31 are symmetrically arranged about the first axis of symmetry, the mounting plate 41 is slidingly connected to the groove wall of the mounting groove 31, the sliding direction of the mounting plate 41 is vertical, the universal wheel 42 is fixedly connected to the lower end of the mounting plate 41, the lower end of the first spring 43 is fixedly connected to the upper end of the mounting plate 41, the upper end of the first spring 43 is fixedly connected to the lower end of the sliding plate 44, and the sliding plate 44 is slidingly connected to the groove wall of the mounting groove 31.

[0038] Both ends of the supporting weight 3 are provided with communication grooves 32, the communication grooves 32 are communicated with the mounting grooves 31 one by one, one end of the pedal 45 is fixedly connected to the end of the sliding plate 44 facing the communication groove 32, and the other end of the pedal 45 extends out of the communication groove 32 for being stepped on by an operator.

[0039] Referring to Figure 5 The groove wall of the mounting groove 31 is provided with a sliding groove 33, the length direction of the sliding groove 33 is parallel to the width direction of the supporting weight 3, the sliding groove 33 is provided with two sliding grooves 33, the two sliding grooves 33 are oppositely arranged, the sliding column 46 is slidingly connected to the groove wall of the sliding groove 33, one end of the second spring 47 is fixedly connected to the groove bottom of the sliding groove 33, the other end of the second spring 47 is fixedly connected to the end of the sliding column 46 facing the groove bottom of the sliding groove 33, the end of the sliding column 46 facing the groove bottom of the mounting groove 31 is provided with a guide surface 461, the guide surface 461 is used for abutting against the lower end of the sliding plate 44, and the lower end of the sliding column 46 is used for abutting against the upper end of the sliding plate 44.

[0040] Referring to Figure 5 and Figure 6 Both ends of the supporting weight 3 are provided with two connecting grooves 34, the two connecting grooves 34 are arranged on the two sides of the communication groove 32, the supporting weight 3 is provided with a mounting cavity 35, the mounting cavity 35 is arranged below the sliding groove 33, the mounting cavity 35 is communicated with the sliding groove 33 and the connecting groove 34, the gear 481 is rotationally connected to the inner wall of the mounting cavity 35 about its own axis, and the rotation axis of the gear 481 is parallel to the length direction of the supporting weight 3.

[0041] Referring to Figure 2 and Figure 6 The first rack 482 is fixedly connected to the lower end of the sliding column 46, the first rack 482 is engaged with the upper end of the gear 481, the second rack 483 is arranged on the side of the gear 481 away from the communication groove 32, one end of the second rack 483 is engaged with the gear 481, the other end of the second rack 483 is slidingly connected to the inner wall of the mounting cavity 35, one end of the pressing plate 491 is fixedly connected to the end of the second rack 483 facing the connecting groove 34, the other end of the pressing plate 491 extends out of the connecting groove 34 and is fixedly connected to the control plate 492, the pressing plate 491 is slidingly connected to the groove wall of the connecting groove 34, the control plate 492 is arranged below the pedal 45, and the two ends of the control plate 492 are respectively fixedly connected to the two pressing plates 491.

[0042] Referring to Figure 2 The warning sign for municipal construction further comprises a balancing assembly 5, which comprises a balancing weight 51, a rope 52, a stopper 53 and a third spring 54.

[0043] The lower end of the support weight 3 is provided with two placing grooves 36, which are symmetrically arranged about the first axis of symmetry and are arranged on both sides of the mounting groove 31. The balancing weight 51 slides up and down in the placing groove 36. The length of the balancing weight 51 is greater than the distance between the two mounting grooves 31. The width of the balancing weight 51 is less than the width of the placing groove 36. The length of the balancing weight 51 is equal to the length of the placing groove 36.

[0044] Referring to Figure 4 and Figure 5 The support weight 3 is provided with a communication port 37, which is communicated with the two placing grooves 36 at both ends, respectively. The length direction of the communication port 37 is parallel to the width direction of the support weight 3. The rope 52 passes through the communication port 37. The two ends of the rope 52 are fixedly connected to the two balancing weights 51, respectively. The length of the rope 52 is greater than the length of the communication port 37. The upper end surface of the balancing weight 51 is provided as a circular arc surface.

[0045] Referring to Figure 5 The groove wall of the mounting groove 31 is provided with a sliding groove 38, which is arranged below the sliding groove 33. The length direction of the sliding groove 38 is parallel to the width direction of the support weight 3. The sliding groove 38 is communicated with the placing groove 36. The one end of the balancing weight 51 towards the sliding groove 38 is provided with an embedding groove 511. The stopper 53 is slidingly connected to the groove wall of the sliding groove 38. The two ends of the stopper 53 are both provided with chamfers. The one end of the stopper 53 is used for abutting against the sliding plate 44. The other end of the stopper 53 is used for embedding in the embedding groove 511. The groove wall of the sliding groove 38 is provided with a reset groove 39. The one end of the stopper 53 towards the reset groove 39 is connected with a pushing plate 531. One end of the third spring 54 is fixedly connected to the groove wall of the reset groove 39 towards the mounting groove 31. The other end of the third spring 54 is fixedly connected to the pushing plate 531.

[0046] The implementation principle of the warning sign for municipal construction is as follows: when the warning sign needs to be moved, the pedal 45 is stepped on to make the sliding plate 44 move synchronously, the first spring 43 is contracted, the sliding column 46 is avoided, the second spring 47 is contracted, when the sliding plate 44 slides to the lower side of the sliding column 46, the first spring 43 restores the deformation, the sliding column 46 pops out to block the sliding of the sliding plate 44, the stop block 53 slides into the embedding groove 511, the third spring 54 is contracted, the pedal 45 is removed, the first spring 43 is stretched to lift the supporting weight 3 through the sliding plate 44, the counterweight 51 is fixed in the placing groove 36 due to the limiting of the stop block 53, the warning sign is pushed, the universal wheel 42 rotates, and the warning sign is moved to the correct position; when the warning sign needs to be fixed, the control plate 492 is stepped on, the second rack 483 slides downward, the gear 481 rotates, the first rack 482 drives the sliding column 46 to slide, the first spring 43 is contracted, the supporting weight 3 is relatively slid downward with the sliding plate 44 due to gravity, the universal wheel 42 returns to the placing groove 36, the third spring 54 is reset to make the stop block 53 disengage from the embedding groove 511, and the counterweight 51 can slide in the placing groove 36; when the supporting weight 3 is about to fall, the rope 52 is taut, the counterweight 51 pulls down the end of the supporting weight 3 that is lifted, and the balance of the supporting weight 3 is maintained.

[0047] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A warning sign for municipal construction, characterized in that: Including the card body (1), the support column (2) and the support heavy block (3), one end of the support column (2) is fixedly connected to the card body (1), the other end of the support column (2) is fixedly connected to the upper end of the support heavy block (3); Still including the mounting plate (41) and the universal wheel (42), the universal wheel (42) is fixedly connected to the lower end of the mounting plate (41), the lower end of the support heavy block (3) is equipped with the installation groove (31), the mounting plate (41) is slidably connected to the groove wall of the installation groove (31), the mounting plate (41) slides up and down in the installation groove (31); Still including the first spring (43), the sliding plate (44), the pedal (45) and the sliding column (46), one end of the first spring (43) is fixedly connected to the upper end of the mounting plate (41), the other end of the first spring (43) is fixedly connected to the sliding plate (44), the sliding plate (44) is slidably connected to the groove wall of the installation groove (31), the outer wall of the support heavy block (3) is equipped with the communication groove (32), the communication groove (32) is communicated to the installation groove (31), one end of the pedal (45) fixedly connected to the sliding plate (44) is towards the communication groove (32), the pedal (45) extends out of the communication groove (32), the groove wall of the installation groove (31) is equipped with the sliding groove (33), the sliding column (46) is slidably connected to the groove wall of the sliding groove (33), the lower end of the sliding column (46) is used for the upper end of the sliding plate (44) to abut.

2. The warning sign for municipal construction according to claim 1, characterized in that: The second spring (47) of a kind of municipal construction warning board still includes, one end of the second spring (47) is fixedly connected to the groove bottom of the sliding groove (33), the other end of the second spring (47) is fixedly connected to one end of the sliding column (46) towards the groove bottom of the sliding groove (33), one end of the sliding column (46) towards the groove bottom of the installation groove (31) is equipped with the guide surface (461), the guide surface (461) is used for the lower end of the sliding plate (44) to abut.

3. A warning sign for municipal construction as claimed in claim 2 wherein: The second spring (47) of a kind of municipal construction warning board still includes, one end of the second spring (47) is fixedly connected to the groove bottom of the sliding groove (33), the other end of the second spring (47) is fixedly connected to one end of the sliding column (46) towards the groove bottom of the sliding groove (33), one end of the sliding column (46) towards the groove bottom of the installation groove (31) is equipped with the guide surface (461), the guide surface (461) is used for the lower end of the sliding plate (44) to abut. The gear (481), the first rack (482), the second rack (483) and the pressing plate (491) of a kind of municipal construction warning board still include, the outer wall of the support heavy block (3) is equipped with the connecting groove (34), the support heavy block (3) is equipped with the installation cavity (35), the installation cavity (35) is communicated to the sliding groove (33) and the connecting groove (34), the gear (481) is rotatably connected to the inner wall of installation cavity (35) around its axis, the rotation axis of the gear (481) is perpendicular to the sliding direction of the sliding column (46), the first rack (482) is fixedly connected to one end of the sliding column (46) towards the gear (481), the first rack (482) is engaged in the upper end of the gear (481), the second rack (483) is engaged in one end of the gear (481) away from the installation groove (31), one end of the pressing plate (491) is fixedly connected to one end of the second rack (483) towards the connecting groove (34), the other end of the pressing plate (491) extends out of the connecting groove (34).

4. The warning sign for municipal construction according to claim 1, characterized in that: The warning board for municipal construction further comprises a counterweight (51) and a rope (52), the lower end of the supporting weight (3) is provided with two placing grooves (36), the two placing grooves (36) are arranged on the two sides of the board body (1), the two placing grooves (36) are arranged on the two sides of the mounting groove (31), the counterweight (51) is provided with two, the counterweight (51) is slid in the placing groove (36) one by one, the supporting weight (3) is provided with a communication port (37), the two ends of the communication port (37) are communicated with the two placing grooves (36) respectively, the rope (52) passes through the communication port (37), and the two ends of the rope (52) are fixedly connected with the two counterweights (51) respectively, and the length of the rope (52) is greater than that of the communication port (37).

5. A warning sign for municipal construction according to claim 4, characterized in that: The warning board for municipal construction further comprises a stop block (53), the groove wall of the mounting groove (31) is provided with a sliding groove (38), the sliding groove (38) is arranged below the sliding groove (33), the sliding groove (38) is communicated with the placing groove (36), one end of the counterweight (51) towards the sliding groove (38) is provided with an embedding groove (511), the stop block (53) is slidably connected with the groove wall of the sliding groove (38), one end of the stop block (53) is used for abutting against the sliding plate (44), and the other end of the stop block (53) is used for embedding in the embedding groove (511).

6. A warning sign for municipal construction according to claim 5, characterized in that: The warning board for municipal construction further comprises a pushing plate (531) and a third spring (54), the groove wall of the sliding groove (38) is provided with a reset groove (39), one end of the stop block (53) towards the reset groove (39) is connected with the pushing plate (531), one end of the third spring (54) is fixedly connected with the groove wall of the reset groove (39), the other end of the third spring (54) is fixedly connected with the pushing plate (531), and the two ends of the stop block (53) are both provided with a round corner.

Citation Information

Patent Citations

  • Municipal warning sign that warning nature is strong

    CN207541894U