CN114038221B - Traffic light with wireless device - Google Patents
Traffic light with wireless device Download PDFInfo
- Publication number
- CN114038221B CN114038221B CN202111498209.1A CN202111498209A CN114038221B CN 114038221 B CN114038221 B CN 114038221B CN 202111498209 A CN202111498209 A CN 202111498209A CN 114038221 B CN114038221 B CN 114038221B
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- CN
- China
- Prior art keywords
- block
- wireless device
- locking
- groove
- drives
- Prior art date
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- 230000003028 elevating effect Effects 0.000 claims description 30
- 230000005540 biological transmission Effects 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 9
- 230000009194 climbing Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/095—Traffic lights
- G08G1/0955—Traffic lights transportable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Traffic Control Systems (AREA)
Abstract
The invention belongs to the technical field of traffic lights, in particular to a traffic light with a wireless device, which aims at the problems that the existing traffic lights are installed at high positions and are fixed by screws, workers are required to climb up for maintenance during maintenance, and dangerousness exists in high-altitude operation. The invention can avoid the staff climbing to maintain, avoid the danger of high-altitude operation, and simultaneously can facilitate the disassembly and maintenance of the traffic light body and the wireless device.
Description
Technical Field
The invention relates to the technical field of traffic lights, in particular to a traffic light with a wireless device.
Background
The traffic lights are signal lights for directing road traffic, the red lights indicate stop, the yellow lights represent warning, the green lights indicate pass, and the traffic lights can guide vehicles and pedestrians to pass safely and orderly. At present, a traffic light is usually arranged at an intersection and automatically controlled, and along with the development of science and technology, an automobile becomes a main travel vehicle;
The automobile also has the unmanned technique, and present unmanned automobile all sends next step instruction through the colour of discernment traffic lights, and this kind of control mode is comparatively ordinary, and the security is low, has now put forward a mode, through adding wireless device in the traffic lights, then the automobile receives wireless signal, judges, can improve the accuracy of judging traffic lights.
The existing traffic lights are installed at high places, and when the wireless device or the traffic lights fail through screw fixation, the existing maintenance mode is that workers climb high to maintain, and dangers exist in high-altitude operation.
Disclosure of Invention
The invention aims to solve the problems that the existing traffic lights are installed at high positions, and the existing traffic lights are fixed by screws, so that workers are required to climb up for maintenance during maintenance, and dangers exist in high-altitude operation.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The utility model provides a traffic lights with wireless device, including the traffic lights body, wireless device, bottom plate and hollow stand, hollow stand installs the top at the bottom plate, install elevating system in the hollow stand, be connected with the elevating system on the elevating system, elevating system and hollow stand sliding connection, the connecting plate is installed in the outside of elevating system, install the locking piece on the connecting plate, be connected with the backup pad on the locking piece, the locking groove has been seted up in the backup pad, locking piece and locking groove swing joint, install magnet on the inner wall of locking groove, magnet attracts with the locking piece, the locking inslot is connected with one-way kelly, be connected with lever mechanism on the one-way kelly, the traffic lights body is installed in the backup pad, wireless device installs the top at the traffic lights body, wireless device includes the protective housing, install the monitoring module in the protective housing, wireless transmission module, judge the module, be connected with automobile signal receiving module on the wireless transmission module, the monitoring module is the camera.
Preferably, the lifting mechanism comprises a motor, a driving shaft is connected to the motor, a driving wheel is connected to the driving shaft, a driven shaft is rotatably mounted on the hollow upright post, a driven wheel is sleeved on the outer side of the driven shaft, the driving wheel is in transmission connection with the outer side of the driven wheel, and the same conveying belt is connected with the lifting block.
Preferably, the outside of hollow stand has seted up the bar hole, and lifting block and the inner wall sliding connection in bar hole.
Preferably, the bottom of backup pad has been seted up the through-hole, and one-way draw-in lever and through-hole sliding connection, the hypotenuse groove has been seted up to the bottom of locking piece, one-way draw-in lever and the one-way joint in hypotenuse groove, has seted up the spacing groove on the inner wall of through-hole, and slidable mounting has the stopper in the spacing groove, and the stopper links to each other with one-way draw-in lever, installs same spring between stopper and the inner wall in spacing groove.
Preferably, the lever mechanism comprises a fixed rod and a pressure rod, the fixed rod is arranged at the bottom of the supporting plate, the pressure rod is rotatably arranged on the fixed rod, one end of the pressure rod is connected with a shaft pin, the bottom end of the one-way clamping rod is provided with a pull ring, the shaft pin is movably connected with the pull ring, the outer side of the hollow upright post is provided with an L-shaped extrusion plate, and the L-shaped extrusion plate is matched with the pressure rod.
Compared with the prior art, the invention has the advantages that:
According to the scheme, the motor and the driving shaft drive the driving wheel to rotate, the driving wheel drives the conveying belt through the cooperation of the driven wheel, the conveying belt drives the lifting block, the lifting block drives the connecting plate to move up and down, the connecting plate drives the supporting plate to adjust the height through the locking block, and the supporting plate drives the traffic light body and the wireless device to adjust the height, so that staff can be prevented from climbing up for maintenance, and the working danger is reduced;
According to the technical scheme, when the supporting plate moves downwards, the supporting plate extrudes the pressing rod, the pressing rod drives the one-way clamping rod to move downwards through the shaft pin and the pull ring, the one-way clamping rod provides upward elastic force for the one-way clamping rod to the spring, the one-way clamping rod leaves the bevel groove, the fixing of the locking block can be relieved, the supporting plate can be connected with the locking block through the magnet, and the traffic light body and the wireless device are convenient to take down; maintaining;
according to the scheme, the wireless transmitting module transmits signals, the automobile signal receiving module is installed in an automobile, the wireless transmitting module transmits signals, the automobile signal receiving module receives signals, the judging module judges that the automobile is in a red light state or a green light state, and then the monitoring module monitors the automobile;
the invention can avoid the staff climbing to maintain, avoid the danger of high-altitude operation, and simultaneously can facilitate the disassembly and maintenance of the traffic light body and the wireless device.
Drawings
Fig. 1 is a schematic structural diagram of a traffic light with a wireless device according to the present invention;
FIG. 2 is a schematic diagram of the portion A in FIG. 1 according to the present invention;
Fig. 3 is a schematic structural diagram of a wireless device according to the present invention;
Fig. 4 is a block diagram of a wireless device according to the present invention;
fig. 5 is a perspective view of a one-way locking lever according to the present invention.
In the figure: 1. traffic light body; 2. a wireless device; 3. a bottom plate; 4. a hollow upright; 5. a motor; 6. a drive shaft; 7. a driving wheel; 8. a driven shaft; 9. driven wheel; 10. a conveyor belt; 11. a support plate; 12. a bar-shaped hole; 13. an L-shaped extrusion plate; 14. a baffle; 15. a solar panel; 16. a lifting block; 17. a connecting plate; 18. a locking block; 19. a locking groove; 20. a magnet; 21. a through hole; 22. a one-way clamping rod; 23. a fixed rod; 24. a compression bar; 25. a pull ring; 26. a shaft pin; 27. a limiting block; 28. a spring; 29. a limit groove; 30. a camera; 31. a wireless transmitting module; 32. a judging module; 33. hypotenuse grooves.
Detailed Description
The technical solutions of the present embodiment will be clearly and completely described below with reference to the drawings in the present embodiment, and it is apparent that the described embodiments are only some embodiments of the present embodiment, not all embodiments.
Example 1
Referring to fig. 1-5, a traffic light with wireless device, including traffic light body 1, wireless device 2, bottom plate 3 and hollow stand 4, hollow stand 4 installs at the top of bottom plate 3, install elevating system in the hollow stand 4, be connected with elevating block 16 on the elevating system, elevating block 16 and hollow stand 4 sliding connection, connecting plate 17 is installed in the outside of elevating block 16, install locking piece 18 on the connecting plate 17, be connected with backup pad 11 on the locking piece 18, set up locking groove 19 on the backup pad 11, locking piece 18 and locking groove 19 swing joint, install magnet 20 on the inner wall of locking groove 19, magnet 20 attracts with locking piece 18, locking groove 19 is connected with one-way draw-in lever 22, be connected with lever mechanism on the one-way draw-in lever 22, traffic light body 1 installs on backup pad 11, wireless device 2 installs at the top of traffic light body 1, wireless device 2 includes the protective housing, install the monitoring module in the protective housing, wireless transmission module 31, judge module 32, be connected with automobile signal receiving module on the wireless transmission module 31, the monitoring module is camera 30.
In this embodiment, elevating system includes motor 5, be connected with drive shaft 6 on the motor 5, be connected with drive wheel 7 on the drive shaft 6, driven shaft 8 is installed to the internal rotation of hollow stand 4, driven shaft 8's outside cover is equipped with from driving wheel 9, drive wheel 7 is connected with same conveyer belt 10 with the outside transmission from driving wheel 9, conveyer belt 10 links to each other with elevating block 16, bar hole 12 has been seted up in the outside of hollow stand 4, elevating block 16 and the inner wall sliding connection in bar hole 12, elevating system is used for adjusting traffic light body 1, the height of wireless device 2, avoid the high altitude construction of staff.
In this embodiment, the bottom of the supporting plate 11 is provided with a through hole 21, the unidirectional clamping rod 22 is slidably connected with the through hole 21, the bottom of the locking block 18 is provided with a hypotenuse groove 33, the unidirectional clamping rod 22 is unidirectionally clamped with the hypotenuse groove 33, the inner wall of the through hole 21 is provided with a limiting groove 29, a limiting block 27 is slidably mounted in the limiting groove 29, the limiting block 27 is connected with the unidirectional clamping rod 22, the same spring 28 is mounted between the limiting block 27 and the inner wall of the limiting groove 29, and the unidirectional clamping rod 22 is provided with elastic force through the spring 28, so that the unidirectional clamping rod 22 enters the hypotenuse groove 33, and the locking block 18 can be connected with the supporting plate 11.
In this embodiment, the lever mechanism includes dead lever 23, depression bar 24, and the bottom at backup pad 11 is installed to dead lever 23, and depression bar 24 rotates to be installed on dead lever 23, and the one end of depression bar 24 is connected with pivot 26, and pull ring 25 is installed to the bottom of one-way draw-in lever 22, pivot 26 and pull ring 25 swing joint, and L type stripper plate 13 is installed in the outside of hollow stand 4, and L type stripper plate 13 and depression bar 24 looks adaptation, and the lever mechanism of setting is used for releasing the connection of locking piece 18 and backup pad 11.
In this embodiment, when in use, the motor 5 drives the driving shaft 6 to rotate, the driving shaft 6 drives the driving wheel 7 to rotate, the driving wheel 7 drives the conveying belt 10 through the cooperation of the driven wheel 9, the conveying belt 10 drives the lifting block 16, the lifting block 16 drives the connecting plate 17 to move up and down, the connecting plate 17 drives the supporting plate 11 through the locking block 18 to adjust the height, the supporting plate 11 drives the traffic light body 1 and the wireless device 2 to adjust the height, when the supporting plate 11 moves downwards, the supporting plate 11 presses the pressing rod 24, the pressing rod 24 drives the unidirectional clamping rod 22 to move downwards through the shaft pin 26 and the pull ring 25, the unidirectional clamping rod 22 provides upward elastic force for the unidirectional clamping rod 22 to the spring 28, so that the unidirectional clamping rod 22 leaves the bevel groove 33, the fixation of the locking block 18 can be released, the supporting plate 11 can be connected with the locking block 18 through the magnet 20, the traffic light body 1 and the wireless device 2 can be taken down, the maintenance is carried out, the locking block 18 is connected with the locking groove 19, the motor 5 is reversely started through the attraction of the magnet 20, the conveyor belt 10 drives the lifting block 16 to move upwards, the lifting block 16 drives the supporting plate 11 to move upwards through the connecting plate 17 and the locking block 18, the supporting plate 11 drives the traffic light body 1 and the wireless device 2 to move upwards, the L-shaped extrusion plate 13 leaves the compression bar 24, the unidirectional clamping rod 22 enters the bevel groove 33 under the elastic force of the spring 28, the locking block 18 can be connected with the supporting plate 11, the traffic light body 1 and the wireless device 2 are reset to be used continuously, the wireless transmitting module 31 transmits signals, the automobile signal receiving module is installed in an automobile, the wireless transmitting module 31 transmits signals, the automobile signal receiving module receives signals, the judging module 32 judges that the automobile is in a red light state or a green light state, and then the automobile is monitored by the monitoring module.
Example two
Referring to fig. 1-5, a traffic light with wireless device, including traffic light body 1, wireless device 2, bottom plate 3 and hollow stand 4, hollow stand 4 installs at the top of bottom plate 3, install elevating system in the hollow stand 4, be connected with elevating block 16 on the elevating system, elevating block 16 and hollow stand 4 sliding connection, connecting plate 17 is installed in the outside of elevating block 16, install locking piece 18 on the connecting plate 17, be connected with backup pad 11 on the locking piece 18, set up locking groove 19 on the backup pad 11, locking piece 18 and locking groove 19 swing joint, install magnet 20 on the inner wall of locking groove 19, magnet 20 attracts with locking piece 18, locking groove 19 is connected with one-way draw-in lever 22, be connected with lever mechanism on the one-way draw-in lever 22, traffic light body 1 installs on backup pad 11, wireless device 2 installs at the top of traffic light body 1, wireless device 2 includes the protective housing, install the monitoring module in the protective housing, wireless transmission module 31, judge module 32, be connected with automobile signal receiving module on the wireless transmission module 31, the monitoring module is camera 30.
In this embodiment, elevating system includes motor 5, be connected with drive shaft 6 on the motor 5, be connected with drive wheel 7 on the drive shaft 6, driven shaft 8 is installed to the internal rotation of hollow stand 4, driven shaft 8's outside cover is equipped with from driving wheel 9, drive wheel 7 is connected with same conveyer belt 10 with the outside transmission from driving wheel 9, conveyer belt 10 links to each other with elevating block 16, bar hole 12 has been seted up in the outside of hollow stand 4, elevating block 16 and the inner wall sliding connection in bar hole 12, elevating system is used for adjusting traffic light body 1, the height of wireless device 2, avoid the high altitude construction of staff.
In this embodiment, the bottom of the supporting plate 11 is provided with a through hole 21, the unidirectional clamping rod 22 is slidably connected with the through hole 21, the bottom of the locking block 18 is provided with a hypotenuse groove 33, the unidirectional clamping rod 22 is unidirectionally clamped with the hypotenuse groove 33, the inner wall of the through hole 21 is provided with a limiting groove 29, a limiting block 27 is slidably mounted in the limiting groove 29, the limiting block 27 is connected with the unidirectional clamping rod 22, the same spring 28 is mounted between the limiting block 27 and the inner wall of the limiting groove 29, and the unidirectional clamping rod 22 is provided with elastic force through the spring 28, so that the unidirectional clamping rod 22 enters the hypotenuse groove 33, and the locking block 18 can be connected with the supporting plate 11.
In this embodiment, the lever mechanism includes dead lever 23, depression bar 24, and the bottom at backup pad 11 is installed to dead lever 23, and depression bar 24 rotates to be installed on dead lever 23, and the one end of depression bar 24 is connected with pivot 26, and pull ring 25 is installed to the bottom of one-way draw-in lever 22, pivot 26 and pull ring 25 swing joint, and L type stripper plate 13 is installed in the outside of hollow stand 4, and L type stripper plate 13 and depression bar 24 looks adaptation, and the lever mechanism of setting is used for releasing the connection of locking piece 18 and backup pad 11.
In this embodiment, a baffle 14 is mounted on top of the support plate 11, and a solar panel 15 is connected to the baffle 14.
In this embodiment, the second embodiment is different from the first embodiment in that: the solar panel 15 can convert solar energy into electric energy and store the electric energy for standby.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art will be able to apply equally to the technical solution of the present invention and the inventive concept thereof, within the scope of the present invention.
Claims (1)
1. The utility model provides a traffic light with wireless device, including traffic light body (1), wireless device (2), bottom plate (3) and hollow stand (4), a serial communication port, hollow stand (4) are installed at the top of bottom plate (3), install elevating system in hollow stand (4), be connected with elevating block (16) on the elevating system, elevating block (16) and hollow stand (4) sliding connection, connecting plate (17) are installed in the outside of elevating block (16), install locking piece (18) on connecting plate (17), be connected with backup pad (11) on locking piece (18), set up locking groove (19) on backup pad (11), locking piece (18) and locking groove (19) swing joint, locking groove (19) in-connection has unidirectional clamping bar (22), be connected with lever mechanism on unidirectional clamping bar (22), traffic light body (1) are installed on backup pad (11), wireless device (2) are installed at the top of traffic light body (1), wireless device (2) are including the protective housing, install monitoring module in the protective housing, wireless transmission module (31), judge on wireless transmission module (31), wireless transmission module (31) are connected with monitoring module (30) for camera shooting module.
The lifting mechanism comprises a motor (5), a driving shaft (6) is connected to the motor (5), a driving wheel (7) is connected to the driving shaft (6), a driven shaft (8) is rotatably installed on the hollow upright post (4), a driven wheel (9) is sleeved on the outer side of the driven shaft (8), the driving wheel (7) is in transmission connection with the outer side of the driven wheel (9) with the same conveying belt (10), and the conveying belt (10) is connected with a lifting block (16);
The outer side of the hollow upright post (4) is provided with a strip-shaped hole (12), and the lifting block (16) is in sliding connection with the inner wall of the strip-shaped hole (12);
a magnet (20) is arranged on the inner wall of the locking groove (19), and the magnet (20) is attracted to the locking block (18);
a through hole (21) is formed in the bottom of the supporting plate (11), a one-way clamping rod (22) is connected with the through hole (21) in a sliding mode, a bevel groove (33) is formed in the bottom of the locking block (18), and the one-way clamping rod (22) is in one-way clamping connection with the bevel groove (33);
A limiting groove (29) is formed in the inner wall of the through hole (21), a limiting block (27) is slidably mounted in the limiting groove (29), the limiting block (27) is connected with the one-way clamping rod (22), and the same spring (28) is mounted between the limiting block (27) and the inner wall of the limiting groove (29);
The lever mechanism comprises a fixed rod (23) and a pressing rod (24), wherein the fixed rod (23) is arranged at the bottom of the supporting plate (11), the pressing rod (24) is rotatably arranged on the fixed rod (23), one end of the pressing rod (24) is connected with a shaft pin (26), the bottom end of the one-way clamping rod (22) is provided with a pull ring (25), and the shaft pin (26) is movably connected with the pull ring (25);
an L-shaped extrusion plate (13) is arranged on the outer side of the hollow upright post (4), and the L-shaped extrusion plate (13) is matched with the compression rod (24);
When the device is used, the motor (5) drives the driving shaft (6) to rotate, the driving shaft (6) drives the driving wheel (7) to rotate, the driving wheel (7) drives the conveying belt (10) through the matching of the driven wheel (9), the conveying belt (10) drives the lifting block (16), the lifting block (16) drives the connecting plate (17) to move up and down, the connecting plate (17) drives the supporting plate (11) to adjust the height through the locking block (18), the supporting plate (11) drives the traffic light body (1) and the wireless device (2) to adjust the height, when the supporting plate (11) moves downwards, the supporting plate (11) extrudes the pressing rod (24), the pressing rod (24) drives the unidirectional clamping rod (22) to move downwards through the shaft pin (26) and the pull ring (25), the unidirectional clamping rod (22) provides upward elastic force for the unidirectional clamping rod (22) to enable the unidirectional clamping rod (22) to leave the bevel groove (33), the fixing of the locking block (18) can be released, the supporting plate (11) can be connected with the locking block (18) through the magnet (20), the traffic light body (1) and the wireless device (2) can be taken down, the green light device (19) can be mutually connected with the magnet (19) through the magnet (20), reverse start motor (5) for conveyer belt (10) drive elevating block (16) upward movement, elevating block (16) drive backup pad (11) upward movement through connecting plate (17) and locking piece (18), backup pad (11) drive traffic lights body (1) and wireless device (2) upward movement, make L type stripper plate (13) leave depression bar (24), under the elasticity effect of spring (28), make one-way draw-in bar (22) get into in hypotenuse groove (33), can be connected locking piece (18) and backup pad (11), make traffic lights body (1) and wireless device (2) reset and continue to use, through wireless transmitting module (31) transmission signal, install inside the car signal receiving module, wireless transmitting module (31) transmission signal, through car signal receiving module reception signal, judge module (32) judge, the car is in red light state or green light state, then monitor the car through monitoring module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111498209.1A CN114038221B (en) | 2021-12-09 | 2021-12-09 | Traffic light with wireless device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111498209.1A CN114038221B (en) | 2021-12-09 | 2021-12-09 | Traffic light with wireless device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114038221A CN114038221A (en) | 2022-02-11 |
| CN114038221B true CN114038221B (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111498209.1A Active CN114038221B (en) | 2021-12-09 | 2021-12-09 | Traffic light with wireless device |
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| Country | Link |
|---|---|
| CN (1) | CN114038221B (en) |
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| CN214832134U (en) * | 2021-05-06 | 2021-11-23 | 济南川聚信息工程有限公司 | Stop-forbidden signboard with quick dismantlement formula |
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