CN112376993A - Town road foundation ditch safety device - Google Patents
Town road foundation ditch safety device Download PDFInfo
- Publication number
- CN112376993A CN112376993A CN202010780096.3A CN202010780096A CN112376993A CN 112376993 A CN112376993 A CN 112376993A CN 202010780096 A CN202010780096 A CN 202010780096A CN 112376993 A CN112376993 A CN 112376993A
- Authority
- CN
- China
- Prior art keywords
- plate
- base plate
- vertical plate
- safety device
- protective net
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
- E04H17/16—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts using prefabricated panel-like elements, e.g. wired frames
- E04H17/161—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts using prefabricated panel-like elements, e.g. wired frames using wire panels
- E04H17/163—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts using prefabricated panel-like elements, e.g. wired frames using wire panels using wired panels with frame
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/604—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings
- E01F9/619—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings with reflectors; with means for keeping reflectors clean
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/658—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing
- E01F9/669—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing for fastening to safety barriers or the like
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/658—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing
- E01F9/673—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing for holding sign posts or the like
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
The invention discloses a municipal road foundation pit safety protection device which comprises a base plate and a supporting mechanism, wherein the base plate is fixedly connected with the base plate; a base plate: the side face of the base plate is in a convex shape, four groups of mounting holes are formed in the top end array of the base plate, the mounting holes are strip-shaped holes, each mounting hole is connected with the ground through two expansion bolts, the top end of the base plate is connected with a vertical plate through a bolt, a square through hole is formed in the middle of each vertical plate, a protective net is mounted in each square through hole, and each protective net is formed by weaving stainless steel wires; a support mechanism: include U type connecting seat, back shaft and fixing base, U type connecting seat is equipped with two sets ofly, and two sets of U type connecting seats are located the left and right sides of protection network, and pass through the bolt fastening at the trailing flank of riser, the one end of back shaft is passed through the bolt and is connected with U type connecting seat, and this safety device's factor of safety is high, wind resistance can the reinforce, and what can be stable fixes subaerial.
Description
Technical Field
The invention relates to the technical field of building construction equipment, in particular to a safety protection device for a municipal road foundation pit.
Background
Municipal works refer to municipal facility construction works, in China, municipal facilities refer to various buildings, structures, equipment and the like which are arranged in the planning construction range of urban areas and towns and provide paid or unpaid public products and services for residents based on government responsibility and obligation, the buildings in the current central urban areas are more and more dense, particularly, a large number of new high-rise and super high-rise buildings are built, a large number of deep foundation pits are dug and dug in the construction of municipal roads, a foundation pit protection device is a supporting, reinforcing and protecting measure adopted on the side wall of the foundation pit and the surrounding environment to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, so as to protect vehicles and pedestrians, the current foundation pit protection is mainly composed of surrounding plates, when strong wind weather occurs, the surrounding plates are influenced by wind, the surrounding plates easily cause the falling of the surrounding plates, smash passerby and even fall into the foundation pit, and have poor fixing effect with the ground, low stability and low safety factor.
Disclosure of Invention
The invention aims to overcome the existing defects and provides a municipal road foundation pit safety protection device which is high in safety factor and strong in wind resistance, can be stably fixed on the ground and can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a municipal road foundation pit safety protection device comprises a base plate and a supporting mechanism;
a base plate: the side face of the base plate is in a convex shape, four groups of mounting holes are formed in the top end array of the base plate, the mounting holes are strip-shaped holes, each mounting hole is connected with the ground through two expansion bolts, the top end of the base plate is connected with a vertical plate through a bolt, a square through hole is formed in the middle of each vertical plate, a protective net is mounted in each square through hole, and each protective net is formed by weaving stainless steel wires;
a support mechanism: the protective net comprises two groups of U-shaped connecting seats, two groups of supporting shafts and two fixing seats, wherein the two groups of U-shaped connecting seats are positioned on the left side and the right side of a protective net and fixed on the rear side face of a vertical plate through bolts;
wherein: the lamp tube seat is arranged on the rear side face of the vertical plate and located above the protective screen, and a lighting lamp tube is arranged in the lamp tube seat, the input end of the lighting lamp tube is electrically connected with the output end of the external control switch group, and the input end of the external control switch group is electrically connected with the output end of an external power supply.
Further, still include the bottom plate, the bottom plate is installed in the bottom of riser, and its bottom is rotated and is connected with two gyro wheels, the top of bed plate is equipped with the third recess that corresponds with the bottom plate, the bottom of third recess is equipped with and is located the gyro wheel standing groove that corresponds with the gyro wheel, and the bottom of riser is installed the gyro wheel, is convenient for the transportation of riser.
Further, the clamping cooperation between bottom plate and the third recess, the steadiness between bottom plate and the bed plate can be improved in the clamping cooperation.
Further, still include first recess, first recess is seted up in the leading flank of riser, and it is located the top position department of protection network, and its internally mounted has fluorescence warning sign, and fluorescence warning sign can make passerby observe the existence of riser night.
Further, still include the second recess, the second recess is seted up at the leading flank of riser, and the symmetric distribution is in the left and right sides of protection network, and its inside pasting has the reflection of light sign board, and each reflection of light sign board forms the streamline together, can remind passing vehicle, avoids the vehicle to travel the in-process night and hits to the riser.
Further, still include connection base, connection base is equipped with four groups, and the array is installed at the trailing flank of riser, and the round pin shaft hole has been seted up to its side, lies in through the round pin hub connection between two adjacent connection base on the different risers, sets up connection base and can be in the same place each riser hookup, improves the wind-resistant ability.
Further, still including returning style of calligraphy mounting panel, return style of calligraphy mounting panel and pass through the bolt fastening at the trailing flank of riser, the protection network is installed on the inner wall of returning style of calligraphy mounting panel, returns style of calligraphy mounting panel and conveniently installs and dismantle the protection network.
Further, the fixing base includes fixed plate, backup pad and ground nail, ground nail is equipped with four groups, and the array installs the bottom in the backup pad, the fixed plate is equipped with two, and parallel mount is on the top of backup pad, through bolted connection between two fixed plates and the back shaft, and the fixing base is convenient for fix subaerial, supports the back shaft.
Compared with the prior art, the invention has the beneficial effects that: this town road foundation ditch safety device has following benefit:
1. the municipal road foundation pit safety protection device adopts a mode of combining the vertical plates with the protective net to serve as a protective enclosing plate structure of the foundation pit, so that the strength of the vertical plates is maintained, the wind resistance can be reduced through the protective net, the vertical plates can still be kept stable in windy weather, and the vertical plates are connected together through the pin shafts, so that the installation stability of the safety protection device is improved;
2. the municipal road foundation pit safety protection device is characterized in that a fluorescent warning board and a reflective identification board are respectively arranged on the front side surfaces of vertical plates, the fluorescent warning board can emit light at night to remind passing pedestrians that a foundation pit exists in front of the vertical plates, the reflective identification board can provide a warning effect for vehicles running at night, and the reflective identification boards on the vertical plates form a streamline, so that the vehicles can be ensured to pass through the foundation pit area safely;
3. according to the municipal road foundation pit safety protection device, the supporting shaft for supporting the vertical plate is arranged on the rear side face of the vertical plate, one end of the supporting shaft is connected with the vertical plate, the other end of the supporting shaft is fixed on the ground, a supporting effect can be provided for the vertical plate in windy weather, the vertical plate is prevented from inclining to the ground, and meanwhile, the two ends of the supporting shaft are simple in connection mode and convenient to detach and install;
4. this town road foundation ditch safety device divide into two with whole protector bed plate and riser, only need during the installation with each bed plate install subaerial earlier, then install the riser on the bed plate in proper order can, the efficient of installation, the bottom of riser is equipped with the gyro wheel simultaneously, when transporting the riser, can roll along ground, the transportation of the riser of being convenient for shifts, is favorable to improving safety device's installation effectiveness.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic sectional view of the plane A-A of the present invention;
fig. 4 is a schematic view of the protective screening structure of the present invention.
In the figure: the novel LED lamp tube comprises a base plate 1, a mounting hole 2, a vertical plate 3, a supporting mechanism 4, a connecting seat 41U-shaped, a supporting shaft 42, a fixing seat 43, a fixing plate 431, a supporting plate 432, ground nails 433, a protective net 5, a mounting plate 6 shaped like Chinese character hui, a connecting base 7, a pin shaft 8, a lamp tube seat 9, a lighting lamp tube 10, a first groove 11, a fluorescent warning board 12, a second groove 13, a reflecting sign plate 14, a third groove 15, rollers 16, a bottom plate 17 and roller placement grooves 18.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a municipal road foundation pit safety protection device comprises a base plate 1 and a supporting mechanism 4;
base plate 1: the side surface is convex-shaped, the contact area between the two sides of the base plate 1 and the ground is large, the ground gripping ability is strong, four groups of mounting holes 2 are formed in the top end of the base plate 1 in an array mode, the mounting holes 2 are strip-shaped holes, each mounting hole 2 is connected with the ground through two expansion bolts, the position of the base plate 1 can be adjusted after the two expansion bolts are loosened, the top end of the base plate 1 is connected with a vertical plate 3 through bolts, a square through hole is formed in the middle of the vertical plate 3, a protective screen 5 is installed in the square through hole and is formed by weaving stainless steel wires, the protective screen 5 is arranged and used for reducing the resistance effect of wind and avoiding overlarge impact force of the wind on the vertical plate 3, the base plate further comprises a base plate 17, the base plate 17 is installed at the bottom end of the vertical plate 3, the bottom end of the base plate 17 is rotatably connected with two rollers 16, a third groove 15 corresponding to the, the bottom plate 17 is clamped and matched with the third groove 15, the bottom plate 17 is arranged and connected with the base plate 1, the wind-proof capability of the vertical plate 3 can be improved, meanwhile, the roller 16 is arranged to facilitate transportation of the vertical plate 3, and the vertical plate 3 and the base plate 1 are convenient to mount and dismount in use and can be repeatedly used;
the safety traffic safety protective device also comprises a first groove 11, wherein the first groove 11 is arranged on the front side surface of the vertical plate 3 and is positioned above the protective net 5, a fluorescent warning board 12 is arranged in the first groove, the fluorescent warning board 12 can emit light at night and display dangerous characters in front, and can provide warning effect for pedestrians, the safety traffic safety protective device also comprises a second groove 13, the second groove 13 is arranged on the front side surface of the vertical plate 3 and is symmetrically distributed on the left side and the right side of the protective net 5, a reflecting sign board 14 is adhered in the second groove, the reflecting sign boards 14 are connected together to form a group of channels, so that vehicles can safely run at night, the safety traffic safety protective device also comprises a connecting base 7, the connecting base 7 is provided with four groups, the array is arranged on the rear side surface of the vertical plate 3, the side surface of the connecting base is provided with pin shaft holes, two adjacent connecting bases 7 positioned, the connecting tightness of the vertical plates 3 can be improved, the vertical plates 3 can be protected, the wind resistance is improved, the vertical plate type wind-resistant device further comprises a square-shaped mounting plate 6, the square-shaped mounting plate 6 is fixed on the rear side face of the vertical plates 3 through bolts, a protective net 5 is mounted on the inner wall of the square-shaped mounting plate 6, and the protective net 5 is mounted through the square-shaped mounting plate 6 and convenient to mount and replace;
the supporting mechanism 4: the vertical plate fixing device comprises U-shaped connecting seats 41, supporting shafts 42 and fixing seats 43, wherein the U-shaped connecting seats 41 are provided with two groups, the two groups of U-shaped connecting seats 41 are positioned at the left side and the right side of a protective screen 5 and fixed on the rear side of a vertical plate 3 through bolts, one end of each supporting shaft 42 is connected with the U-shaped connecting seat 41 through bolts, the other end of each supporting shaft 42 is connected with the corresponding fixing seat 43 through bolts, the fixing seats 43 are fixed on the ground, the supporting shafts 42 are convenient to detach and install and can support the vertical plate 3, the fixing seats 43 comprise fixing plates 431, supporting plates 432 and ground nails 433, the ground nails 433 are provided with four groups and are arranged at the bottom ends of the supporting plates 432 in an array mode, the two fixing plates 431 are arranged at the top ends of the;
wherein: the underground coal mine underground.
When in use: at first, carry bed plate 1 to foundation ditch position department, and utilize expansion bolts to fix bed plate 1 subaerial, then install riser 3 in proper order in the third recess 15 on 1 top of every bed plate, and fix through the bolt, fix riser 3 after, link together two adjacent risers 3 that just are located the coplanar through round pin axle 8, and install back shaft 4 at the trailing flank of riser 3, the fixing base 43 of back shaft 4 tip is fixed subaerial through the ground nail, accomplish installation work promptly.
It should be noted that the core chip of the external control switch group disclosed in this embodiment is a PLC single chip, the specific model is STM32F101VBT6, the preferred model of the lighting lamp 10 is QY-1515, and the external control switch group controls the lighting lamp 10 to work by a method commonly used in the prior art.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a town road foundation ditch safety device which characterized in that: comprises a base plate (1) and a supporting mechanism (4);
base plate (1): the side face of the base plate is in a convex shape, four groups of mounting holes (2) are formed in the top end array of the base plate (1), the mounting holes (2) are strip-shaped holes, each mounting hole (2) is connected with the ground through two expansion bolts, the top end of the base plate (1) is connected with a vertical plate (3) through a bolt, a square through hole is formed in the middle of each vertical plate (3), a protective net (5) is arranged in each square through hole, and each protective net (5) is formed by weaving stainless steel wires;
support mechanism (4): the protective net comprises U-shaped connecting seats (41), supporting shafts (42) and fixing seats (43), wherein the U-shaped connecting seats (41) are provided with two groups, the two groups of U-shaped connecting seats (41) are positioned at the left side and the right side of a protective net (5) and fixed on the rear side face of a vertical plate (3) through bolts, one end of each supporting shaft (42) is connected with the U-shaped connecting seat (41) through a bolt, the other end of each supporting shaft is connected with the corresponding fixing seat (43) through a bolt, and the fixing seats (43) are fixed on the ground;
wherein: the novel LED lamp is characterized by further comprising a lamp tube seat (9), wherein the lamp tube seat (9) is installed on the rear side face of the vertical plate (3), is located above the protective screen (5), and is internally provided with an illuminating lamp tube (10), the input end of the illuminating lamp tube (10) is electrically connected with the output end of the external control switch group, and the input end of the external control switch group is electrically connected with the output end of an external power supply.
2. The municipal road foundation pit safety device of claim 1, wherein: the base plate is characterized by further comprising a bottom plate (17), the bottom plate (17) is installed at the bottom end of the vertical plate (3), the bottom end of the bottom plate is rotatably connected with two rollers (16), a third groove (15) corresponding to the bottom plate (17) is formed in the top end of the base plate (1), and roller placing grooves (18) corresponding to the rollers (16) are formed in the bottom end of the third groove (15).
3. The municipal road foundation pit safety device of claim 2, wherein: the bottom plate (17) is in clamping fit with the third groove (15).
4. The municipal road foundation pit safety device of claim 1, wherein: the novel vertical plate type solar energy collector is characterized by further comprising a first groove (11), wherein the first groove (11) is formed in the front side face of the vertical plate (3) and located above the protective net (5), and a fluorescent warning board (12) is installed inside the first groove.
5. The municipal road foundation pit safety device of claim 1, wherein: the novel protective net is characterized by further comprising second grooves (13), wherein the second grooves (13) are formed in the front side face of the vertical plate (3) and symmetrically distributed on the left side and the right side of the protective net (5), and reflective identification plates (14) are adhered to the inner portions of the second grooves.
6. The municipal road foundation pit safety device of claim 1, wherein: the vertical plate fixing device is characterized by further comprising four connecting bases (7), the four connecting bases (7) are arranged on the rear side face of the vertical plate (3), the array is installed on the rear side face of the vertical plate (3), pin shaft holes are formed in the side faces of the four connecting bases, and the two adjacent connecting bases (7) located on different vertical plates (3) are connected through pin shafts (8).
7. The municipal road foundation pit safety device of claim 1, wherein: still include back style of calligraphy mounting panel (6), back style of calligraphy mounting panel (6) pass through the bolt fastening at the trailing flank of riser (3), protection network (5) are installed on the inner wall of back style of calligraphy mounting panel (6).
8. The municipal road foundation pit safety device of claim 1, wherein: fixing base (43) include fixed plate (431), backup pad (432) and ground nail (433), ground nail (433) are equipped with four groups, and the bottom at backup pad (432) is installed to the array, fixed plate (431) are equipped with two, and parallel mount is on the top of backup pad (432), pass through bolted connection between two fixed plates (431) and back shaft (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010780096.3A CN112376993A (en) | 2020-08-05 | 2020-08-05 | Town road foundation ditch safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010780096.3A CN112376993A (en) | 2020-08-05 | 2020-08-05 | Town road foundation ditch safety device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112376993A true CN112376993A (en) | 2021-02-19 |
Family
ID=74586425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010780096.3A Withdrawn CN112376993A (en) | 2020-08-05 | 2020-08-05 | Town road foundation ditch safety device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112376993A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100301294A1 (en) * | 2009-06-01 | 2010-12-02 | Pasqualini Tony L | Construction site fence panel foot boot |
| CN105587161A (en) * | 2014-10-24 | 2016-05-18 | 夏安娜 | Building fence for civil engineering |
| CN205531652U (en) * | 2016-01-29 | 2016-08-31 | 马太军 | Municipal works rail |
| CN207513321U (en) * | 2017-12-01 | 2018-06-19 | 重庆交通大学 | A kind of building enclosing wall with decrease of noise functions |
| CN209040688U (en) * | 2018-11-12 | 2019-06-28 | 河北建设集团股份有限公司 | A kind of municipal works construction coaming plate |
| CN209429680U (en) * | 2019-01-17 | 2019-09-24 | 河南东方建设集团发展有限公司 | A kind of safe enclosing of building engineering construction |
| CN210066595U (en) * | 2019-04-25 | 2020-02-14 | 四川交通职业技术学院 | Movable protective fence for building construction |
-
2020
- 2020-08-05 CN CN202010780096.3A patent/CN112376993A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100301294A1 (en) * | 2009-06-01 | 2010-12-02 | Pasqualini Tony L | Construction site fence panel foot boot |
| CN105587161A (en) * | 2014-10-24 | 2016-05-18 | 夏安娜 | Building fence for civil engineering |
| CN205531652U (en) * | 2016-01-29 | 2016-08-31 | 马太军 | Municipal works rail |
| CN207513321U (en) * | 2017-12-01 | 2018-06-19 | 重庆交通大学 | A kind of building enclosing wall with decrease of noise functions |
| CN209040688U (en) * | 2018-11-12 | 2019-06-28 | 河北建设集团股份有限公司 | A kind of municipal works construction coaming plate |
| CN209429680U (en) * | 2019-01-17 | 2019-09-24 | 河南东方建设集团发展有限公司 | A kind of safe enclosing of building engineering construction |
| CN210066595U (en) * | 2019-04-25 | 2020-02-14 | 四川交通职业技术学院 | Movable protective fence for building construction |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication | ||
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Application publication date: 20210219 |