CN112681781A - Falling protection equipment based on induction sensor - Google Patents
Falling protection equipment based on induction sensor Download PDFInfo
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- CN112681781A CN112681781A CN202011475407.1A CN202011475407A CN112681781A CN 112681781 A CN112681781 A CN 112681781A CN 202011475407 A CN202011475407 A CN 202011475407A CN 112681781 A CN112681781 A CN 112681781A
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Abstract
The invention relates to a falling protection device based on an induction sensor, wherein the falling protection device is arranged on the outer side of a wall body and comprises a fixed rope and a plurality of positioning rings, the fixed rope is longitudinally arranged, the lower end of the fixed rope is fixedly arranged on the ground on the outer side of the wall body, the upper end of the fixed rope is fixedly arranged on the upper end of the outer side of the wall body, the plurality of positioning rings are sleeved on the fixed rope in a sliding mode, two adjacent positioning rings are connected through an elastic inhaul cable, each positioning ring comprises a ring body and a hydraulic bag, the ring bodies and the hydraulic bags are circular, the outer sides of the circumferences of the hydraulic bags are fixedly arranged on the inner sides of the ring bodies, the inner sides of the circumferences of the hydraulic bags are attached to the outer sides of the circumferences of the fixed ropes, the hydraulic bags are communicated to a. The invention aims to solve or at least reduce the problems of high recoil force and high volatile effect of the existing anti-falling device on constructors, and provides falling protection equipment based on an induction sensor.
Description
Technical Field
The invention relates to the technical field of construction protection equipment, in particular to falling protection equipment based on an induction sensor.
Background
With the development of society and economy, the living standard of people is continuously improved, the urbanization level of the society is continuously improved at present, the city is continuously expanded and enlarged, a plurality of buildings need to be built in the expansion process of the city, the buildings need to be decorated after being built, and the building is exposed outside the buildings when a fitter decorates the outer walls of the buildings, so that the building is high in danger when falling at a high place. The anti-falling device in the existing market is generally the same in structure, and on the one hand, the anti-falling device in the building decoration construction in the market is low in adaptability. Constructor can have great impact force when falling, but present majority anti-falling device only can hoist when constructor falls, causes great counter impact force to constructor, though can not make constructor fall but still can lead to the fact the damage to constructor. Most of the existing anti-falling devices are complex mechanical structures, the conditions of construction sites are complex, sundries are easy to block an action mechanism of the anti-falling device, and the phenomenon that the anti-falling device fails occurs.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, solve or at least reduce the problems of large recoil force and high volatile effect of the existing anti-falling device on constructors, and provide falling protection equipment based on an induction sensor.
The invention is realized by the following technical scheme:
the utility model provides a protective equipment falls based on inductive transducer, protective equipment sets up in the wall body outside falls, protective equipment falls includes a fixed solid rope and a plurality of position circle, fixed solid vertical setting of restricting, fixed solid fixed the fixed ground that sets up in the wall body outside of lower extreme, upper end are fixed to be set up in wall body outside upper end, a plurality of position circle slip registrate in fixed solid rope, connect through the elasticity cable between two adjacent position circles, and the position circle includes circle body and hydraulic pressure bag, circle body and hydraulic pressure bag all are the ring form, the fixed setting in the circle body inboard in the hydraulic pressure bag circumference outside, the inboard and the fixed solid rope circumference outside laminating of hydraulic pressure bag circumference, hydraulic pressure bag intercommunication to the hydraulic pump, circle body pass through rope fixed connection to constructor, constructor wears acceleration sensor.
In order to further implement the present invention, the following technical solutions may be preferably selected:
preferably, the ring body is a circular ring-shaped shell, and the hydraulic bag is communicated with the ring body in a sealing manner; and/or a plurality of friction plates are arranged on the inner side of the circumference of the hydraulic bag in an array mode, and the friction plates are in a circular ring shape corresponding to the fixing ropes.
Preferably, be provided with the overhead tank between hydraulic pump and the hydraulic bag, the play liquid end of hydraulic pump communicates to the overhead tank, the overhead tank communicates to each hydraulic bag, is provided with first check valve between hydraulic pump and the overhead tank, the circulation direction of first check valve is the direction of hydraulic pump flow direction overhead tank, all is provided with second check valve and feed liquor solenoid valve between overhead tank and each hydraulic bag, the circulation direction of second check valve is the direction of overhead tank flow direction hydraulic bag, the feed liquor solenoid valve is connected with acceleration sensor.
Preferably, the falling protection device is further provided with a pressure relief tank, the pressure relief tank is communicated to each hydraulic bag, the pressure relief tank is communicated to the liquid inlet end of the hydraulic pump, and a liquid outlet electromagnetic valve is arranged between the pressure relief tank and each hydraulic bag.
Preferably, the position circle is provided with distance sensor, distance sensor is used for measuring the distance value between two adjacent position circles, and distance sensor is connected with liquid outlet solenoid valve and liquid inlet solenoid valve.
Preferably, the protective equipment that falls still includes prevents weighing down the net subassembly, prevent weighing down the net subassembly and set up in wall body outside lower part, the protecting net includes translation arm, expansion piece and protecting net, two translation arm parallel interval sets up and equal perpendicular to wall body, translation arm tip and wall body fixed connection, two the expansion arm slides respectively along translation arm length direction and sets up in two translation arms, and a plurality of expansion piece slides along expansion arm length direction and sets up in the expansion arm, the protecting net both sides are fixed respectively and are set up the expansion piece on two expansion arms.
Preferably, the middle part of the unfolding arm is transversely and fixedly provided with a sliding rail, the two ends of the unfolding arm are respectively and rotatably provided with belt wheels, the two belt wheels are connected through belt transmission, and the sliding rail is positioned in a space surrounded by belts.
Preferably, the expansion block comprises an end block and a middle block, the middle blocks are arranged in a transverse array mode, the end blocks are located at two ends of the middle blocks respectively, the end block and the middle block are arranged on the slide rail in a sliding mode, and the two end blocks are fixedly connected with the belt located on the upper side and the belt located on the lower side respectively.
Preferably, the number of the middle blocks is even, two short connecting rods are hinged to the side faces of the end blocks, two long connecting rods are hinged to the side faces of the middle blocks, the end parts of the short connecting rods are hinged to the end blocks, the other ends of the short connecting rods are hinged to the end parts of the long connecting rods of the middle blocks adjacent to the end blocks, the middle parts of the long connecting rods are hinged to the middle blocks, and two ends of each long connecting rod are hinged to the end parts of the short connecting rods or the long connecting rods of the adjacent middle blocks or the end;
the middle part of the unfolding arm is fixedly provided with a vertical guide rail, and the hinged parts of the long connecting rods of the two middle blocks at the middle part are longitudinally arranged on the guide rail in a sliding manner.
Preferably, expand the piece upper end and be provided with the hydraulic pressure vaulting pole, the vertical setting of hydraulic pressure vaulting pole, the stiff end of hydraulic pressure vaulting pole is fixed to be inlayed in expanding the piece, and the flexible end of hydraulic pressure vaulting pole upwards stretches out and with protecting net fixed connection.
Through the technical scheme, the invention has the beneficial effects that:
according to the invention, hydraulic oil is injected into the hydraulic bag, so that the hydraulic bag expands to generate a larger friction force with the fixed rope, and the plurality of positioning rings act simultaneously to gradually increase the friction force, slow down the counter-impact force and avoid the damage of the counter-impact force to falling constructors.
The invention has simple and reliable structure, quick response and difficult jamming phenomenon, and is provided with a plurality of positioning rings to further improve the reliability.
The anti-falling net assembly is further arranged, so that after the constructors fall off from the positioning ring, the constructors can still intercept the construction objects through the protection net to provide safety guarantee for the construction objects, the protection net can be folded when not in use, and the influence on normal construction can not be caused, the protection net judges the falling condition and the falling route of the falling constructors through the sensor, so that the protection net is positioned below the falling constructors, the space occupied by the protection net is reduced, and the normal construction is further guaranteed.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the connection of the fixing rope and the positioning ring of the present invention;
FIG. 3 is a schematic view of the retainer ring of the present invention;
FIG. 4 is a structural cross-sectional view of the cage of the present invention;
FIG. 5 is a top view of the cage of the present invention;
FIG. 6 is a schematic structural view of the fall arrest net assembly of the present invention;
FIG. 7 is a side view of the fall arrest net assembly of the present invention;
FIG. 8 is a front elevational view of the fall arrest net assembly of the present invention;
FIG. 9 is a schematic view of the connection of the deployment arm and deployment block of the present invention;
FIG. 10 is a side view of the connection of the deployment arm and deployment block of the present invention;
FIG. 11 is a schematic view of the deployment arm of the present invention;
FIG. 12 is a schematic structural view of an end block of the present invention;
FIG. 13 is a schematic structural view of a center block of the present invention;
FIG. 14 is an electrical schematic of the fall arrest net assembly of the present invention;
wherein: 1-fixing a rope; 2-positioning ring; 3-a hydraulic pump; 4-pressure tank; 5-a pressure relief tank; 6-unfolding the arm; 7-unfolding the block; 8-a protection net; 9-a slide rail; 10-a pulley; 11-a belt; 12-short link; 13-a long connecting rod; 14-a guide rail; 15-hydraulic stay bar; 201-ring body; 202-a hydraulic bladder; 203-friction plate; 701-end block; 702-middle block.
Detailed Description
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
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.
Example 1:
as shown in fig. 1-14, a fall protection device based on an induction sensor, the fall protection device is arranged on the outer side of a wall body, the fall protection device comprises a fixed rope 1 and a plurality of positioning rings 2, the fixed rope 1 is longitudinally arranged, the lower end of the fixed rope 1 is fixedly arranged on the ground on the outer side of the wall body, the upper end of the fixed rope is fixedly arranged on the upper end of the outer side of the wall body, the plurality of positioning rings 2 are slidably sleeved on the fixed rope 1, two adjacent positioning rings 2 are connected through an elastic cable, each positioning ring 2 comprises a ring body 201 and a hydraulic bag 202, the ring body 201 and the hydraulic bag 202 are both in a circular ring shape, the outer side of the circumference of the hydraulic bag 202 is fixedly arranged on the inner side of the ring body 201, the inner side of the circumference of the hydraulic bag 202 is attached to the outer side of the fixed rope 1, the hydraulic bag 202 is communicated to a hydraulic pump 3.
In order to optimize the product structure, improve the friction force between the hydraulic bag 202 and the fixed rope 1 and prevent the hydraulic bag 202 from being damaged, the ring body 201 is a circular ring-shaped shell, and the hydraulic bag 202 is communicated in the ring body 201 in a sealing way; a plurality of friction plates 203 are arranged on the inner side of the circumference of the hydraulic bag 202 in an array mode, and the friction plates 203 are in a circular ring shape corresponding to the fixed rope 1.
In order to improve the sensitivity and the reliability of protection, be provided with overhead tank 4 between hydraulic pump 3 and the hydraulic bag 202, the play liquid end of hydraulic pump 3 communicates to overhead tank 4, overhead tank 4 communicates to each hydraulic bag 202, be provided with first check valve between hydraulic pump 3 and the overhead tank 4, the circulation direction of first check valve is the direction that hydraulic pump 3 flows to overhead tank 4, all be provided with second check valve and feed liquor solenoid valve between overhead tank 4 and each hydraulic bag 202, the circulation direction of second check valve is the direction that overhead tank 4 flows to hydraulic bag 202, the feed liquor solenoid valve is connected with acceleration sensor, overhead tank 4 is provided with the manometer, the manometer monitors pressure in overhead tank 4 in real time, when insufficient pressure, hydraulic pump 3 starts, pressurize in overhead tank 4, ensure the reliability.
In order to facilitate the locking state of control position circle 2, the constructor of being convenient for removes, in this embodiment, the protective equipment that falls still is provided with pressure release jar 5, pressure release jar 5 communicates to each hydraulic bag 202, pressure release jar 5 communicates to the feed liquor end of hydraulic pump 3, be provided with out the liquid solenoid valve between pressure release jar 5 and each hydraulic bag 202, position circle 2 is provided with distance sensor, distance sensor is used for measuring the distance value between two adjacent position circles 2, distance sensor and play liquid solenoid valve and feed liquor solenoid valve are connected.
In order to further ensure the anti-falling effect, the falling protection device further comprises an anti-falling net assembly, the anti-falling net assembly is arranged on the lower portion of the outer side of the wall body, the protective net 8 comprises a translation arm, an expansion arm 6, an expansion block 7 and a protective net 8, the two translation arms are arranged at intervals in parallel and are perpendicular to the wall body, the end portion of each translation arm is fixedly connected with the wall body, the two expansion arms 6 are arranged on the two translation arms in a sliding mode along the length direction of the translation arm respectively, the expansion blocks 7 of the plurality of expansion blocks are arranged on the expansion arms 6 in a sliding mode along the length direction of the expansion arms 6, and the expansion blocks 7 arranged on the two expansion arms 6.
In order to optimize the product structure and ensure that the protection net 8 can be reliably opened, the middle part of the unfolding arm 6 is transversely and fixedly provided with a sliding rail 9, the two ends of the unfolding arm 6 are respectively and rotatably provided with belt wheels 10, the two belt wheels 10 are in transmission connection through a belt 11, and the sliding rail 9 is positioned in a space surrounded by the belt 11.
The unfolding block 7 comprises an end block 701 and a middle block 702, the middle blocks 702 are transversely arranged in an array mode, the two end blocks 701 are respectively located at two ends of the middle blocks 702, the end block 701 and the middle block 702 are both arranged on the sliding rail 9 in a sliding mode, the two end blocks 701 are respectively fixedly connected with a belt 11 located on the upper side and a belt 11 located on the lower side, the number of the middle blocks 702 is even, the side surfaces of the end blocks 701 are hinged with two short connecting rods 12, the side surfaces of the middle blocks 702 are hinged with two long connecting rods 13, the end portions of the short connecting rods 12 are hinged with the end blocks 701, the other ends of the short connecting rods are hinged with the end portions of long connecting rods 13 of the middle blocks 702 adjacent to the end blocks 701, the middle portions of the long connecting rods 13 are hinged with the middle blocks 702, and two ends of the long connecting rods;
the middle part of the unfolding arm 6 is fixedly provided with a vertical guide rail 14, and the hinged part of the long connecting rods 13 of the two middle blocks 702 positioned in the middle part is longitudinally arranged on the guide rail 14 in a sliding way.
In order to reduce the counter impact force when a constructor falls to the protection net 8, the upper end of the expansion block 7 is provided with a hydraulic support rod 15, the hydraulic support rod 15 is vertically arranged, the fixed end of the hydraulic support rod 15 is fixedly embedded in the expansion block 7, and the telescopic end of the hydraulic support rod 15 extends upwards and is fixedly connected with the protection net 8.
The anti-falling net assemblies are longitudinally arranged, collect relevant data such as speed, space and motion in real time through sensors such as infrared rays, image recognition and speed, perform systematic logic processing and mathematical operation by using an automatic control program, recognize whether a high-altitude constructor crosses a protection area or monitor whether the constructor falls off from the high altitude outside the high building or not by using technologies such as infrared signal detection, camera image recognition and the like, and further control the state and the number of the triggered anti-falling net assemblies according to the speed and the size of the constructor obtained by the speed sensor, so that the alarming of the high-altitude constructor and the protection of the falling constructor are realized. The number and the bearing force of the protection net 8 can be realized according to the speed of falling constructors; and the analog signal and the digital signal of the image recognition are converted, so that the controller can rapidly process the falling object image data, recognize falling constructors and trigger a protection mechanism.
Taking the example that two positioning rings 2 are arranged on the fixed rope 1 as an example, during normal construction, a constructor is connected with the positioning ring 2 at the upper end of the fixed rope 1 through a rope, initially, liquid is injected into the hydraulic bag 202 of the lower positioning ring 2 and is locked with the fixed rope 1, and the hydraulic bag 202 of the upper positioning ring 2 is in a loose state and can slide along the fixed rope 1. When a constructor moves upwards, the upper positioning ring 2 moves upwards along with the constructor, when the distance sensor judges that the distance value between the two positioning rings 2 reaches a certain numerical value, the liquid inlet electromagnetic valve between the upper positioning ring 2 and the pressure tank 4 is opened, the upper positioning ring 2 and the fixed rope 1 are locked, the liquid inlet electromagnetic valve between the lower positioning ring 2 and the pressure tank 4 is closed, the liquid outlet electromagnetic valve between the lower positioning ring 2 and the pressure relief tank 5 is opened, the lower positioning ring 2 is in a loose state, and the elastic cable between the two positioning rings 2 pulls up the lower positioning ring 2; when the distance of two position circle 2 is less than certain numerical value, the position circle 2 of below is in the locking state, and the position circle 2 that the top was right is in the lax state to this circulation makes things convenient for the constructor to remove, and falls protective equipment and all is in the guard mode when removing.
When the constructor falls, the acceleration sensor sends signals to the liquid inlet electromagnetic valves and the liquid outlet electromagnetic valves, all the liquid inlet electromagnetic valves are in an open state, all the liquid outlet electromagnetic valves are in a closed state, all the positioning rings 2 on the fixed rope 1 are in a locked state, and at the moment, each positioning ring 2 has certain friction force with the fixed rope 1. Constructor's tenesmus power drives 2 locating ring 2 of the top and slowly moves down, offsets a part of impact force, when reaching second locating ring 2, and frictional force superposes, and constructor's tenesmus speed reduces, further offsets the impact force, and a plurality of locating ring 2 plays a role in proper order, can bear constructor's weight until frictional force, makes constructor stop the tenesmus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A falling protection device based on an induction sensor is arranged on the outer side of a wall body and is characterized by comprising a fixed rope (1) and a plurality of positioning rings (2), wherein the fixed rope (1) is longitudinally arranged, the lower end of the fixed rope (1) is fixedly arranged on the ground on the outer side of the wall body, the upper end of the fixed rope (1) is fixedly arranged on the upper end of the outer side of the wall body, the positioning rings (2) are slidably sleeved on the fixed rope (1), two adjacent positioning rings (2) are connected through an elastic inhaul cable, each positioning ring (2) comprises a ring body (201) and a hydraulic bag (202), the ring bodies (201) and the hydraulic bags (202) are both in a circular ring shape, the outer side of the circumference of each hydraulic bag (202) is fixedly arranged on the inner side of the ring body (201), the inner side of the circumference of each hydraulic bag (202) is attached to the outer side of the fixed rope (1), and the hydraulic bags (202) are communicated to a hydraulic, the ring body (201) is fixedly connected to a constructor through a rope, and the constructor wears an acceleration sensor.
2. A fall protection device based on an inductive sensor according to claim 1, characterized in that the ring body (201) is a circular ring shaped housing, the hydraulic bladder (202) is sealed into the ring body (201); and/or a plurality of friction plates (203) are arranged on the inner side of the circumference of the hydraulic bag (202) in an array mode, and the friction plates (203) are in a circular ring shape corresponding to the fixed rope (1).
3. The falling protection device based on the induction sensor is characterized in that a pressure tank (4) is arranged between the hydraulic pump (3) and the hydraulic bags (202), the liquid outlet end of the hydraulic pump (3) is communicated to the pressure tank (4), the pressure tank (4) is communicated to each hydraulic bag (202), a first one-way valve is arranged between the hydraulic pump (3) and the pressure tank (4), the flowing direction of the first one-way valve is the direction of the hydraulic pump (3) flowing to the pressure tank (4), a second one-way valve and a liquid inlet electromagnetic valve are arranged between the pressure tank (4) and each hydraulic bag (202), the flowing direction of the second one-way valve is the direction of the hydraulic tank (4) flowing to the hydraulic bags (202), and the liquid inlet electromagnetic valve is connected with the acceleration sensor.
4. A fall protection arrangement based on an inductive sensor according to claim 3, characterized in that it is further provided with a pressure relief tank (5), which pressure relief tank (5) is connected to each hydraulic capsule (202), which pressure relief tank (5) is connected to the inlet side of the hydraulic pump (3), and an outlet solenoid valve is arranged between the pressure relief tank (5) and each hydraulic capsule (202).
5. A fall protection device based on an induction sensor according to claim 4, characterized in that the location rings (2) are provided with distance sensors for measuring the distance between two adjacent location rings (2), the distance sensors being connected to the liquid outlet solenoid valve and the liquid inlet solenoid valve.
6. The falling protection device based on the induction sensor is characterized in that the falling protection device further comprises a falling protection net component, the falling protection net component is arranged at the lower part of the outer side of the wall body, the protection net (8) comprises translation arms, unfolding arms (6), unfolding blocks (7) and the protection net (8), the translation arms are arranged at intervals in parallel and are perpendicular to the wall body, the end parts of the translation arms are fixedly connected with the wall body, the unfolding arms (6) are respectively arranged on the two translation arms in a sliding mode along the length direction of the translation arms, the unfolding blocks (7) are arranged on the unfolding arms (6) in a sliding mode along the length direction of the unfolding arms (6), and the two sides of the protection net (8) are respectively fixedly arranged on the unfolding blocks (7) on the two unfolding arms (6).
7. A falling protection device based on an induction sensor according to claim 6, characterized in that a sliding rail (9) is transversely and fixedly arranged in the middle of the unfolding arm (6), belt wheels (10) are rotatably arranged at both ends of the unfolding arm (6), the two belt wheels (10) are in transmission connection through a belt (11), and the sliding rail (9) is arranged in a space enclosed by the belt (11).
8. A fall protection device according to claim 7, wherein said deployment block (7) comprises an end block (701) and a middle block (702), a plurality of middle blocks (702) are arranged in a transverse array, two of said end blocks (701) are respectively located at two ends of a plurality of middle blocks (702), both end blocks (701) and middle blocks (702) are slidably arranged on the slide rail (9), and two of said end blocks (701) are respectively fixedly connected with the belt (11) located at the upper side and the belt (11) located at the lower side.
9. A fall protection arrangement based on an inductive sensor according to claim 8, characterized in that the number of middle blocks (702) is even, that the sides of the end blocks (701) are hinged with two short links (12), that the sides of the middle blocks (702) are hinged with two long links (13), that the ends of the short links (12) are hinged with the end blocks (701), that the other ends are hinged with the ends of the long links (13) of the middle blocks (702) adjacent to the end blocks (701), that the middle of the long links (13) are hinged with the middle blocks (702), and that the two ends of the long links (13) are hinged with the ends of the short links (12) or long links (13) of the adjacent middle blocks (702) or end blocks (701), respectively;
the middle part of the unfolding arm (6) is fixedly provided with a vertical guide rail (14), and the hinged part of the long connecting rods (13) of the two middle blocks (702) positioned in the middle part is longitudinally arranged on the guide rail (14) in a sliding manner.
10. The falling protection device based on the induction sensor is characterized in that a hydraulic support rod (15) is arranged at the upper end of the unfolding block (7), the hydraulic support rod (15) is vertically arranged, the fixed end of the hydraulic support rod (15) is fixedly embedded in the unfolding block (7), and the telescopic end of the hydraulic support rod (15) extends upwards and is fixedly connected with the protection net (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011475407.1A CN112681781A (en) | 2020-12-15 | 2020-12-15 | Falling protection equipment based on induction sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011475407.1A CN112681781A (en) | 2020-12-15 | 2020-12-15 | Falling protection equipment based on induction sensor |
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| CN112681781A true CN112681781A (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011475407.1A Pending CN112681781A (en) | 2020-12-15 | 2020-12-15 | Falling protection equipment based on induction sensor |
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| CN (1) | CN112681781A (en) |
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Application publication date: 20210420 |