CN113513234A - Opening and closing power-assisted mechanism of fireproof door - Google Patents
Opening and closing power-assisted mechanism of fireproof door Download PDFInfo
- Publication number
- CN113513234A CN113513234A CN202110332274.0A CN202110332274A CN113513234A CN 113513234 A CN113513234 A CN 113513234A CN 202110332274 A CN202110332274 A CN 202110332274A CN 113513234 A CN113513234 A CN 113513234A
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- Prior art keywords
- door body
- door
- cavity
- liquid storage
- fireproof door
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- 230000007246 mechanism Effects 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 238000001704 evaporation Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 20
- 230000000694 effects Effects 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 24
- 238000007664 blowing Methods 0.000 abstract description 18
- 230000008020 evaporation Effects 0.000 abstract description 15
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 239000011550 stock solution Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 241000221535 Pucciniales Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/72—Power-operated mechanisms for wings with automatic actuation responsive to emergency conditions, e.g. fire
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/50—Power-operated mechanisms for wings using fluid-pressure actuators
- E05F15/53—Power-operated mechanisms for wings using fluid-pressure actuators for swinging wings
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
- E06B5/16—Fireproof doors or similar closures; Adaptations of fixed constructions therefor
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B7/00—Special arrangements or measures in connection with doors or windows
- E06B7/28—Other arrangements on doors or windows, e.g. door-plates, windows adapted to carry plants, hooks for window cleaners
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
- E05Y2900/13—Type of wing
- E05Y2900/132—Doors
- E05Y2900/134—Fire doors
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Special Wing (AREA)
Abstract
The invention relates to the technical field of fire fighting and discloses a starting and stopping power-assisted mechanism of a fireproof door, which comprises a door body, wherein handles are movably arranged on two sides of the door body, a liquid storage cavity is formed in the lower end of the inner cavity of the door body, an evaporation liquid is filled in the inner cavity of the liquid storage cavity, and a rectangular movable cavity is formed in the outer side of the inner cavity of the door body. According to the invention, through the arrangement of the self-closing assistance mechanism, when a fire disaster occurs, the fireproof door is automatically closed under the action of the fireproof door closer, and the hinge of the fireproof door is rusted or the door body is resisted by foreign matters, so that when the fireproof door cannot be automatically closed, the evaporation liquid in the liquid storage cavity is quickly vaporized under the action of higher temperature on the fire scene, and flows into the movable cavity through the liquid through groove, the gas filling in the movable cavity is gradually increased, the impact force of the gas blown out from the air blowing hole is gradually increased, the force generated when the door body is closed is gradually increased under the action of the gas reaction force, and the fireproof door is closed by overcoming the resistance generated abnormally.
Description
Technical Field
The invention relates to the technical field of fire fighting, in particular to an opening and closing power-assisted mechanism of a fireproof door.
Background
The fireproof door is a door which can meet the requirements of fire-resistant stability, integrity and heat insulation within a certain time, and is a fireproof partition with certain fire resistance arranged in a fireproof partition room, an evacuation staircase, a vertical shaft and the like.
When the traditional normally open type fireproof door is used, the traditional normally open type fireproof door is usually matched with a fireproof door closer to be used synchronously, so that the effect of automatically closing the door when encountering a fire is achieved, but in some places, the fireproof door cannot be automatically closed when the fire happens due to the fact that the hinge is rusted or foreign matters are blocked when the fireproof door closer is opened for a long time, so that the required force for closing the fireproof door by the fireproof door closer is increased, the fireproof efficiency of the fireproof door is influenced, and the door closer is used for closing the fireproof door, so that the door can be opened only by large force when the fireproof door is opened from the inside, children or old people with small strength cannot escape quickly, and when fire fighters enter a fire scene to rescue, due to the fact that the temperature of the fire scene is high, the internal energy is accumulated more, and when the door is opened, internal flames can rush outwards quickly, thereby affecting the life safety of the fire fighters.
Disclosure of Invention
Aiming at the defects of the existing fireproof door in the use process in the background technology, the invention provides the opening and closing power-assisted mechanism of the fireproof door, which has the advantages of opening and closing power assistance and fireproof gushing, and solves the technical problems in the background technology.
The invention provides the following technical scheme: the utility model provides a fire door open and close assist drive device, includes the door body, the both sides movable mounting of the door body has the handle, the stock solution chamber has been seted up to the lower extreme of door body inner chamber, and the inner chamber packing in stock solution chamber has the evaporating liquid, the outside of door body inner chamber has been seted up and has been rectangular activity chamber, the middle part in activity chamber and the upper end in stock solution chamber are through leading to the liquid groove intercommunication, the gas blow hole with external and activity intracavity chamber intercommunication is seted up in the outside of the door body, and the aperture in gas blow hole is less.
Preferably, the fly leaf has been cup jointed in the left side activity in activity chamber, the right side fixedly connected with of fly leaf seals the board, and seals the board and be crisscross form fixed connection in the front and back of fly leaf, the middle part fixedly connected with ratchet plate of fly leaf, the middle part movable mounting of activity chamber inner chamber has the gear of being connected with the ratchet plate transmission, and the outside of gear and the inner fixed connection of inboard handle, the gas blow hole of symmetry is all seted up to the front and back of the door body, and seals the board and seal the gear dislocation in the outside.
Preferably, the right side activity of the door body inner chamber is cup jointed and is sealed the piece, and seals the right side of the right side extension department door body of piece, the middle part of sealing the piece and the inner chamber of the door body pass through spring swing joint, the outside swing joint of gear has the turning block, and the outside of turning block and the handle fixed connection in the outside.
The invention has the following beneficial effects:
1. according to the invention, through the arrangement of the self-closing assistance mechanism, when a fire disaster occurs, the fireproof door is automatically closed under the action of the fireproof door closer, and the hinge of the fireproof door is rusted or the door body is resisted by foreign matters, so that when the fireproof door cannot be automatically closed, the evaporation liquid in the liquid storage cavity is quickly vaporized under the action of higher temperature on the fire scene, and flows into the movable cavity through the liquid through groove, the gas filling in the movable cavity is gradually increased, the impact force of the gas blown out from the air blowing hole is gradually increased, the force generated when the door body is closed is gradually increased under the action of the gas reaction force, and the fireproof door is closed by overcoming the resistance generated abnormally.
2. According to the invention, the opening assisting mechanism is arranged, so that when a fire disaster happens and the fireproof door is closed, the gear synchronously rotates by rotating the inner side handle under the action of fixedly connecting the inner side handle and the gear, the movable plate moves upwards under the action of the ratchet plate, the air blowing holes on the inner side of the door body are closed under the action of the sealing plate arranged on the side surface of the movable plate in a staggered manner, the air blowing holes on the outer side are opened, and the required force for opening the door body is reduced under the action of outwards discharging vaporized evaporation liquid in the movable cavity.
3. According to the invention, the fireproof gushing mechanism is arranged, so that when a rescuer opens the fireproof door from the outer side and rotates the outer handle, the gear is movably connected with the gear through the rotating block, the gear cannot rotate, the movable plate is always positioned at the lowest end of the movable cavity after the door body is pushed away, and the vaporized evaporation liquid in the liquid storage cavity can continuously flow into the movable cavity and blow outwards through the inner side air blowing hole under the action of automatic resetting of the sealing block by the spring, so that the flame is cooled under the action of collision of blown gas and flame, and the gushing of the flame is prevented.
Drawings
FIG. 1 is a schematic cross-sectional view of the structure of the present invention;
FIG. 2 is a schematic side cross-sectional view of the inventive structure;
FIG. 3 is an enlarged view of the point A in FIG. 1;
FIG. 4 is an enlarged view of the point B in FIG. 2.
In the figure: 1. a door body; 2. a handle; 3. a liquid storage cavity; 4. a liquid introducing groove; 5. a movable cavity; 6. a movable plate; 7. a gas blowing hole; 8. a sealing plate; 9. a gear; 10. a ratchet plate; 11. rotating the block; 12. a spring; 13. and (7) sealing the block.
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, a power assisting mechanism for opening and closing a fire door comprises a door body 1, wherein handles 2 are movably mounted on two sides of the door body 1, a liquid storage cavity 3 is formed in the lower end of an inner cavity of the door body 1, an evaporation liquid is filled in the inner cavity of the liquid storage cavity 3, a rectangular movable cavity 5 is formed in the outer side of the inner cavity of the door body 1, the middle of the movable cavity 5 is communicated with the upper end of the liquid storage cavity 3 through a liquid passing groove 4, an air blowing hole 7 for communicating the outside with the inner cavity of the movable cavity 5 is formed in the outer side of the door body 1, the aperture of the air blowing hole 7 is small, when a fire occurs, the evaporation liquid in the liquid storage cavity 3 is heated and vaporized, and flows into the movable cavity 5 through the liquid passing groove 4, and is slowly discharged outwards from the movable cavity 5 through the air blowing hole 7, under the action of a reaction force, the door body 1 is subjected to increase the force for closing the door, and the pressure in the movable cavity 5 is gradually increased under the action of the smaller aperture of the air blowing hole 7, and then make the gas impact force of gas outgoing from the gas hole 7 to the outside strengthen, thus make it is the constantly reducing to close the door body 1 to be the required power, until the door closer can overcome the foreign matter or the hinge rusts the resistance that produces closes the door body 1, avoided because the power of door closer is not enough, make when taking place the conflagration, the problem that the door body 1 can't be closed fast.
Wherein, the movable plate 6 is movably sleeved on the left side of the movable cavity 5, the right side of the movable plate 6 is fixedly connected with the sealing plate 8, the sealing plate 8 is fixedly connected in a staggered manner in the front and back of the movable plate 6, the ratchet plate 10 is fixedly connected in the middle of the movable plate 6, the gear 9 in transmission connection with the ratchet plate 10 is movably installed in the middle of the inner cavity of the movable cavity 5, the outer side of the gear 9 is fixedly connected with the inner end of the inner side handle 2, symmetrical air blowing holes 7 are respectively formed in the front and back surfaces of the door body 1, the gear 9 on the outer side is sealed in a staggered manner by the sealing plate 8, the inner side handle 2 of the door body 1 is fixedly connected with the gear 9, after the inner side handle 2 of the door body 1 is rotated, the movable plate 6 is moved upwards under the transmission connection effect of the gear 9 and the ratchet plate 10, and under the effect of the staggered connection between the sealing plate 8 and the right side of the movable plate 6, the sealing plate 8 is used for sealing plate 8 for sealing the inner side air blowing holes 7 of the door body 1, and the air blowing hole 7 on the outer side of the door body 1 is opened, so that the direction of the vaporized evaporation liquid discharged outwards is changed, the force required for opening the door body 1 by overcoming the thrust of the door closer is reduced, and the situation that children or old people with small strength cannot open the fire door in the case of fire is avoided.
Wherein, the right side of the inner cavity of the door body 1 is movably sleeved with a sealing block 13, the right side of the door body 1 is extended from the right side of the sealing block 13, the middle part of the sealing block 13 is movably connected with the inner cavity of the door body 1 through a spring 12, the outer side of the gear 9 is movably connected with a rotating block 11, the outer side of the rotating block 11 is fixedly connected with the handle 2 at the outer side, through the arrangement of the rotating block 11 movably connected with the gear 9, the fire enters the fire scene from the outer side of the door body 1, when the handle 2 is rotated, the gear 9 does not rotate synchronously, thereby ensuring that the movable plate 6 does not move upwards, after the door body 1 is pushed open, the spraying direction of the vaporized evaporation liquid is sprayed towards the inner side of the door body 1, under the action that the sprayed evaporation liquid collides with flame gushing out from the door body 1, the damage of the flame to a human body is reduced, and the flame can be cooled through the evaporation liquid, so that the damage to the human body is further reduced.
Wherein, through setting up the seal piece 13 for when the door body 1 is closed, overcome spring 12 elasticity at the door frame with seal piece 13 and inwards push up the effect down, make seal piece 13 seal stock solution chamber 3, thereby ensured when the door body 1 is closed, the evaporation liquid that vaporizes in the stock solution chamber 3 can not outwards spill over, thereby ensured the availability factor of evaporation liquid in the stock solution chamber 3.
The using method of the invention is as follows: the door body 1 is arranged at a required position, the right side of the door body 1 is movably connected with a door frame through a hinge, the inner side of the door body 1 faces the bottom end of a fire disaster easily occurring, and the outer side faces a stair or a channel;
self-closing boosting: when a fire disaster happens, the fireproof door closer senses that the temperature is abnormally increased, the door body 1 is automatically closed, but the door body 1 cannot be normally closed due to rusting of a hinge or blocking of an external force, evaporated liquid in the liquid storage cavity 3 is quickly vaporized under high-temperature operation, flows into the movable cavity 5 through the liquid through groove 4, and is blown out from the inner side air blowing hole 7 which is sealed in a staggered mode, so that the door body 1 is gradually closed under the action of a reaction force, most of gas cannot be quickly discharged under the action of small aperture of the air blowing hole 7, the pressure in the movable cavity 5 is gradually increased under the action of continuous increase of the evaporated liquid in the movable cavity 5, the impact force of the gas blown out from the air blowing hole 7 is increased, the continuous force required for closing the door body 1 is reduced, and the door body 1 can be closed under the action of the door closer, after the door body 1 is closed, the door frame pushes the sealing block 13 inwards, so that the sealing block 13 overcomes the elastic force of the spring 12 to move, and the opening of the liquid storage cavity 3 is sealed in a staggered manner;
starting the assisting power: when a fire disaster occurs and people such as old people or children with small internal force in the fire scene need to escape outwards, the opening of the liquid storage cavity 3 is opened by rotating the inner side handle 2 and pulling the door body 1 outwards by a moving angle, so that vaporized evaporation liquid in the liquid storage cavity continuously flows into the movable cavity 5, the movable plate 6 is driven to move upwards by the ratchet plate 10 in transmission connection under the action of the handle 2 driving the gear 9 to rotate, the inner side air blowing holes 7 are sealed in a staggered manner by the sealing plate 8 in staggered connection, the outer side air blowing holes 7 are opened, the vaporized evaporation liquid is discharged towards the outer side of the door, and under the action of continuously increasing impact force, the required force for overcoming the door closer to open the door body 1 is reduced, so that the door body 1 can be quickly opened;
fire prevention gushes out: when the rescue personnel got into the scene of a fire and rescues, rotate outside handle 2, under turning block 11 and ratchet plate 10 swing joint's effect, make ratchet plate 10 can not rotate in step, make fly leaf 6 can not the rebound, thereby make pushing open a door body 1 after, seal piece 13 and make the interior evaporating liquid of stock solution chamber 3 gush into movable chamber 5 under the effect of spring 12 automatic re-setting, and to the inboard blowout of the door body 1, thereby make inside pressure great, the flame that leads to gushing out to door body 1 department is by reverse rush-back, cool down flame simultaneously, prevent the burn rescue personnel.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
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 (3)
1. The utility model provides a prevent fire door open and close assist drive device, includes a body (1), the both sides movable mounting of a body (1) has handle (2), its characterized in that: liquid storage cavity (3) have been seted up to the lower extreme of door body (1) inner chamber, and the inner chamber packing in liquid storage cavity (3) has the evaporating liquid, rectangular activity chamber (5) have been seted up in the outside of door body (1) inner chamber, the middle part in activity chamber (5) and the upper end in liquid storage cavity (3) are through leading to cistern (4) intercommunication, gas hole (7) with external and activity chamber (5) inner chamber intercommunication are seted up in the outside of door body (1), and the aperture of gas hole (7) is less.
2. The opening and closing assist mechanism of the fire door according to claim 1, characterized in that: fly leaf (6) have been cup jointed in the left side activity of activity chamber (5), the right side fixedly connected with of fly leaf (6) seals board (8), and seals board (8) and be crisscross form fixed connection in the front and back of fly leaf (6), the middle part fixedly connected with ratchet board (10) of fly leaf (6), the middle part movable mounting of activity chamber (5) inner chamber has gear (9) of being connected with ratchet board (10) transmission, and the outside of gear (9) and the inner fixed connection of inboard handle (2), the blow hole (7) of symmetry are all seted up to the front and back of the door body (1), and seal board (8) and sealed with the gear (9) dislocation in the outside.
3. The opening and closing assist mechanism of the fire door according to claim 1, characterized in that: the right side activity of the inner chamber of the door body (1) is sleeved with a sealing block (13), the right side of the right side extending part of the door body (1) of the sealing block (13) is connected with the inner chamber of the door body (1) through a spring (12) in a movable mode, the outer side of the gear (9) is movably connected with a rotating block (11), and the outer side of the rotating block (11) is fixedly connected with a handle (2) on the outer side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110332274.0A CN113513234A (en) | 2021-03-29 | 2021-03-29 | Opening and closing power-assisted mechanism of fireproof door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110332274.0A CN113513234A (en) | 2021-03-29 | 2021-03-29 | Opening and closing power-assisted mechanism of fireproof door |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113513234A true CN113513234A (en) | 2021-10-19 |
Family
ID=78062157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110332274.0A Withdrawn CN113513234A (en) | 2021-03-29 | 2021-03-29 | Opening and closing power-assisted mechanism of fireproof door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113513234A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208650767U (en) * | 2018-07-13 | 2019-03-26 | 广东坤泰科技有限公司 | A kind of fire resistant doorsets of effective barrier intensity of a fire |
| CN209874953U (en) * | 2019-01-30 | 2019-12-31 | 青岛牧城门业集团有限公司 | Fire-fighting fireproof door |
| CN112096254A (en) * | 2020-10-23 | 2020-12-18 | 温州优帅家具有限公司 | Power-assisted fireproof door suitable for fire fighting access |
| CN112263795A (en) * | 2020-10-16 | 2021-01-26 | 喻贞烈 | Automatic smoke suction device for pushing door of fire-fighting fireproof door |
-
2021
- 2021-03-29 CN CN202110332274.0A patent/CN113513234A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208650767U (en) * | 2018-07-13 | 2019-03-26 | 广东坤泰科技有限公司 | A kind of fire resistant doorsets of effective barrier intensity of a fire |
| CN209874953U (en) * | 2019-01-30 | 2019-12-31 | 青岛牧城门业集团有限公司 | Fire-fighting fireproof door |
| CN112263795A (en) * | 2020-10-16 | 2021-01-26 | 喻贞烈 | Automatic smoke suction device for pushing door of fire-fighting fireproof door |
| CN112096254A (en) * | 2020-10-23 | 2020-12-18 | 温州优帅家具有限公司 | Power-assisted fireproof door suitable for fire fighting access |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20211019 |
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| WW01 | Invention patent application withdrawn after publication |