CN109393808A - The elastics wing seat of adjustable back angle - Google Patents
The elastics wing seat of adjustable back angle Download PDFInfo
- Publication number
- CN109393808A CN109393808A CN201811608595.3A CN201811608595A CN109393808A CN 109393808 A CN109393808 A CN 109393808A CN 201811608595 A CN201811608595 A CN 201811608595A CN 109393808 A CN109393808 A CN 109393808A
- Authority
- CN
- China
- Prior art keywords
- steel plate
- spring steel
- backrest
- fixing piece
- angle
- 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
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
- A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
- A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
- A47C7/462—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs adjustable by mechanical means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
The present invention relates to a kind of elastics wing seats of adjustable back angle, including spring steel plate, backrest, foot prop, backer board is provided in the backrest, at least one spring steel plate is fixed on the back of backer board, at least one locating part being fixedly connected on spring steel plate is arranged in the lower section of the backer board, at least one backrest angle regulating mechanism links together the spring steel plate lower end with foot prop column, and the adjusting of backrest angle is realized by backrest angle regulating mechanism.The elastics wing of the chair back may be implemented by the way that spring steel plate is arranged at the backer board of backrest in the present invention；And backrest angle regulating mechanism is set between spring steel plate and foot prop column, any adjusting of the oblique angular position of backrest may be implemented by backrest angle regulating mechanism, so that backrest is located in angle position adjusted, and can be swung on the position.In addition, the elastics wing armchair structure is simple, it is easy for installation.
Description
Technical field
The present invention relates to a kind of seats, and in particular to a kind of backrest elastics wing seat.
Background technique
In order to improve the comfort level of seat, the chair back in seat be usually disposed as can elastics wing form.Currently used for
In public place the chair back can in elastics wing seat backrest elastics wing device be typically all by back connecting plate, pressing plate, spring steel,
The parts such as lower connecting plate and bolt, nut, gasket for connecting these parts are constituted, and structure is comparatively laborious, peace
Fill relatively cumbersome, and production cost is relatively high, and performance is relatively unstable.In order to solve the problems existing in the prior art, patent announcement
Number CN208064895U, discloses a kind of backrest elastics wing device, backer board is provided in the chair back, backer board rear is set
It is equipped with spring steel plate, finite place piece is set below backer board, locating part is fixed on spring steel plate, and the upper end of spring steel plate is fixed
Onto the backing plate, the lower end of spring steel plate is fixed on foot prop.Short axle is provided with below backer board, locating part is provided with circle
Hole, short axle move in circular hole.The locating part is fixed on spring steel plate, and short axle is quiet relative to spring steel plate and backer board
Only, that is to say, that short axle can only be fixed on foot prop, and by the circular hole on locating part and the limit between short axle, the chair back can only
It is swung in the limit.In addition, placed restrictions on since spring steel plate lower end is fixed with foot prop by spring steel plate deformation, it can not be real
Existing backrest angle is more than the adjusting of spring steel plate deformation, and therefore, this kind of backrest elastics wing device is only applicable to by backwards
Rear-inclined angle is definite value, swings backward certain angle in the basis of valuation.And it cannot be used for backrest and tilt backwards angle need
It adjusts, and swings backward the elastics wing seat of certain angle on the basis of the adjusting angle.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of elastics wing seat of adjustable back angle, the seat
On the basis of backrest tilts backwards angular adjustment, backrest can swing backward certain angle in any adjusting angle, have structure
Simply, performance is stablized, and is applicable in strong feature.
In order to solve the above technical problems, the technical solution adopted by the present invention: a kind of elastics wing seat of adjustable back angle
Chair, including spring steel plate, backrest, foot prop are provided with backer board in the backrest, at least one spring steel plate is fixed on backer board
Back, at least one locating part being fixedly connected on spring steel plate, at least one backrest is arranged in the lower section of the backer board
Angle adjusting mechanism links together the spring steel plate lower end with foot prop column, is leaned on by the realization of backrest angle regulating mechanism
The adjusting of dorsal horn degree.
Further, the locating part is provided with circular hole, and the short axle is inserted into locating part, and is moved in circular hole, is used for
The limit of backrest amplitude of fluctuation.
Further, the spring steel plate is the steel plate of Z-type structure, and the lower part of steel plate of Z-type structure has bending plate, bending plate
The swing of backrest may be implemented.
Further, the backrest angle regulating mechanism is made of spring steel plate fixing piece, limit plate, locking nut, described
Spring steel plate fixing piece one end has a connecting plate, through-hole is provided on connecting plate, after the other end is fixedly connected with limit plate lower part
A cylindrical mesa is extended outward, re-extends out a connecting shaft among cylindrical mesa outward, connecting shaft head has outer spiral shell
Line, the connecting shaft of spring steel plate fixing piece are inserted into the through-hole of the column of foot prop, with lock after the column of end of thread stretching foot prop
Tight nut is axially locked, and connects the cylindrical mesa front end face of spring steel plate fixing piece and the column medial surface of foot prop closely
It connects.
Further, when adjusting angle of backrest, the locking nut is unscrewed, before the cylindrical mesa for making spring steel plate fixing piece
The column medial surface of end face and foot prop unclamps, and backrest is passed through the spring steel plate of backer board back and the company of spring steel plate fixing piece
Spindle is rotated around the through-hole of foot prop column, it can be achieved that backrest angle is arbitrarily adjusted；After the completion of backrest angle adjusting, screw described
The column medial surface of locking nut, the cylindrical mesa front end face and foot prop that make spring steel plate fixing piece closely clings, to make to lean on
Back is located in angle position adjusted, and can be swung on angle position adjusted.
Further, the backrest angle regulating mechanism is by spring steel plate fixing piece, limit plate, end face positioning link, lock
Tight nut composition, spring steel plate fixing piece one end have a connecting plate, and through-hole is provided on connecting plate, and the other end is fixed to be connected
A cylinder concave station is extended outward after connecing limit plate lower part, cylinder concave station re-extends out a connection outward among concave bottom
Axis, connecting shaft head have external screw thread, and the recess end face of cylinder concave station is equipped with end-tooth；The end face positioning link is end
Face gear, face gear centre have a round recessed, have a through-hole among round recessed；The face gear is weldingly fixed on foot
On the column medial surface of frame, the connecting shaft of spring steel plate fixing piece is inserted into the logical of the column of foot prop after the through-hole in face gear
Kong Zhong, the end of thread of connecting shaft is fixed after stretching out the column of foot prop with locking nut axial locking, and makes spring steel plate fixing piece
Cylinder concave station front end face on end-tooth connection is engaged with face gear.
Further, compressed spring is socketed in the connecting shaft of the spring steel plate fixing piece, compressed spring is located at spring steel plate
In the cylinder concave station of fixing piece and the round recessed of face gear, compressed spring both ends are recessed with the cylinder of spring steel plate fixing piece respectively
The concave bottom of platform and the round recessed bottom of face gear connect.
Further, when adjusting angle of backrest, unscrew the locking nut, make spring steel plate fixing piece cylinder concave station and
End-tooth disengages under compressed spring effect with face gear, and backrest is passed through to the spring steel plate and spring steel plate of backer board back
The connecting shaft of fixing piece is rotated around the through-hole of foot prop column, it can be achieved that backrest angle is arbitrarily adjusted；It is completed when backrest angle is adjusted
Afterwards, locking nut is screwed, engages the end-tooth on the cylinder concave station front end face of spring steel plate fixing piece with face gear, thus
So that backrest is located in angle position adjusted, and can be swung on angle position adjusted.
Further, the spring steel plate lower end is solid with bolt, flat shim and nut and spring steel plate fixing piece by pressing plate
Fixed connection.
Further, the adjusting angular range of the backrest is 80-180 degree.
Beneficial effects of the present invention: the elastics wing seat of adjustable back angle of the invention passes through the backing in backrest
Spring steel plate is set at plate, the elastics wing of the chair back may be implemented；And dorsal horn is leaned in setting between spring steel plate and foot prop column
Regulating mechanism is spent, any adjusting of the oblique angular position of backrest may be implemented by backrest angle regulating mechanism, determine backrest
Position can be swung on the position in angle position adjusted.In addition, the elastics wing armchair structure is simple, installation
It is convenient.
Detailed description of the invention
Fig. 1 is the elastics wing armchair structure schematic diagram of adjustable back angle of the invention；
Fig. 2 is the backrest angle regulating mechanism structural schematic diagram implemented in 1；
Fig. 3 is the backrest angle regulating mechanism structural schematic diagram implemented in 2.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of elastics wing seat of adjustable back angle, including spring steel plate 1, backrest 2, foot prop 3 etc..
It is provided with backer board 4 in backrest 2, the back of backer board 4 is fixedly connected with the spring steel plate 1 swung for backrest, under backer board 4
Side's setting finite place piece 5, the locating part 5 are fixedly mounted on spring steel plate 1 by screw 6.1 lower end of spring steel plate passes through backrest
Angle adjusting mechanism 7 is connected on 3 column of foot prop.Short axle 7-1 on locating part 5 and backrest angle regulating mechanism 7, which cooperates, to be limited
Connection.The locating part 5 can further limit the amplitude of backrest swing, avoid 2 amplitude of fluctuation of backrest excessive and lead to backrest 2 not
It can reply, shorten the service life of spring steel plate 1.Spring steel plate 1 is the steel plate of Z-type structure, and 1 lower part of spring steel plate has bending
Plate, bending plate may be implemented the swing of backrest 2, and the amplitude range swung is in the deformation range of bending plate, can be to avoid leaning on
Back amplitude of fluctuation is excessive and causes backrest that can not reply.
In the present embodiment 1, as shown in Fig. 2, backrest angle regulating mechanism 7 is by spring steel plate fixing piece, limit plate 7-2, lock
Tight nut 7-3 composition.Spring steel plate fixing piece one end has a connecting plate 7-4, is provided with through-hole, the other end on connecting plate 7-4
A cylindrical mesa 7-6 is extended outward after being fixedly connected with the lower part limit plate 7-2, is re-extended out outward among cylindrical mesa 7-6
One connecting shaft 7-5, the head connecting shaft 7-5 have external screw thread.Wherein, the top limit plate 7-2 is equipped with short axle 7-1, and short axle 7-1
It protrudes into the circular hole of locating part 5, in the through-hole of the column of the connecting shaft 7-5 insertion foot prop 3 of spring steel plate fixing piece, the end of thread
It is fixed after stretching out the column of foot prop 3 with locking nut 7-3 axial locking, and before making the cylindrical mesa 7-6 of spring steel plate fixing piece
End face is closely connect with the column medial surface of foot prop 3.1 lower end of spring steel plate by pressing plate 8, with bolt, flat shim and nut 9 with
Connecting plate on spring steel plate fixing piece 7-4 is fixedly connected.
When needing adjusting angle of backrest, locking nut 7-3 need to only be unscrewed, make the cylindrical mesa of spring steel plate fixing piece
The column medial surface of 7-6 front end face and foot prop 3 unclamps, and then, backrest can be passed through to the spring steel plate 1 and bullet of 4 back of backer board
Property steel fittings connecting shaft 7-5 around 3 column of foot prop through-hole rotation, it can be achieved that 2 angle of backrest is arbitrarily adjusted, the tune of recommendation
Angle is saved between 80-180 degree, after the completion of backrest angle is adjusted, locking nut 7-3 is screwed, makes the circle of spring steel plate fixing piece
Column platform 7-6 front end face and the column medial surface of foot prop 3 are closely adjacent to, so that backrest 2 is made to be located in angle position adjusted,
And it can be swung on the position.
In the present embodiment 2, as shown in figure 3, backrest angle regulating mechanism 7 is by spring steel plate fixing piece, limit plate 7-2, end
Face positioning link 7-8, locking nut 7-3 composition.Spring steel plate fixing piece one end has a connecting plate 7-4, connecting plate 7-4
On be provided with through-hole, the other end extends outward a cylinder concave station 7-7, cylinder concave station 7-7 after being fixedly connected with the lower part limit plate 7-2
A connecting shaft 7-5 is re-extended out among from concave bottom outward, the head connecting shaft 7-5 has external screw thread, the recess of cylinder concave station 7-7
End face is equipped with end-tooth.End face positioning link 7-8 is face gear, has a round recessed among face gear, and circle is recessed
There is a through-hole among slot.The top limit plate 7-2 is equipped with short axle 7-1, and short axle 7-1 is protruded into the circular hole of locating part 5.When installation,
Face gear is weldingly fixed on the column medial surface of foot prop 3, and the connecting shaft 7-5 of spring steel plate fixing piece is through in face gear
It is inserted into after through-hole in the through-hole of the column of foot prop 3, uses locking nut 7-3 axial locking after the column of end of thread stretching foot prop 3
It is fixed, and the end-tooth on the cylinder concave station 7-7 front end face of spring steel plate fixing piece is made to engage connection with face gear.And bullet
Property steel fittings connecting shaft 7-5 on be socketed compressed spring 7-9, compressed spring 7-9 is located at the cylinder of spring steel plate fixing piece
In the round recessed of concave station 7-7 and face gear, the both ends compressed spring 7-9 respectively with the cylinder concave station 7-7 of spring steel plate fixing piece
Concave bottom and face gear round recessed bottom connect.1 lower end of spring steel plate is by pressing plate 8, with bolt, flat shim and nut
9 are fixedly connected with the connecting plate 7-4 on spring steel plate fixing piece.
When needing adjusting angle of backrest, locking nut 7-3 need to only be unscrewed, make the cylinder concave station of spring steel plate fixing piece
7-7 and face gear disengage under compressed spring 7-9 effect, then, backrest can be passed through to the spring steel plate 1 of 7 back of backer board
Recommend around the through-hole rotation of 3 column of foot prop, it can be achieved that backrest angle is arbitrarily adjusted with the connecting shaft 7-5 of spring steel plate fixing piece
Adjusting angle between 80-180 degree, backrest angle adjust after the completion of, screw locking nut 7-3, make spring steel plate fixing piece
Cylinder concave station 7-7 front end face on end-tooth engaged with face gear, so that backrest be made to be located in angle position adjusted,
And it can be swung on the position.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of elastics wing seat of adjustable back angle, including spring steel plate, backrest, foot prop, it is provided in the backrest
Backer board, at least one spring steel plate are fixed on the back of backer board, at least one company of fixation is arranged in the lower section of the backer board
Connect the locating part on spring steel plate, it is characterised in that: at least one backrest angle regulating mechanism is by the spring steel plate lower end
It links together with foot prop column, the adjusting of backrest angle is realized by backrest angle regulating mechanism.
2. the elastics wing seat of adjustable back angle according to claim 1, it is characterised in that: the locating part is provided with
Circular hole, the short axle is inserted into locating part, and is moved in circular hole, the limit for backrest amplitude of fluctuation.
3. the elastics wing seat of adjustable back angle according to claim 1, it is characterised in that: the spring steel plate is
The lower part of steel plate of the steel plate of Z-type structure, Z-type structure has bending plate, and the swing of backrest may be implemented in bending plate.
4. the elastics wing seat of adjustable back angle according to claim 1, it is characterised in that: the backrest angle tune
Section mechanism is made of spring steel plate fixing piece, limit plate, locking nut, and spring steel plate fixing piece one end has a connection
Plate is provided with through-hole on connecting plate, and the other end extends outward a cylindrical mesa, cylindrical mesa after being fixedly connected with limit plate lower part
Intermediate to re-extend out a connecting shaft outward, connecting shaft head has external screw thread, and the connecting shaft of spring steel plate fixing piece is inserted into foot
In the through-hole of the column of frame, fixed after the column of the end of thread stretching foot prop of connecting shaft with locking nut axial locking, and make bullet
The cylindrical mesa front end face of property steel fittings and the column medial surface of foot prop closely connect.
5. the elastics wing seat of adjustable back angle according to claim 4, it is characterised in that: work as adjusting angle of backrest
When, the locking nut is unscrewed, the column medial surface of the cylindrical mesa front end face and foot prop that make spring steel plate fixing piece unclamps, will
Backrest is rotated by the spring steel plate of backer board back and the connecting shaft of spring steel plate fixing piece around the through-hole of foot prop column, can be real
Existing backrest angle is arbitrarily adjusted；After the completion of backrest angle adjusting, the locking nut is screwed, the circle of spring steel plate fixing piece is made
The column medial surface of column platform front end face and foot prop closely clings, to make backrest be located in angle position adjusted, and can
It is swung on angle position adjusted.
6. the elastics wing seat of adjustable back angle according to claim 1, it is characterised in that: the backrest angle tune
Section mechanism is made of spring steel plate fixing piece, limit plate, end face positioning link, locking nut, the spring steel plate fixing piece
One end has a connecting plate, is provided with through-hole on connecting plate, the other end extends outward one after being fixedly connected with limit plate lower part
Cylinder concave station, cylinder concave station re-extend out a connecting shaft outward among concave bottom, and connecting shaft head has external screw thread, and cylinder is recessed
The recess end face of platform is equipped with end-tooth；The end face positioning link is face gear, has a circle among face gear
Groove has a through-hole among round recessed；The face gear is weldingly fixed on the column medial surface of foot prop, and spring steel plate is fixed
The connecting shaft of part is inserted into the through-hole of the column of foot prop after the through-hole in face gear, and the end of thread of connecting shaft stretches out foot prop
It is fixed after column with locking nut axial locking, and makes the end-tooth and end on the cylinder concave station front end face of spring steel plate fixing piece
Face gear engagement connection.
7. the elastics wing seat of adjustable back angle according to claim 6, it is characterised in that: the spring steel plate is solid
Determine to be socketed compressed spring in the connecting shaft of part, compressed spring is located at the cylinder concave station of spring steel plate fixing piece and the circle of face gear
In groove, round recessed bottom of the compressed spring both ends respectively with the concave bottom of the cylinder concave station of spring steel plate fixing piece and face gear is connect
Touching connection.
8. the elastics wing seat of adjustable back angle according to claim 7, it is characterised in that: work as adjusting angle of backrest
When, the locking nut is unscrewed, disengages the cylinder concave station of spring steel plate fixing piece under compressed spring effect with face gear,
Backrest is rotated by the spring steel plate of backer board back and the connecting shaft of spring steel plate fixing piece around the through-hole of foot prop column, it can
Realize that backrest angle is arbitrarily adjusted；After the completion of backrest angle adjusting, locking nut is screwed, the cylinder of spring steel plate fixing piece is made
End-tooth on concave station front end face is engaged with face gear, to make backrest be located in angle position adjusted, and can be in institute
It is swung on the angle position of adjusting.
9. the elastics wing seat of -8 any adjustable back angles according to claim 1, it is characterised in that: the elasticity
Steel plate lower end is fixedly connected by pressing plate with bolt, flat shim with nut with spring steel plate fixing piece.
10. the elastics wing seat of -8 any adjustable back angles according to claim 1, it is characterised in that: described to lean on
The adjusting angular range of back is 80-180 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811608595.3A CN109393808B (en) | 2018-12-27 | 2018-12-27 | Elastic swinging seat with adjustable backrest angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811608595.3A CN109393808B (en) | 2018-12-27 | 2018-12-27 | Elastic swinging seat with adjustable backrest angle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109393808A true CN109393808A (en) | 2019-03-01 |
| CN109393808B CN109393808B (en) | 2022-03-04 |
Family
ID=65462157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811608595.3A Active CN109393808B (en) | 2018-12-27 | 2018-12-27 | Elastic swinging seat with adjustable backrest angle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109393808B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113768713A (en) * | 2021-08-13 | 2021-12-10 | 赤峰学院附属医院 | Adjustable body position frame for spinal surgery nursing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067430A (en) * | 2001-11-27 | 2007-11-07 | 株式会社索密克石川 | Rotary damper, auto part having rotary damper and rotational motion assistant mechanism |
| CN201577827U (en) * | 2009-08-21 | 2010-09-15 | 唐承慧 | Seat back-rest angle regulating mechanism |
| CN203088264U (en) * | 2012-12-26 | 2013-07-31 | 得丰国际有限公司 | Angle adjusting mechanism for back of chair |
| CN106274563A (en) * | 2016-10-08 | 2017-01-04 | 广州视睿电子科技有限公司 | Seat angle regulator |
| CN106828211A (en) * | 2017-02-21 | 2017-06-13 | 广州视源电子科技股份有限公司 | Seat angle adjusting device |
| CN208064895U (en) * | 2017-07-14 | 2018-11-09 | 上海永乐座椅有限公司 | Backrest elastics wing device |
-
2018
- 2018-12-27 CN CN201811608595.3A patent/CN109393808B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067430A (en) * | 2001-11-27 | 2007-11-07 | 株式会社索密克石川 | Rotary damper, auto part having rotary damper and rotational motion assistant mechanism |
| CN201577827U (en) * | 2009-08-21 | 2010-09-15 | 唐承慧 | Seat back-rest angle regulating mechanism |
| CN203088264U (en) * | 2012-12-26 | 2013-07-31 | 得丰国际有限公司 | Angle adjusting mechanism for back of chair |
| CN106274563A (en) * | 2016-10-08 | 2017-01-04 | 广州视睿电子科技有限公司 | Seat angle regulator |
| CN106828211A (en) * | 2017-02-21 | 2017-06-13 | 广州视源电子科技股份有限公司 | Seat angle adjusting device |
| CN208064895U (en) * | 2017-07-14 | 2018-11-09 | 上海永乐座椅有限公司 | Backrest elastics wing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113768713A (en) * | 2021-08-13 | 2021-12-10 | 赤峰学院附属医院 | Adjustable body position frame for spinal surgery nursing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109393808B (en) | 2022-03-04 |
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