CN107105846B - The folding protective case of electronic equipment - Google Patents
The folding protective case of electronic equipment Download PDFInfo
- Publication number
- CN107105846B CN107105846B CN201480083999.9A CN201480083999A CN107105846B CN 107105846 B CN107105846 B CN 107105846B CN 201480083999 A CN201480083999 A CN 201480083999A CN 107105846 B CN107105846 B CN 107105846B
- Authority
- CN
- China
- Prior art keywords
- protective case
- lower cover
- folding protective
- cover
- elastic sheet
- 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
- A45—HAND OR TRAVELLING ARTICLES
- A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
- A45C11/00—Receptacles for purposes not provided for in groups A45C1/00-A45C9/00
- A45C11/24—Etuis for purposes not covered by a single one of groups A45C11/02 - A45C11/22, A45C11/26, A45C11/32 - A45C11/38
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Battery Mounting, Suspending (AREA)
- Telephone Set Structure (AREA)
Abstract
The invention discloses the folding protective cases of a kind of electronic equipment, which includes: lower cover, for placing electronic equipment；Upper cover can be relatively rotated each other with lower cover and be connect；Contact assembly is folded, is set at upper cover and lower cover rotation connection；Wherein, upper cover includes upper cap body and first reserve battery fixed with upper cap body, folding contact assembly includes the bracket and multiple electroconductive elastic sheets being arranged at intervals on bracket being fixed at rotation connection, and electroconductive elastic sheet includes the lower contact portion be connected with lower cover or electronic equipment and the upper contact part for being connected when upper cover is closed with lower cover with the first reserve battery.
Description
Technical field
The present invention relates to the protective case design field of electronic equipment, the folding more particularly to a kind of electronic equipment is protected
Sheath.
Background technique
As consumer electronic power consumption is increasing, the requirement of the electronic equipments such as mobile phone, ipad is small in size, and screen is big, because
This battery finite volume itself matched cannot achieve built in the battery of larger capacity in the electronic device.Electronic equipment it is spare
Battery, which refers to, can arbitrarily be worn on electronic equipment periphery, and electricity can be transferred to the internal battery of electronic equipment at any time
On.
Most reserve batteries is to design at the back side of electronic equipment at present, and electricity is transferred to in-built electrical by interface
Pond.In order to further increase the capacity of reserve battery, the folding protective case of electronic equipment is made full use of, is being folded inside protective case
Encapsulate the reserve battery of card form.This cell thickness only has about 0.5 millimeter, with fragment closed assembly and can have certain softness
Property, it is very suitable to be encapsulated on the folding protective case of electronic equipment.However, often overturning is needed due to often folding protective case,
Even 360 ° overturnings are bonded, and reserve battery is conducted to lower cover or electronics by winding displacement in the existing upper cover for folding protective case
Equipment, at the rotation connection of upper cover and lower cover, winding displacement is easy to cause the plain conductor in winding displacement to generate gold by bending repeatedly
Belong to fatigue, for example, traditional winding displacement service life, which only has 1.5 ten thousand times, occurs as soon as metal fracture.
Accordingly, it is desirable to provide the folding protective case of a kind of electronic equipment, to solve the above technical problems.
Summary of the invention
The invention mainly solves the technical problem of providing the folding protective cases of a kind of electronic equipment, avoid arranging using metal
Line is connected upper cover and lower cover and promotes the durability of product so as to avoid metal winding displacement from fractureing.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: the folding of a kind of electronic equipment is provided
Protective case, which includes: lower cover, for placing electronic equipment；Upper cover can be relatively rotated each other with lower cover and be connect；
Contact assembly is folded, is set at upper cover and lower cover rotation connection；Wherein, upper cover includes upper cap body and consolidates with upper cap body
The first fixed reserve battery, folding contact assembly includes being fixed on bracket at rotation connection and multiple being arranged at intervals on bracket
On electroconductive elastic sheet, electroconductive elastic sheet includes the lower contact portion be connected with lower cover or electronic equipment and for closing in upper cover and lower cover
When the upper contact part that is connected with the first reserve battery so that when upper cover and lower cover are closed, the first reserve battery and lower cover or electricity
Sub- equipment conducting.
Wherein, folding protective case further includes interconnecting piece, and interconnecting piece and upper cover and lower cover are rotatablely connected.
Wherein, bracket is fixed on lower lid, and folding protective case further includes the multiple and electroconductive elastic sheet being arranged on interconnecting piece
One-to-one upper contact pin, upper contact pin is electrically connected with the first reserve battery, when upper cover and lower cover are closed, upper contact
Pin contacts conducting with the upper contact part of corresponding electroconductive elastic sheet.
Wherein, bracket is fixed on interconnecting piece, and folding protective case further includes the multiple and electroconductive elastic sheet being arranged on upper lid
One-to-one upper contact pin, upper contact pin is electrically connected with the first reserve battery, when upper cover and lower cover are closed, upper contact
Pin contacts conducting with the upper contact part of corresponding electroconductive elastic sheet.
Wherein, folding protective case further includes being arranged between two neighboring upper contact pin and being fixed on more on interconnecting piece
A contact separation piece is provided on bracket and corresponds with contact separation piece and for contacting in electroconductive elastic sheet and upper contact pin
The holding tank of Shi Rongna contact separation piece.
Wherein, the upper contact part of electroconductive elastic sheet includes two shrapnel contacts being bent to form by electroconductive elastic sheet part and connection
Bending section between two shrapnel contacts, two shrapnel contacts are connected when upper cover is closed with lower cover with the first reserve battery.
Wherein, the mounting hole being correspondingly arranged with each electroconductive elastic sheet is provided on bracket, electroconductive elastic sheet is fixed on mounting hole
In, it is fixed in two mounting holes with fixing electroconductive elastic sheet.
Wherein, electroconductive elastic sheet is metal clips, and bracket is plastic material, and bracket is formed by Shooting Technique and in injection molding work
It is fixed during skill with metal clips.
Wherein, folding protective case further includes being arranged on lower lid and the lower contact being arranged in a one-to-one correspondence with electroconductive elastic sheet is drawn
Foot, lower contact pin are contradicted with the lower contact portion elasticity of corresponding electroconductive elastic sheet, and lower cover includes lower cap body and is fixed on lower cover master
Control circuit board on body, lower contact pin are electrically connected with control circuit board, electronic equipment be placed on it is lower cover time control system electricity
Road plate is electrically connected with electronic equipment, and control circuit board is lower than in the electricity of electronic equipment and presets when upper cover and lower cover are closed
When charge value, the first reserve battery of control is that electronic equipment charges or powers.
Wherein, lower cover further includes the second reserve battery being fixed on lower cap body, the second reserve battery and control circuit
Plate electrical connection.
Wherein, the first reserve battery is encapsulated in upper cap body, and the second reserve battery is encapsulated in lower cap body.
Wherein, lower cover further includes the charging interface being set on lower cap body, and charging interface is electrically connected with control circuit board,
Control circuit board charges when charging interface connects external power supply for the first reserve battery and/or the second reserve battery.
Wherein, the width of interconnecting piece and the height of bracket are equal.
Wherein, upper cover, interconnecting piece and lower cover are integrally formed.
The beneficial effects of the present invention are: being in contrast to the prior art, the present invention folds contact assembly by setting, and
Upper cover and lower cover are connected by the electroconductive elastic sheet folded on contact assembly, the electricity of the first reserve battery in upper cover is transferred to electricity
It, can be with so as to the failure for avoiding causing using winding displacement product from being broken after upper and lower covers opening and closing repeatedly in sub- equipment
Promote the durability of product.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the folding protective case of electronic equipment of the invention；
Fig. 2 is the structural schematic diagram of the folding contact assembly of folding protective case of the invention；
Fig. 3 is that the present invention folds the interconnecting piece of protective case, the upper structural schematic diagram for contacting pin, contact separation piece；
Fig. 4 is the structural schematic diagram of electroconductive elastic sheet of the invention；
Fig. 5 is the structural schematic diagram for the lower cover that the present invention folds protective case.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
It is the structural schematic diagram of the folding protective case of electronic equipment of the invention also referring to Fig. 1 and Fig. 2, Fig. 1.Fig. 2
It is the structural schematic diagram of the folding contact assembly of folding protective case of the invention.In the present embodiment, under folding protective case includes
Lid 12, folds contact assembly 13 at upper cover 11.
Lower cover 12 is for placing electronic equipment 10.Upper cover 11 can be relatively rotated each other with lower cover 12 and be connect.Fold contact sets
Part 13 is set at upper cover 11 and 12 rotation connection of lower cover.Upper cover 11 include upper cap body (not indicating) and with upper cap body 11
The first fixed reserve battery (not shown).Folding contact assembly 13 includes being fixed on bracket 131 at rotation connection and more
A electroconductive elastic sheet 132 being arranged at intervals on bracket 131, electroconductive elastic sheet 132 include being connected with lower cover 12 or electronic equipment 10
Lower contact portion (not shown) and upper contact part for being connected when upper cover 11 is closed with lower cover 12 with the first reserve battery (are not marked
Show) so that the first reserve battery and lower cover 12 or electronic equipment 10 are connected when upper cover 11 and lower cover 12 close.
Preferably, folding protective case further includes that interconnecting piece 14, interconnecting piece 14 and upper cover 11 and lower cover 12 are rotatablely connected.It is more excellent
Selection of land, upper cover 11, interconnecting piece 14 and lower cover 12 are integrally formed.Interconnecting piece 14 and 11 junction of upper cover are the folding line of straight line, even
Junction is also the folding line of straight line between socket part 14 and lower cover 12, and interconnecting piece 14 is rotatablely connected with upper cover 11 and lower cover 12, and
Shaft is the folding line of straight line.It is appreciated that in other embodiments, can be arranged by way of others such as shaft interconnecting piece 14 and
Upper cover 11 and lower cover 12 are rotatablely connected, or otherwise directly setting upper cover 11 and relatively turnable connect of lower cover 12 and
No setting is required interconnecting piece 14, rotation are similar to the overturning of page, and when upper cover 11 goes to parallel with lower cover 12, and upper cover 12 is attached to
When 10 upper surface of electronic equipment, to fold the state that protective case closes.
Further regard to Fig. 3 incorporated by reference to Fig. 1 and Fig. 2, Fig. 3 be the present invention fold the interconnecting piece of protective case, upper contact pin,
The structural schematic diagram of contact separation piece.Preferably, bracket 131 is fixed on lower cover 12, and folding protective case further includes setting even
Multiple and electroconductive elastic sheet 132 in socket part 14 above contacts pin 15, upper contact pin 15 and the first reserve battery correspondingly
Electrical connection, when upper cover 11 and lower cover 12 are closed, upper contact pin 15 is contacted with the upper contact part of corresponding electroconductive elastic sheet 132 is led
It is logical.In other embodiments, bracket 131, which can also be, is fixed on interconnecting piece 14, and folding protective case further includes being arranged in upper cover
Upper contact pin 15, upper contact pin 15 are electrically connected multiple and electroconductive elastic sheet on 11 with the first reserve battery correspondingly,
When upper cover and lower cover are closed, upper contact pin 15 contacts conducting with the upper contact part of corresponding electroconductive elastic sheet 132.
Preferably, folding protective case further includes being arranged between two neighboring upper contact pin 15 and being fixed on interconnecting piece 14
On multiple contact separation pieces 16, be provided on bracket 131 and corresponded with contact separation piece 16 and in electroconductive elastic sheet 132
The holding tank 1311 of contact separation piece 16 is accommodated when contacting with upper contact pin 15.
Fig. 4 is further regarded to incorporated by reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 is the structural schematic diagram of electroconductive elastic sheet of the invention.It is preferred that
Ground, the upper contact part of electroconductive elastic sheet 132 include two shrapnel contact a, b being bent to form by 132 part of electroconductive elastic sheet and connection
Bending section c between two shrapnel contacts a, b, two shrapnel contacts a, b are standby with first when upper cover 11 is closed with lower cover 12
It is connected with battery.Two shrapnel contacts a, b are contacted when upper cover 11 and lower cover 12 are closed with corresponding upper contact pin 15, thus
So that electroconductive elastic sheet 132 is connected with the first reserve battery.
Preferably, electroconductive elastic sheet 132 is metal clips 132, and bracket 131 is plastic material, and bracket 131 passes through Shooting Technique
It is formed and fixed with metal clips 132 in injection molding process.
Fig. 5 is further regarded to incorporated by reference to Fig. 1,2,3,4, Fig. 5 is the structural schematic diagram for the lower cover that the present invention folds protective case.
Preferably, folding protective case further includes the lower contact pin for being arranged on lower cover 12 and being arranged in a one-to-one correspondence with electroconductive elastic sheet 132
16, lower contact pin 16 is contradicted with the lower contact portion d elasticity of corresponding electroconductive elastic sheet 132, and lower cover 12 includes that (figure is not for lower cap body
Show) and the control circuit board 121 that is fixed on lower cap body, lower contact pin 16 is electrically connected with control circuit board 121, in electronics
Control circuit board 121 is electrically connected with electronic equipment 10 when equipment 10 is placed on lower cover 12, control circuit board 121 upper cover 11 with
When lower cover 12 closes, and when the electricity of electronic equipment 10 is lower than default charge value, the first reserve battery of control is electronic equipment
10 chargings or power supply.Default charge value is preferably the one third of the total electricity of electronic equipment 10.In other embodiments, it presets
Charge value may be other values.
Preferably, lower cover 12 further includes the second reserve battery (not shown) being fixed on lower cap body, the second standby electricity
Pond is electrically connected with control circuit board 121.
Preferably, the first reserve battery is encapsulated in upper cap body, and the second reserve battery is encapsulated in lower cap body.First
Reserve battery and the second reserve battery are Thin film cell, and thickness is less than or equal to 0.5 millimeter.
Preferably, lower cover 12 further includes the charging interface 122 being set on lower cap body, charging interface 122 and control electricity
Road plate 121 is electrically connected, and control circuit board 121 is the first reserve battery and/or the when charging interface 122 connects external power supply
The charging of two reserve batteries.It is just the charging of the first reserve battery and when upper cover 11 and lower cover 12 are closed.
It is understood that in other embodiments, the lower cover for folding protective case can also include fixing sleeve, for fixing
Electronic equipment, electronic equipment are sheathed on fixing sleeve, and fixing sleeve is fixedly connected on lower cap body, and fixing sleeve is enclosed in electricity
Four side walls of sub- four sides of equipment, and the close upper cover 11 of fixing sleeve can be further secured to under by folding contact assembly
On the side wall of interconnecting piece 14 at 12 rotation connection of lid.
Preferably, the width of interconnecting piece 14 is equal with the height of bracket 131, and equal with the thickness of electronic equipment 10.?
When upper cover 11 and lower cover 12 close, the folding line of the straight line between interconnecting piece 14 and upper cover 11 and be located at interconnecting piece 14 and under
The folding line of straight line between lid 11 just all coincide with the rib of electronic equipment.
Preferably, electronic equipment 10 can be mobile phone, tablet computer, palm PC or laptop, but be not limited to
This.
It is in contrast to the prior art, the present invention folds contact assembly by setting, and by folding on contact assembly
Electroconductive elastic sheet be connected upper cover and lower cover, the electricity of the first reserve battery in upper cover is transferred in electronic equipment, so as to
The failure for causing product to be broken after upper and lower covers opening and closing repeatedly using winding displacement is avoided, the durability of product can be promoted.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (14)
1. the folding protective case of a kind of electronic equipment, the folding protective case include:
Lower cover, for placing the electronic equipment；
Upper cover can be relatively rotated each other with the lower cover and be connect, wherein the upper cover include upper cap body and with the upper cover
The first fixed reserve battery of main body；
It is characterized in that, the folding protective case further include:
Contact assembly is folded, is set at the upper cover and the lower cover rotation connection；
The folding contact assembly includes being fixed on the bracket at rotation connection and multiple being arranged at intervals on the bracket
Electroconductive elastic sheet, the electroconductive elastic sheet include the lower contact portion be connected with the lower cover or the electronic equipment and are used for described
The upper contact part that lid is connected when closing with the lower cover with first reserve battery, so that the upper cover and the lower cover close
When upper, first reserve battery is connected with the lower cover or the electronic equipment.
2. folding protective case according to claim 1, which is characterized in that the folding protective case further includes interconnecting piece, institute
It states interconnecting piece and the upper cover and the lower cover is rotatablely connected.
3. folding protective case according to claim 2, which is characterized in that the bracket is fixed on the lower lid, described
Folding protective case further includes that the multiple and electroconductive elastic sheet being arranged on the interconnecting piece above contacts pin, institute correspondingly
It states contact pin to be electrically connected with first reserve battery, when the upper cover and the lower cover are closed, the upper contact is drawn
Foot contacts conducting with the upper contact part of the corresponding electroconductive elastic sheet.
4. folding protective case according to claim 2, which is characterized in that the bracket is fixed on the interconnecting piece, institute
Stating and folding protective case further includes the multiple and electroconductive elastic sheet of setting on the cover upper contact pin correspondingly, institute
It states contact pin to be electrically connected with first reserve battery, when the upper cover and the lower cover are closed, the upper contact is drawn
Foot contacts conducting with the upper contact part of the corresponding electroconductive elastic sheet.
5. folding protective case according to claim 3, which is characterized in that the folding protective case further includes being arranged adjacent
Between two upper contact pins and be fixed on multiple contact separation pieces on the interconnecting piece, be provided on the bracket with
The contact separation piece corresponds and for accommodating the contact when the electroconductive elastic sheet and the upper contact pin contact
The holding tank of separate sheet.
6. folding protective case according to claim 1, which is characterized in that the upper contact part of the electroconductive elastic sheet includes two
The shrapnel contact being bent to form by the electroconductive elastic sheet part and the bending section being connected between described two shrapnel contacts, it is described
Two shrapnel contacts are connected when the upper cover is closed with the lower cover with first reserve battery.
7. folding protective case according to claim 6, which is characterized in that be provided on the bracket and each conduction
The mounting hole that elastic slice is correspondingly arranged, the electroconductive elastic sheet are fixed in the mounting hole, are fixed on the fixation electroconductive elastic sheet
In described two mounting holes.
8. folding protective case according to claim 7, which is characterized in that the electroconductive elastic sheet is metal clips, the branch
Frame is plastic material, and the bracket is formed by Shooting Technique and consolidated in the injection molding process with the metal clips
It is fixed.
9. folding protective case according to claim 1, which is characterized in that the folding protective case further includes being arranged described
The lower contact pin being arranged in a one-to-one correspondence on lower lid and with the electroconductive elastic sheet, the lower contact pin and the corresponding conductive bullet
The lower contact portion elasticity of piece contradicts, and the lower cover includes lower cap body and the control circuit board that is fixed on lower cap body, described
Lower contact pin is electrically connected with the control circuit board, the electronic equipment be placed on it is described it is lower cover when the control circuit
Plate is electrically connected with the electronic equipment, and the control circuit board is when the upper cover and the lower cover close, and in the electronics
When the electricity of equipment is lower than default charge value, controlling first reserve battery is that the electronic equipment charges or powers.
10. folding protective case according to claim 9, which is characterized in that the lower cover further includes being fixed on the lower cover
The second reserve battery in main body, second reserve battery are electrically connected with the control circuit board.
11. folding protective case according to claim 10, which is characterized in that first reserve battery is encapsulated on described
In lid main body, second reserve battery is encapsulated in the lower cap body.
12. folding protective case according to claim 10, which is characterized in that the lower cover further includes being set to the lower cover
Charging interface in main body, the charging interface are electrically connected with the control circuit board, and the control circuit board is in the charging
Interface charges when connecting external power supply for first reserve battery and/or second reserve battery.
13. folding protective case according to claim 2, which is characterized in that the width of the interconnecting piece and the bracket
It is highly equal.
14. folding protective case according to claim 2, which is characterized in that the upper cover, the interconnecting piece and it is described under
Lid is integrally formed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2014/095798 WO2016106636A1 (en) | 2014-12-31 | 2014-12-31 | Folding protective sleeve for electronic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107105846A CN107105846A (en) | 2017-08-29 |
| CN107105846B true CN107105846B (en) | 2019-05-21 |
Family
ID=56283910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480083999.9A Active CN107105846B (en) | 2014-12-31 | 2014-12-31 | The folding protective case of electronic equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107105846B (en) |
| WO (1) | WO2016106636A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11201484B2 (en) * | 2019-04-15 | 2021-12-14 | Apple Inc. | Accessory case with a power supply |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651464A (en) * | 2012-05-25 | 2012-08-29 | 深圳市万拓电子技术有限公司 | Detachable contact power supply |
| CN202798107U (en) * | 2012-09-10 | 2013-03-13 | 许诚志 | Electronic product protecting sleeve with stand-by power supply |
| CN103704967A (en) * | 2013-12-30 | 2014-04-09 | 中国科学院上海硅酸盐研究所 | Protection sleeve of portable electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM439833U (en) * | 2012-05-17 | 2012-10-21 | fu-yi Xu | Protective sheath |
-
2014
- 2014-12-31 WO PCT/CN2014/095798 patent/WO2016106636A1/en active Application Filing
- 2014-12-31 CN CN201480083999.9A patent/CN107105846B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102651464A (en) * | 2012-05-25 | 2012-08-29 | 深圳市万拓电子技术有限公司 | Detachable contact power supply |
| CN202798107U (en) * | 2012-09-10 | 2013-03-13 | 许诚志 | Electronic product protecting sleeve with stand-by power supply |
| CN103704967A (en) * | 2013-12-30 | 2014-04-09 | 中国科学院上海硅酸盐研究所 | Protection sleeve of portable electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107105846A (en) | 2017-08-29 |
| WO2016106636A1 (en) | 2016-07-07 |
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Effective date of registration: 20220310 Address after: 233090 no.6525 Donghai Avenue, Bengbu City, Anhui Province (in Anhui Tianxin Heavy Industry Technology Co., Ltd.) Patentee after: Dafu Fangyuan (Anhui) Technology Co.,Ltd. Address before: 518104 Building 9, building 10, Shayi West Industrial Zone, Shajing street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN TATFOOK QUAINTFAB Co.,Ltd. |
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Effective date of registration: 20230330 Address after: 518000 Tianliao Community Industrial Corporation, Yutang Street, Guangming District, Shenzhen, Guangdong Province 401, No. 2TM1, Tianliao Second Industrial Zone Patentee after: Shenzhen Dafu Mingren Technology Co.,Ltd. Address before: 233090 no.6525 Donghai Avenue, Bengbu City, Anhui Province (in Anhui Tianxin Heavy Industry Technology Co., Ltd.) Patentee before: Dafu Fangyuan (Anhui) Technology Co.,Ltd. |
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