CN112854933B - Convenient installation door - Google Patents
Convenient installation door Download PDFInfo
- Publication number
- CN112854933B CN112854933B CN202110190670.4A CN202110190670A CN112854933B CN 112854933 B CN112854933 B CN 112854933B CN 202110190670 A CN202110190670 A CN 202110190670A CN 112854933 B CN112854933 B CN 112854933B
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- Prior art keywords
- plate
- door
- rotary drum
- support
- groove
- Prior art date
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- 238000009434 installation Methods 0.000 title claims abstract description 10
- 230000000670 limiting effect Effects 0.000 claims abstract description 24
- 230000000712 assembly Effects 0.000 claims abstract description 3
- 238000000429 assembly Methods 0.000 claims abstract description 3
- 229910052573 porcelain Inorganic materials 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
- E05D7/00—Hinges or pivots of special construction
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
- E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
- E05C17/02—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means
- E05C17/46—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member
- E05C17/52—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member comprising a snap, catch, or the like
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
- E05D11/00—Additional features or accessories of hinges
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05D—HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS
- E05D11/00—Additional features or accessories of hinges
- E05D11/04—Additional features or accessories of hinges relating to the use of free balls as bearing-surfaces
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hinges (AREA)
Abstract
The invention relates to a conveniently-installed door which comprises a door plate (1), wherein the door plate (1) is fixedly connected in a door frame through a group of hinge devices, each hinge device comprises a rotary drum assembly (2) and a hook assembly (7) which are correspondingly matched and connected, the rotary drum assembly (2) is fixedly connected to one side of the door plate (1), and the hook assemblies (7) are fixedly connected in the door frame. The invention has the advantages that: when the door opening and closing device is installed, the baffle plates on the two sides are convenient for the rotating drum to be positioned, the limiting blocks are convenient for the rotating drum to be matched with the inserted rod, the assembly is convenient, the technical problem that the installation is inconvenient in the prior art is effectively solved, the bearing is informed to be sleeved on the outer side of the inserted rod, and the ball is arranged at the bottom of the rotating drum, so that the noise caused by friction when the door is opened and closed in the prior art is effectively solved.
Description
Technical Field
The invention relates to the technical field of home furnishing, in particular to a door convenient to install.
Background
With the change of decoration style, the door style is changed into the five-flower eight-door style, but the door style is still unchanged for the wooden door used at home. The door plate and the door frame of the common household wood door are connected by using hinges, and the door plate and the door frame can be installed only by fixing the relative positions of the door plate and the door frame on the same horizontal plane when the hinges are installed, so that the door plate and the door frame can be installed only by cooperation of a plurality of persons. After the door plant uses for a long time, because the hinge wearing and tearing can cause door plant and door frame extrusion influence to use, still can give off frictional sound when opening and shutting the door plant, give other people and bring uncomfortable sense.
Disclosure of Invention
In order to solve the technical problem, the invention provides a door convenient to install.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a convenient installation door which characterized in that: the door plate is fixedly connected in a door frame through a group of hinge devices, each hinge device comprises a drum assembly and a hook assembly which are correspondingly matched and connected, the drum assembly is fixedly connected to one side of the door plate, and the hook assemblies are fixedly connected in the door frame;
the drum assembly comprises a mounting plate fixedly connected to the door plate, the mounting plate is connected with a fixing ring, and a drum is connected in the fixing ring in a rotating fit manner;
the hook component comprises a fixed plate fixedly connected in the door frame, a bottom plate is arranged on the fixed plate, a supporting plate is connected to the fixed plate on the upper side of the bottom plate in a sliding mode through a sliding rail, an inserting rod is arranged on the bottom plate, a jack is arranged in the supporting plate, the inserting rod is arranged in the jack, and the inserting rod is correspondingly inserted into a corresponding rotary drum.
On the basis of the scheme, the following scheme can be adopted:
the rotary drum comprises a drum body, a stepped through hole is formed in the drum body, an annular clamping groove is formed in the outer wall of the drum body, and the fixing ring is sleeved in the annular clamping groove.
The supporting plate is further provided with an annular matching groove, the rotary drum is correspondingly arranged in the matching groove, the matching groove and the jack are coaxially arranged, a group of balls are further arranged in the matching groove, an annular guide groove is formed in the bottom of the rotary drum, and the balls are correspondingly arranged in the annular guide groove.
The bottom plate is provided with a first installation cylinder, the inserted bar is arranged in the first installation cylinder, the inserted bar is sleeved with a first spring, and the support plate is in compression fit with the first spring.
Install the guide bar on the bottom plate be equipped with the guiding hole in the backup pad, the guide bar corresponds the direction cooperation with the guiding hole in, is equipped with the limiting plate in the upper end of guide bar, and the limiting plate setting cup joints the second spring at the upside of backup pad on the guide bar, backup pad and second spring press fit.
And a second mounting cylinder is arranged on the bottom plate, and the guide rod and the second spring are correspondingly arranged in the second mounting cylinder.
The bottom plate is provided with a support rod, the top end of the support rod is provided with a support ball, the bottom of the bottom plate is also provided with a groove, and the support ball and the groove are arranged correspondingly.
The support ball is a magnetic ball, an arc-shaped porcelain plate is further installed in the groove, and the support ball and the arc-shaped porcelain plate are correspondingly in adsorption fit.
The two sides above the supporting plate are respectively provided with a baffle, a limiting block is arranged between the two baffles, and the baffles and the limiting block are in limiting fit with the rotary drum.
The invention has the beneficial effects that: when the door opening and closing device is installed, the baffle plates on the two sides are convenient for the rotating drum to be positioned, the limiting blocks are convenient for the rotating drum to be matched with the inserted rod, the assembly is convenient, the technical problem that the installation is inconvenient in the prior art is effectively solved, the bearing is informed to be sleeved on the outer side of the inserted rod, and the ball is arranged at the bottom of the rotating drum, so that the noise caused by friction when the door is opened and closed in the prior art is effectively solved.
Drawings
FIG. 1 is a schematic diagram of the basic structure of the present invention;
FIG. 2 is a schematic view of a connection structure between a door panel and a rotary drum;
FIG. 3 is a cross-sectional view of the drum;
FIG. 4 is a schematic view of a hook assembly;
FIG. 5 is a structural view of the hook assembly in another state;
FIG. 6 is a schematic view showing the suction state between the suction plate assembly and the suction head assembly.
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.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
As shown in fig. 1, 2, 3, 4 and 5, the present invention relates to a door with convenient installation, which comprises a door panel 1, wherein the door panel 1 is the prior art, the door panel 1 is connected and fixed in a door frame through two hinge devices, and the door frame diagram is not shown. Hinge means is including corresponding the rotary drum subassembly 2 and the couple subassembly 7 that the cooperation is connected, and rotary drum subassembly 2 fixed connection is in one side of door plant 1, and couple subassembly 7 fixed connection is in the door frame.
The barrel assembly 2 comprises a mounting plate 4, the mounting plate 4 is connected to the side wall of the door plate 1, the mounting plate 4 is inserted into the door plate 1, the mounting plate 4 is connected with a fixing ring 3, the fixing ring 3 is of a circular ring plate-shaped structure, the outer side of the mounting plate 4 is arranged in an opening of the fixing ring 3, and the mounting plate is connected and fixed through a screw 5. The rotating drum 6 is connected in a rotating fit manner in the fixed ring 3, and a bearing is arranged between the fixed ring 3 and the rotating drum 6. The rotary drum 6 comprises a circular barrel 6.1, a step through hole 6.2 is formed in the barrel 6.1, an additional bearing is installed in the step through hole 6.2, an annular clamping groove 6.3 is formed in the outer wall of the barrel 6.1, and the fixing ring 3 is correspondingly connected into the annular clamping groove 6.3. The bottom of the cylinder body 6.1 is also provided with an annular guide groove 6.4, the annular guide groove 6.4 is an open groove with a semicircular cross section, and the annular guide groove 6.4 and the stepped through hole 6.2 are coaxially arranged.
The hook component 7 comprises a fixing plate 8 which is fixed in the door frame through screw connection, and the fixing plate 8 is a rectangular plate. A bottom plate 9 is arranged at the lower part of the outer side of the fixing plate 8, a supporting plate 11 is also connected on the fixing plate 8 at the upper side of the bottom plate 9 in a sliding way through a sliding rail 10, and the supporting plate 11 is also a rectangular plate. A first mounting tube 18 and a second mounting tube 19 are welded to the bottom plate 9, the first mounting tube 18 and the second mounting tube 19 are cylinders, and the first mounting tube 18 is disposed outside the second mounting tube 19. An inserting rod 16 and a guide rod 13 are welded on the bottom plate 9, the inserting rod 16 and the guide rod 13 are round rods, a first spring 17 is sleeved on the inserting rod 16, and the supporting plate 11 is in press fit with the first spring 17. The insertion rod 16 and the first spring 17 are inserted into the corresponding drums 6. A second spring 14 is sleeved on the guide rod 13, and the second spring 14 is also in press fit with the first spring 17. The guide rod 13 and the second spring 14 are correspondingly arranged in the second mounting cylinder 19, and the support plate 11 is in press fit with the second spring 14.
The supporting plate 11 is provided with a jack 11.1 and a guide hole, the jack 11.1 and the guide hole are circular through holes, the rotating bearing 20 is installed in the jack 11.1, the lower side of the rotating bearing 20 is provided with a limiting flange 20.1, the upper side of the jack 11.1 is provided with a retaining ring 11.4, and the retaining ring 11.4 is in limiting fit with the limiting flange 20.1. The bottom of the tight rolling bearing 20 in upper end top of first spring 17, when the installation door, inserted bar 16 corresponds the grafting at rolling bearing 20, door plant 1 drives backup pad 11 and pushes down under the action of gravity, make rolling bearing 20 get into in the barrel 6.1, under limiting flange 20.1's limiting displacement, make rolling bearing 20's lower extreme be in jack 11.1 always, rolling bearing 20's upside gets into in ladder through-hole 6.2, still be equipped with other bearing in the ladder through-hole 6.2 of rolling bearing 20 upside, not drawn in this bearing picture, inserted bar 16 is at the bearing internal rotation.
The guide rod 13 corresponds the direction setting and is in the guiding hole, passes through the fixed limiting plate 15 of screwed connection in the upper end of guide rod 13, and limiting plate 15 sets up the upside at backup pad 11, and after door plant 1 was taken off, backup pad 11 can not break away from bottom plate 9 under limiting plate 15's effect, makes the top of inserted bar 16 be less than the last side of backup pad 11 simultaneously, when being convenient for install door plant 1, the putting into of rotary drum 6.
The support plate 11 is further provided with an annular matching groove 11.3, the matching groove 11.3 and the insertion hole 11.1 are coaxially arranged, when the door panel 1 is installed, the rotary drum 6 is correspondingly arranged in the matching groove 11.3, the matching groove 11.3 is further provided with a group of balls 25, and the balls 25 are correspondingly arranged in the annular guide groove 6.4.
Two sides above the supporting plate 11 are respectively provided with a baffle 23, a limiting block 24 is arranged between the two baffles 23, when the door panel 1 is installed, the rotary drum 6 is placed between the two baffles 23 to push the door panel 1 inwards, and under the limiting action of the limiting block 24, the rotary drum 6 reaches the position right above the inserted rod 16. During operation, the operator lifts the door panel 1 upward, so that the door panel 1 is not pressed down by gravity, and the insertion rod 16 leaks out and cannot be installed.
A support bar 21 is mounted on the base plate 9, and the support bar 21 is disposed between the guide bar 13 and the insert bar 16. The top end of the support rod 21 is provided with a support ball 22, the bottom of the bottom plate 9 is also provided with a groove 11.2, and the support ball 22 is arranged corresponding to the groove 11.2. The support balls 22 are magnetic balls, arc-shaped porcelain plates are further installed in the grooves 11.2, and the support balls 22 are correspondingly adsorbed and matched with the arc-shaped porcelain plates.
Referring to fig. 6, a suction plate assembly 26 is further installed on the lower side of the door panel 1, and a suction head assembly 27 corresponding to the suction plate assembly 26 and in suction engagement is installed on the wall. When the door is opened, the suction plate assembly 26 and the suction head assembly 27 are adsorbed to play a fixing role. The suction plate assembly 26 comprises a mounting plate 26.1, the mounting plate 26.1 is connected to the door plate 1 through screws, and a magnetic plate 26.2 is fixedly connected to the outer side of the mounting plate 26.1. The suction head assembly 27 comprises a mounting seat 28 mounted on the wall, a ball 28.1 is arranged at the top of the mounting seat 28, a spherical magnetic sleeve 29 is sleeved on the ball 28.1, and the magnetic sleeve 29 is correspondingly matched with the magnetic plate 26.2 in an adsorption manner.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The utility model provides a convenient installation door which characterized in that: the door comprises a door plate (1), wherein the door plate (1) is fixedly connected in a door frame through a group of hinge devices, each hinge device comprises a rotary drum assembly (2) and a hook assembly (7) which are correspondingly matched and connected, the rotary drum assembly (2) is fixedly connected to one side of the door plate (1), and the hook assemblies (7) are fixedly connected in the door frame;
the drum assembly (2) comprises a mounting plate (4) fixedly connected to the door panel (1), the mounting plate (4) is connected with the fixing ring (3), and the drum assembly is connected with the drum (6) in a rotating fit manner in the fixing ring (3);
the hook assembly (7) comprises a fixing plate (8) fixedly connected in a door frame, a base plate (9) is arranged on the fixing plate (8), the fixing plate (8) on the upper side of the base plate (9) is further connected with a supporting plate (11) in a sliding mode through a sliding rail (10), an inserting rod (16) is arranged on the base plate (9), a jack (11.1) is arranged on the supporting plate (11), the inserting rod (16) is arranged in the jack (11.1), and the inserting rod (16) is correspondingly inserted in the corresponding rotary drum (6);
a first mounting cylinder (18) is arranged on the bottom plate (9), the inserted bar (16) is arranged in the first mounting cylinder (18), a first spring (17) is sleeved on the inserted bar (16), and the support plate (11) is in press fit with the first spring (17);
a guide rod (13) is mounted on the bottom plate (9), a guide hole is formed in the support plate (11), the guide rod (13) is correspondingly guided and matched with the guide hole, a limiting plate (15) is arranged at the upper end of the guide rod (13), the limiting plate (15) is arranged on the upper side of the support plate (11), a second spring (14) is sleeved on the guide rod (13), and the support plate (11) is in compression fit with the second spring (14);
a support rod (21) is arranged on the bottom plate (9), a support ball (22) is arranged at the top end of the support rod (21), a groove (11.2) is further arranged at the bottom of the bottom plate (9), and the support ball (22) is arranged corresponding to the groove (11.2);
the rotary drum (6) comprises a drum body (6.1), a stepped through hole (6.2) is formed in the drum body (6.1), an annular clamping groove (6.3) is formed in the outer wall of the drum body (6.1), and the fixing ring (3) is sleeved in the annular clamping groove (6.3);
the rotary drum is characterized in that an annular matching groove (11.3) is further formed in the supporting plate (11), the rotary drum (6) is correspondingly arranged in the matching groove (11.3), the matching groove (11.3) and the jack (11.1) are coaxially arranged, a group of balls (25) are further arranged in the matching groove (11.3), an annular guide groove (6.4) is formed in the bottom of the rotary drum (6), and the balls (25) are correspondingly arranged in the annular guide groove (6.4).
2. A ready-to-install door as defined in claim 1, wherein: the bottom plate (9) is provided with a second mounting cylinder (19), and the guide rod (13) and the second spring (14) are correspondingly arranged in the second mounting cylinder (19).
3. A ready-to-install door as defined in claim 1, wherein: the support balls (22) are magnetic balls, arc-shaped porcelain plates are further installed in the grooves (11.2), and the support balls (22) are correspondingly adsorbed and matched with the arc-shaped porcelain plates.
4. A ready-to-install door as defined in claim 1, wherein: baffles (23) are respectively arranged on two sides above the supporting plate (11), a limiting block (24) is arranged between the two baffles (23), and the baffles (23) and the limiting block (24) are in limiting fit with the rotary drum (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110190670.4A CN112854933B (en) | 2021-02-20 | 2021-02-20 | Convenient installation door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110190670.4A CN112854933B (en) | 2021-02-20 | 2021-02-20 | Convenient installation door |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112854933A CN112854933A (en) | 2021-05-28 |
| CN112854933B true CN112854933B (en) | 2023-03-24 |
Family
ID=75988194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110190670.4A Active CN112854933B (en) | 2021-02-20 | 2021-02-20 | Convenient installation door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112854933B (en) |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2037517C3 (en) * | 1970-07-29 | 1973-10-31 | Franz Waffenschmidt Gemotec Gesellschaft Fuer Moderne Technik, 5000 Koeln | Hinge for frameless all-glass sashes of windows or doors |
| CH611380A5 (en) * | 1976-12-21 | 1979-05-31 | Hans Gachnang | Door with wood-cased metal frame and wooden wing |
| JPH1025949A (en) * | 1996-07-12 | 1998-01-27 | Nitto Kogyo Kk | Mounting mechanism of door in box, etc. |
| DE29816601U1 (en) * | 1998-09-16 | 1998-12-17 | Hettich-Heinze GmbH & Co. KG, 32139 Spenge | hinge |
| CN2871760Y (en) * | 2006-03-16 | 2007-02-21 | 冯政 | Hinge |
| KR20080007538A (en) * | 2007-12-31 | 2008-01-22 | 윤선영 | A hinge for door |
| CN201953205U (en) * | 2010-12-22 | 2011-08-31 | 奉化市金辉五金制品有限公司 | Hinge improved structure |
| KR101609872B1 (en) * | 2015-01-27 | 2016-04-07 | 주식회사 가자 | Hinge for Opening and Closing a Door |
| CN205382806U (en) * | 2015-12-10 | 2016-07-13 | 天津忠旺门窗工程有限公司 | But plug hinge |
| CN205330336U (en) * | 2016-01-19 | 2016-06-22 | 江苏好的节能光电科技有限公司 | Removable location damping hinge |
| CN106837036B (en) * | 2017-04-10 | 2018-08-07 | 山东理工大学 | Device for the connection of emergency unchaining body hinge |
| CN107675974A (en) * | 2017-10-30 | 2018-02-09 | 经纬纺织机械股份有限公司 | Ring throstle bellows hinge means |
| CN107939199A (en) * | 2017-11-20 | 2018-04-20 | 平湖福达五金制品有限公司 | A kind of detachable hinge |
| CN108412384A (en) * | 2018-05-08 | 2018-08-17 | 苏州荣盾人防工程防护设备有限公司 | A kind of closed guard gate easy for removal and installation |
| CN109763731A (en) * | 2019-04-02 | 2019-05-17 | 江顺富 | A kind of door leaf connector |
| CN110107178B (en) * | 2019-04-22 | 2020-11-17 | 周芮竹 | Revolving door translation device |
| CN213116037U (en) * | 2020-05-07 | 2021-05-04 | 石狮市天宏金属制品有限公司 | Assembled convenient fire door that prevents of dismantling |
-
2021
- 2021-02-20 CN CN202110190670.4A patent/CN112854933B/en active Active
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| Publication number | Publication date |
|---|---|
| CN112854933A (en) | 2021-05-28 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 233000 No.1 Workshop, 199 Jinniu Road, Huaishang District, Bengbu City, Anhui Province Patentee after: Nino Energy Conservation Technology Co.,Ltd. Country or region after: China Address before: 233000 No.1 Workshop, 199 Jinniu Road, Huaishang District, Bengbu City, Anhui Province Patentee before: Anhui Ninuo Energy Saving Technology Co.,Ltd. Country or region before: China |
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| CP03 | Change of name, title or address | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A convenient installation door Granted publication date: 20230324 Pledgee: Agricultural Bank of China Limited Guzhen County Branch Pledgor: Nino Energy Conservation Technology Co.,Ltd. Registration number: Y2024980010238 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |