CN109322889B - Anti-falling expansion bolt - Google Patents
Anti-falling expansion bolt Download PDFInfo
- Publication number
- CN109322889B CN109322889B CN201811539898.4A CN201811539898A CN109322889B CN 109322889 B CN109322889 B CN 109322889B CN 201811539898 A CN201811539898 A CN 201811539898A CN 109322889 B CN109322889 B CN 109322889B
- Authority
- CN
- China
- Prior art keywords
- section
- expansion
- sleeve
- arc
- sleeve body
- 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.)
- Active
Links
- 230000000149 penetrating effect Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 10
- 238000013459 approach Methods 0.000 claims 2
- 238000005553 drilling Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
- F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
- F16B13/066—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting a separate expander-part, actuated by the screw, nail or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/34—Locking by deformable inserts or like parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
- Furniture Connections (AREA)
Abstract
The invention discloses an anti-falling expansion bolt, which comprises a bolt, a sleeve, a spring washer and an expansion nut, wherein the sleeve comprises a sleeve body, a bottom plate and clamping pieces, wherein the bottom plate and the clamping pieces are arranged at two ends of the sleeve body, through holes are formed in the bottom plate and the sleeve body in a penetrating manner, an arc section protruding outwards is arranged at the position, close to the top end, of the sleeve body, an annular bulge is arranged at the bottom end, located at the arc section, of the inner wall of the through hole, a plurality of first grooves extending to the bottom end and penetrating through the pipe wall are formed in the outer wall of the sleeve body, the expansion nut comprises a cylindrical pressing section and a circular truncated cone-shaped expansion section, threaded holes are formed in the pressing section and the expansion section in a penetrating manner, the clamping pieces are obliquely arranged at the bottom of the sleeve body, the inclination angle of the clamping pieces is matched with the expansion section, and a second groove is formed in the inner wall, close to the bottom end, the clamping pieces are good in tightness, and are suitable for preset holes with larger and deeper apertures, and can prevent falling.
Description
Technical Field
The invention relates to the technical field of expansion bolts, in particular to the technical field of anti-falling expansion bolts.
Background
The expansion bolt generally comprises a screw column body, an expansion head, an expansion sleeve, a nut, a gasket and other parts, and can be divided into an external nut expansion bolt and an internal nut expansion bolt according to the position of the nut. The expansion bolt with the external nut is in a form that the nut is exposed outside, and the expansion bolt is fastened by screwing the nut; the expansion bolt with built-in nut is in a form that the nut (namely, the expansion head) is buried in a drilling hole of a connecting body such as a wall body or concrete, and the expansion bolt is fastened by screwing a screw head at the end part of a screw column body.
The existing expansion bolts cannot drill deep and shallow in the installation process, once the expansion bolts are drilled deep, nuts (namely expansion heads) are easy to fall into the drilling holes, particularly when screw columns are screwed in again, great inconvenience is caused, and when the screw columns are screwed in, the bolts (screw columns) and the nuts are easy to rotate together to generate the phenomenon that the nuts cannot be fastened, so that the use of the expansion bolts is affected. In addition, when the aperture of preset hole is great, if the expansion pipe size is slightly less, the expansion head only expands at the bottom of sheathed tube and fixes the sleeve pipe, makes to treat that the mounting of fixing at the sheathed tube other end appear becoming flexible after receiving many times vibrations easily to lead to equipment or device installation unstable.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides an anti-falling expansion bolt, which can prevent a sleeve from rotating in a hole along with an expansion nut along with the bolt by arranging a bottom plate with a spike at the top end of the sleeve, ensure the tightness of the expansion bolt, prevent the expansion nut from falling by arranging a second groove on a clamping sheet, and ensure the bending deformation of an arc section by retracting the expansion nut so as to respectively clamp a preset hole and the bolt, thereby enhancing the looseness resistance of the expansion bolt.
In order to achieve the above object, the invention provides an anti-falling expansion bolt, which comprises a bolt, a sleeve, a spring washer and an expansion nut, wherein the sleeve comprises a sleeve body, a bottom plate and a clamping piece, wherein the bottom plate and the clamping piece are positioned at two ends of the sleeve body, through holes are formed in the bottom plate and the sleeve body in a penetrating manner, an arc section protruding outwards is arranged at the position, close to the top end, of the sleeve body, annular protrusions are arranged at the bottom end, positioned on the inner wall of the through holes, of the arc section, a plurality of first grooves extending to the bottom end and penetrating through the pipe wall are formed in the outer wall of the sleeve body, the expansion nut comprises a cylindrical pressing section and a circular truncated cone-shaped expansion section, threaded holes are formed in the pressing section and the expansion section in a penetrating manner, the clamping piece is obliquely arranged at the bottom of the sleeve body, the inclination angle of the clamping piece is matched with that of the expansion section, a second groove is formed in the inner wall, close to the bottom end of the clamping piece is inwards bent along the second groove to form a cavity, and accordingly the expansion section is fixed inside, and the bolt comprises a hexagonal screw head and a screw with external threads, and the screw sequentially penetrates through the spring, the sleeve and the expansion nut from top to bottom.
Preferably, the card and the first groove are staggered along the axis of the sleeve.
Preferably, the compression section and the expansion section are of an integrated structure, the outer diameter of the top end of the expansion section is the same as that of the compression section, and the expansion section can expand the sleeve along the groove when entering the sleeve.
Preferably, the aperture of the through hole below the arc-shaped section is matched with the outer diameter of the compression section, the aperture of the through hole above the arc-shaped section is matched with the outer diameter of the screw rod, the inner diameter of the annular bulge is slightly larger than the outer diameter of the compression section, the aperture of the threaded hole is matched with the outer diameter of the screw rod, and the length of the through hole below the arc-shaped section is consistent with the length of the compression section.
Preferably, the thickness of the tube wall of the sleeve at the arcuate segment is less than the thickness of the tube wall below the arcuate segment.
Preferably, the bottom surface of the bottom plate is provided with a plurality of spines.
The invention has the beneficial effects that: according to the invention, the bottom plate with the spike is arranged at the top end of the sleeve, so that the sleeve and the expansion nut are prevented from rotating in the hole along with the bolt, the tightness of the expansion bolt is ensured, the second groove is arranged on the clamping piece to enable the clamping piece to be bent, the expansion nut is prevented from falling, the arc-shaped section is enabled to be bent and deformed through the retraction of the expansion nut, the preset hole and the bolt are respectively clamped, and the looseness of the expansion bolt is enhanced.
The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.
Drawings
FIG. 1 is a front view of an anti-backout expansion bolt of the present invention;
FIG. 2 is a front view of a sleeve of an anti-backup expansion bolt of the present invention;
FIG. 3 is a top view of a sleeve of an anti-backup expansion bolt of the present invention;
FIG. 4 is a front view of an expansion nut of an anti-backout expansion bolt of the present invention;
fig. 5 is a front view of a bolt of an anti-backout expansion bolt of the present invention.
In the figure: 1-bolts, 11-hexagonal heads, 12-screws, 2-bushings, 21-bottom plates, 211-spikes, 22-bushing bodies, 221-annular protrusions, 222-first grooves, 23-arcuate sections, 24-cards, 241-second grooves, 25-through holes, 3-spring washers, 4-expansion nuts, 41-compression sections, 42-expansion sections, and 43-threaded holes.
Description of the embodiments
Referring to fig. 1 to 5, the invention relates to an anti-falling expansion bolt, which comprises a bolt 1, a sleeve 2, a spring washer 3 and an expansion nut 4, wherein the sleeve 2 comprises a sleeve body 22, a bottom plate 21 and a clamping piece 24 which are positioned at two ends of the sleeve body 22, through holes 25 are arranged in the bottom plate 21 and the sleeve body 22 in a penetrating way, an arc section 23 which protrudes outwards is arranged at the position, close to the top end, of the sleeve body 2, an annular bulge 221 is arranged at the bottom end of the arc section 23 on the inner wall of the through hole 25, a plurality of first grooves 222 which extend to the bottom end and penetrate through the pipe wall are arranged on the outer wall of the sleeve body 22, the expansion nut 5 comprises a cylindrical pressing section 41 and a truncated cone-shaped expansion section 42, threaded holes 43 are arranged in the pressing section 41 and the expansion section 42 in a penetrating way, the clamping piece 24 is obliquely arranged at the bottom of the sleeve body 22 and forms a flaring, the inclination angle of the clamping piece 24 is matched with that of the expansion section 42, a second groove 241 is arranged on the inner wall of the clamping piece 24 close to the bottom end and can be inwards bent along the second groove 241 to form a cavity so as to fix the expansion section 42 inside, the bolt 1 comprises a hexagonal screw head 11 and a screw rod 12 with external threads, the screw rod 12 sequentially passes through the spring washer 3, the sleeve 2 and the expansion nut 4 from top to bottom, the clamping piece 24 and the first groove 222 are staggered along the axis of the sleeve 2, the compression section 41 and the expansion section 42 are of an integral structure, the outer diameter of the top end of the expansion section 42 is the same as that of the compression section 41, the expansion section 42 can expand the sleeve 2 along the groove 222 when entering the sleeve 2, the aperture of the through hole 25 below the arc section 23 is matched with that of the compression section 41, the aperture of the through hole 25 above the arc section 23 is matched with that of the screw rod 12, the inner diameter of the annular bulge 221 is slightly larger than the outer diameter of the pressing section 41, the aperture of the threaded hole 43 is matched with the outer diameter of the screw rod 12, the length of the through hole 25 below the arc section 23 is consistent with the length of the pressing section 41, the thickness of the pipe wall of the sleeve 2 at the arc section 23 is smaller than that of the pipe wall below the arc section 23, and the bottom surface of the bottom plate 21 is provided with a plurality of spikes 211.
The working process of the invention comprises the following steps:
in the working process of the anti-falling expansion bolt, firstly, the compression section 41 of the expansion nut 4 is inserted into the through hole 25 from the bottom of the sleeve 2, the expansion section 42 of the expansion nut 4 is placed in the flaring in the clamping piece 24 at the bottom end of the sleeve 2, then the clamping piece 24 is bent inwards along the second groove 241 so as to fix the expansion nut 4 in the cavity formed by bending the clamping piece 24, and the sleeve 2 is inserted into the preset hole in the downward direction of the clamping piece 24. Then, the through hole of the to-be-fixed piece is aligned with the preset hole on the ground or the wall body, and the bolt 1 passes through the spring washer 3 and then is inserted into the preset hole. The bolt 1 is tightened such that the expansion nut 4 is retracted along the shank 12 of the bolt 1. Along with the retraction of the expansion nut 4, the pressing section 41 gradually presses the arc section 23 with the thinner pipe wall upwards to enable the larger bending part at the lower side of the arc section 23 to continuously bend along the original bending direction, the larger bending part of the arc section 23 protrudes outwards and clamps the hole wall of the preset hole, when the ground or the wall surface is loose in texture, the preset hole can be penetrated even, then the pressing section 41 gradually passes through the annular protrusion 221, and the expansion section 42 enters the sleeve 2 to enable the sleeve 2 to expand along the first groove 222.
According to the invention, the bottom plate with the spike is arranged at the top end of the sleeve, so that the sleeve and the expansion nut are prevented from rotating in the hole along with the bolt, the tightness of the expansion bolt is ensured, the second groove is arranged on the clamping piece to enable the clamping piece to be bent, the expansion nut is prevented from falling, the arc-shaped section is enabled to be bent and deformed through the retraction of the expansion nut, the preset hole and the bolt are respectively clamped, and the looseness of the expansion bolt is enhanced.
The above embodiments are illustrative of the present invention, and not limiting, and any simple modifications of the present invention fall within the scope of the present invention.
Claims (5)
1. An anti-disengagement expansion bolt, which is characterized in that: the sleeve comprises a bolt (1), a sleeve (2), a spring washer (3) and an expansion nut (4), wherein the sleeve (2) comprises a sleeve body (22) and a bottom plate (21) and clamping pieces (24) which are positioned at two ends of the sleeve body (22), through holes (25) are formed in the bottom plate (21) and the sleeve body (22) in a penetrating mode, an outwards protruding arc-shaped section (23) is arranged at the position, close to the top end, of the sleeve body (22), an annular protrusion (221) is arranged at the bottom end, positioned at the arc-shaped section (23), of the inner wall of the through hole (25), a plurality of first grooves (222) which extend to the penetrating pipe wall at the bottom end are formed in the outer wall of the sleeve body (22), the expansion nut (4) comprises a cylindrical pressing section (41) and a circular truncated cone-shaped expansion section (42), threaded holes (43) are formed in the pressing section (41) and the expansion section (42) in a penetrating mode, the clamping pieces (24) are obliquely arranged at the bottom of the sleeve body (22) and form a flaring, the inclination angle of the clamping pieces (24) is matched with the expansion section (42), a second groove (241) is formed on the inner wall, close to the inner wall (24) to the bottom end of the second groove (241) and can be fixed into the inner cavity (42) along the second groove (42), the bolt (1) comprises a hexagonal screw head (11) and a screw rod (12) with external threads, the screw rod (12) sequentially penetrates through a spring washer (3), a sleeve (2) and an expansion nut (4) from top to bottom, the compression section (41) and the expansion section (42) are of an integrated structure, the outer diameter of the top end of the expansion section (42) is the same as the outer diameter of the compression section (41), the sleeve (2) can be expanded along a first groove (222) when the expansion section (42) enters the sleeve (2), and the thickness of a pipe wall of the sleeve (2) at the arc section (23) is smaller than that of a pipe wall below the arc section (23); the expansion nut (4) is retracted, the compression section (41) gradually compresses the arc section (23) with thinner pipe wall upwards, so that the larger bending part at the lower side of the arc section (23) continues to bend along the original bending direction, the larger bending part of the arc section (23) protrudes outwards and clamps the hole wall of the preset hole, meanwhile, the sleeve body (22) below the arc section (23) gradually approaches the bottom plate (21) upwards due to the deformation of the arc section (23), and the smaller bending part at the upper side of the arc section (23) continues to bend along the original bending direction, so that the recess (231) approaches to the axle center and clamps the bolt (1).
2. An anti-backout expansion bolt according to claim 1, wherein: the card (24) and the first groove (222) are distributed along the axis of the sleeve (2) in a staggered manner.
3. An anti-backout expansion bolt according to claim 1, wherein: the aperture of the through hole (25) below the arc-shaped section (23) is matched with the outer diameter of the pressing section (41), the aperture of the through hole (25) above the arc-shaped section (23) is matched with the outer diameter of the screw (12), the inner diameter of the annular bulge (221) is slightly larger than the outer diameter of the pressing section (41), the aperture of the threaded hole (43) is matched with the outer diameter of the screw (12), and the length of the through hole (25) below the arc-shaped section (23) is consistent with the length of the pressing section (41).
4. An anti-backout expansion bolt according to claim 1, wherein: the arc-shaped section (23) is provided with a recess (231) near the top end, and the inner diameter of the recess (231) is larger than the outer diameter of the screw rod (12).
5. An anti-backout expansion bolt according to claim 1, wherein: the bottom surface of the bottom plate (21) is provided with a plurality of spines (211).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811539898.4A CN109322889B (en) | 2018-12-17 | 2018-12-17 | Anti-falling expansion bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811539898.4A CN109322889B (en) | 2018-12-17 | 2018-12-17 | Anti-falling expansion bolt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109322889A CN109322889A (en) | 2019-02-12 |
| CN109322889B true CN109322889B (en) | 2023-08-25 |
Family
ID=65257384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811539898.4A Active CN109322889B (en) | 2018-12-17 | 2018-12-17 | Anti-falling expansion bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109322889B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110873105A (en) * | 2019-11-20 | 2020-03-10 | 上海令恩工程科技有限公司 | Installation method of standard sleeve self-locking one-way bolt |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463854A (en) * | 2009-01-10 | 2009-06-24 | 金拯 | Expansion bolt |
| JP3205310U (en) * | 2016-05-06 | 2016-07-21 | 張三河 | Corrugated support frame fastening structure |
| CN206487734U (en) * | 2016-12-21 | 2017-09-12 | 久可工业股份有限公司 | It can prevent from expanding incomplete expansion bolt |
| CN207848139U (en) * | 2017-12-13 | 2018-09-11 | 苏州茂隆电梯配件有限公司 | A kind of hollow anchor bolt |
| CN209705022U (en) * | 2018-12-17 | 2019-11-29 | 嘉兴钰丰汽车零部件有限公司 | A kind of Anti-extrusion expansion bolt |
-
2018
- 2018-12-17 CN CN201811539898.4A patent/CN109322889B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463854A (en) * | 2009-01-10 | 2009-06-24 | 金拯 | Expansion bolt |
| JP3205310U (en) * | 2016-05-06 | 2016-07-21 | 張三河 | Corrugated support frame fastening structure |
| CN206487734U (en) * | 2016-12-21 | 2017-09-12 | 久可工业股份有限公司 | It can prevent from expanding incomplete expansion bolt |
| CN207848139U (en) * | 2017-12-13 | 2018-09-11 | 苏州茂隆电梯配件有限公司 | A kind of hollow anchor bolt |
| CN209705022U (en) * | 2018-12-17 | 2019-11-29 | 嘉兴钰丰汽车零部件有限公司 | A kind of Anti-extrusion expansion bolt |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109322889A (en) | 2019-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109322889B (en) | Anti-falling expansion bolt | |
| RU2003107341A (en) | PILES CONNECTOR | |
| CN107202056A (en) | A kind of expansion bolt | |
| CN113700725A (en) | Fastening long screw with adjustable length | |
| CN111022848B (en) | Fixing device and cold box | |
| CN209705022U (en) | A kind of Anti-extrusion expansion bolt | |
| CN109372862B (en) | Expansion bolt suitable for large aperture | |
| CN216343257U (en) | Expansion bolt capable of being repeatedly used | |
| CN105736547A (en) | Bolt and bolt assembly | |
| CN109340234B (en) | Embossing type anti-drop expansion bolt | |
| CN211648755U (en) | Novel anti-theft bolt | |
| CN211648706U (en) | Expansion bolt | |
| CN203532453U (en) | Tapping expansion screw improved structure | |
| CN207229545U (en) | Speciality expansion anchor is used in one kind fixation | |
| CN111219402A (en) | Novel self tapping bores combination bolt | |
| CN210263421U (en) | Self-tapping screw for building component | |
| CN219953877U (en) | Shock-resistant heavy machinery anchor bolt | |
| CN202812545U (en) | Fixing clamping hoop for pipeline | |
| CN210531360U (en) | Taper sleeve type bidirectional expansion bolt | |
| CN203257845U (en) | Fastening barrel for combining parts on model | |
| CN220486699U (en) | Grille fixing device | |
| CN215634230U (en) | Self-locking high-strength expansion bolt | |
| CN109322890B (en) | Quick installation type expansion bolt | |
| CN216742348U (en) | Fastening anchor | |
| CN209892583U (en) | Anti-seismic anchor bolt assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 314300 Qinshan Street Industrial Park, Haiyan County, Jiaxing City, Zhejiang Province Applicant after: Jiaxing Yufeng Auto Parts Co.,Ltd. Address before: 314300 Qinshan Street Industrial Park, Haiyan County, Jiaxing City, Zhejiang Province Applicant before: JIAXING YUFENG CAR PARTS Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |