CN107023556A - Nut and screw rod - Google Patents
Nut and screw rod Download PDFInfo
- Publication number
- CN107023556A CN107023556A CN201710298629.2A CN201710298629A CN107023556A CN 107023556 A CN107023556 A CN 107023556A CN 201710298629 A CN201710298629 A CN 201710298629A CN 107023556 A CN107023556 A CN 107023556A
- Authority
- CN
- China
- Prior art keywords
- thread segment
- nut
- screw rod
- groove
- nominal dimension
- 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.)
- Pending
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 210000002421 cell wall Anatomy 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 2
- 230000035939 shock 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
- F16B37/00—Nuts or like thread-engaging members
-
- 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
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
- F16B35/048—Specially-shaped necks
-
- 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
- F16B39/282—Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
Abstract
The invention discloses a kind of nut and screw rod, nut be cannula-like and its in be provided with thread segment, annular groove is provided with one stomidium inwall of thread segment, the aperture that the aperture that the notch of groove is pointed on Kong Xin, the nut at the groove notch of precession direction front end is more than at the groove notch of the nominal dimension of thread segment or precession direction rear end is less than the nominal dimension of thread segment.A kind of screw rod, there is thread segment on the shaft of screw rod, flange collar to the distance of bar core that precession direction front end on ring-type flange collar, the screw rod is provided with one end shaft outer peripheral face of the thread segment is less than the nominal dimension that the nominal dimension of thread segment or the flange collar of precession direction rear end are more than thread segment to the distance of bar core.The tube wall elasticity of nut is deformed so that the groove in flange collar and nut on screw rod coordinates, so not only ensure the reliability of threaded connection, reach significant locking anticreep effect, nut and screw rod are dismantled by applying excessive power, this makes it possible to reuse, with cost-effective.
Description
Technical field
The present invention relates to bolt connection field, specially a kind of nut and screw rod.
Background technology
Threaded connection typically has self-locking performance, and the frictional force on the supporting surface on nut and bolt head also has locking work in addition
With, thus tighten it is latter as will not release.The key of thread connection anti-loose is exactly to prevent from relatively rotating, at present conventional anti-loose method
There is friction locking, mechanical locking and bolt is changed into non-disconnectable connection.But under the influence of complicated external environment, such as meet
Under to shock and vibration or varying load effect and in the larger situation of high temperature or temperature change, the frictional force meeting between screw thread
Instantaneous to reduce or disappear, the situation that loosening occurs, even comes off between connector greatly influences the reliable of connector work
Property.
The content of the invention
It is an object of the invention to provide a kind of nut and screw rod, can not only locking anticreep, and threaded connection after can
Dismounting.
To achieve these goals, the technical scheme that nut is used in the present invention is as follows.
A kind of nut, nut is provided with ring to be provided with cannula-like and its on thread segment, a stomidium inwall of thread segment
Connected in star, the aperture that the notch of groove is pointed on Kong Xin, the nut at the groove notch of precession direction front end is more than screw thread
Aperture at the nominal dimension of section or the groove notch of precession direction rear end is less than the nominal dimension of thread segment.
A kind of nut, nut is set respectively to be provided with cannula-like and its on thread segment, the two ends hole wall of the thread segment
Annular first and second groove is equipped with, the notch of groove is pointed at Kong Xin, the notch of annular first groove of precession direction front end
Aperture be more than the nominal dimension of thread segment, the aperture at the annular second groove notch of precession direction rear end is less than screw thread
The nominal dimension of section.
A kind of nut, nut is provided with projection to be provided with cannula-like and its on thread segment, one end hole wall of thread segment,
The projection of precession direction front end to Kong Xin distance are more than nominal dimension or the precession direction rear end of thread segment on the nut
Projection to Kong Xin distance are less than the nominal dimension of thread segment.
A kind of nut, nut is set respectively to be provided with cannula-like and its on thread segment, the two ends hole wall of the thread segment
First and second projection is equipped with, the first projection to the Kong Xin of the precession direction front end distance are more than the nominal dimension of thread segment, institute
The distance for stating the second projection to the Kong Xin of precession direction rear end is less than the nominal dimension of thread segment.
To achieve these goals, the technical scheme that screw rod is used in the present invention is as follows.
Have on a kind of screw rod, the shaft of screw rod and be provided with ring-type on thread segment, one end shaft outer peripheral face of the thread segment
The flange collar of precession direction front end to the distance of bar core is less than behind the nominal dimension of thread segment or precession direction on flange collar, the screw rod
The flange collar at end is more than the nominal dimension of thread segment to the distance of bar core.
Have on a kind of screw rod, the shaft of screw rod be respectively arranged with thread segment, the two ends shaft of thread segment ring-type first,
The first flange collar of precession direction front end is less than the nominal dimension of thread segment, the screw rod to the distance of bar core on two flange collars, screw rod
Second flange collar of upper precession direction rear end is more than the nominal dimension of thread segment to the distance of bar core.
Compared with prior art, technique effect of the invention is：During nut precession, the tube wall elasticity deformation of nut
So that the groove in flange collar and nut on screw rod coordinates, the inclined-plane of flange collar and the trough wall surface of groove against with limit nut pipe and
The upward relative position of screw shaft, so not only ensures the reliability of threaded connection, reaches significant locking anticreep effect, and
After threaded connection, nut and screw rod are dismantled by applying excessive power, this makes it possible to reuse, with cost-effective.
Brief description of the drawings
Fig. 1 a, 5a are the schematic diagram of screw rod embodiment one；
Fig. 1 b are the schematic diagram of nut embodiment one；
Fig. 1 c are the schematic diagram after Fig. 1 a and Fig. 1 b coordinate；
Fig. 2 is the enlarged diagram of structure at M in Fig. 1 c；
Fig. 3 a, 7a are the schematic diagram of screw rod embodiment two；
Fig. 3 b are the schematic diagram of nut embodiment two；
Fig. 3 c are the schematic diagram after Fig. 3 a and Fig. 3 b coordinate；
Fig. 4 a, 8a are the schematic diagram of screw rod embodiment three；
Fig. 4 b are the schematic diagram of nut embodiment three；
Fig. 4 c are the schematic diagram after Fig. 4 a and Fig. 4 b coordinate；
Fig. 5 b are the schematic diagram of nut example IV；
Fig. 5 c are the schematic diagram after Fig. 5 a and Fig. 5 b coordinate；
The schematic diagram that Fig. 6 amplifies for structure at N in Fig. 5 c；
Fig. 7 b are the schematic diagram of nut embodiment five；
Fig. 7 c are the schematic diagram after Fig. 7 a and Fig. 7 b coordinate；
Fig. 8 b are the schematic diagram of nut embodiment six；
Fig. 8 c are the schematic diagram after Fig. 7 a and Fig. 7 b coordinate.
Embodiment
It is described in further detail with reference to Fig. 1 to the 8 couples of present invention.
A kind of nut, nut 10 is provided with to be provided with cannula-like and its on thread segment, a stomidium inwall of thread segment
Annular groove 11,11 notch of groove points to the hole on Kong Xin, the nut 10 at the notch of groove 11 of precession direction front end
The aperture that footpath is more than at the notch of groove 11 of the nominal dimension of thread segment or precession direction rear end is less than the nominal dimension of thread segment.
A kind of nut, nut 10 is distinguished to be provided with cannula-like and its on thread segment, the two ends hole wall of the thread segment
Be provided with first and second annular groove 11A, 11B, the notch of groove 11 points to Kong Xin, precession direction front end it is first annular
Aperture at groove 11A notch is more than the nominal dimension of thread segment, the second annular groove 11B grooves of precession direction rear end
Aperture at mouthful is less than the nominal dimension of thread segment.
A kind of nut, nut 10 be cannula-like and its in be provided with thread segment, one end hole wall of thread segment be provided with it is convex
The projection 12 of precession direction front end to Kong Xin distance are more than nominal dimension or the precession side of thread segment on block 12, the nut 10
The projection 12 of rear end to Kong Xin distance are less than the nominal dimension of thread segment.
A kind of nut, nut 10 is distinguished to be provided with cannula-like and its on thread segment, the two ends hole wall of the thread segment
First and second projection 12A, 12B is provided with, the first projection 12A to Kong Xin of precession direction front end distance is more than thread segment
Nominal dimension, the second projection 12B to Kong Xin of precession direction rear end distance is less than the nominal dimension of thread segment.
Above-mentioned nut has six specific embodiments.
Embodiment one, as shown in Figure 1 b, precession direction front end sets fluted 11 on nut 10；
Embodiment two, as shown in Figure 3 b, precession direction rear end sets fluted 11 on nut 10；
Embodiment three, is respectively arranged with annular first and second recessed as shown in Figure 4 b, on nut 10 on the two ends hole wall of thread segment
Groove 11A, 11B；
Example IV, as shown in Figure 5 b, precession direction front end is provided with projection 12 on nut 10；
Embodiment five, as shown in Figure 7b, precession direction rear end is provided with projection 12 on nut 10；
Embodiment six, as shown in Figure 8 b, first and second projection is respectively arranged with nut 10 on the two ends hole wall of thread segment
12A、12B。
In order to ensure that nut 10 can coordinate with screw rod 20, as long as on nut 10 precession direction front end groove 11,
Then the aperture at its notch is more than the nominal dimension of thread segment；As long as the groove 11 in precession direction rear end, then at its notch
Aperture be less than thread segment nominal dimension.Similarly, projection 12 to the Kong Xin of precession direction front end distance are more than on nut 10
Second projection 12 of precession direction rear end to Kong Xin distance are less than the nominal of thread segment on the nominal dimension of thread segment, nut 10
Size.
The groove 11 is dovetail groove, on the groove 11 between the cell wall 111 and the tube wall of nut 10 of precession direction front end
Offer interior chamfering 13.During the precession of nut 10, interior chamfering 13 plays a part of guiding, is easy to nut 10 to cross screw rod 20
On flange collar 21.
The section overlapped on the projection 12 with hole cored wire is trapezoidal, and the projection 12 includes top surface 122, the top surface
Connected between 122 and the inside pipe wall of nut 10 by medial and lateral inclined-plane 121,123.The section overlapped on projection 12 with hole cored wire is in ladder
Shape, during the precession of nut 10, the medial slope 121 on projection 12 plays a part of guiding, is easy to the projection on nut 10
12 cross flange collar 21.
Have on a kind of screw rod, the shaft of screw rod 20 and be provided with ring on thread segment, one end shaft outer peripheral face of the thread segment
The flange collar 21 of precession direction front end is less than nominal dimension or the rotation of thread segment to the distance of bar core on shape flange collar 21, the screw rod 20
The flange collar 21 for entering direction rear end is more than the nominal dimension of thread segment to the distance of bar core.
There is that ring-type is respectively arranged with thread segment, the two ends shaft of thread segment on a kind of screw rod, the shaft of screw rod 20
First, the distance of first flange collar 21A of precession direction front end to bar core is less than the public affairs of thread segment on two flange collar 21A, 21B, screw rod 20
The distance of the second flange collar 21B to the bar core of precession direction rear end on size, the screw rod 20 is claimed to be more than the nominal dimension of thread segment.
Above-mentioned screw rod 20 has three specific embodiments.
Embodiment one, as shown in Fig. 1 a, 5a, precession direction rear end is provided with flange collar 21 on screw rod 20 and the flange collar 21 is to bar
The distance of core is more than the nominal dimension of thread segment；
Embodiment two, as shown in Fig. 3 a, 7a, precession direction front end is provided with flange collar 21 on screw rod 20 and the flange collar 21 is to bar
The distance of core is less than the nominal dimension of thread segment；
Embodiment three, as shown in Fig. 4 a, 8a, is respectively arranged with the of ring-type on the two ends shaft of thread segment on screw rod 20
First, two flange collar 21A, 21B.
As the concrete structure of flange collar 21, the section overlapped in the flange collar 21 with shaft core line is trapezoidal, the flange collar 21
Including top surface, connected between the shaft of top surface and screw rod 20 by inclined-plane.The section overlapped in flange collar 21 with shaft core line is trapezoidal,
So during the precession of nut 10, the inclined-plane of flange collar 21 plays a part of guiding, is easy to nut 10 to cross flange collar 21.
It should be noted that above-mentioned flange collar 21 can also be set to be interrupted shape, as long as ensureing matched groove 11 to connect
It is continuous.
In above-mentioned nut 10 and the embodiment of screw rod 20, the combination of nut 10 and screw rod 20 has six kinds, respectively as Fig. 1,
3rd, shown in 4,5,7 and 8.Illustrated with reference to the embodiment shown in Fig. 1, during the precession of nut 10, nut 10
The inclined-plane of interior chamfering 13 and flange collar 21 is reclined, and nut 10 continues precession, and the tube wall elasticity of nut 10 is deformed so that interior chamfering 13 is got over
Flange collar 21 is crossed, the flange collar 21 after the tube wall of nut 10 restores to the original state on screw rod 20 coordinates with the groove 11 on nut 10, flange collar 21
Inclined-plane and groove 11 trough wall surface 111 against to limit the relative position on nut 10 and the axial direction of screw rod 20, so not only protect
The reliability of threaded connection is demonstrate,proved, significant locking anticreep effect is reached, and after threaded connection, is torn open by applying excessive power
Removing nut 10 and screw rod 20, this makes it possible to reuse, with cost-effective.
Claims (9)
1. a kind of nut, it is characterised in that：Nut (10) be cannula-like and its in be provided with thread segment, a stomidium of thread segment
Annular groove (11) is provided with wall, the notch of (11) of groove points to precession direction front end on Kong Xin, the nut (10)
Aperture at groove (11) notch is more than the aperture at groove (11) notch of the nominal dimension of thread segment or precession direction rear end
Less than the nominal dimension of thread segment.
2. a kind of nut, it is characterised in that：Nut (10) be cannula-like and its in be provided with thread segment, the two ends of the thread segment
Annular first and second groove (11A, 11B) is respectively arranged with hole wall, the notch of groove (11) points to Kong Xin, the precession direction
Aperture at the notch of annular first groove (11A) of front end is more than the nominal dimension of thread segment, precession direction rear end
Aperture at annular second groove (11B) notch is less than the nominal dimension of thread segment.
3. a kind of nut, it is characterised in that：Nut (10) be cannula-like and its in be provided with thread segment, one end hole wall of thread segment
On be provided with the projection (12) of precession direction front end on projection (12), the nut (10) to Kong Xin distance and be more than thread segment
Nominal dimension or the projection (12) of precession direction rear end to Kong Xin distance are less than the nominal dimension of thread segment.
4. a kind of nut, it is characterised in that：Nut (10) be cannula-like and its in be provided with thread segment, the two ends of the thread segment
First and second projection (12A, 12B) is respectively arranged with hole wall, the first projection (12A) of precession direction front end is to Kong Xin's
Distance is more than the nominal dimension of thread segment, and the second projection (12B) to the Kong Xin of the precession direction rear end distance are less than screw thread
The nominal dimension of section.
5. nut according to claim 1 or 2, it is characterised in that：The groove (11) is dovetail groove, the groove (11)
Interior chamfering (13) is offered between the cell wall (111) and nut (10) tube wall of upper precession direction front end.
6. the nut according to claim 3 or 4, it is characterised in that：The section overlapped on the projection (12) with hole cored wire
Trapezoidal, the projection (12) includes top surface (122), by inside and outside skew back between the top surface (122) and nut (10) inside pipe wall
Face (121,123) is connected.
7. there is thread segment on a kind of screw rod, the shaft of screw rod (20), it is characterised in that：One end shaft outer peripheral face of the thread segment
On be provided with the flange collar (21) of precession direction front end on ring-type flange collar (21), the screw rod (20) to the distance of bar core and be less than screw thread
The nominal dimension of section or the flange collar (21) of precession direction rear end are more than the nominal dimension of thread segment to the distance of bar core.
8. there is thread segment on a kind of screw rod, the shaft of screw rod (20), it is characterised in that：Set respectively on the two ends shaft of thread segment
Have the first flange collar (21A) of precession direction front end on first and second flange collar (21A, 21B) of ring-type, screw rod (20) to bar core away from
From the nominal dimension less than thread segment, on the screw rod (20) the second flange collar (21B) of precession direction rear end to bar core distance
More than the nominal dimension of thread segment.
9. screw rod according to claim 8 or claim 9, it is characterised in that：The section overlapped on the flange collar (21) with shaft core line
Trapezoidal, the flange collar (21) includes top surface, is connected between the top surface and screw rod (20) shaft by inclined-plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710298629.2A CN107023556A (en) | 2017-04-27 | 2017-04-27 | Nut and screw rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710298629.2A CN107023556A (en) | 2017-04-27 | 2017-04-27 | Nut and screw rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107023556A true CN107023556A (en) | 2017-08-08 |
Family
ID=59528289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710298629.2A Pending CN107023556A (en) | 2017-04-27 | 2017-04-27 | Nut and screw rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107023556A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108825630A (en) * | 2018-06-12 | 2018-11-16 | 上海宝钢工业技术服务有限公司 | A kind of stop nut |
| CN109538884A (en) * | 2018-12-26 | 2019-03-29 | 国家电网有限公司 | Foundation bolt |
| CN110500434A (en) * | 2019-09-25 | 2019-11-26 | 江西鸥迪铜业有限公司 | A kind of spool for electric expansion valve |
| CN112031318A (en) * | 2020-07-31 | 2020-12-04 | 中国建筑标准设计研究院有限公司 | Interior decoration's wall structure |
| CN112982766A (en) * | 2021-03-03 | 2021-06-18 | 台州技创机械科技有限公司 | Keel connecting structure, matched tool and assembling and disassembling method thereof |
| CN113803346A (en) * | 2021-09-29 | 2021-12-17 | 航天精工股份有限公司 | Detachable anti-disassembly nut assembly |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4470735A (en) * | 1981-12-21 | 1984-09-11 | United Technologies Corporation | Self-locking bolt |
| JP3713413B2 (en) * | 2000-03-06 | 2005-11-09 | 日本ピラー工業株式会社 | Detachment prevention device for screw parts |
| CN202187997U (en) * | 2011-08-01 | 2012-04-11 | 贵州航天精工制造有限公司 | Anti-rotation rivet-turning type self-locking nut |
| CN103482210A (en) * | 2012-06-14 | 2014-01-01 | 王毅 | Anti-counterfeiting bottle cap and bottle mouth |
| CN204061492U (en) * | 2014-07-15 | 2014-12-31 | 北京汽车研究总院有限公司 | A kind of chek bolt, nut set |
| US20150135510A1 (en) * | 2013-11-18 | 2015-05-21 | Weatherford/Lamb, Inc. | Locking system for a threaded connection |
| CN204628216U (en) * | 2015-04-20 | 2015-09-09 | 安徽越天特种车桥有限公司 | Self-locking nut |
| CN206889449U (en) * | 2017-04-27 | 2018-01-16 | 合肥晟泰克汽车电子有限公司 | Nut and screw rod |
-
2017
- 2017-04-27 CN CN201710298629.2A patent/CN107023556A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4470735A (en) * | 1981-12-21 | 1984-09-11 | United Technologies Corporation | Self-locking bolt |
| JP3713413B2 (en) * | 2000-03-06 | 2005-11-09 | 日本ピラー工業株式会社 | Detachment prevention device for screw parts |
| CN202187997U (en) * | 2011-08-01 | 2012-04-11 | 贵州航天精工制造有限公司 | Anti-rotation rivet-turning type self-locking nut |
| CN103482210A (en) * | 2012-06-14 | 2014-01-01 | 王毅 | Anti-counterfeiting bottle cap and bottle mouth |
| US20150135510A1 (en) * | 2013-11-18 | 2015-05-21 | Weatherford/Lamb, Inc. | Locking system for a threaded connection |
| CN204061492U (en) * | 2014-07-15 | 2014-12-31 | 北京汽车研究总院有限公司 | A kind of chek bolt, nut set |
| CN204628216U (en) * | 2015-04-20 | 2015-09-09 | 安徽越天特种车桥有限公司 | Self-locking nut |
| CN206889449U (en) * | 2017-04-27 | 2018-01-16 | 合肥晟泰克汽车电子有限公司 | Nut and screw rod |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108825630A (en) * | 2018-06-12 | 2018-11-16 | 上海宝钢工业技术服务有限公司 | A kind of stop nut |
| CN109538884A (en) * | 2018-12-26 | 2019-03-29 | 国家电网有限公司 | Foundation bolt |
| CN110500434A (en) * | 2019-09-25 | 2019-11-26 | 江西鸥迪铜业有限公司 | A kind of spool for electric expansion valve |
| CN112031318A (en) * | 2020-07-31 | 2020-12-04 | 中国建筑标准设计研究院有限公司 | Interior decoration's wall structure |
| CN112982766A (en) * | 2021-03-03 | 2021-06-18 | 台州技创机械科技有限公司 | Keel connecting structure, matched tool and assembling and disassembling method thereof |
| CN113803346A (en) * | 2021-09-29 | 2021-12-17 | 航天精工股份有限公司 | Detachable anti-disassembly nut assembly |
| WO2023050604A1 (en) * | 2021-09-29 | 2023-04-06 | 航天精工股份有限公司 | Detachable anti-disassembly nut assembly |
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