CN109083917A - Dual locking absorbing type self-locking nut - Google Patents

Dual locking absorbing type self-locking nut Download PDF

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Publication number
CN109083917A
CN109083917A CN201811264969.4A CN201811264969A CN109083917A CN 109083917 A CN109083917 A CN 109083917A CN 201811264969 A CN201811264969 A CN 201811264969A CN 109083917 A CN109083917 A CN 109083917A
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China
Prior art keywords
absorbing
nut
lower body
screw thread
friction
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CN201811264969.4A
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CN109083917B (en
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魏民
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00Locking of screws, bolts or nuts
    • F16B39/02Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/10Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
    • F16B39/103Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt with a locking cup washer, ring or sleeve surrounding the nut or bolt head and being partially deformed on the nut or bolt head, or on the object itself
    • F16B39/105Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt with a locking cup washer, ring or sleeve surrounding the nut or bolt head and being partially deformed on the nut or bolt head, or on the object itself locking the bold head or nut into a hole or cavity, e.g. with the cup washer, ring or sleeve deformed into a dimple in the cavity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00Locking of screws, bolts or nuts
    • F16B39/02Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/12Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

A kind of the problems such as dual locking absorbing type self-locking nut, the nut for solving existing bolt assembly is not able to satisfy locking requirement, reduces nut reuse rate.Including internal screw thread it is identical with the external screw thread for matching attachment bolt on, lower body, it is characterized in that: being provided with friction absorbing pad between the upper surface and upper body eccentric orfice inner cavity of lower body bias boss, the friction rebasing face of absorbing is with the upper surface of lower body bias boss using the conical surface to match, friction absorbing ring is provided between lower body bias boss periphery and the annular groove of upper body eccentric orfice inner circumferential, it is provided with the upper body internal screw thread marked with one heart and is provided with the lower lower body internal screw thread marked with one heart, in the initial state on the same axis with attachment bolt external screw thread, on and, lower label with one heart is overlapped.Its structure is simple, and design rationally, significantly increases anti-loosing effect, not only handling ease, convenient for disassembly and assembly, raising nut reuse rate, but also meets the strict demand that screamer prevents threaded connection from loosening.

Description

Dual locking absorbing type self-locking nut
Technical field
The present invention relates to a kind of stop nut of bolt assembly, especially one kind, and generation gold can be matched with attachment bolt Belong to the dual locking absorbing type self-locking nut with anti-loosing effects such as metal, nonmetallic and metals.It is mainly used for some and bolt The mechanical equipment that the needs that component matches strictly prevent the important spare part of nut loosening from connecting.
Background technique
The bolt assembly that the fastener of usual mechanical equipment thread connection is made of bolt, nut, washer etc., main function Can realize components connection.It is existing but in the mechanical equipment for needing strictly to prevent the important spare part of nut loosening from connecting There is the stop nut matched used in conventional anti-loose method with bolt assembly, is difficult to meet the anti-of important spare part connection Pine requires.
Currently, to solve the above-mentioned problems, occurring some utilization double nuts in succession and combining anti-loose structure, such as special Disclosed in the documents such as sharp GB1547585, DE364066825, FR 1.217.394, EP0362132A1,2003-42128A Technology contents.But find that these structures there is also some problems in use: one is not being avoided that nut when implementing locking Biggish additional axial stress is generated to attachment bolt;The second is not being able to satisfy bolt assembly in vibration alternation, frequency height, intensity Greatly, the locking requirement of the operating conditions such as period length.A kind of cylinder opened up using nut lower end is disclosed in JP 2007-211892A Hole, conical bore link together washer, deformable strip portion frustum thin walled cylinder body, form Combined locknut component.Due to it Main locking design is realized by the deformation of deformable strip portion frustum thin walled cylinder body, and band frustum thin walled cylinder body is necessary at work It is deformed, so the variation of this nut and deformable strip portion frustum thin walled cylinder body axial distance, will directly influence nut and prevent Loose effect.A kind of stop nut with upper and lower body structure is also disclosed in GB 122272A, it is inclined using nut upper body lower end Cardiac prominence platform, lower body upper end eccentric orfice and eccentric bore ends cone cell deform boss, upper body lower end bias boss root notches, implementation group It is box-like locking.Because the nut upper and lower body coefficient of friction is designed unreasonable factors and is influenced by the limitation of its material and axial arrangement, It causes primary clearance not know equal influence, therefore cannot achieve that mend tight nut upper body automatically using nut lower body loose moment self-locking Torque, while also certain difficulty is caused to the nut inner thread overall processing.
The applicant once designed " self-locking nut " and Publication No. CN103277392A that notification number is CN2818887Y " Accentric self locking nut ", substantially solved the problems such as anti-slow, intensity is insufficient existing for existing nut anti-looseness.It is basic herein Upper " Accentric self locking nut " for having devised Publication No. CN1987133A again.Its main technical content recorded is: in spiral shell Self-locking ring is assembled above maternal body, and is kept relationship between " axial distance " and lead of screw thread and implemented using nut loosening torque It is automatic to mend tightly.It also proposed and " be provided between the frustum end with frustum thin walled cylinder body and nut upper body eccentric orfice by non-simultaneously The technical measures such as damping lantern ring made of metal material or metal material ", this improves anti-loosing effects.But because in reality It is found in, " damping ring " is influenced by installation site, connection structure etc., and when bearing axial compressive force, deformation direction is uncertain, It not can effectively prevent, absorb nut upper and lower body axial direction, radial vibration transmitting.Especially when nut is reused, it not can guarantee Upper and lower body connection initial frictional is constant, reduces nut and reuses efficiency.
Summary of the invention
The object of the present invention is to provide a kind of dual locking absorbing type self-locking nuts, it efficiently solves existing bolt assembly Nut the problems such as not being able to satisfy locking requirement, reducing nut reuse rate, structure is simple, and design rationally, significantly increases Anti-loosing effect, not only handling ease, it is convenient for disassembly and assembly, improve nut reuse rate, but also meet screamer and prevent It is threadedly coupled the strict demand loosened.
The technical scheme adopted by the invention is that: the dual locking absorbing type self-locking nut include top be provided with it is eccentric convex The lower body of platform, lower part are provided with the upper body of eccentric orfice, and the internal screw thread of upper and lower body is identical as the external screw thread for matching attachment bolt, It is characterized in that: being provided with nonmetallic materials between the upper surface and upper body eccentric orfice inner cavity of the lower body bias boss and be made Friction absorbing pad, the upper surface that is in contact with lower body bias boss of the friction rebasing face of absorbing using the conical surface mutually coincideing, when When upper body is padded with respect to lower body rotational angle alpha axial direction pressing friction absorbing, the deformation direction of friction absorbing pad is directed toward always to be contacted Attachment bolt surface, be provided with nonmetallic materials between lower body bias boss periphery and the annular groove of upper body eccentric orfice inner circumferential Manufactured friction absorbing ring is provided with the upper body internal screw thread marked with one heart and is provided with the lower lower body internal screw thread marked with one heart, In the initial state on the same axis with attachment bolt internal screw thread, and upper and lower label with one heart is overlapped.
Annular cone table, ring is made using the nonmetallic materials that coefficient of friction is big, shock attenuation result is good in the friction absorbing pad The internal diameter of shape cone table and the outer diameter of attachment bolt are identical.
The present invention has the advantage that and good effect is: since the dual locking absorbing type self-locking nut (is hereinafter referred to as inhaled Shake nut, for distinguishing other self-locking nuts) lower body bias boss upper surface and upper body eccentric orfice inner cavity between be provided with Rub absorbing pad made of nonmetallic materials, and the upper surface that the friction rebasing face of absorbing is in contact with lower body bias boss is using mutual The identical conical surface is provided with nonmetallic materials between lower body bias boss periphery and the annular groove of upper body eccentric orfice inner circumferential and is made Friction absorbing ring, so its structure is simple, design rationally, significantly increases anti-loosing effect, not only handling ease, it is convenient for disassembly and assembly, Nut reuse rate is improved, and meet screamer to prevent from being threadedly coupled the strict demand loosened.Its reason is just Be: absorbing nut uses above-mentioned unique structure, and in the initial state, upper and lower body internal thread hole is concentric;Implement locking When, upper body causes upper body threaded interior hole eccentric with respect to lower body threaded interior hole with respect to lower body rotational angle α, and axial compression friction is inhaled Vibration pad generates flexible deformation, because the deformation direction of friction absorbing pad is directed toward contacted attachment bolt surface always, therefore increases pair Attachment bolt radial pressure improves absorbing nut anti-looseness effect, has also blocked the axially vibrated transmitting of upper and lower body, and effectively Absorb the axial high-frequency vibration acted on upper and lower body;Simultaneously under the action of eccentricity a, friction absorbing ring is along bias side Flexible deformation is generated to local compression, not only increases absorbing nut frictional force, friction absorbing ring has also blocked upper and lower body along diameter It is transmitted to vibration, absorbing nut just generates double rub power to attachment bolt, effectively prevent absorbing nut loosening.Because effectively absorbing Act on the radial high-frequency vibration on upper and lower body, it is ensured that absorbing nut implement it is locking after, frequency no matter is vibrated between upper lower body How rate changes, and does not occur to loosen relatively, and guaranteeing absorbing nut, initially locking frictional force is constant, therefore can further be promoted locking Effect.Another effect of friction absorbing ring is, it is ensured that when absorbing nut is reused, upper lower body connection frictional force is constant.Cause This, the nut that the present invention efficiently solves existing bolt assembly is not able to satisfy locking requirement, reduces nut reuse rate etc. and asks Topic.
Detailed description of the invention
Below in conjunction with attached drawing, the invention will be further described.
Fig. 1 is a kind of structural schematic diagram of the invention;
Fig. 2 is a kind of structural schematic diagram of upper body in Fig. 1:
Fig. 3 is a kind of structural schematic diagram of friction absorbing ring in Fig. 1:
Fig. 4 is a kind of structural schematic diagram of friction absorbing pad in Fig. 1:
Fig. 5 is a kind of structural schematic diagram of lower body in Fig. 1.
Number explanation in figure: 1 upper body, label, 3 lower labels with one heart, 4 lower bodies, 5 friction absorbing rings, 6 friction suctions with one heart on 2 Shake pad, 7 eccentric orfices, 8 annular grooves, 9 eccentric boss, a eccentricity, rotational angle α.
Specific embodiment
According to Fig. 1~5 specific structure that the present invention will be described in detail.The dual locking absorbing type self-locking nut includes that top is set It is equipped with the lower body 4 of eccentric boss 9, lower part is provided with the upper body 1 of eccentric orfice 7, zero, friction absorbing pad 6 and friction absorbing ring 5 etc. Part.Upper body 1, the internal screw thread of lower body 4 are identical as the external screw thread for matching attachment bolt (not shown).Wherein rub absorbing pad 6 are made annular cone table using coefficient of friction is big, shock attenuation result is good nonmetallic materials, the internal diameter of annular cone table with couple spiral shell The outer diameter of bolt is identical.Between 7 inner cavity of upper surface and 1 eccentric orfice of upper body of the eccentric boss 9 of lower body 4, it is provided with nonmetallic materials system At friction absorbing pad 6, friction absorbing pads upper surface that the eccentric boss 9 of 6 bottom surfaces and lower body 4 is in contact using the cone mutually coincideing Face.When upper body 1 is with respect to 4 rotational angle alpha axial direction pressing friction absorbing of lower body pad 6, the deformation direction of friction absorbing pad 6 refers to always To the attachment bolt surface contacted.In order to fully absorb radial vibration, in eccentric 9 periphery of boss of lower body 4 and 1 eccentric orfice of upper body The absorbing ring 5 that rubs made of nonmetallic materials is provided between the annular groove 8 of 7 inner circumferentials.It is provided with the upper body 1 of concentric label 2 Internal screw thread and 4 internal screw thread of lower body for being provided with lower concentric label 3, in the initial state with attachment bolt external screw thread in same axis On, and upper and lower label 2,3 with one heart is overlapped (as shown in Figure 1).
When the absorbing nut practical application, the main function that above structure is connected and fixed has at 2 points: first is that generating centainly Initial frictional is easy to use with guaranteeing not relatively move between the upper and lower body 1,4 using preceding original state;Second is that It prevents and absorbs the transmitting from radial vibration energy.The setting of axial rub absorbing pad 6 eccentric 9 upper surface of boss of lower body 4 with Between 1 eccentric orfice of upper body, 7 inner cavity, and guarantee is completely closely connected, holds connection spiral shell tightly to realize absorbing nut under responsive to axial force The function of bar, axial rub absorbing pad 6 and 9 upper surface of the eccentric boss of lower body 4 are arranged to " annular cone table ".Just because of this, The main function that axial rub absorbing pad 6 generates has at 2 points: first is that implement absorbing nut check it is locking when, in axial force and Under " annular cone table " effect, the deformation direction of axial rub absorbing pad 6 is directed toward absorbing nut center, holds screw connection tightly, increases The anti-loosing effect of absorbing nut is added;Second is that preventing and absorbing the transmitting from axial vibration energy.
Radial friction absorbing ring 5 and 1 eccentric orfice 7 of upper body are concentric, are interference fitted with eccentric 9 outer diameter of boss of lower body 4, axially rub It wipes absorbing pad 6 and 1 eccentric orfice 7 of upper body is closely connected, internal threaded hole is concentric up and down for internal thread hole and nut, same to size.
In the initial state, absorbing nut upper body 1, lower body 4, axial rub absorbing pads that 6 internal thread holes are concentric, same to size, It at this point, absorbing nut and plain nut are just the same, manually can easily screw on the attachment bolt of identical dimensions, implement Screwing operation.When needing to implement absorbing nut anti-looseness, by the upper body 1 of absorbing nut with respect to lower body 4, nut side is tightened on edge To one angle [alpha] of rotation., at this point, following variation will occur for absorbing nut: lower body is axially move closer to outer gap subtracts on one It is small;Secondly internal threaded hole occurs eccentric up and down, radial pressure is generated to screw connection, increase up and down internal screw thread with couple Screw rod frictional force;Thirdly axial rub absorbing pad 6 is compressed, screw connection is held tightly under " annular cone table " effect, increase rubs Wipe power;Four under eccentric force effect, with the eccentric boss 9 of lower body 4 bias occurs for 1 eccentric orfice 7 of upper body, and compresses along eccentric direction for it Radial friction absorbing ring 5 increases by 1 eccentric orfice 7 of upper body and 9 frictional force of eccentric boss of lower body 4.
Implement locking principle for scientific analysis absorbing nut, sets body 4 and screw connection frictional force as F1, upper body 1 and connection It connects that screw rod frictional force is F2, upper body eccentric orfice 7 and 9 frictional force of lower body bias boss are F3, then there is the relationship of " F1 > F2 > F3 ". Therefore, when lower body 4 loosens, upper body cannot be driven to loosen together by F3, causes lower body 4 with respect to upper body 1 along release spiral shell Maternal, that is, upper body 1 has rotated an angle along nut direction is tightened with respect to lower body 4, is increased to an angle is turned over The anti-loosening locking torque of absorbing nut.
The absorbing nut be it is improved in the structure basis of " Accentric self locking nut " (CN103277392B), the two Important difference is: (1) absorbing nut, which utilizes, is placed among eccentric 9 upper surface of boss of lower body 4 and 1 eccentric orfice of upper body, 7 lower end surface Axial rub absorbing pad 6, absorb, isolation lower body vibration on the absorbing nut is implemented along transfers, and in absorbing nut When locking, the effect of 6 directional deformations is padded using axial rub absorbing and holds screw connection tightly, increases absorbing nut anti-looseness ability;(2) it inhales Vibration nut is provided with radial friction absorbing ring 5 in the lower end of 1 eccentric orfice 7 of upper body, increases lower body connection friction on absorbing nut Power, meanwhile, it absorbs, isolation is radially transmitted from lower body vibration on absorbing nut.
In order to clearly mark the installation direction of absorbing nut, along vertical eccentric direction, corresponding upper and lower label 2,3 with one heart Parallel surface punch mark " arrow " or label " triangle " etc., the upper and lower concentric label 2,3 of " arrow " or " triangle " will be stamped with It is overlapped to just, after absorbing nut is concentric, can be used as plain nut use.
Under eccentricity a and rotational angle α effect, following four variation will occur for absorbing nut interior: one, in bias Away under a effect, upper body 1,4 internal screw thread of lower body are improved along eccentric direction and, to the radial forces of attachment bolt, increases absorbing spiral shell Female frictional force with attachment bolt binding site;Two, under eccentricity a effect, eccentric boss 9 is with eccentric orfice 7 along eccentric direction Active force increases, and increases upper body 1, the 4 junction frictional force of lower body of absorbing nut;Three, under rotational angle α effect, upper body 1 Opposite lower body 4 is relatively moved along axial, is increased friction absorbing and is padded 6 axial compressive forces, acts in eccentric 9 tapered surface of boss Under, friction absorbing pad 6 orients flexible deformation, increases to attachment bolt thread surface radial pressure, improves absorbing nut Anti-loosing effect;Four, under eccentricity a effect, eccentric 9 relative eccentric hole 7 of boss makes the absorbing that rubs along eccentric direction radial direction micro-shifting Along eccentric direction elastomeric radial locally occurs for ring 5, increases upper body 1, the 4 junction frictional force of lower body of absorbing nut.
Because of the material manufacture that friction absorbing pad 6, friction absorbing ring 5 have selected shock attenuation result good, make upper body 1 and lower body 4 not Vibration can be transmitted axially, radially, it is ensured that absorbing nut anti-looseness effect.
For ease of assembly and disassembly, prevent the installation of absorbing nut reversed, therefore in 1 lower body of upper body, 4 outer peripheral surface provided with mutually right The upper and lower concentric label 2,3 answered.When needing to dismantle absorbing nut, as long as by upper body 1 with respect to lower body 4 along release absorbing nut Direction go back to initial position, so that it may be aligned the upper and lower concentric label 2,3 of upper body 1,4 outer peripheral surface of lower body, it is ensured that upper body 1, under 4 internal thread hole of body restores with one heart, to eliminate absorbing nut to attachment bolt radial pressure and frictional force.
Since friction absorbing ring 5 is matched with eccentric boss 9,7 inner surface annular groove 8 of eccentric orfice using interference in initial installation Installation is closed, it is ensured that upper body 1, lower body 4 have the enough connection frictional force for meeting the self-locking needs of absorbing nut, meanwhile, It can guarantee absorbing nut when reusing, upper body 1, the connection of lower body 4 frictional force are constant.

Claims (2)

1. a kind of dual locking absorbing type self-locking nut, the lower body of eccentric boss is provided with including top, lower part is provided with bias The upper body in hole, the internal screw thread of upper and lower body are identical as the external screw thread for matching attachment bolt, it is characterised in that: the lower body is eccentric The absorbing pad that rubs made of nonmetallic materials is provided between the upper surface and upper body eccentric orfice inner cavity of boss, friction absorbing is rebasing The upper surface that face is in contact with lower body bias boss is using the mutually identical conical surface, when upper body is with respect to lower body rotational angle alpha axial direction When pressing friction absorbing is padded, the deformation direction of friction absorbing pad is directed toward contacted attachment bolt surface always, in lower body bias It is provided with the absorbing ring that rubs made of nonmetallic materials between boss periphery and the annular groove of upper body eccentric orfice inner circumferential, is provided with The upper body internal screw thread that marks with one heart and be provided with the lower lower body internal screw thread marked with one heart, in the initial state with spiral shell outside attachment bolt Line on the same axis, and marks with one heart be overlapped above and below.
2. dual locking absorbing type self-locking nut according to claim 1, it is characterised in that: the friction absorbing pad uses The nonmetallic materials that coefficient of friction is big, shock attenuation result is good are made annular cone table, the internal diameter of annular cone table and attachment bolt Outer diameter is identical.
CN201811264969.4A 2018-10-29 2018-10-29 Double anti-loose vibration-absorbing self-locking nut Active CN109083917B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811264969.4A CN109083917B (en) 2018-10-29 2018-10-29 Double anti-loose vibration-absorbing self-locking nut

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Application Number Priority Date Filing Date Title
CN201811264969.4A CN109083917B (en) 2018-10-29 2018-10-29 Double anti-loose vibration-absorbing self-locking nut

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CN109083917B CN109083917B (en) 2024-05-24

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1011697A (en) * 1964-07-06 1965-12-01 Briles Franklin S Nut and washer assembly
JPH10141349A (en) * 1996-11-14 1998-05-26 Haadorotsuku Kogyo Kk Locking nut and manufacture thereof
US6786690B1 (en) * 2002-06-19 2004-09-07 Fusao Yamada Locking fastener
CN2654930Y (en) * 2003-11-20 2004-11-10 云南省机械研究设计院 Wire retainer ring clamping head locking nut assembly
CN1844684A (en) * 2006-05-08 2006-10-11 张连墩 Shockproof locknut capable of positioning and automatically enhancing self-locking strength when securing
CN102691842A (en) * 2012-06-19 2012-09-26 柳州博泽科技有限公司 Pipeline quick connection device
CN102889439A (en) * 2011-07-21 2013-01-23 贵州工信机电科技有限公司 Hydraulic pipe joint sleeve
CN203532477U (en) * 2013-10-12 2014-04-09 黄龙梅 Eccentric type self-locking locknut
CN208935135U (en) * 2018-10-29 2019-06-04 魏民 Dual locking absorbing type self-locking nut

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1011697A (en) * 1964-07-06 1965-12-01 Briles Franklin S Nut and washer assembly
JPH10141349A (en) * 1996-11-14 1998-05-26 Haadorotsuku Kogyo Kk Locking nut and manufacture thereof
US6786690B1 (en) * 2002-06-19 2004-09-07 Fusao Yamada Locking fastener
CN2654930Y (en) * 2003-11-20 2004-11-10 云南省机械研究设计院 Wire retainer ring clamping head locking nut assembly
CN1844684A (en) * 2006-05-08 2006-10-11 张连墩 Shockproof locknut capable of positioning and automatically enhancing self-locking strength when securing
CN102889439A (en) * 2011-07-21 2013-01-23 贵州工信机电科技有限公司 Hydraulic pipe joint sleeve
CN102691842A (en) * 2012-06-19 2012-09-26 柳州博泽科技有限公司 Pipeline quick connection device
CN203532477U (en) * 2013-10-12 2014-04-09 黄龙梅 Eccentric type self-locking locknut
CN208935135U (en) * 2018-10-29 2019-06-04 魏民 Dual locking absorbing type self-locking nut

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