WO2014125514A1 - Système de protection contre le dévissage à frottement pour boulons - Google Patents

Système de protection contre le dévissage à frottement pour boulons Download PDF

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Publication number
WO2014125514A1
WO2014125514A1 PCT/IT2014/000033 IT2014000033W WO2014125514A1 WO 2014125514 A1 WO2014125514 A1 WO 2014125514A1 IT 2014000033 W IT2014000033 W IT 2014000033W WO 2014125514 A1 WO2014125514 A1 WO 2014125514A1
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WO
WIPO (PCT)
Prior art keywords
screw
nut
unscrewing
reduction
cylindrical
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.)
Ceased
Application number
PCT/IT2014/000033
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English (en)
Inventor
Michele Eramo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2014125514A1 publication Critical patent/WO2014125514A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • F16B39/284—Locking by means of elastic deformation
    • 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
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
    • F16B39/126—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts causing radial forces on the bolt-shaft
    • 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

Definitions

  • the present invention refers to an unscrewing- preventing system for bolts.
  • the invention finds its application in the field of mechanics.
  • a bolt is a component composed of a screw (head with threaded stem) and a nut with a corresponding thread.
  • the nut usually with an hexagonal shape, is screwed on the stem of the screw to mutually connect parts to be assembled.
  • the nut tends to be loosened, so that several solutions are used, among which the addition of a lock nut.
  • Figure 1.1 shows the prior art situation with nut and lock nut
  • Figures 2.1 to 4.1 show embodiments with a high nut with tightening action on the screw reductions .
  • Figures 1.2 to 4.2 show embodiments with nut and lock nut with tightening action on the screw reductions;
  • Figure 5.2 shows an embodiment with special nut and lock nut with tightening action on the screw reduction .
  • Figures 1.3 and 2.3 show embodiments with a nut with tightening action on the reductions of a screw with biting catch
  • Figure 3.3 shows an embodiment with a high nut with tightening action on the reductions of a screw with biting catch
  • Figure 4.3 shows an embodiment with a nut with tightening action on the reduction of a screw with biting catch (and tightening action on the stem of the under-head)
  • Figure 5.3 shows an embodiment with special nut and lock nut with tightening action on the reduction of a screw with biting catch.
  • Figure 1.4 shows an embodiment with special nut and lock nut with tightening action between the reduction of the former and the chamber of the latter;
  • Figure 2.4 shows an embodiment with special nut and lock nut with tightening action on the screw reduction and on a deformable insert with pliers effect on the screw stem;
  • Figure 3.4 shows an embodiment with a nut with tightening action on a deformable flanged insert with pliers effect on the screw stem and a lock nut;
  • Figure 4.4 shows an embodiment with special nut and lock nut with tightening action on the screw reduction;
  • Figure 5.4 shows an embodiment with a high nut with tightening action on the screw and lock nut reductions.
  • the invention deals with unscrewing-preventing systems for bolts (of the simple use or biting catch types) in which the male has a single or double threading; has deformable inserts and reductions with tightening functions and, in the mentioned cases, uses special nuts.
  • Figure 1.1 shows the prior art situation with a screw (1) , a nut (2) and a lock nut (3) .
  • Figure 2.1 shows a screw (1) with a cylindrical reduction chamfered at its end; an oriented nut (2) with its threaded part biting and equipped with a through-hole which is coupled with the screw reduction.
  • the unscrewing-preventing action is obtained by the friction existing in this cylindrical coupling (3) , where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 3.1 shows a screw (1) and a high oriented nut (2) with the threaded part preceded by a cylindrical chamber whose diameter is bigger than the thread crests, but such as to obtain a locking condition on the screw stem.
  • the unscrewing-preventing action is obtained by the friction existing in this cylindrical coupling (3), where male and female comply with the working tolerances suitable for an adequate driving .
  • Figure 4.1 shows a screw (1) with a cylindrical reduction chamfered at its end ; a high and oriented nut (2) with its central part preceded by a cylindrical chamber, whose diameter is bigger than the thread crests, but such as to obtain a locking condition on the screw stem and followed by a cylindrical through- reduction which is coupled with the male reduction.
  • the unscrewing-preventing action is obtained by the friction existing in this double cylindrical coupling (3), where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 1.2 shows a screw (1) with a cylindrical reduction chamfered at its end; a nut (2) ; a high and oriented lock nut (3) with its threaded part having a cylindrical through-reduction which is coupled with the screw reduction.
  • the unscrewing-preventing action is obtained by the friction existing in this cylindrical coupling (4) , where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 2.2 shows a screw (1) with a cylindrical reduction whose diameter is not bigger than the screw core and a further threaded reduction; a nut (2); an oriented lock nut (3) with its threaded part preceded by a cylindrical chamber which is coupled with the intermediate cylindrical section of the screw.
  • the unscrewing-preventing action is obtained by the friction existing in this cylindrical coupling (4), where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 3.2 shows a screw (1) with a cylindrical reduction chamfered at its end; an oriented nut (2) with its threaded part preceded by a cylindrical chamber whose diameter is bigger than the thread crests, but such as to obtain a locking condition on the screw stem; an oriented lock nut (3) with its threaded part having a cylindrical through-reduction which is coupled with the cylindrical screw reduction.
  • the unscrewing-preventing action is obtained by the friction existing in this double cylindrical coupling (4) (5) , where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 4.2 4 shows a screw (1) with a cylindrical reduction whose diameter is not bigger than the screw core and a further threaded reduction; an oriented nut (2) with non-threaded section (collar) which is coupled with the intermediate cylindrical section of the screw in order to obtain a blocking condition; an oriented lock nut (3) with its threaded part preceded by a cylindrical chamber which is coupled with the intermediate cylindrical section of the screw in order to obtain a blocking condition.
  • the unscrewing- preventing action is obtained by the friction existing in this double cylindrical coupling (4) (5), where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 5.2 shows a screw (1) with a cylindrical reduction chamfered at its end; an oriented nut (2) with an externally threaded reduction; a lock nut (3) with threaded chamber which engages the external thread of the nut and which goes in with a cylindrical through-hole coupled with the screw reduction.
  • the unscrewing-preventing action is obtained by the friction existing in this cylindrical coupling (4) , where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 1.3 shows a screw with biting catch (1) with a cylindrical reduction chamfered at its end; an oriented nut (2) with its threaded part and a cylindrical through-reduction which is coupled with the screw reduction.
  • the unscrewing-preventing action is obtained by the friction existing in this cylindrical coupling (3) , where male and female comply with the working tolerances suitable for an adequate driving.
  • Section a shows an alternative solution in which the same unscrewing-preventing action is directly performed on the part to be assembled.
  • Figure 2.3 shows a screw with biting catch (1) with a cylindrical reduction whose diameter is not bigger than the screw core and a further threaded reduction; an oriented nut (2) with its threaded part preceded by a cylindrical chamber which is coupled with the intermediate cylindrical section of the screw.
  • the unscrewing-preventing action is obtained by the friction existing in this cylindrical coupling (3) , where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 3.3 shows a screw with biting catch (1) with an intermediate cylindrical reduction whose diameter is not bigger than the screw core, a further threaded reduction and a last cylindrical reduction chamfered at its end; a high oriented nut (2) with its threaded part preceded by a cylindrical chamber which is coupled with the intermediate cylindrical section of the screw and a second cylindrical section which is coupled with the last screw reduction.
  • the unscrewing- preventing action is obtained by the friction existing in this double cylindrical coupling (3) (4), where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 4.3 shows a screw with biting catch (1) with a section under the head with forced assembling tolerances and with a cylindrical reduction chamfered at its end; an oriented nut (2) with its threaded part and a cylindrical through-reduction which is coupled with the cylindrical screw reduction.
  • the unscrewing- preventing action is obtained by the friction existing in this double cylindrical coupling (3) (4), where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 5.3 shows a screw with biting catch (1) with a cylindrical reduction chamfered at its end; an oriented nut (2) with an externally threaded reduction; a lock nut (3) with threaded chamber which engages the external thread of the nut and which goes on with a cylindrical through-hole coupled with the screw reduction.
  • the unscrewing-preventing action is obtained by the friction existing in this cylindrical coupling (4) , where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 1.4 shows a screw (1); an oriented nut (2) with a cylindrical reduction on its hexagonal section; a lock nut (3) with a cylindrical chamber which is coupled with the cylindrical reduction of the nut.
  • the unscrewing-preventing action is obtained by the friction existing in this cylindrical coupling (4), where male and female comply with the working tolerances suitable for an adequate driving.
  • Figure 2.4 shows a screw (1) with a cylindrical reduction chamfered at its end; an oriented nut (2) which has an externally threaded reduction and an internal chamber below; a deformable bush (4) constrained between screw reduction and nut chamber under the screwing thrust of the lock nut (3) , whose threaded chamber gets engaged with the external thread of the nut and goes on with a through-hole being coupled with the screw reduction.
  • the unscrewing- preventing action is obtained by the friction (6) following the driving of the bush and the friction (5) existing in the cylindrical coupling (5) between screw and lock nut, where male and female comply with the working tolerances suitable for an adequate driving.
  • Section a is an alternative solution in which the deformable insert is composed of a flanged bush.
  • Figure 3.4 shows a screw (1), an oriented nut (2) with its threaded part, and a cylindrical chamber on its opposite side; a deformable flanged insert (4) constrained between cylindrical screw reduction, nut and lock nut (3) .
  • the unscrewing-preventing action is obtained by tightening the insert between the faces (6) of nut and lock nut, and by the friction (5) created in compressing the insert between screw reduction and nut chamber, since the working tolerances are suitable for an adequate driving.
  • Figure 4.4 shows the screw (1) with a cylindrical reduction chamfered at its end; a high oriented nut (2) with a read threaded chamber; a screw-type plug (3) with cylindrical recess adapted to be forced on the screw reduction.
  • the unscrewing-preventing action is obtained by the friction existing in this coupling (4), where male and female comply with the working tolerances for an adequate driving.
  • Figure 5.4 shows a screw (1); a high and symmetrical nut which has two chamber with forced couplings; a counter-screw (3) with a cylindrical section under the head.
  • the unscrewing-preventing action is obtained by frictions existing in this double coupling (5) , where males and females comply with the working tolerances suitable for an adequate driving.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Vehicle Body Suspensions (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

La présente invention concerne un système de protection contre le dévissage, comprenant, en série, une vis (1) présentant des réductions et un écrou (2) doté de chambres de serrage pour tige et des réductions de vis, la vis (1) présentant une réduction cylindrique non filetée chanfreinée à son extrémité opposée par rapport à sa tête, et l'écrou (2) étant intérieurement composé d'une partie filetée et d'au moins une partie lisse en vue d'un accouplement correspondant avec la vis (1) et d'une action de protection contre le dévissage obtenue par un frottement existant entre les parties non filetées de la vis (1) et de l'écrou (2).
PCT/IT2014/000033 2013-02-14 2014-02-05 Système de protection contre le dévissage à frottement pour boulons Ceased WO2014125514A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITAT2013A000001 2013-02-14
IT000001A ITAT20130001A1 (it) 2013-02-14 2013-02-14 Sistemi di antisvitamento con attrito per bulloni

Publications (1)

Publication Number Publication Date
WO2014125514A1 true WO2014125514A1 (fr) 2014-08-21

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ID=47989328

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Application Number Title Priority Date Filing Date
PCT/IT2014/000033 Ceased WO2014125514A1 (fr) 2013-02-14 2014-02-05 Système de protection contre le dévissage à frottement pour boulons

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IT (1) ITAT20130001A1 (fr)
WO (1) WO2014125514A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016092572A1 (fr) * 2014-12-11 2016-06-16 Michele Eramo Systèmes anti-dévissage par friction pour des boulons
CN116292577A (zh) * 2021-12-09 2023-06-23 刘应龙 一种螺纹连接的紧固、防松方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539213A (en) * 1923-03-29 1925-05-26 Shaw George Means for locking nuts upon bolts
GB348445A (en) * 1929-07-04 1931-05-14 Ludwig Strober Improvements in nut-locks
US4983084A (en) * 1989-09-26 1991-01-08 Northrop Corporation Double locked threaded fastener

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB238487A (en) * 1925-04-04 1925-08-20 Hubert Dollman Improvements in lock nuts
US3317228A (en) * 1966-04-11 1967-05-02 Federal Screw Works Taper bolt assembly
US5562379A (en) * 1994-02-16 1996-10-08 Hi-Shear Corporation Vibration resistant pin and collar fastener
US5669746A (en) * 1996-08-12 1997-09-23 Fairchild Holding Corp. Fastener having spiral shaped collar portion
US6786690B1 (en) * 2002-06-19 2004-09-07 Fusao Yamada Locking fastener

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539213A (en) * 1923-03-29 1925-05-26 Shaw George Means for locking nuts upon bolts
GB348445A (en) * 1929-07-04 1931-05-14 Ludwig Strober Improvements in nut-locks
US4983084A (en) * 1989-09-26 1991-01-08 Northrop Corporation Double locked threaded fastener

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016092572A1 (fr) * 2014-12-11 2016-06-16 Michele Eramo Systèmes anti-dévissage par friction pour des boulons
CN116292577A (zh) * 2021-12-09 2023-06-23 刘应龙 一种螺纹连接的紧固、防松方法

Also Published As

Publication number Publication date
ITAT20130001A1 (it) 2013-05-16

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