GB1579730A - Self-locking fasteners - Google Patents

Self-locking fasteners Download PDF

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Publication number
GB1579730A
GB1579730A GB4526476A GB4526476A GB1579730A GB 1579730 A GB1579730 A GB 1579730A GB 4526476 A GB4526476 A GB 4526476A GB 4526476 A GB4526476 A GB 4526476A GB 1579730 A GB1579730 A GB 1579730A
Authority
GB
United Kingdom
Prior art keywords
nut
actuator body
screw
rib
collar
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.)
Expired
Application number
GB4526476A
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.)
DELANEY GALLAY DYNAMICS Ltd
Original Assignee
DELANEY GALLAY DYNAMICS Ltd
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 DELANEY GALLAY DYNAMICS Ltd filed Critical DELANEY GALLAY DYNAMICS Ltd
Priority to GB4526476A priority Critical patent/GB1579730A/en
Publication of GB1579730A publication Critical patent/GB1579730A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F16B39/22Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28Locking 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
    • F16B39/282Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)
  • Clamps And Clips (AREA)
  • Bolts, Nuts, And Washers (AREA)

Description

(54) IMPROVEMENTS IN OR RELATING TO SELF-LOCKING FASTENERS (71) We, DELANEY GALLAY DYNAMICS LIMITED, a British Company of Edgware Road, Cricklewood, London NW2 6LD, England, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed to be particularly described in and by the following statement-: This invention relates to self-locking fasteners, especially such as are used for securing electronic equipment in aircraft.
According to the present invention, in a self-locking fastener comprising a screw, a ratchet-toothed collar to slide along the screw without relative rotation, a nut threaded on the screw, and an actuator body around the nut having ratchet teeth to cooperate with those on the collar and spring-urged axially relatively to the nut in the direction of the collar, at least the screw and the nut are of stainless steel which is electroless nickel plated.
Although high tensile martensitic noncorrodible steel has been specified for these components, we have discovered that the corrosion resistance of this material is too limited under severe conditions, whereas electroless nickel plating solves the problem, whilst providing hard-wearing properties.
In the preferred construction, the nut has a flange on its end remote from the collar, and a circlip groove around its opposite end, the actuator body surrounding the nut has an internal circumferential rib at a position intermediate its ends, a compression spring is provided between this rib and the nut flange, and the nut is retained captive in the actuator body by the circlip which lies within the actuator body on the opposite side of the rib to the spring.
The circlip has no function in the operation of the fastener except to prevent the parts from becoming inconveniently disassembled when the fastener is unscrewed. Its position within the actuator body contributes to a clean exterior of the fastener. The assembly of nut, actuator body and ratchet spring gives a simple and robust means of driving the fastener into the locked condition.
One arrangement in accordance with the invention will now be described by way of example and with reference to the accompanying drawings, in which: Figure 1 is a side elevation of the device to be described, Figure 2 is a view on the line 2-2 of Figure 1, and Figure 3 is an exploded view.
A screw 11, threaded for most of its length, has a comparatively short unthreaded portion 12 at one end with a transverse hole 13 through which a hinge pin 18 can be passed. The screw has longitudinal flats 14 on opposite sides.
Both the screw and the pin are of electroless nickel plated stainless steel. A stainless steel collar 15 on the screw is able to slide loosely along it but cannot rotate relatively to the screw since it has a bore with flats that match the flats on the screw. This collar is formed, at its face directed away from the unthreaded end of the screw, with a ring of twelve ratchet teeth 16. The collar is designed to prevent jamming of the screw when subjected to eccentric loading.
A round nut 17 is threaded onto the screw to lie on the side of the collar 15 that presents the ratchet teeth. The end of the nut nearer the collar is smaller in diameter than the internal diameter of the ring of ratchet teeth and has a circumferential groove 19 in it to receive a cadmium-plated spring steel circlip 20. At its opposite end the nut has a circumferential flange 21 and intermediate its ends there is a step 22 in its external diameter. The nut is of electroless nickel plated stainless steel.
Around the nut 17 there is assembled a stainless steel actuator body 23 which has at one end a ring of twelve ratchet teeth 24 to cooperate with the teeth 16 on the collar 15. At its other end the actuator body has a circumferential enlargement that is knurled as at 25 to enable the actuator body to be easily turned with the fingers.
Internally, the actuator body has a rib 26 extending circumferentially of its bore, and with nut engaging flats on the rib. A stainless steel coil compression spring 27 within the actuator body bears at one end on this rib and at its other end on the end flange 21 of the nut 17, thereby tending to urge the actuator body axially in relation to the nut in the direction away from the nut flange. The nut is nevertheless held captive within the actuator body by the circlip 20 engaging the side of the rib 26 opposite to the spring 27.
When the nut and actuator body assembly has been threaded on to the screw, a retaining end stop is secured on the end of the screw 11, or can be formed by upsetting the end of the screw.
In operation, the plain (or unthreaded) end of the screw is positioned within the fastener bracket fixed to the base, and the hinge pin inserted. The fastener assembly can then be swung to a position whereby the collar locates on the equipment fitting.
Fastening is then accomplished merely by turning the actuator body until the fastener is tight. As the actuator body is turned clockwise thereby turning the nut and the fastener tightens, the ratchet teeth of the collar and actuator body click over one another and prevent reverse rotation, the ratchet action being accompanied by small axial movements to and fro of the actuator body relatively to the nut. The two sets of twelve ratchet teeth are fully-formed to provide positive locking under all conditions. The driving connection between the actuator body 23 and the nut 17 is by means of a flat on each of opposed inwardly extending portions of the rib 26 which mate with corresponding flats (one of which can be seen in Figure 3) on the inner end of the nut 17.
WHAT WE CLAIM IS:- 1. A self-locking fastener comprising a screw, a ratchet-toothed collar to slide along the screw without relative rotation, a nut threaded on the screw, and an actuator body around the nut having ratchet teeth to cooperate with those on the collar and spring-urged axially relatively to the nut in the direction of the collar, and wherein at least the screw and the nut are of stainless steel which is electroless nickel plates.
2. A fastener according to claim 1, wherein the nut has a flange on its end remote from the collar, and a circlip groove around its opposite end, the actuator body surrounding the nut has an internal circumferential rib at a position intermediate its ends, a compression spring is provided between this rib and the nut flange, and the nut is retained captive in the actuator body by the circlip which lies within the actuator body on the opposite side of the rib to the spring.
3. A self-locking fastener substantially as described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. Internally, the actuator body has a rib 26 extending circumferentially of its bore, and with nut engaging flats on the rib. A stainless steel coil compression spring 27 within the actuator body bears at one end on this rib and at its other end on the end flange 21 of the nut 17, thereby tending to urge the actuator body axially in relation to the nut in the direction away from the nut flange. The nut is nevertheless held captive within the actuator body by the circlip 20 engaging the side of the rib 26 opposite to the spring 27. When the nut and actuator body assembly has been threaded on to the screw, a retaining end stop is secured on the end of the screw 11, or can be formed by upsetting the end of the screw. In operation, the plain (or unthreaded) end of the screw is positioned within the fastener bracket fixed to the base, and the hinge pin inserted. The fastener assembly can then be swung to a position whereby the collar locates on the equipment fitting. Fastening is then accomplished merely by turning the actuator body until the fastener is tight. As the actuator body is turned clockwise thereby turning the nut and the fastener tightens, the ratchet teeth of the collar and actuator body click over one another and prevent reverse rotation, the ratchet action being accompanied by small axial movements to and fro of the actuator body relatively to the nut. The two sets of twelve ratchet teeth are fully-formed to provide positive locking under all conditions. The driving connection between the actuator body 23 and the nut 17 is by means of a flat on each of opposed inwardly extending portions of the rib 26 which mate with corresponding flats (one of which can be seen in Figure 3) on the inner end of the nut 17. WHAT WE CLAIM IS:-
1. A self-locking fastener comprising a screw, a ratchet-toothed collar to slide along the screw without relative rotation, a nut threaded on the screw, and an actuator body around the nut having ratchet teeth to cooperate with those on the collar and spring-urged axially relatively to the nut in the direction of the collar, and wherein at least the screw and the nut are of stainless steel which is electroless nickel plates.
2. A fastener according to claim 1, wherein the nut has a flange on its end remote from the collar, and a circlip groove around its opposite end, the actuator body surrounding the nut has an internal circumferential rib at a position intermediate its ends, a compression spring is provided between this rib and the nut flange, and the nut is retained captive in the actuator body by the circlip which lies within the actuator body on the opposite side of the rib to the spring.
3. A self-locking fastener substantially as described with reference to the accompanying drawings.
GB4526476A 1976-11-01 1976-11-01 Self-locking fasteners Expired GB1579730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4526476A GB1579730A (en) 1976-11-01 1976-11-01 Self-locking fasteners

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4526476A GB1579730A (en) 1976-11-01 1976-11-01 Self-locking fasteners

Publications (1)

Publication Number Publication Date
GB1579730A true GB1579730A (en) 1980-11-26

Family

ID=10436537

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4526476A Expired GB1579730A (en) 1976-11-01 1976-11-01 Self-locking fasteners

Country Status (1)

Country Link
GB (1) GB1579730A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563870A2 (en) * 1992-04-01 1993-10-06 SCHWAB SANITäR-PLASTIC GmbH Quick acting fixing device
FR2726536A1 (en) * 1994-11-08 1996-05-10 Barre Bernard SELF-ACTIVATING LOCKING DEVICE
US5611654A (en) * 1995-08-02 1997-03-18 Southco, Inc. Captive nut
EP0824635A1 (en) * 1994-07-15 1998-02-25 Hi-Shear Corporation Self-locking bearing nut
US5851095A (en) * 1998-04-14 1998-12-22 Southco, Inc. Captive screw
US5910052A (en) * 1998-04-14 1999-06-08 Southco, Inc. Process for manufacturing a captive screw
US6238155B1 (en) 1995-11-06 2001-05-29 Southco, Inc. Torque screw fastener
US6468012B2 (en) 1998-04-14 2002-10-22 Southco, Inc. Captive screw
US6761521B2 (en) 2000-12-16 2004-07-13 Southco, Inc. Captive screw
EP2407643A1 (en) 2010-07-15 2012-01-18 Siemens Aktiengesellschaft Bore-scope sealing apparatus
CN102705343A (en) * 2010-08-02 2012-10-03 泷源制造株式会社 Bolt having a rotation preventing mechanism
CN103104585A (en) * 2012-12-08 2013-05-15 宁波市鄞州云帆工程咨询有限公司 Ring-shaped array locking-type bi-directional anti-loosing fastener
CN106949364A (en) * 2017-05-25 2017-07-14 歌尔科技有限公司 A kind of variable-diameter Quick Release fastener
CN113124038A (en) * 2021-04-25 2021-07-16 重庆建设工业(集团)有限责任公司 Self-adaptation check screw connection structure
CN113931917A (en) * 2021-08-30 2022-01-14 航天特种材料及工艺技术研究所 Gear type locking and anti-loosening mechanism

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0563870A3 (en) * 1992-04-01 1994-09-28 Schwab Sanitaer Plastic Gmbh Quick acting fixing device
EP0563870A2 (en) * 1992-04-01 1993-10-06 SCHWAB SANITäR-PLASTIC GmbH Quick acting fixing device
EP0824635A1 (en) * 1994-07-15 1998-02-25 Hi-Shear Corporation Self-locking bearing nut
EP0824635A4 (en) * 1994-07-15 1998-02-25
FR2726536A1 (en) * 1994-11-08 1996-05-10 Barre Bernard SELF-ACTIVATING LOCKING DEVICE
WO1996014516A1 (en) * 1994-11-08 1996-05-17 Jpb Systeme Self-locking sealing device
US5897277A (en) * 1994-11-08 1999-04-27 Jpb Systeme Self-locking obturating device
US5611654A (en) * 1995-08-02 1997-03-18 Southco, Inc. Captive nut
US6238155B1 (en) 1995-11-06 2001-05-29 Southco, Inc. Torque screw fastener
US6280131B1 (en) 1998-04-14 2001-08-28 Southco, Inc. Captive screw
US6086480A (en) * 1998-04-14 2000-07-11 Southco, Inc. Process for manufacturing a captive screw
US5910052A (en) * 1998-04-14 1999-06-08 Southco, Inc. Process for manufacturing a captive screw
US5851095A (en) * 1998-04-14 1998-12-22 Southco, Inc. Captive screw
US6468012B2 (en) 1998-04-14 2002-10-22 Southco, Inc. Captive screw
US6761521B2 (en) 2000-12-16 2004-07-13 Southco, Inc. Captive screw
WO2012007248A2 (en) 2010-07-15 2012-01-19 Siemens Aktiengesellschaft Bore-scope sealing apparatus and plug therefor
EP2407643A1 (en) 2010-07-15 2012-01-18 Siemens Aktiengesellschaft Bore-scope sealing apparatus
US9046003B2 (en) 2010-07-15 2015-06-02 Siemens Aktiengesellschaft Bore-scope sealing apparatus and plug therefor
CN102705343A (en) * 2010-08-02 2012-10-03 泷源制造株式会社 Bolt having a rotation preventing mechanism
CN102705343B (en) * 2010-08-02 2015-11-25 泷源制造株式会社 With the bolt of rotation preventing mechanism
CN103104585A (en) * 2012-12-08 2013-05-15 宁波市鄞州云帆工程咨询有限公司 Ring-shaped array locking-type bi-directional anti-loosing fastener
CN106949364A (en) * 2017-05-25 2017-07-14 歌尔科技有限公司 A kind of variable-diameter Quick Release fastener
CN113124038A (en) * 2021-04-25 2021-07-16 重庆建设工业(集团)有限责任公司 Self-adaptation check screw connection structure
CN113124038B (en) * 2021-04-25 2021-11-23 重庆建设工业(集团)有限责任公司 Self-adaptation check screw connection structure
CN113931917A (en) * 2021-08-30 2022-01-14 航天特种材料及工艺技术研究所 Gear type locking and anti-loosening mechanism

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee