GB2477550A - Threaded insert - Google Patents

Threaded insert Download PDF

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Publication number
GB2477550A
GB2477550A GB1001963A GB201001963A GB2477550A GB 2477550 A GB2477550 A GB 2477550A GB 1001963 A GB1001963 A GB 1001963A GB 201001963 A GB201001963 A GB 201001963A GB 2477550 A GB2477550 A GB 2477550A
Authority
GB
United Kingdom
Prior art keywords
plate
threaded
insert
hole
fixing
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.)
Withdrawn
Application number
GB1001963A
Other versions
GB201001963D0 (en
Inventor
Thomas Gerard Mulcaire
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.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
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 Rolls Royce PLC filed Critical Rolls Royce PLC
Priority to GB1001963A priority Critical patent/GB2477550A/en
Publication of GB201001963D0 publication Critical patent/GB201001963D0/en
Publication of GB2477550A publication Critical patent/GB2477550A/en
Withdrawn legal-status Critical Current

Links

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
    • F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
    • F16B37/122—Threaded inserts, e.g. "rampa bolts"
    • 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
    • F16B33/00—Features common to bolt and nut
    • F16B33/002—Means for preventing rotation of screw-threaded elements
    • 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
    • F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
    • F16B37/122—Threaded inserts, e.g. "rampa bolts"
    • F16B37/125—Threaded inserts, e.g. "rampa bolts" the external surface of the insert being threaded
    • 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
    • F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
    • F16B4/004—Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment

Landscapes

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

Abstract

The present invention relates to a fixing insert (10) for providing a threaded bore (36) in an opening in a plate (1) having first and second surfaces (3, 4). The insert comprises a first part (20) having a first flange (22), a first axial portion, and a first threaded portion and a second part (30) having a second flange (32) and a second threaded portion. The first and second parts (20, 30) are arranged to be threadedly engaged, one at least partly with the other to define a threaded bore (36) for receiving a threaded fixing. in use, the axial portion of the first part is located within the opening (2) of the plate (1) and the first and second flanges (22, 32) are adjacent to the first and second surfaces (3, 4) respectively.

Description

FIXING INSERT
The present invention relates to a fixing insert, in particular, a fixing insert for an opening in a plate.
Engineering applications often require the attachment of a component to a support plate. One example is the attachment of an interfacing component to a casing soleplate in an aerospace engine. There are a number of known ways of doing this.
In a first previously considered example, a hole is drilled and then tapped in the support plate and a bolt is used to attach the component to the support plate by screwing the bolt through the component and into the threaded hole.
This is satisfactory for some applications, but the thread of the hole may become stripped or damaged by repeated installation and removal of the bolt.
It is therefore known to use a threaded insert in the hole. One such insert is known as a helical insert comprising a coil of wire. This is located within the threaded hole of the support plate and the insert itself has an internal thread for engagement with the bolt. In order to prevent the insert from winding through the threaded hole in the plate when the bolt is screwed in, the hole is only threaded over a portion of the thickness of the support plate. This requires the support plate to be locally thickened to accommodate the length of the threaded and the non-threaded length of the hole. As a result the support plate has increased weight.
When using threaded inserts it may also be necessary to provide additional material around the threaded hole in the support plate so that if the insert has to be drilled out, thus damaging the threaded hole, the support plate can still be used again by re-drilling and tapping a larger hole in the support plate. Again, this results in increased weight of the support plate.
Threaded holes may also have the effect of concentrating stress in the region of the hole, which can limit the life of the assembly.
Additionally, certain metals such as superalloys that may be used for the support plate, exhibit work-hardening during drilling of the hole prior to tapping.
This can make it more difficult to tap the hole.
In a second previously considered example, a flared hole is provided in the support plate and a swage nut is provided in the hole. The larger diameter of the flared hole means that the hole centres must be located further away from each other in the support plate, which may require a larger support plate, with increased overall weight. It is also necessary to provide an anti-rotation feature to prevent the swage nut from rotating when a bolt is screwed into it. The anti-rotation feature may be in the form of a protrusion on the underside of the support plate which abuts the swage nut to prevent the swage nut from rotating with respect to the support plate. However, this arrangement can add a considerable amount of time and cost to the production of the parts.
In a third previously considered example an insert known as a Deiron insert (RTM) is used to provide fixings to honeycomb supports. The insert comprises two parts that are located one either side of a hole in the honeycomb structure. When a bolt is screwed into the insert the two parts are drawn closer together to deform the honeycomb structure. Whilst this arrangement does not require there to be a threaded hole in the support, it is only suitable for applications with low loads where the support is compressible (such as a honeycomb structure).
Embodiments of the present invention aim to address at least some of the above problems to some extent.
The invention is described in the attached independent claim to which reference should now be made. Further, preferred features may be found in the sub-claims appended thereto.
According to a first aspect of the present invention there is provided a fixing insert for providing a threaded bore in an opening in a plate having first and second surfaces, the insert comprising: a first part having a first flange a first axial portion and a first threaded portion; and a second part having a second flange and a second threaded portion; wherein the first and second parts are arranged to be threadedly engaged, one at least partly within the other to define a threaded bore for receiving a threaded fixing; wherein in use, the axial portion of the first part is located within the opening of the plate and the first and second flanges are adjacent to the first and second surfaces respectively.
The first or second part may comprise an anti-rotation portion that in use restricts its rotation of the fixing insert. The anti-rotation portion may be arranged for interference fit with the hole or plate. The anti-rotation portion may comprise a non-circular portion.
In a preferred embodiment the threaded portion of the first part comprises a hole having an internal thread and the threaded portion of the second part comprises an axial portion having an external thread and arranged to threadedly engage the internal of the first part. The threaded bore for receiving a threaded fixing may be located in the axial portion of the second part.
In one embodiment the threaded bore is a blind hole.
The invention also relates to a plate having first and second surfaces and a hole, comprising a fixing insert according to any statement herein.
The invention further relates to a gas turbine engine comprising a fixing insert or a plate according to any statement herein.
The invention may comprise any combination of the features and/or limitations referred to herein, except combinations of such features as are mutually exclusive.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 schematically shows a fixing insert according to a first embodiment of the present invention in disassembled form; Figure 2 schematically shows the fixing insert of Figure 1 attached to a support plate; Figure 3 schematically shows a component attached to a support plate using the fixing insert of Figures 1 and 2; Figure 4 schematically shows the view A-A of Figure 2; Figure 5 schematically shows the view B-B of Figure 2; Figure 6 schematically shows the view C-C of Figure 2; Figure 7 schematically shows a fixing insert according to a second embodiment of the present invention attached to a support plate; Figure 8 schematically shows a fixing insert according to a third embodiment of the present invention attached to a support plate; Figure 9 schematically shows the view D-D of Figure 8; Figure 10 schematically shows the view E-E of Figure 9; Figures 11(a) and 11(b) schematically illustrate a method of attaching a second part of the fixing insert to a first part of the fixing insert; Figure 12 schematically illustrates a method of attaching a component to a support plate using fixing inserts according to a fourth embodiment of the present invention; and Figure 13 schematically shows the view F-F of Figure 12.
With reference to Figure 1, a fixing insert 10 according to the present invention, comprises first and second parts 20, 30 that can be attached to a hole in a plate by threading them together one within the other to provide a threaded bore for receiving a threaded member such as a bolt.
Referring to Figure la the first part 20 comprises a flange 22 and an axial portion 24. A hole 26 through the axial portion 24 carries and internal thread 28.
Referring to Figure ib, the second part 30 comprises a flange 32 and an axial portion 34 which carries an external thread 35. The external thread 35 may extend over the full length or else only part of the length of the axial portion 34.
The axial portion 34 is provided with a hole 36 that carries an internal thread 38.
The internal 38 and external 35 threads are opposite-handed.
The diameters of the axial portion 34 and the hole 26 are dimensioned so as to allow the threaded axial portion 34 of the second part 30 to be screwed into the threaded hole 26 of the first part 20.
With reference to Figure 2, the fixing insert 10 can be fitted into a non-threaded hole 2 in a support plate 1 as follows. The axial portion 24 of the first part 20 is located within the hole 2 of the support plate 1. The threaded axial portion 34 of the second part 30 then engages with the threaded hole 26 of the first part 20. The flanges 22, 32 of the first and second parts 20, 30 rest against the upper and lower surface 3, 4 of the plate respectively. The flanges 22, 32 act to securely hold the fixing insert 10 in place. They can exert a compressive force on the plate 1, the magnitude of which depends on how tightly the first and second parts 20, 30 are secured together. In this embodiment the upper surface of the plate 3 is provided with a recess 5 that has a depth approximately equal to the thickness of the flange 22 of the first part 20. When the fixing insert 10 is attached to the plate 1, the flange 22 of the first part 20 lies within the recess 5 and is flush with the upper surface 3 of the plate 1.
For ease of installation it may be desirable to provide a means of holding the first part 20 in the hole 2 in the plate 1 before attachment of the second part 30. This may be done by providing a thin-walled plastic ring on the axial portion 24 of the first part 20 in order to provide a suitable friction fit with the hole 2 in the plate 1. Alternatively, an adhesive, such as Silcoset (RTM), may be applied to the first part 20 to retain it in the hole during installation.
As shown in Figure 3, after the fixing insert 10 has been attached to a plate 1 it can be used to facilitate the attachment of a component 7 to the plate 1.
A threaded fixing member 9, such as a bolt, passes through an opening in the component 7 and engages with the threaded hole 36 of the second part 30 of the fixing insert, thereby attaching the component 7 to the plate 1. The bolt load is transferred through the internal thread 38 and through compression of the flange faces into the plate 1.
As described above, the internal thread 38 of the second part 30 is opposite to the external thread 35. This means that when a bolt 9 is screwed into the hole 36 of the second part 30, the second part 30 does not unscrew from the first part 20.
In order to facilitate ease of attachment of the fixing insert 10 to the plate 1, and of the component 7 to the fixing insert 10, it is desirable to provide the fixing insert 10 with an anti-rotation portion. This may be provided on either the first or second part 20, 30. During installation of the fixing insert 10, the anti-rotation portion prevents rotation of either the first or second part 20, 30 relative to the plate 1, and during and after attachment of the component 7 to the fixing insert 10, it prevents rotation of the fixing insert 10 relative to the plate 1.
Figure 4 shows a first embodiment of an anti-rotation portion. The flange 22 of the first part 20 is of a non-circular shape and the recess 5 within the plate 1 is of a corresponding shape. When the first part 20 is inserted into the opening 2 of the plate 1 and the flange 22 of the first part 20 is located within the recess 5, the first part 20 is unable to rotate with respect to the plate 1. When the second part 30 is screwed into the first part 20, the interference fit between the flange 22 and the plate 1 prevents the first part 20 from rotating. This makes installation easier since it is not necessary to manually hold the first part 20 in place.
As shown in Figure 5, the flange 32 of the second part 30 is of a hexagonal shape. This allows the second part 30 to be rotated with ease using a tool.
When (Figure 3) a component 7 is attached to the plate 1 via the fixing insert 10 by screwing a bolt 9 into the threaded hole 36 of the second part 30, the fixing insert 10 is prevented from rotating by the interference fit between the flange 22 and the support 1.
Figure 6 shows second embodiment of an anti-rotation portion. In this embodiment the hole 2 in the plate I is non-circular and the axial portion 24 of the first part 20 has a corresponding cross-sectional shape. Therefore, when the first part 20 is inserted into the hole 2 it cannot rotate with respect to the plate 1 due to an interference fit.
A major benefit of the fixing insert 10 is that there is no requirement for a threaded hole in the plate. This means that the plate can be manufactured more easily and cheaply. Further, the life of the plate may be increased because there are no stress concentrations as would be caused by a threaded hole. A further advantage is that the insert can be removed without damaging the plate. The first and second parts 20, 30 can be easily unscrewed. Alternatively, the insert can be drilled out without damaging the plate. A new insert can then be used if necessary. This can increase the useable life of the plate.
If an interference fit is provided between the axial portion 24 of the first part 20 and the hole 2 in the plate 1 then fluid leakage through the insert is reduced. The flanges 22,32 also act to reduce leakage by providing a seal.
Figure 7 shows a second embodiment of a fixing insert 10 according to the present invention. This embodiment is similar to the first embodiment except the threaded hole 36 in the second part 30 is a blind hole. Use of a blind hole further reduces the potential for leakage through the insert 10.
Figure 8 shows a third embodiment of fixing insert 10 according to the present invention. This embodiment is similar to the first embodiment except that the second part 30 and not the first part 20 is interference fitted to the plate 1. Referring also to Figure 9, the plate 1 is provided with a plurality of circumferentially arranged protrusions 6 and the flange 32 of the second part 30 is provided with a corresponding number of cut-outs 33. The protrusions 6 engage with the cut-outs 33 of the second part 30 and provide an interference fit which prevents the second part 30 from rotating relative to the plate 1.
Referring now to Figure 10, flange 22 of the first part 20, is provided with a plurality of circumferentially arranged blind holes 23 that allow the first part 20 to be rotated by using a tool (not shown). This is necessary because the flange 22 is located in a recess 5 and the second part 30 cannot be rotated. The tool can engage the holes 23 in the flange 22 and therefore enable the first part 20 to be rotated to threadedly engage the second part 30.
To prevent the second part 30 from unscrewing from the first part 20 when a bolt 9 is unscrewed from the threaded hole 36 of the second part 30, it may be desirable to permanently fix the second part 30 to the first part 20, as will be described below.
Figure 11 illustrates one method of permanently attaching the second part 30 to the first part 20. After the first part 20 has been located within the hole 2 and the second part 30 has been screwed into the first part 20, a tool 100 having a threaded portion 102 and a shoulder 104 is screwed into the threaded hole 36 of the second part 30. As the shoulder 104 of the tool 100 meets the axial portion 34 of the second part 30, further rotation of the tool 100 causes the shoulder 104 to deform an upper part of the axial portion 34, causing the axial portion 34 of the second part 30 to become permanently attached to the axial portion 24 of the first part 20.
Figures 12 and 13 show a fourth embodiment of the invention in which the fixing insert 10 is not provided with an anti-rotation portion. In this embodiment a plurality of fixing inserts 10 are located within a respective plurality of holes in a plate 1. The support 1 is not provided with recesses for the flanges 22 of the first parts 20 of the fixing inserts 10. Instead, the flanges 22 sit proud of the surface 3 of the plate 1. As shown in Figure 13, the flanges 22 of the first parts 20 are non-circular. After the first parts 20 of the fixing inserts 10 have been inserted into the holes 2, a jig 200 is placed over the flanges 22 of the first parts 20. The jig 200 has a plurality of non-circular recesses 202 that correspond to the shape of the non-circular flanges 22. This prevents the first parts 20 from rotating with respect to the plate 1 due to the interference fit between a plurality of flanges 22 and the jig 200. The second parts 30 are then screwed into the first parts 20 and the jig 200 is removed. The component 7 to be attached to the plate 1 is then placed over the flanges 22 of the first parts 20. The component 7 is provided with non-circular recesses that correspond to the shape of the non-circular flanges 22. This prevents the fixing inserts 10 from rotating with respect to the plate 1 due to the interference fit between the plurality of flanges 22 and the jig 200. Bolts 9 are then passed through holes in the component and threadedly engaged with the threaded holes 36 of the second parts 30, thereby attaching the component 7 to the plate 1.

Claims (10)

  1. CLAIMS: 1. A fixing insert (10) for providing a threaded bore (36) in an opening (2) in a plate (1) having first and second surfaces (3, 4), the insert comprising: a first part (20) having a first flange (22) a first axial portion (24) and a first threaded portion (28); and a second part (30) having a second flange (32) and a second threaded portion (35); wherein the first and second parts (20, 30) are arranged to be threadedly engaged, one at least partly within the other to define a threaded bore (36) for receiving a threaded fixing; wherein in use, the axial portion (24) of the first part is located within the opening (2) of the plate (1) and the first and second flanges (22, 32) are adjacent to the first and second surfaces (3, 4) respectively.
  2. 2. A fixing insert (10) according to claim 1, wherein the first or second part (30, 30) comprises an anti-rotation portion (24, 22, 32) that in use restricts its rotation with respect to the plate.
  3. 3. A fixing insert (10) according to claim 2, wherein the anti-rotation portion (24, 22, 32) is arranged for interference fit with the hole or plate.
  4. 4. A fixing insert (10) according to claim 3, wherein the anti-rotation portion (24, 22, 32) comprises a non-circular portion.
  5. 5. A fixing insert (10) according to any preceding claim, wherein the threaded portion (28) of the first part (20) comprises a hole (26) having an internal thread (28) and the threaded portion (35) of the second part (30) comprises an axial portion (34) having an external thread (35) and arranged to threadedly engage the internal thread (28) of the first part (20).
  6. 6. A fixing insert (10) according to claim 5, wherein the threaded bore (36) for receiving a threaded fixing is located in the axial portion (34) of the second part (30).
  7. 7. A fixing insert (10) according to any preceding claim, wherein the threaded bore (36) is a blind hole.
  8. 8. A plate (1) having first and second surfaces (3, 5) and a hole therethrough, comprising a fixing insert (10) according to any of claims 1-7.
  9. 9. A gas turbine engine comprising a fixing insert (10) according to any of claims 1-7 or a plate according to claim 8.
  10. 10. A fixing insert, substantially as described herein with reference to the attached drawings.
GB1001963A 2010-02-08 2010-02-08 Threaded insert Withdrawn GB2477550A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1001963A GB2477550A (en) 2010-02-08 2010-02-08 Threaded insert

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1001963A GB2477550A (en) 2010-02-08 2010-02-08 Threaded insert

Publications (2)

Publication Number Publication Date
GB201001963D0 GB201001963D0 (en) 2010-03-24
GB2477550A true GB2477550A (en) 2011-08-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB1001963A Withdrawn GB2477550A (en) 2010-02-08 2010-02-08 Threaded insert

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2706275A3 (en) * 2012-09-07 2014-08-06 Herborner Pumpenfabrik J.H. Hoffmann GmbH & Co. KG Connection system
CN105156446A (en) * 2014-05-09 2015-12-16 爱威德尔英国有限公司 Apparatus and methods for providing a threaded fixing in a crushable or brittle material
US20170067513A1 (en) * 2015-09-04 2017-03-09 Phoenix Sokoh Couplings, LLC Coupling assembly
WO2022144054A1 (en) * 2020-12-31 2022-07-07 Gentherm Gmbh Electrical connecting element and method for the production thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169372A (en) * 1985-01-07 1986-07-09 Rexnord Inc Securing fasteners in fibrous material
US4981735A (en) * 1989-09-05 1991-01-01 The United States Of America As Represented By The Secretary Of The Army Two piece threaded mounting insert with adhesive for use with honeycomb composite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169372A (en) * 1985-01-07 1986-07-09 Rexnord Inc Securing fasteners in fibrous material
US4981735A (en) * 1989-09-05 1991-01-01 The United States Of America As Represented By The Secretary Of The Army Two piece threaded mounting insert with adhesive for use with honeycomb composite

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2706275A3 (en) * 2012-09-07 2014-08-06 Herborner Pumpenfabrik J.H. Hoffmann GmbH & Co. KG Connection system
US9651074B2 (en) 2012-09-07 2017-05-16 Herborner Pumpenfabrik Connection system
CN105156446A (en) * 2014-05-09 2015-12-16 爱威德尔英国有限公司 Apparatus and methods for providing a threaded fixing in a crushable or brittle material
US10060464B2 (en) 2014-05-09 2018-08-28 Avdel Uk Limited Apparatus and methods for providing a threaded fixing in a crushable or brittle material
US20170067513A1 (en) * 2015-09-04 2017-03-09 Phoenix Sokoh Couplings, LLC Coupling assembly
US9771983B2 (en) * 2015-09-04 2017-09-26 Phoenix Sokoh Couplings, LLC Coupling assembly
WO2022144054A1 (en) * 2020-12-31 2022-07-07 Gentherm Gmbh Electrical connecting element and method for the production thereof

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