GB2358217A - Threaded fastener - Google Patents
Threaded fastener Download PDFInfo
- Publication number
- GB2358217A GB2358217A GB0000628A GB0000628A GB2358217A GB 2358217 A GB2358217 A GB 2358217A GB 0000628 A GB0000628 A GB 0000628A GB 0000628 A GB0000628 A GB 0000628A GB 2358217 A GB2358217 A GB 2358217A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fastener
- adhesive
- sheath
- head
- threaded
- 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- Withdrawn
Links
- 239000000853 adhesive Substances 0.000 claims abstract description 28
- 230000001070 adhesive effect Effects 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 241000937413 Axia Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229940072293 axid Drugs 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- SGXXNSQHWDMGGP-IZZDOVSWSA-N nizatidine Chemical compound [O-][N+](=O)\C=C(/NC)NCCSCC1=CSC(CN(C)C)=N1 SGXXNSQHWDMGGP-IZZDOVSWSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
-
- 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
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/14—Non-metallic plugs or sleeves; Use of liquid, loose solid or kneadable material therefor
- F16B13/141—Fixing plugs in holes by the use of settable material
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- 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
- F16B39/225—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of a settable material
Abstract
A set bolt 11 has a head 12 and a shank 14 including a dowel portion 19 and a screw-threaded portion 15. The end remote from the head 12 has a spigot 16 onto which is fitted a collapsible end cap 17. A sheath 18 of a high viscosity anaerobic adhesive extends over the cap 17 and the screw-threaded shank portion 15, being preformed, e.g. by moulding or by extrusion, or being moulded directly onto the bolt 11. When the fastener 11 is inserted into the hole 21 the adhesive sheath 18 engages the bottom of the hole and an axial force on the head 12 displaces the adhesive into contact with the surface of the hole 21. When the adhesive sheath has set, the bolt 11 can be turned in the normal tightening direction to retain a sheet metal component 24. During this tightening the end cap 17 can buckle and the air inside the cap compresses to allow the linear displacement of the bolt 11.
Description
2358217 Threaded Fastener The invention relates to threaded fasteners
particularly those for insertion in a blind hole in a casting or a similar component. Such holes are normally drilled and tapped to form a screw thread for engagement with the threaded fastener. However, this is a time consuming operation requiring care to remove swarf and 5 avoid tap breakage.
It is an object of the present invention to provide an improved fastener for use in a blind hole and an improved method of assembling such a fastener into a blind hole.
According to one aspect of the invention there is provided a threaded fastener for use in a blind hole, the fastener comprising a head and a shank extending from the head, the shank including a screw-threaded portion adjacent an end remote from the head, wherein the screw-threaded shank portion carries a sheath of highviscosity adhesive.
Preferably, the sheath of adhesive extends over said end of the fastener.
In a preferred arrangement, said end of the fastener carries a collapsible end cap which may conveniently be fitted onto a spigot formed on said end of the fastener. The end cap may have an outer diameter substantially the same as or slightly larger than the minor diameter of the threaded portion. This creates a hole in the adhesive sheath which the threaded portion of the fastener can bite into after the adhesive has set. Alternatively, the end cap may have an outer diameter substantially the same as or slightly larger than the major diameter of the threaded portion. This creates a hole in the adhesive sheath which the threaded portion of the fastener can enter without biting into the sheath.
The sheath may extend over the end cap. In use the end cap collapses When the fastener is tightened following setting of the adhesive.
The shank may have a dowel portion immediately adjacent the e ad, preferably with a diameter slightly greater than the outer diameter of the shol a th. 5 In use the dowel portion is a close fit in the hole A vent passage may be provided between said end and the head. This aoc.ws for the escape of air when the fastener is tightened after the adhesive sets.
The threaded portion immediately adjacent said end may be provided vi,th thread-forming means, e.g. an axia.Uy-extending groove. This help to allows threads to be formed in the sheath during the tightening.
The invention also provides, according to another aspect, a metho4. of assembling a fastener according to said one aspect into a blind hole axid comprising the steps of pushing the fastener into the hole with sufficient for4e to compress the adhesive against the hole, and causing the adhesive to set. 'I he method may include the further step of turning the fastener after the adhesil is set so as to tighten the fastener in the hole.
The invention will now be described by way of example and with refereri(tie:: to the accompanying drawings, of which:
Fig. 1 is a part-sectional view of a threaded fastener according to the invention; and Fig.2 is a part-sectional view showing the fastener of Fig.1 assembled il't, a blind hole.
Fig.1 shows a threaded fastener in the form of a set bolt 11 having a hea; :12 with a hexagon recess 13 at one end of a shank 14 and a screwthreaded stia,k portion 15 adjacent the other end, i.e. remote from the head 12. The end remote from the head 12 has a spigot 16 onto which is fitted a hollow end cap 17 of plastics material or a soft metal such as aluminium. A sheath 18 of a high viscosity adhesive extends over the cap 17 and the screw- threaded shank portion 15. The sheath 18 may be preformed, e.g. by moulding or by extrusion, or may be moulded directly onto the bolt 11.
Immediately adjacent the head 12 the shank 14 has a dowel portion 19 which is of a diameter D1 which is substantially the same as a hole 21 formed in a cast component 22 (Fig.2). The outer diameter D2 of the sheath 18 is slightly smaller than the diameter D1, e.g., by approximately O.1mm. An axial groove 23 is provided in the threaded portion 15 immediately adjacent the spigot 16.
When the bolt 11 is inserted into the hole 21 the adhesive sheath 18 engages the bottom of the hole and an axial force on the head 12 displaces the adhesive into contact with the surface of the hole 21. In the particular example shown, the adhesive material of the sheath 18 is anaerobic, e.g., an anaerobic epoxy, and is therefore self-setting in the absence of oxygen from the atmosphere. When setting has been achieved the bolt 11 can be turned in the normal tightening direction to retain a sheet metal component 24. During this tightening the end cap 17 can buckle and the air inside the cap compresses to allow the linear displacement of the bolt 11. The end cap 17 has an outer diameter which is the same as or slightly greater than the minor diameter of the threaded shank portion 15. This creates a blind hole in the adhesive sheath so that the threads of the bolt can bite into the sheath during this tightening stage. Alternatively, the end cap 17 may have an outer diameter which is the same as or slightly greater than the major diameter of the threaded shank portion 15 so that the threads of the bolt can simply enter the blind hole without interference as the end cap 17 collapses during this tightening stage.
If required, setting may be promoted by a catalyst or a reactant injecteq o,r sprayed into the hole 21 before insertion of the bolt 11. Before the sheath 18 is fitted or moulded, the bolt may be coated with a release agent to allow ithe tightening process and to allow for unfastening at a later stage. the hollow cap, [7 may be corrugated or have a stepped diameter to promote collapse during 'the tightening stage.
During insertion of the bolt 11 into the hole 21, the dowel portion 19 helps align the bolt and avoid unwanted distortion of the adhesive sheath 18, in additiOn to providing location for the sheet metal component 24 and providing dilieOt support against lateral loads on the bolt head 12. The groove 23 allows he threaded portion 15 to create its own thread form in the hardened sheath IS during the tightening process. For this purpose, other thread forming formatiolts may be used e.g., the first few thread turns adjacent the leading end of the shank may be on a trilobular section instead of the usual circular section to the threa4 in the sheath 18 to be formed by plastic deformation.
For large bolt sizes or if the linear displacement of the bolt during tighternri'g is large, an axial vent passage 25 may be provided between the end face of thp spigot 16 and the hexagon recess 13. This axial vent passage 25 may,,be intersected by a radial vent passage 26 which allows air to escape from 'e annular space between the adhesive sheath 18 and the dowel portion 19. To hA exclusion of air (to promote setting of the anaerobic adhesive, the sheath 18 may extend up to the dowel portion 19 to reduce or eliminate trapped air. Instead of 'I E n anaerobic adhesive, other high-viscosity adhesives may be used.
In place of the sheet metal component 24, the bolt 11may be used to sec lie any relatively thin component, e.g. a plastics component such as a printed circ't board.
Claims (16)
1. A threaded fastener comprising a head and a shank extending from the head, the shank including a screw-threaded portion adjacent an end remote from the head, wherein the screw-threaded shank portion carries a sheath of highviscosity adhesive.
2. A fastener as claimed in claim 1 wherein the sheath of adhesive extends over said end of the fastener.
3. A fastener as claimed in claim 1 or claim 2 wherein said end of the fastener carries a collapsible end cap.
4. A fastener as claimed in claim 3 wherein the end cap is fitted onto a spigot formed on said end of the fastener.
5. A fastener as claimed in claim 4 wherein the end cap has an outer diameter substantially the same as or slightly larger than the minor diameter of the threaded portion.
6. A fastener as claimed in claim 4 wherein the end cap has an outer diameter substantially the same as or slightly larger than the major diameter of the threaded portion.
7. A fastener as claimed in any of claims 3 to 6 wherein the sheath extends over the end cap.
8. A fastener as claimed in any preceding claim wherein the shank has a dowel portion immediately adjacent the head.
9. A fastener as claimed in claim 8 wherein in the dowel portion has a diai-deer slightly greater than the outer diameter of the sheath.
10. A fastener as claimed in any preceding claim wherein a vent passag e is provided between said end and the head.
11. A fastener as claimed in any preceding claim wherein the threaded por 1 U on immediately adjacent said end is provided with thread-forming means.
12. A fastener as claimed in claim 11 wherein the thread-forming means comp. pr, se an axially-extending groove.
13. A threaded fastener substantially as described herein with reference to the accompanying drawings.
14. A method of assembling a fastener as claimed in any preceding claim int: a blind hole and comprising the steps of pushing the fastener into the hole ith sufficient force to compress the adhesive against the hole, and causing the adhesive to set.
15. A method as claimed in claim 14 and including the further step of turning Ithie fastener after the adhesive is set so as to tighten the fastener in the hole.
16. A method of assembling a fastener into a blind hole substantially as described herein with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0000628A GB2358217A (en) | 2000-01-13 | 2000-01-13 | Threaded fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0000628A GB2358217A (en) | 2000-01-13 | 2000-01-13 | Threaded fastener |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0000628D0 GB0000628D0 (en) | 2000-03-01 |
| GB2358217A true GB2358217A (en) | 2001-07-18 |
Family
ID=9883553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0000628A Withdrawn GB2358217A (en) | 2000-01-13 | 2000-01-13 | Threaded fastener |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2358217A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD741159S1 (en) * | 2014-05-22 | 2015-10-20 | Karmax Holding Gmbh & Co. Kg | Screw |
| DE102017106660A1 (en) * | 2017-03-28 | 2018-10-04 | Ejot Baubefestigungen Gmbh | Screw and method for producing a screw connection |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110094405B (en) * | 2019-03-22 | 2024-03-12 | 东风商用车有限公司 | Buckle type bolt and using method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3783921A (en) * | 1971-04-01 | 1974-01-08 | Illinois Tool Works | Screw fastener and method of applying same |
| US4051681A (en) * | 1975-10-06 | 1977-10-04 | Lee William Yaros | Unitary roof bolt assembly |
| GB1494364A (en) * | 1974-03-06 | 1977-12-07 | Illinois Tool Works | Stud members |
| US5490365A (en) * | 1994-05-11 | 1996-02-13 | Roth; Steven A. | Anchor bolt assembly |
-
2000
- 2000-01-13 GB GB0000628A patent/GB2358217A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3783921A (en) * | 1971-04-01 | 1974-01-08 | Illinois Tool Works | Screw fastener and method of applying same |
| GB1494364A (en) * | 1974-03-06 | 1977-12-07 | Illinois Tool Works | Stud members |
| US4051681A (en) * | 1975-10-06 | 1977-10-04 | Lee William Yaros | Unitary roof bolt assembly |
| US5490365A (en) * | 1994-05-11 | 1996-02-13 | Roth; Steven A. | Anchor bolt assembly |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD741159S1 (en) * | 2014-05-22 | 2015-10-20 | Karmax Holding Gmbh & Co. Kg | Screw |
| DE102017106660A1 (en) * | 2017-03-28 | 2018-10-04 | Ejot Baubefestigungen Gmbh | Screw and method for producing a screw connection |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0000628D0 (en) | 2000-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| COOA | Change in applicant's name or ownership of the application | ||
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |