US20020119024A1 - Blind rivet - Google Patents

Blind rivet Download PDF

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Publication number
US20020119024A1
US20020119024A1 US10/004,552 US455201A US2002119024A1 US 20020119024 A1 US20020119024 A1 US 20020119024A1 US 455201 A US455201 A US 455201A US 2002119024 A1 US2002119024 A1 US 2002119024A1
Authority
US
United States
Prior art keywords
shell
rivet
indentations
mandrel
head
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.)
Abandoned
Application number
US10/004,552
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English (en)
Inventor
Gary Jennings
Peter Probert
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.)
Newfrey LLC
Original Assignee
Emhart LLC
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 Emhart LLC filed Critical Emhart LLC
Assigned to EMHART LLC reassignment EMHART LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JENNINGS, GARY, PROBERT, PETER CHRISTOPHER
Publication of US20020119024A1 publication Critical patent/US20020119024A1/en
Assigned to NEWFREY LLC reassignment NEWFREY LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: EMHART LLC
Priority to US11/541,943 priority Critical patent/US7396287B2/en
Abandoned 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
    • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
    • F16B19/04—Rivets; Spigots or the like fastened by riveting
    • F16B19/08—Hollow rivets; Multi-part rivets
    • F16B19/10—Hollow rivets; Multi-part rivets fastened by expanding mechanically
    • F16B19/1027—Multi-part rivets
    • F16B19/1036—Blind rivets
    • F16B19/1045—Blind rivets fastened by a pull - mandrel or the like
    • F16B19/1054—Blind rivets fastened by a pull - mandrel or the like the pull-mandrel or the like being frangible

Definitions

  • This invention relates to a blind rivet, and more especially to a blind rivet comprising a tubular shell and a mandrel extending through the shell.
  • a typical rivet of this type comprises an outer tubular shell having circumferential grooves spaced at intervals along its length, and a mandrel, having a radially enlarged head at one end, extending through the shell.
  • the shell also usually has a radially extending head, which acts against one face of a workpiece.
  • the mandrel is pulled axially relative to the shell, while supporting the shell head, causing the enlarged head of the mandrel to urge against the opposed end face of the tubular shell.
  • the circumferential grooves in the tubular shell are thereby caused to collapse in an axial direction, securing the workpiece components together, and finally the portions of the shell between the grooves are caused to expand radially to form a characteristic “cottage loaf” shape, or “cottage loaf set”.
  • the rivet thereby holds the workpiece components together and fills the hole in the workpiece through which it passes.
  • one type of multigrip rivet has a tubular shell with a profiled exterior shape in which there are two axially spaced regions of reduced diameter.
  • the reduced diameter regions are produced by deforming the shell inwardly, after the mandrel has been inserted into the shell, by means of a crimping operation (i.e. using radially inwardly moving dies) or a rolling operation.
  • U.S. Pat. No. 5,496,140 describes another known blind rivet. It comprises an outer tubular shell, and a mandrel extending therethrough.
  • the outer shell is provided with one or two sets of recesses, the recesses of each set being arranged in a circumferential direction, spaced apart from each other, and essentially in the same axial position.
  • the bottoms of the recesses form a secant with respect to the cylindrical circumference of the rivet shell.
  • blind rivets are often required to operate in oversized holes, and in a variety of grip thicknesses.
  • Some of the known blind rivets can perform well in such conditions, the multigrip nature of the “cottage-loaf” shape deformation also being capable of adjusting to oversize holes, and the variety of grip thicknesses; this being achieved by appropriate positioning of the circumferential grooves or recesses in the shell.
  • groove or recess depth is critical; if the grooves are too deep they will cause cracking or even fracture of the rivet body; but if the grooves are too shallow they will not provide sufficient resistance to prevent the mandrel head from pulling into or even through the mandrel body.
  • a blind rivet comprising a tubular shell, and a mandrel extending through the shell, wherein:
  • the shell has an outwardly extending flange at one end forming a rivet head, and comprises a first set of radial indentations arranged around the periphery of the shell at a first distance from the rivet head, and a second set of radial indentations arranged around the periphery of the shell at a second distance from the rivet head, the radial indentations having been formed by crimping into the rivet shell after it is positioned on the mandrel;
  • the end of the shell that is remote from the rivet head being the blind end of the rivet shell
  • the mandrel having a head at one end which abuts against the blind end of the shell, and a stem extending from the head, the stem having a point of weakness part way along its length.
  • Another aspect of the invention provides a method of securing two or more workpiece components together using a blind rivet according to the invention, the method comprising (a) positioning the blind rivet such that the mandrel of the blind rivet extends through substantially aligned apertures in the workpiece components, and (b) moving the mandrel axially relative to the shell such that the head of the mandrel abuts against the blind end of the shell, thereby causing the portions of the shell between the indentations to expand radially, and the radial indentations in the shell to collapse, whereby the workpiece components are held together and the apertures in the workpiece components are substantially filled.
  • the invention also provides a blind rivet positioned, and preferably set, within substantially aligned apertures of two or more workpiece components.
  • the blind rivet comprises a third set of indentations arranged around the periphery of the stem at a third distance from the rivet head.
  • the spacing between adjacent sets of indentations may be the same or different.
  • each set of indentations is at least 2 mm, more preferably at least 3 mm from its adjacent set(s) of indentations.
  • the first set of indentations are positioned 3 to 5 mm from the shell flange
  • the second set of indentations are arranged at 6.5 to 8.5 mm from the shell flange
  • the third set of indentations, if present, are positioned 12.5 to 14.5 mm from the shell flange.
  • the formation of the radial indentations by crimping introduces work hardening around each crimped indentation.
  • the hardness of the rivet shell in the region of the indentations is at least 20%, preferably at least 30% higher than the hardness of the rivet shell at a point midway between adjacent sets of longitudinally spaced indentations.
  • the proposed rivet of the invention is particularly useful where used in securing soft and pliable materials, for example for securing various of such soft and pliable materials as used in the mud-flaps or stone guards in automobiles.
  • soft and pliable materials for example for securing various of such soft and pliable materials as used in the mud-flaps or stone guards in automobiles.
  • typical softer materials that can advantageously be secured using the present invention include rubbers and elastomeric based plastics.
  • the proposed rivet of the invention is also particularly useful for securing friable plastics components, for instance friable plastics components used in speaker components in automotive applications.
  • friable materials that can advantageously be secured using the present invention include polycarbonate and styrene based polymers.
  • any suitable material may be used for the rivet shell and mandrel.
  • the materials may be the same or different.
  • suitable materials there may be mentioned aluminium alloy rivet bodies and mandrels, stainless steel rivet bodies and mandrels and steel rivet bodies and mandrels, and differing combinations of these materials.
  • the radial indentations in the rivet shell are formed by a crimping process.
  • the process is advantageously a radial crimping process.
  • the nature of the radial crimping process of the invention allows indentation depth to be precisely controlled.
  • the depth of an indentation, prior to the setting process is in the range 0.20 to 0.26 mm, preferably about 0.23 mm, with a tolerance of less than 0.030 mm, preferably less than 0.020 mm, especially preferably less than 0.015 mm.
  • the depth of an indentation is 15 to 30%, preferably 20 to 25% of the thickness of the shell, prior to the setting process.
  • each set of radial indentations comprises between two and eight individual indentations.
  • the shape of each indentation is generally circular with outwardly sloping edges, or angled flanks. This shape helps to force the rivet shell into tight assembly with the mandrel. It also introduces work hardening.
  • FIG. 1 is a longitudinal section through a blind rivet according to the invention, showing the hardness at various points a to g along the rivet;
  • FIGS. 2 a to 2 e are side elevational views of the blind rivet of FIG. 1, at sequential stages in the setting process of the blind rivet;
  • FIGS. 3 a and 3 e are side sectional views through the blind rivet of FIGS. 2 a and 2 e respectively, taken along line Y-Y (shown in FIG. 2 a ) in each case;
  • FIG. 4 a is a cross-sectional view of the rivet of FIG. 2 a, taken along the line Z-Z of FIG. 2 a;
  • FIG. 1 shows a blind rivet 2 according to the invention. It comprises a hollow substantially cylindrical shell 4 , and a solid substantially cylindrical mandrel 6 extending through the shell.
  • the shell has an outwardly extending flange 8 at one end forming a rivet head.
  • the mandrel 6 also has a head 10 at the end of the mandrel which abuts the blind end of the shell 4 , remote from the head 8 of the shell.
  • the shell 4 comprises a first set of four radial indentations 12 spaced at a distance of 4 mm from the shell flange 8 , the said four indentations being uniformly spaced around the circumference of the shell 4 , at the same longitudinal separation of 4 mm from the flange 8 of the shell 4 .
  • the shell also comprises a second set of four radial indentations 14 , similarly uniformly spaced around the circumference of the shell, at a distance of 7.5 mm from the shell flange 8 , and a third set of four radial indentations 16 , also similarly uniformly spaced around the circumference of the shell, this time at a distance of 13.7 mm from the shell flange 8 .
  • Each set of radial indentations is produced by a radially applied crimping process after assembly of the mandrel 6 within the shell 4 .
  • material is displaced, some radially inwardly to touch the mandrel 6 , but most being displaced longitudinally.
  • the control of the depth of the radial crimping can be accurately controlled by virtue of the mechanically controlled crimping dies that are preferably used.
  • Such a radial crimping process gives more precise depth control that the roll method of grooving which has commonly been used in the manufacture of prior art multigrip rivets; roll methods of grooving being influenced by the hardness of the rivet body material and flexibility in the roll forming mechanisms.
  • the rolling of stainless steel and PTFE coated aluminium is more difficult and the indentation by crimping method of the present invention can achieve a high degree of consistency and accuracy in these and other materials.
  • the blind rivet of FIG. 1 was sectioned longitudinally along its centre line, prepared metallographically and a micro-hardness profile carried out.
  • Table 1 shows the hardness values of the shell 4 at points (a) to (g) as marked on FIG. 1, being various distances from the shell flange 8 .
  • the term MHV 0.5 as used in Table 1 means Micro Hardness Value with a 500 g applied indent load.
  • the hardness value of the shell 4 of the rivet is significantly higher in the vicinity of each of the sets of radial indentations than at positions away from the radial indentations. Indeed the hardness in the vicinity of the radial indentations is more than 30% higher than at positions longitudinally between the sets of radial indentations. The increased hardness is thought to be caused by local work hardening resulting from the radial crimping process.
  • FIGS. 2 a to 2 e, and 3 a and 3 e show sequential steps in the blind rivet setting process.
  • FIG. 2 a shows the position prior to setting.
  • FIG. 3 a which is a longitudinal section also prior to setting, shows that the mandrel 6 has a predetermined point of weakness provided by a thinned section 17 . This is positioned longitudinally between crimped indentations 14 and 16 of the shell, prior to the setting process.
  • FIG. 2 b show the initial stage of setting.
  • the mandrel head 10 has started to enter the rivet shell 4 causing locally greater swelling in the region 18 between the mandrel head 10 and the first indentation 16 of shell 4 .
  • region 24 between the second and third sets of indentations 14 and 16 there is some swelling of region 24 between the second and third sets of indentations 14 and 16 , but this is less than in the other regions 18 , 20 and 22 , because of the greater longitudinal separation between indentations 14 and 16 compared with the separation between head 10 and indentations 16 , or between flange 8 and indentations 12 , or between indentations 12 and 14 .
  • the indentations 12 14 and 16 have also started to collapse axially.
  • the extent of the entry of the mandrel head 10 is limited by the position of the nearest set of crimped indentations from the mandrel head 10 , i.e., the position of the third set of indentations 16 .
  • the mandrel head is not only fully entered but also locked into the rivet shell 4 .
  • This locking can be best seen from the longitudinal section of FIG. 3 b, where gripping contact is made between the shell 4 and the mandrel 6 in the region of each of the collapsed radial indentations 12 , 14 and 16 .
  • Typical holes may have a diameter in the range 4 to 6 mm for example.
  • the amount of axial collapse is controlled by position of the lowest set of radial indentations 12 relative to the flange 8 on the shell 4 .
  • the plate thickness may be in the range 2 mm to 13.5 mm, depending on the length of the rivet.
  • FIG. 2 e shows the fully set position. At this point the crimped indentations 12 , 14 , 16 have completely axially collapsed. This is best seen by looking at sectional view of FIG. 3 b. The collapse of the indentations effectively stops any further longitudinal collapse of the rivet shell 4 , and firmly locks the mandrel 6 in place. At this stage the lower end of the mandrel 6 breaks off at the break point 17 , while the head 10 of the 30 mandrel and the shank portion below the head are retained and locked within the rivet shell 4 .
  • FIG. 4 a is a cross-sectional view through the line Z-Z of FIG. 2 a. From this view the shape of each set of radial indentations 16 can be seen. Each indentation 16 is generally circular in shape with angled flanks 19 . This shape helps to force the rivet shell 4 into a tight assembly with a mandrel 6 . At the same time it introduces local work hardening, as described with reference to FIG. 1 and Table 1.
  • the outer radius of the shank of the shell of the rivet, indicated by reference R 1 in FIG. 4 a is 2.38 mm
  • the inner radius of the indentation i.e. from the centre of the shell to the base of the indentation
  • the depth of the indentation is therefore 0.23 mm.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)
US10/004,552 2000-12-21 2001-12-05 Blind rivet Abandoned US20020119024A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/541,943 US7396287B2 (en) 2000-12-21 2006-10-02 Blind rivet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0031251.2 2000-12-21
GBGB0031251.2A GB0031251D0 (en) 2000-12-21 2000-12-21 Blind rivet

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/541,943 Continuation US7396287B2 (en) 2000-12-21 2006-10-02 Blind rivet

Publications (1)

Publication Number Publication Date
US20020119024A1 true US20020119024A1 (en) 2002-08-29

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US10/004,552 Abandoned US20020119024A1 (en) 2000-12-21 2001-12-05 Blind rivet
US11/541,943 Expired - Lifetime US7396287B2 (en) 2000-12-21 2006-10-02 Blind rivet

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Application Number Title Priority Date Filing Date
US11/541,943 Expired - Lifetime US7396287B2 (en) 2000-12-21 2006-10-02 Blind rivet

Country Status (6)

Country Link
US (2) US20020119024A1 (de)
EP (1) EP1217229B1 (de)
JP (1) JP4255231B2 (de)
DE (1) DE60113051T2 (de)
ES (1) ES2247025T3 (de)
GB (1) GB0031251D0 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050158138A1 (en) * 2004-01-21 2005-07-21 Stefan Schneider Blind rivet nut
US20060182512A1 (en) * 2005-02-11 2006-08-17 Williams Michael K Frangible blind rivet
US20070264099A1 (en) * 2006-05-10 2007-11-15 Joker Industrial Co., Ltd. Expansion screw
US20100068001A1 (en) * 2006-11-30 2010-03-18 Sumanjit Singh Rivet
US20140314513A1 (en) * 2011-08-26 2014-10-23 Newfrey Llc Blind rivet with a plastic rivet body
US20150040374A1 (en) * 2007-01-16 2015-02-12 Harry E. Taylor Blind rivet setting method
US20180214934A1 (en) * 2017-01-30 2018-08-02 GM Global Technology Operations LLC Blind flow screw joining of materials

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10046809C2 (de) * 2000-09-21 2002-11-07 Alfons Knoche Korrosionsfester Niet und Verfahren zu seiner Herstellung
US7198444B2 (en) * 2002-05-22 2007-04-03 Newfrey Llc Multi-grip blind rivet
GB2464674C (en) * 2008-10-20 2013-04-03 Avdel Uk Ltd Blind fastener
DE102010017296A1 (de) * 2010-06-08 2011-12-08 Newfrey Llc Blindniet und Befestigungsanordnung mit einem Blindniet
DE102011113362A1 (de) * 2011-09-15 2013-03-21 Newfrey Llc Blindniet und Werkstückanordnung
US9016992B2 (en) * 2012-11-14 2015-04-28 The Boeing Company Bushing assemblies, bushing assembly kits, apparatuses including bushing assemblies, and associated methods
US8987612B2 (en) 2012-11-26 2015-03-24 The Boeing Company Bushings, apparatuses including bushings, and associated methods
US9573187B2 (en) * 2013-03-15 2017-02-21 Sps Technologies, Llc Blind, bulbing, tacking rivet and method of installation
US11293471B2 (en) 2016-04-14 2022-04-05 U.S. Farathane Corporation Injection molded rivet-style fastener and housing with snap assembly functionality along with an injection molding process for producing such a rivet without an undercut feature
US20170298976A1 (en) 2016-04-14 2017-10-19 U.S. Farathane Corporation Injection molded rivet-style fastener and housing with snap assembly functionality along with an injection molding process for producing such a rivet without an undercut feature
DE102018111049A1 (de) * 2018-05-08 2019-11-14 Böllhoff Verbindungstechnik GmbH Verbindung zwischen zwei bauteilen mit toleranzausgleich sowie ein verbindungsverfahren hierfür

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Publication number Priority date Publication date Assignee Title
DE8430648U1 (de) 1985-01-17 Alfred Honsel Nieten - und Metallwarenfabrik GmbH & Co, 5758 Fröndenberg Blindniet für unterschiedlich dicke Klemmbereiche
US1365719A (en) 1919-08-18 1921-01-18 Ogden John Edward Machine-bolt anchor
US2324142A (en) 1941-04-03 1943-07-13 Rolyan Corp Rivet and method of making same
US2385831A (en) * 1942-11-07 1945-10-02 Cherry Rivet Company Rivet manufacture
GB1029654A (en) * 1961-06-19 1966-05-18 Avdel Ltd Improvements in or relating to fasteners for use in, and to methods of, blind riveting of apertured members
US3414965A (en) * 1964-04-20 1968-12-10 Olympic Screw & Rivet Corp Blind rivet assembly and method of making and using same
US3463046A (en) * 1967-12-11 1969-08-26 Emhart Corp Blind fastening rivet and method of making same
IT1175797B (it) * 1984-06-21 1987-07-15 Oggionni Tac Riveting Syst Sas Rivetto cieco,a strappo,provvisto di un corpo tubolare suscettibile di ritrarsi,per azione del mandrino,formando una o piu' espansioni circonferenziali,di ritegno dei pezzi da unire
GB8702155D0 (en) 1987-01-30 1987-03-04 Avdel Ltd Break-stem blind rivet
DE4343171C2 (de) * 1993-12-17 1996-08-08 Gesipa Blindniettechnik Blindniet und Verfahren zu seiner Herstellung
GB2288649A (en) * 1994-04-14 1995-10-25 Avdel Systems Ltd Blind rivet
GB2346943A (en) * 1999-02-19 2000-08-23 Emhart Inc Blind rivet with circumferential grooves and axial ribs

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7223056B2 (en) * 2004-01-21 2007-05-29 Newfrey Llc Blind rivet nut
US20050158138A1 (en) * 2004-01-21 2005-07-21 Stefan Schneider Blind rivet nut
US7722303B2 (en) 2005-02-11 2010-05-25 Newfrey Llc Frangible blind rivet
US20060182512A1 (en) * 2005-02-11 2006-08-17 Williams Michael K Frangible blind rivet
US20070264099A1 (en) * 2006-05-10 2007-11-15 Joker Industrial Co., Ltd. Expansion screw
US8348565B2 (en) * 2006-11-30 2013-01-08 Sumanjit Singh Rivet
US20100068001A1 (en) * 2006-11-30 2010-03-18 Sumanjit Singh Rivet
US20150040374A1 (en) * 2007-01-16 2015-02-12 Harry E. Taylor Blind rivet setting method
US9481027B2 (en) * 2007-01-16 2016-11-01 Harry E. Taylor Blind rivet setting method
US20140314513A1 (en) * 2011-08-26 2014-10-23 Newfrey Llc Blind rivet with a plastic rivet body
US9109618B2 (en) * 2011-08-26 2015-08-18 Newfrey Llc Blind rivet with a plastic rivet body
US20180214934A1 (en) * 2017-01-30 2018-08-02 GM Global Technology Operations LLC Blind flow screw joining of materials
US10675671B2 (en) * 2017-01-30 2020-06-09 GM Global Technology Operations LLC Blind flow screw joining of materials

Also Published As

Publication number Publication date
EP1217229A2 (de) 2002-06-26
DE60113051D1 (de) 2005-10-06
DE60113051T2 (de) 2006-04-27
ES2247025T3 (es) 2006-03-01
JP4255231B2 (ja) 2009-04-15
US20070147971A1 (en) 2007-06-28
US7396287B2 (en) 2008-07-08
GB0031251D0 (en) 2001-01-31
EP1217229B1 (de) 2005-08-31
JP2002213422A (ja) 2002-07-31
EP1217229A3 (de) 2003-02-05

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AS Assignment

Owner name: EMHART LLC, DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JENNINGS, GARY;PROBERT, PETER CHRISTOPHER;REEL/FRAME:012850/0363

Effective date: 20020124

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Owner name: NEWFREY LLC, DELAWARE

Free format text: CHANGE OF NAME;ASSIGNOR:EMHART LLC;REEL/FRAME:013516/0757

Effective date: 20021030

STCB Information on status: application discontinuation

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