WO2009098431A1 - Variable grip blind rivet - Google Patents

Variable grip blind rivet Download PDF

Info

Publication number
WO2009098431A1
WO2009098431A1 PCT/GB2008/050824 GB2008050824W WO2009098431A1 WO 2009098431 A1 WO2009098431 A1 WO 2009098431A1 GB 2008050824 W GB2008050824 W GB 2008050824W WO 2009098431 A1 WO2009098431 A1 WO 2009098431A1
Authority
WO
WIPO (PCT)
Prior art keywords
rivet
shank
longitudinal axis
mandrel
reduced diameter
Prior art date
Application number
PCT/GB2008/050824
Other languages
French (fr)
Inventor
Daniel Robin Smith
Steven Victor Jones
Graham Frank Harry Williams
Harold Martin Bone
John Davies
David John Brookes
Original Assignee
Newfrey 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 Newfrey Llc filed Critical Newfrey Llc
Priority to JP2010544770A priority Critical patent/JP2011511224A/en
Priority to CN200880128404.1A priority patent/CN101981330B/en
Priority to EP08788786.5A priority patent/EP2240700B1/en
Publication of WO2009098431A1 publication Critical patent/WO2009098431A1/en
Priority to US12/850,114 priority patent/US8491243B2/en
Priority to US13/923,995 priority patent/US8851813B2/en

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
    • 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
    • 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

Definitions

  • the present invention relates to blind rivets.
  • Blind rivets are used in a variety of applications, from securing thin sheets to relatively thick components, and in a variety of materials, ranging from steel to plastics.
  • the blind rivet enables lower cost assembly to be achieved, but also contributes to the strength and integrity of the resulting joint or fixing. For example, if a pair of workpiece sheets to be joined are slightly bowed, the rivet needs to clamp the sheets together.
  • a blind rivet is generally required to have high shear strength, and to expand into any clearance between the rivet body and a hole in the workpiece into which the rivet is inserted, in order to prevent the sheets of the workpiece from fretting under applied vibrations or oscillating applied loads . This is especially important in the automotive industry.
  • the rivets when set should have a single roll-type bulged setting on the blind side of the workpiece, giving an increased tensile resistance to applied loading, while providing an aesthetic appearance.
  • the mandrel of the rivet break flush in the region of the rivet flange, contributing to an increase in the shear resistance of the joint.
  • the mandrel head is required to be fixed to the tail end of the rivet body on assembly and to remain in place during and after setting, thus contributing to the resistance to moisture ingress through the bore of the rivet body.
  • rattling of the mandrel head within the set rivet is avoided.
  • EP 0677666 discloses a blind rivet having a recess beneath the mandrel head of the rivet.
  • the tail end of the rivet body is crimped into an elliptically shaped recess beneath the mandrel head, and a further indentation is provided near to a flange portion of the rivet body.
  • GB 402813 shows a blind rivet having a mandrel head having a bevelled surface beneath the head. This rivet suffers from the drawback that it has a relatively narrow grip range.
  • GB 2231932 shows a blind rivet having a mandrel provided with grooves beneath its head.
  • the tail of the rivet body is swaged into the grooves to retain the mandrel in place during manufacture.
  • that part of the rivet body swaged to the mandrel beneath the mandrel head bulges and begins to be forced outwards and out of engagement with the grooves in the mandrel stem.
  • the mandrel grooves then move into engagement with the internal bulge bore and the mandrel is locked in place.
  • this rivet suffers from the drawback that there is often insufficient engagement of the mandrel to the rivet body to prevent movement of the mandrel head relative to the rivet body.
  • this rivet has the disadvantage of providing a multi-fold rather than a single roll-type setting.
  • US 6004086 discloses a blind rivet in which the mandrel is provided with grooves beneath the mandrel head. This rivet suffers from the drawback that if the rivet body is formed from stronger material such as steel, the higher setting loads required to set the rivet cause the mandrel head to be pulled into the rivet body before setting is complete .
  • EP 1106845 discloses a blind rivet having a recess beneath the mandrel head, into which the tail end of the rivet body is formed.
  • This rivet suffers from the drawback that the setting load for certain materials such as steel is high and as the maximum load is approached, the end of the rivet body deforms and the internal bore moves away from the recess formed below the mandrel head. This causes a gap to form between the recess and the rivet body, which enables the mandrel head to move relative to the rivet body when the mandrel breaks .
  • GB 2416575 discloses a blind rivet in which a series of annular grooves are provided beneath the mandrel head. Although this type of rivet provides an adequate grip range, the load required to set the rivet is high compared with other blind rivets, as a result of which the mandrel head tends to loosen under recoil forces as the mandrel breaks at completion of setting of the rivet.
  • a rivet comprising:-
  • a rivet body having a first shank adapted to be inserted into a hole in a workpiece and having an axial bore therethrough, and a flange at a first end of the first shank for abutting the workpiece when the first shank is inserted into the hole in the workpiece;
  • a mandrel having a head, for engaging a second end of the first shank, and a second shank adapted to extend through the axial bore and to be pulled by a tool to set the rivet, wherein the head has an abutment portion for abutting the first end of the first shank, and the second shank has a first reduced diameter portion adapted to break when a predetermined tensile is loaded applied thereto during setting of the rivet, and at least one protrusion adjacent said abutment portion for defining a recess for receiving the first end of the first shank during setting of the rivet.
  • this provides the advantage of more securely retaining the mandrel head in the rivet body during setting of the rivet, which prevents movement of the mandrel head relative to the rivet body and prevents subsequent rattling of the mandrel head in the rivet body after setting of the rivet.
  • the rivet body is mounted to the mandrel and has a second reduced diameter portion adjacent the first end of the first shank, and a third reduced diameter portion adjacent the second end of the first shank.
  • This provides the advantage of providing a barrel shaped portion of the rivet body, which assists bulging of the rivet body during setting of the rivet .
  • the rivet body may have an increased diameter portion between said second and third reduced diameter portions, wherein, in a plane through and parallel to the longitudinal axis of the rivet body, the angle between a line connecting the region of maximum external diameter with at least one of the regions of minimum external diameter and the longitudinal axis of the rivet body is between 1.0 degree and 1.9 degree.
  • the rivet may further comprise at least one first groove on said second shank for receiving part of said second shank to define said third reduced diameter portion.
  • At least one said first groove may define a respective first surface inclined at a first acute angle relative to the longitudinal axis of the second shank.
  • At least one said first acute angle may be between 10 degrees and 20 degrees relative to the longitudinal axis of the second shank.
  • the portions of reduced diameter of the rivet body may be arranged on opposite sides of the first reduced diameter portion when the rivet is assembled.
  • the first reduced diameter portion may be defined by a plurality of indentations .
  • the abutment portion may comprise at least one second surface inclined at a respective second acute angle to the longitudinal axis of the second shank.
  • At least one said second acute angle may be between 73 degrees and 78 degrees relative to the longitudinal axis of the second shank.
  • the abutment portion may further comprise a lip arranged radially outwards of the or each said first surface, wherein the lip defines a respective third surface adjacent each said second surface, and wherein the or each said third surface is inclined at a respective third acute angle, smaller than the corresponding said second acute angle, relative to the longitudinal axis of the second shank.
  • At least one said protrusion may comprise a respective first rib.
  • the mandrel head may have at least one fourth surface inclined relative to the longitudinal axis of the second shank for assisting insertion of the rivet into a hole in the workpiece.
  • Figure 1 is a cross sectional elevation view of an assembled blind rivet embodying the present invention
  • Figure 2 is a side elevation view of a head of a mandrel of the rivet of Figure 1;
  • Figure 3 is a cross sectional view from below of the mandrel head of Figure 2;
  • Figure 4 is a cross sectional elevation view along the line A-A in Figure 3;
  • Figure 5 is a cross sectional elevation view along the line B-B in Figure 3;
  • Figure 6 illustrates the rivet of Figure 1 set at various thicknesses.
  • Figure 1 shows a cross sectional elevation view of an assembled blind rivet 2 embodying the present invention.
  • the rivet 2 has a rivet body 4 mounted to a mandrel 6, the rivet body having a first shank 8 and an enlarged diameter flange portion 10 designed to abut a workpiece (not shown) when the first shank 8 is inserted into a hole in the workpiece.
  • a barrel portion 12 formed by two smaller diameter portions 14, 16, extends from the flange portion 10, and a tail end 18 of the rivet body 4 abuts the underside of a head 20 of the mandrel ⁇ .
  • the mandrel head 20 has chamfered outer surfaces 22 to enable easy entry of the rivet 2 into a hole in the workpiece, and a second shank 24 extends from the mandrel head 20 and has a breakneck 26 formed by four indentations provided to enable the second shank 24 to break when a specific tensile load applied to the mandrel 6 is exceeded.
  • each of which forms a tangent 25 to the shank 24 of the mandrel 6 are provided underneath the mandrel head 20, the surfaces 28 each being inclined at an angle of between 73 degrees and 78 degrees, and preferably 75 degrees, relative to the longitudinal axis of the second shank 24.
  • a lip 30 is also provided around the mandrel head 20 to provide resistance to the tendency of the rivet body material to move around the mandrel head 20 as the rivet is being set.
  • a series of grooves 32 are provided between the breakneck 26 and the mandrel head 20, the grooves 32 defining a series of annular ribs 34, 36.
  • the uppermost rib 34 forms a cavity 38 between the mandrel head 20 and the second shank 24, into which material of the rivet body 4 is locked and remains locked during and after the setting process.
  • the presence of the uppermost rib 34 counteracts the tendency for the mandrel head 20 to move inside the rivet body 4 as the mandrel 6 breaks or to move upwards relative to the rivet body 4 under recoil forces caused by the breaking of the mandrel 6.
  • each of the ribs 36 has an inclined surface 40 inclined at between 10 degrees and 20 degrees relative to the longitudinal axis of the mandrel shank 24, but preferably 15 degrees.
  • the rivet body material is swaged into the grooves 32 in order to create the upper reduced diameter portion 16, the lower reduced diameter portion 14 is formed, and the formation of the reduced diameter portions 14, 16 causes a slight bow of the rivet body 4 to form the barrel portion 12 and induce a slight gap 42 (Figure 1) between the bore of the rivet body 4 and the shank 24 of the mandrel 6.
  • the angle of the bow of the outer surface of the rivet body 4 i.e.
  • the angle Ai or A 2 between a respective line 48, 50 connecting the region of maximum external diameter 52 with a respective one of the regions of minimum external diameter 54, 56 and the longitudinal axis 46 of the rivet body 4) is between 1.0 degree and 1.9 degree and is preferably 1.5 degree.
  • the shank 24 of the mandrel 6 is pulled by means of a setting tool (not shown) while the flange 10 is supported by a nosepiece of the setting tool.
  • the rivet body 4 bulges, shortens in length to fill the hole in the workpiece, and then collapses to give a blind side bulge 44, as best seen in Figure 6. Since the bulging or collapse of the rivet body 4 occurs nearer to the end of the body than other types of rivet, the bulge is small, but the bulge causes the body material to move away from engagement with the grooves 32 in the mandrel shank 24.
  • the body material is retained in the recess 38 beneath the mandrel head 20 to lock the mandrel 6 to the rivet body 4 so that the mandrel head 20 and rivet body 4 are more securely attached to each other during and after setting of the rivet. In this way, subsequent rattling of the rivet is avoided, and the integrity and strength of the rivet joint is improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)
  • Connection Of Plates (AREA)

Abstract

A variable grip blind rivet (2) is disclosed. The rivet comprises a rivet body (4) having a first shank (8) adapted to be inserted into a hole in a workpiece and having an axial bore, and a flange (10) at a first end of the first shank for abutting the workpiece when the first shank is inserted into the hole in the workpiece. A mandrel {6} has a head (20), for engaging a second end of the first shank, and a second shank (24) adapted to extend through the axial bore and to be pulled by a tool to set the rivet. The head has an abutment portion (28) for abutting the first end of the first shank, and the second shank has a first reduced diameter portion (26) adapted to break when a predetermined tensile load is applied thereto during setting of the rivet. At least one protrusion (34) adjacent the abutment portion defines an adjacent recess for receiving the first end of the first shank during setting of the rivet.

Description

VARIABLE GRIP BLIND RIVET
The present invention relates to blind rivets.
Blind rivets are used in a variety of applications, from securing thin sheets to relatively thick components, and in a variety of materials, ranging from steel to plastics. The blind rivet enables lower cost assembly to be achieved, but also contributes to the strength and integrity of the resulting joint or fixing. For example, if a pair of workpiece sheets to be joined are slightly bowed, the rivet needs to clamp the sheets together.
A blind rivet is generally required to have high shear strength, and to expand into any clearance between the rivet body and a hole in the workpiece into which the rivet is inserted, in order to prevent the sheets of the workpiece from fretting under applied vibrations or oscillating applied loads . This is especially important in the automotive industry.
It is also generally required that the rivets when set should have a single roll-type bulged setting on the blind side of the workpiece, giving an increased tensile resistance to applied loading, while providing an aesthetic appearance.
In addition, it is generally desirable that the mandrel of the rivet break flush in the region of the rivet flange, contributing to an increase in the shear resistance of the joint. In order to achieve these requirements, especially in the case of higher strength blind rivets, the mandrel head is required to be fixed to the tail end of the rivet body on assembly and to remain in place during and after setting, thus contributing to the resistance to moisture ingress through the bore of the rivet body. In addition, by securing the mandrel head in the rivet body, rattling of the mandrel head within the set rivet is avoided.
EP 0677666 discloses a blind rivet having a recess beneath the mandrel head of the rivet. The tail end of the rivet body is crimped into an elliptically shaped recess beneath the mandrel head, and a further indentation is provided near to a flange portion of the rivet body.
GB 402813 shows a blind rivet having a mandrel head having a bevelled surface beneath the head. This rivet suffers from the drawback that it has a relatively narrow grip range.
GB 2231932 shows a blind rivet having a mandrel provided with grooves beneath its head. On assembly of the rivet, the tail of the rivet body is swaged into the grooves to retain the mandrel in place during manufacture. As the mandrel stem is pulled to set the rivet, that part of the rivet body swaged to the mandrel beneath the mandrel head bulges and begins to be forced outwards and out of engagement with the grooves in the mandrel stem. As the bulging process proceeds with setting, and the mandrel continues to move through the rivet body, the mandrel grooves then move into engagement with the internal bulge bore and the mandrel is locked in place. However, this rivet suffers from the drawback that there is often insufficient engagement of the mandrel to the rivet body to prevent movement of the mandrel head relative to the rivet body. In addition, when set in minimum grip thickness, this rivet has the disadvantage of providing a multi-fold rather than a single roll-type setting.
US 6004086 discloses a blind rivet in which the mandrel is provided with grooves beneath the mandrel head. This rivet suffers from the drawback that if the rivet body is formed from stronger material such as steel, the higher setting loads required to set the rivet cause the mandrel head to be pulled into the rivet body before setting is complete .
EP 1106845 discloses a blind rivet having a recess beneath the mandrel head, into which the tail end of the rivet body is formed. This rivet suffers from the drawback that the setting load for certain materials such as steel is high and as the maximum load is approached, the end of the rivet body deforms and the internal bore moves away from the recess formed below the mandrel head. This causes a gap to form between the recess and the rivet body, which enables the mandrel head to move relative to the rivet body when the mandrel breaks .
GB 2416575 discloses a blind rivet in which a series of annular grooves are provided beneath the mandrel head. Although this type of rivet provides an adequate grip range, the load required to set the rivet is high compared with other blind rivets, as a result of which the mandrel head tends to loosen under recoil forces as the mandrel breaks at completion of setting of the rivet.
It can therefore be seen that all of the above rivets suffer from the drawback that it is difficult to secure the mandrel head in the rivet body to a sufficient extent during setting of the rivet. Preferred embodiments of the present invention seek to overcome one or more of the above disadvantages of the prior art.
According to the present invention, there is provided a rivet comprising:-
a rivet body having a first shank adapted to be inserted into a hole in a workpiece and having an axial bore therethrough, and a flange at a first end of the first shank for abutting the workpiece when the first shank is inserted into the hole in the workpiece; and
a mandrel having a head, for engaging a second end of the first shank, and a second shank adapted to extend through the axial bore and to be pulled by a tool to set the rivet, wherein the head has an abutment portion for abutting the first end of the first shank, and the second shank has a first reduced diameter portion adapted to break when a predetermined tensile is loaded applied thereto during setting of the rivet, and at least one protrusion adjacent said abutment portion for defining a recess for receiving the first end of the first shank during setting of the rivet.
By providing at least one protrusion adjacent the abutment portion for defining a recess for receiving the first end of the first shank during setting of the rivet, this provides the advantage of more securely retaining the mandrel head in the rivet body during setting of the rivet, which prevents movement of the mandrel head relative to the rivet body and prevents subsequent rattling of the mandrel head in the rivet body after setting of the rivet.
In a preferred embodiment, the rivet body is mounted to the mandrel and has a second reduced diameter portion adjacent the first end of the first shank, and a third reduced diameter portion adjacent the second end of the first shank.
This provides the advantage of providing a barrel shaped portion of the rivet body, which assists bulging of the rivet body during setting of the rivet .
The rivet body may have an increased diameter portion between said second and third reduced diameter portions, wherein, in a plane through and parallel to the longitudinal axis of the rivet body, the angle between a line connecting the region of maximum external diameter with at least one of the regions of minimum external diameter and the longitudinal axis of the rivet body is between 1.0 degree and 1.9 degree.
The rivet may further comprise at least one first groove on said second shank for receiving part of said second shank to define said third reduced diameter portion.
At least one said first groove may define a respective first surface inclined at a first acute angle relative to the longitudinal axis of the second shank.
At least one said first acute angle may be between 10 degrees and 20 degrees relative to the longitudinal axis of the second shank. The portions of reduced diameter of the rivet body may be arranged on opposite sides of the first reduced diameter portion when the rivet is assembled.
The first reduced diameter portion may be defined by a plurality of indentations .
The abutment portion may comprise at least one second surface inclined at a respective second acute angle to the longitudinal axis of the second shank.
At least one said second acute angle may be between 73 degrees and 78 degrees relative to the longitudinal axis of the second shank.
The abutment portion may further comprise a lip arranged radially outwards of the or each said first surface, wherein the lip defines a respective third surface adjacent each said second surface, and wherein the or each said third surface is inclined at a respective third acute angle, smaller than the corresponding said second acute angle, relative to the longitudinal axis of the second shank.
At least one said protrusion may comprise a respective first rib.
The mandrel head may have at least one fourth surface inclined relative to the longitudinal axis of the second shank for assisting insertion of the rivet into a hole in the workpiece. A preferred embodiment of the invention will now be described, by way of example only and not in any limitative sense, with reference to the accompanying drawings, in which : -
Figure 1 is a cross sectional elevation view of an assembled blind rivet embodying the present invention;
Figure 2 is a side elevation view of a head of a mandrel of the rivet of Figure 1;
Figure 3 is a cross sectional view from below of the mandrel head of Figure 2;
Figure 4 is a cross sectional elevation view along the line A-A in Figure 3;
Figure 5 is a cross sectional elevation view along the line B-B in Figure 3; and
Figure 6 illustrates the rivet of Figure 1 set at various thicknesses.
Figure 1 shows a cross sectional elevation view of an assembled blind rivet 2 embodying the present invention.
The rivet 2 has a rivet body 4 mounted to a mandrel 6, the rivet body having a first shank 8 and an enlarged diameter flange portion 10 designed to abut a workpiece (not shown) when the first shank 8 is inserted into a hole in the workpiece. A barrel portion 12 formed by two smaller diameter portions 14, 16, extends from the flange portion 10, and a tail end 18 of the rivet body 4 abuts the underside of a head 20 of the mandrel β. Referring to Figures 2 to 5, the mandrel head 20 has chamfered outer surfaces 22 to enable easy entry of the rivet 2 into a hole in the workpiece, and a second shank 24 extends from the mandrel head 20 and has a breakneck 26 formed by four indentations provided to enable the second shank 24 to break when a specific tensile load applied to the mandrel 6 is exceeded.
Four inclined surfaces 28 r each of which forms a tangent 25 to the shank 24 of the mandrel 6, are provided underneath the mandrel head 20, the surfaces 28 each being inclined at an angle of between 73 degrees and 78 degrees, and preferably 75 degrees, relative to the longitudinal axis of the second shank 24. A lip 30 is also provided around the mandrel head 20 to provide resistance to the tendency of the rivet body material to move around the mandrel head 20 as the rivet is being set.
A series of grooves 32 are provided between the breakneck 26 and the mandrel head 20, the grooves 32 defining a series of annular ribs 34, 36. The uppermost rib 34 forms a cavity 38 between the mandrel head 20 and the second shank 24, into which material of the rivet body 4 is locked and remains locked during and after the setting process. The presence of the uppermost rib 34 counteracts the tendency for the mandrel head 20 to move inside the rivet body 4 as the mandrel 6 breaks or to move upwards relative to the rivet body 4 under recoil forces caused by the breaking of the mandrel 6.
Other than the uppermost rib 34, each of the ribs 36 has an inclined surface 40 inclined at between 10 degrees and 20 degrees relative to the longitudinal axis of the mandrel shank 24, but preferably 15 degrees.
In order to form the assembled rivet 2, the rivet body material is swaged into the grooves 32 in order to create the upper reduced diameter portion 16, the lower reduced diameter portion 14 is formed, and the formation of the reduced diameter portions 14, 16 causes a slight bow of the rivet body 4 to form the barrel portion 12 and induce a slight gap 42 (Figure 1) between the bore of the rivet body 4 and the shank 24 of the mandrel 6. The angle of the bow of the outer surface of the rivet body 4 (i.e. in a plane through and parallel to the longitudinal axis 46 of the rivet body 4, the angle Ai or A2 between a respective line 48, 50 connecting the region of maximum external diameter 52 with a respective one of the regions of minimum external diameter 54, 56 and the longitudinal axis 46 of the rivet body 4) is between 1.0 degree and 1.9 degree and is preferably 1.5 degree.
In order to set the rivet 2, the shank 24 of the mandrel 6 is pulled by means of a setting tool (not shown) while the flange 10 is supported by a nosepiece of the setting tool. As the shank 24 of the mandrel 6 is pulled, the rivet body 4 bulges, shortens in length to fill the hole in the workpiece, and then collapses to give a blind side bulge 44, as best seen in Figure 6. Since the bulging or collapse of the rivet body 4 occurs nearer to the end of the body than other types of rivet, the bulge is small, but the bulge causes the body material to move away from engagement with the grooves 32 in the mandrel shank 24. However, the body material is retained in the recess 38 beneath the mandrel head 20 to lock the mandrel 6 to the rivet body 4 so that the mandrel head 20 and rivet body 4 are more securely attached to each other during and after setting of the rivet. In this way, subsequent rattling of the rivet is avoided, and the integrity and strength of the rivet joint is improved.
It will be appreciated by persons skilled in the art that the above embodiment has been described by way of example only, and not in any limitative sense, and that various alterations and modifications are possible without departure from the scope of the invention as defined by the appended claims.

Claims

1. A rivet comprising :-
a rivet body having a first shank adapted to be inserted into a hole in a workpiece and having an axial bore therethrough, and a flange at a first end of the first shank for abutting the workpiece when the first shank is inserted into the hole in the workpiece; and
a mandrel having a head, for engaging a second end of the first shank, and a second shank adapted to extend through the axial bore and to be pulled by a tool to set the rivet, wherein the head has an abutment portion for abutting the first end of the first shank, and the second shank has a first reduced diameter portion adapted to break when a predetermined tensile is loaded applied thereto during setting of the rivet, and at least one protrusion adjacent said abutment portion for defining a recess for receiving the first end of the first shank during setting of the rivet.
2. A rivet according to claim 1, wherein the rivet body is mounted to the mandrel and has a second reduced diameter portion adjacent the first end of the first shank, and a third reduced diameter portion adjacent the second end of the first shank.
3. A rivet according to claim 2, wherein the rivet body has an increased diameter portion between said second and third reduced diameter portions, wherein, in a plane through and parallel to the longitudinal axis of the rivet body, the angle between a line connecting the region of maximum external diameter with at least one of the regions of minimum external diameter and the longitudinal axis of the rivet body is between 1.0 degree and 1.9 degree.
4. A rivet according to claim 2 or 3, further comprising at least one first groove on said second shank for receiving part of said first shank to define said third reduced diameter portion.
5. A rivet according to claim 4, wherein at least one said first groove defines a respective first surface inclined at a respective first acute angle relative to the longitudinal axis of the second shank.
6. A rivet according to claim 5, wherein at least one said first acute angle is between 10 degrees and 20 degrees relative to the longitudinal axis of the second shank.
7. A rivet according to any one of claims 3 to 6, wherein the portions of reduced diameter of the rivet body are arranged on opposite sides of the first reduced diameter portion when the rivet is assembled.
8. A rivet according to any one of the preceding claims, wherein the first reduced diameter portion is defined by a plurality of indentations.
9. A rivet according to any one of the preceding claims, wherein the abutment portion comprises at least one second surface inclined at a respective second acute angle to the longitudinal axis of the second shank.
10. A rivet according to claim 9, wherein at least one said second acute angle is between 73 degrees and 78 degrees relative to the longitudinal axis of the second shank.
11. A rivet according to claim 9 or 10, wherein the abutment portion further comprises a lip arranged radially outwards of the or each said second surface, wherein the lip defines a respective third surface adjacent each said second surface, and wherein the or each said third surface is inclined at a third acute angle, smaller than the corresponding said second acute angle, relative to the longitudinal axis of the second shank.
12. A rivet according to any one of the preceding claims, wherein at least one said protrusion comprises a respective first rib.
13. A rivet according to any one of the preceding claims, wherein the mandrel head has at least one fourth surface inclined relative to the longitudinal axis of the second shank for assisting insertion of the rivet into a hole in the workpiece.
PCT/GB2008/050824 2008-02-04 2008-09-15 Variable grip blind rivet WO2009098431A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2010544770A JP2011511224A (en) 2008-02-04 2008-09-15 Variable grip type blind rivet
CN200880128404.1A CN101981330B (en) 2008-02-04 2008-09-15 Variable grip blind rivet
EP08788786.5A EP2240700B1 (en) 2008-02-04 2008-09-15 Variable grip blind rivet
US12/850,114 US8491243B2 (en) 2008-02-04 2010-08-04 Variable grip blind rivet
US13/923,995 US8851813B2 (en) 2008-02-04 2013-06-21 Variable grip blind rivet

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB0801996.0A GB0801996D0 (en) 2008-02-04 2008-02-04 Variable grip blind rivet
GB0801996.0 2008-02-04
GB0803118A GB2457105B (en) 2008-02-04 2008-02-21 Variable grip blind rivet
GB0803118.9 2008-02-21

Publications (1)

Publication Number Publication Date
WO2009098431A1 true WO2009098431A1 (en) 2009-08-13

Family

ID=39204177

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2008/050824 WO2009098431A1 (en) 2008-02-04 2008-09-15 Variable grip blind rivet

Country Status (7)

Country Link
US (2) US8491243B2 (en)
EP (1) EP2240700B1 (en)
JP (2) JP2011511224A (en)
KR (1) KR20100114919A (en)
CN (1) CN101981330B (en)
GB (2) GB0801996D0 (en)
WO (1) WO2009098431A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010017296A1 (en) 2010-06-08 2011-12-08 Newfrey Llc Blind rivet and mounting arrangement with a blind rivet
DE102011113362A1 (en) 2011-09-15 2013-03-21 Newfrey Llc Blind rivet and workpiece arrangement
DE102011055724A1 (en) 2011-11-25 2013-05-29 Newfrey Llc rivet bolts
DE102014101110A1 (en) 2014-01-30 2015-07-30 Newfrey Llc Blind rivet arrangement and connection
DE102014104024A1 (en) 2014-03-24 2015-09-24 Newfrey Llc Rivet sleeve, blind rivet and blind rivet setting method
DE102015120278A1 (en) 2015-11-24 2017-05-24 Newfrey Llc Blind rivet assembly and blind riveting method

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2464674C (en) * 2008-10-20 2013-04-03 Avdel Uk Ltd Blind fastener
DE102010002847A1 (en) * 2010-03-15 2011-09-15 Newfrey Llc Blind rivet with a plastic rivet body
DE102011053035A1 (en) * 2011-08-26 2013-02-28 Newfrey Llc Blind rivet with a plastic rivet body
CN102788070A (en) * 2012-07-06 2012-11-21 无锡市锐倍特紧固件有限公司 Sealing rivet
DE102012016592A1 (en) 2012-08-16 2014-02-20 Newfrey Llc blind rivet
US9573187B2 (en) * 2013-03-15 2017-02-21 Sps Technologies, Llc Blind, bulbing, tacking rivet and method of installation
DE102014203635A1 (en) * 2014-02-28 2015-09-03 Bayerische Motoren Werke Aktiengesellschaft Breakstem blind rivets
EP3302848B1 (en) 2015-06-03 2023-07-26 WS Wieländer + Schill Professionelle Karosserie- Spezialwerkzeuge GmbH & Co. KG Method and joining element for joining at least two components by means of a flowable rivet sleeve
KR200489466Y1 (en) * 2017-03-31 2019-10-01 김준영 Rivet for preventing scratch
CN110508712A (en) * 2018-12-28 2019-11-29 广州市科镁隆五金有限公司 A kind of combined type riveted joint bolt production technology
BR112021013585A2 (en) 2019-02-07 2021-09-28 Howmet Aerospace Inc. BLIND FIXER AND INSTALLATION METHOD
US11585363B1 (en) 2019-10-28 2023-02-21 National Technology & Engineering Solutions Of Sandia, Llc Wire rivet
GB2588790B (en) * 2019-11-07 2021-12-29 Avdel Uk Ltd Sealing plug
CN111379776B (en) * 2020-04-14 2024-06-04 眉山中车紧固件科技有限公司 Acorn ring groove blind fastener and installation method thereof
CN113062909A (en) * 2021-03-29 2021-07-02 昆山凯荣精密机电有限公司 Self-plugging rivet with anti-loosening structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149530A (en) 1960-09-19 1964-09-22 Olympic Screw & Rivet Corp Rivet pin and sleeve structure
GB1413592A (en) 1972-02-22 1975-11-12 Standard Pressed Steel Co Blind fastener
US4639174A (en) * 1983-11-17 1987-01-27 Avdel Limited Self-plugging blind rivet

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371423A (en) * 1943-04-17 1945-03-13 B F B Engineers Inc Mandrel extrusion rivet
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
GB1228781A (en) * 1967-08-09 1971-04-21
US3515419A (en) * 1968-07-01 1970-06-02 Huck Mfg Co Container fastener
US3726553A (en) * 1971-07-09 1973-04-10 Huck Mfg Co Two-part pull type positive lock fasteners
US4877362A (en) * 1982-06-04 1989-10-31 Microdot Inc. Sheathed composite blind rivet
US4639175A (en) * 1984-05-15 1987-01-27 Phillips Plastics Corp. Self-sealing expansion rivet assembly
GB8702155D0 (en) * 1987-01-30 1987-03-04 Avdel Ltd Break-stem blind rivet
US5501695A (en) 1992-05-27 1996-03-26 The Anspach Effort, Inc. Fastener for attaching objects to bones
GB2288649A (en) * 1994-04-14 1995-10-25 Avdel Systems Ltd Blind rivet
JPH0842534A (en) * 1994-07-29 1996-02-13 Pop Rivet Fastener Kk Blind rivet made of plastic
JPH10306814A (en) * 1997-04-30 1998-11-17 Ricoh Co Ltd Blind rivet, mandrel therefor, and blind rivet structure
DE29716899U1 (en) * 1997-09-22 1997-11-27 Avdel Verbindungselemente GmbH, 30851 Langenhagen Broken mandrel rivet and device for its processing
WO2000068583A1 (en) * 1999-05-11 2000-11-16 Richard Bergner Verbindungstechnik Gmbh & Co Kg Blind rivet for structural parts of different wall thicknesses and method for producing such a blind rivet
GB2357128A (en) * 1999-12-07 2001-06-13 Emhart Inc Blind rivet
TW492526U (en) * 2001-05-10 2002-06-21 Sedate Entpr Company Improved structure of pop rivet
US6551040B1 (en) * 2001-12-27 2003-04-22 Huck International, Inc. Blind fastener with a blind side head having a clamp support and lock section
GB2389397B (en) * 2002-06-06 2005-08-03 Emhart Llc Peel-type blind rivet
JP4468711B2 (en) * 2004-02-16 2010-05-26 ポップリベット・ファスナー株式会社 Blind rivet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149530A (en) 1960-09-19 1964-09-22 Olympic Screw & Rivet Corp Rivet pin and sleeve structure
GB1413592A (en) 1972-02-22 1975-11-12 Standard Pressed Steel Co Blind fastener
US4639174A (en) * 1983-11-17 1987-01-27 Avdel Limited Self-plugging blind rivet

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9334893B2 (en) 2010-06-08 2016-05-10 Newfrey Llc Blind rivet and fastening arrangement with a blind rivet
WO2011154224A1 (en) 2010-06-08 2011-12-15 Newfrey Llc Blind rivet and fastening arrangement with a blind rivet
CN102933860A (en) * 2010-06-08 2013-02-13 纽弗雷公司 Blind rivet and fastening arrangement with a blind rivet
JP2013528272A (en) * 2010-06-08 2013-07-08 ニューフレイ リミテッド ライアビリティ カンパニー Blind rivet and fastening structure with blind rivet
DE102010017296A1 (en) 2010-06-08 2011-12-08 Newfrey Llc Blind rivet and mounting arrangement with a blind rivet
DE102011113362A1 (en) 2011-09-15 2013-03-21 Newfrey Llc Blind rivet and workpiece arrangement
WO2013037581A1 (en) 2011-09-15 2013-03-21 Newfrey Llc Blind rivet and workpiece arrangement
DE102011055724A1 (en) 2011-11-25 2013-05-29 Newfrey Llc rivet bolts
DE102014101110A1 (en) 2014-01-30 2015-07-30 Newfrey Llc Blind rivet arrangement and connection
DE102014104024A1 (en) 2014-03-24 2015-09-24 Newfrey Llc Rivet sleeve, blind rivet and blind rivet setting method
DE202014011159U1 (en) 2014-03-24 2018-03-15 Newfrey Llc Rivet sleeve and blind rivet
DE102015120278A1 (en) 2015-11-24 2017-05-24 Newfrey Llc Blind rivet assembly and blind riveting method
EP3173635A1 (en) 2015-11-24 2017-05-31 Newfrey LLC Blind rivet arrangement and blind riveting method

Also Published As

Publication number Publication date
US20100329811A1 (en) 2010-12-30
CN101981330A (en) 2011-02-23
JP2014029210A (en) 2014-02-13
GB2457105A (en) 2009-08-05
EP2240700A1 (en) 2010-10-20
JP2011511224A (en) 2011-04-07
US8491243B2 (en) 2013-07-23
GB0801996D0 (en) 2008-03-12
GB0803118D0 (en) 2008-03-26
EP2240700B1 (en) 2014-07-23
CN101981330B (en) 2014-02-12
JP5736425B2 (en) 2015-06-17
KR20100114919A (en) 2010-10-26
GB2457105B (en) 2011-09-21
US20130287516A1 (en) 2013-10-31
US8851813B2 (en) 2014-10-07

Similar Documents

Publication Publication Date Title
EP2240700B1 (en) Variable grip blind rivet
US7887273B2 (en) Blind rivet and method
EP2337959B1 (en) Blind fastener
CA2365976C (en) Blind fastener with high strength blind head and high clamp and high shear load resistance
EP2647851B1 (en) Fastener and method of installing same
US8732936B2 (en) Blind rivet and removal method thereof
JP5374789B2 (en) Plastic blind rivet
US9334893B2 (en) Blind rivet and fastening arrangement with a blind rivet
JP2011516801A (en) Solid rivets for joining composite components
AU685910B2 (en) Blind rivet
US8430613B2 (en) Blind rivet
KR20160114178A (en) Blind rivet arrangement and joint
US20150233409A1 (en) Expansion anchor
WO2006008268A1 (en) A blind rivet
GB2332722A (en) Blind rivet with work hardened groove in shank
JP2024534793A (en) Fastening collar, multi-piece fastener, and fastening method
CN117716137A (en) Fastening collar, multi-piece fastener and method for fastening

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880128404.1

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08788786

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2008788786

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2010544770

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20107019700

Country of ref document: KR

Kind code of ref document: A