FR2530305A1 - COMPOSITE RIVET FOR BLIND POSITION WITH SELF ADJUSTABLE CRIMPING ROD - Google Patents

Abstract

THIS TUBULAR COMPOSITE RIVET INTENDED TO BE LAYED BLIND INCLUDES A CRIMPING ROD 14 WHICH FEATURES AN EXPANDING SKIRT 42 AND AN ANNULAR CUSHION 46 INTENDED TO TIGHTEN PARTS 16, 18 ONE AGAINST ANOTHER AND TO EXPAND THE INACSIBLE END 50 OF RIVET 12 THEN LOCKING THE RIVET AND PARTS ASSEMBLY BY CRIMPING. 80 SPACE CRIMPING RINGS ARE PROVIDED ON THE CRIMPING ROD TO ALLOW THE RIVET TO ADAPT TO 16, 18 PIECES OF DIFFERENT THICKNESSES.

Description

The invention relates to rivets in particular

  bind, it relates to the rivets that can be put in

  place and attached to a room when only one

this from the room.

  It is well known in the art to make rivets that can be set up in a room by the front face of the room, even when the fitter does not have access to the back side. Various types of such rivets

  have been studied to work in many different ways.

  Advanced construction is described and claimed in

  U.S. Patent No. 3,073,205. A rivet comprising

  posite composed of a tubular rivet and a stem of

  weaving The crimping pin is inserted through the former

  tremité was the rivet and emerge outside through the head The emerging end is adapted to be seized to

  using one traction device while the other ex-

  the end of the crimping rod is enlarged to a

  slightly larger than the inside diameter of the tubular rivet. This assembly is positioned through a hole in one or more pieces so that the

  head is on the outer side and the other end

  extends beyond the inaccessible facet of the room -

  When the emergent end of the crimping rod is pulled by a pulling device, it forces the part

  widening of the locking rod, located on the inacces-

  to form a wedge inside the tubular shaft of the

  vet, to dilate the rivet on the inaccessible side of the

  When the inaccessible end of the rivet has been

  latched to a dimension larger than the hole in the room,

  the rivet is fixed in position permanently.

  Although the first rivet construction

  te above has many comparative advantages

  to many other devices of the prior art

  re, the plaintiff found that it would be very desirable

  to equip the technique with a composite rivet in which

  can be used with good results

  weaving and rivets with higher strength

  shearing the fact that increasing the resistance

  Shear stress usually requires a reduction in

  -ductivity in practice imposes limits on the objec-

  high shear strengths that can be seen due to the need to use materials that

  have sufficient ductility - so that we can

  crimp the crimping pin by forcing it inside the

  tubular shaft of the rivet It is also desirable to

  the technique of a composite rivet that is suitable for use with a wide variety of

  parts, that is to say a composite rivet with a

  Crimping geometry that is self-adjusting to crimp the ri-

  Vet without play on thin as well as thick pieces.

  The problems of the prior art that have been cited above can be overcome or largely mitigated by

the present invention -

  The subject of the invention is an appropriate composite rivet

  required to assemble two pieces, such as sheets, when access is only available to one face (called

  in this memo "the front panel") This composite rivet

  is of the general type described above and consists of a

  rivet having an enlarged head, a tubular shaft, a light

  re passing through the barrel and head and a stem of

  The crimping pin has a relatively narrow cylindrical neck small enough to fit in the rivet lumen,

  and a slightly larger cylindrical body, coming from

  and aligned axially on the collar A skirt with blooming

  The intersection between the neck and the body is provided therein, this skirt being connected to the body and extending outwardly surrounding a portion of the neck, and an annular slot terminating in a neck rupture groove being formed between the skirt and the collar The skirt widens, to

  from a relatively narrow end and sufficiently

  small to penetrate the rivet light,

  than an annular bead located at the junction between the skirt and the body of the crimping rod, the bead having a diameter greater than the diameters of the light and

from the adjacent part of the body.

  The body of the stem is also equipped with a

  of ductile crimp rings from

  annular grooves or channels which extend circumferentially around the body, the rings having

  diameters greater than the diameter of the body and

  with a diameter less than the diameter of the body

  that the stem is drawn into the shaft of the rivet, the bead

  ring of the expanding skirt provokes an expan-

  end of the barrel and roll this end towards

  outside, while at the same time tightening it closely

  be the inaccessible face of the inner piece When the body of the rod is drawn into the barrel, the ductile crimp rings are also drawn into the barrel and

  crash into the adjacent channels, the amplitude of the

  crushing and deformation dependent on thickness

parts to river.

  Other features and advantages of the invention

  will be better understood by reading the description

  following an example of implementation and referring to

  FIG. 1 is a perspective view of the composite rivet;

  FIG. 2 is a partial section of the rivet

  posite and traction device, the rivet itself being engaged in holes in a pair of

parts to be assembled; -

  Figure 3 is similar to Figure 2, except that

  the crimping rod of the composite rivet was pulled by

  in the tubular shaft of the rivet; Figure 4 is similar to Figure 3 except that the crimping rod was pulled even further into the rivet shaft; Figure 5 is similar to Figure 4, except that

  the crimping rod was pulled entirely into the

  the skirt of the crimping pin has been deformed and outwardly outwardly engaged with the rivet head; Figure 6 shows the rivet when the riveting operation has been completed and the cylindrical neck of the crimping rod has been torn off the body; Figure 7 is a view similar to Figure 6, except that the rivet is mounted in parts plus m Inc

  Figure 8 is a perspective view of the

  inner portion of an alternative embodiment of a crimping rod according to the invention; Figure 9 is similar to Figure 2 except that it shows the alternative embodiment of the crimping rod; and FIGS. 10 to 12 are similar to FIGS. 4 to 6, except that they show the variant embodiment of FIG.

the crimping rod.

  201 Figure 1 shows a composite rivet 10 compound laid in

  of a 12 "U-shaped rivet / eagle and a seam rod

  FIGS. 2 to 6 show the successive phases of the use of composite rivet 10 for riveting a front piece 16 and a back piece 18

  parts normally consist of two sheets of aluminum

of steel or equivalent.

  Circular holes aligned 20 and 22 are

  in holes The holes are large enough

  to receive the totality of each composite rivet to the ex-

  The outer diameter of the tubular shaft 26 is preferably just slightly smaller than the holes 220 and 22, so that the rivet can

  fits easily into the holes and, however, expands

  to fill the holes completely and without play when

  that the riveting process is complete, as it is

described below.

  The crimping rod 16 comprises a pulling portion 30 which is provided with a series of cords 32 and

  34, as shown in Figure 1.

  30 is one-piece with the cylindrical collar

  The neck 36 is dimensioned so as to be housed in the lumen 38 of the tubular shaft 26. The cylindrical neck is in turn formed integrally with the body 40 of the crimping rod. The body 40, like the cylindrical neck,

  generally consists of a metal cylinder

  sive; however, the diameter may vary over the major

  part of the body length and it is initially lightly

  slightly larger than the inner diameter of the light 38 The body stretches to take a smaller diameter

  when pulled inside the light 38,

  at the same time providing a desired clamping fit between the tubular shaft 26 and the walls of the holes 20 and 22, by radially expanding the walls of the shaft outwardly. The body is also provided with an expanding skirt 42

  widening from a tubular end 44

  than an annular bead 26, which joins the body near the junction between the cylindrical neck and the body.

  The tubular shaft 26 of the rivet is provided with a pin

  expansible 50 at its far end inaccessible

  expansible is also equipped with a counterbalance

  The counterbore is sized to

  allow the end of the skirt to flourish

  nterter, as shown in Figures 2 and 3.

  To mount a rivet in the pieces, we position

  the rivet composite in the holes 20 and 22 of the parts, as shown in Figure 2 A rivet tool 60 comprising a mandrel or pliers 62, attacks the cords 32 and the grooves 34 of the pulling portion 30 of the rod crimping while a presser foot 14 applies a rivet 66 against the front surface 68 of the rivet Le

  chuck or the gripper 62 can therefore pull the crimping rod

  inwards through the tubular shaft lumen 38

  the rivet head while the rivet head is now

  naked firmly against the outer surface 70 of the room

before 16.

  When pulling the crimping pin to engage it within the lumen 38, as shown in FIGS. 2 and 3, the expanding skirt 42 is attracted and compressed into the expandable zone 50 of the tubular shaft 26. as the expanding skirt widens from its relatively narrow end 44 to a bead

  enlarged annular ring 46, it rolls the walls of the tubular barrel.

  radially outwards by compressing the two parts

  these to close the gap 72 (exaggerated in Figure 2) and compress the two pieces one on the other (as one

  see it in Figure 3) while simultaneously blocking them

  against each other, creating an enlarged hip 74 on the tubular shaft 4

  In the preferred embodiment of the invention,

  The annular bead 46 is slightly larger than the diameter of the body 40 so that, in the initial stage of pulling the rod within the barrel, which is shown in FIG. 3, a space is formed. ring between the barrel and the body of the crimping rod

  this way, the only friction resistance that

  the draw of the rod is that which is exerted between the external surface with slope of the skirt with blooming and the

internal surface of the drum.

  When the riveting tool 60 pulls the crimping rod 14 further through the rivet body, as shown in FIG. 4, the annular bead of the

  skirt is compressed at the same time as the

  pe stands up and the skirt and the body 40 of the service rod

  weave dilate the walls of the tubular shaft by applying them

  as against the walls of -outs 20 and 22, which

perfectly the rivet in position.

  The barrel body is also provided with a series of ductile crimp rings 80 separated by grooves

  or grooves 82 The volume of metal of each ring-ser-

  weaving projecting radially outwardly on the body of the crimping pin corresponds to the volume of the adjacent groove or groove

  In this way, when the rod of

  weaving is drawn even further into the tubular bed, as shown in Figures 5 and 6, the ductile crimp rings deform and compress in the

  grooves behind them Simultaneously with the deformation

  of each crimping ring, the radius of rounding

  hip 74 of the tubular shaft 26 is reduced and this han-

  This increases the tensile strength in the case of thin pieces to bring it up to levels comparable to that achieved by compressing the surface 84 of the inaccessible face of the back piece.

on thicker pieces.

  Figure 5 also shows the beginning of the

  expanding the skirt 42, at the moment when it is pressed against the rivet 66 The head 24 of the

  rivet 12 is provided with a recess or an annular milling cutter

  interior 86 whose volume corresponds approximately

  to the volume of metal contained in the blooming skirt.

  In this way, when the expanding skirt is fully expanded and expanded, as shown in FIG. 6, it substantially fills the empty space of the annular recess 86. In this position,

  the blooming skirt is fully compressed linearly

  completely radially dilated in the levi-

  the inaccessible end 90, equipped with the terminating ring

  nal 92, forcibly engages in the expandable area 50 of the

  tubular shaft until it engages or forces itself

  The axial displacement of the crimping rod with respect to the rivet is thus stopped. Then, when the riveting tool 60 tries to draw the crimping rod even further into the tubular barrel, and since the continuation of the movement is stopped by the arrival in abutment

  of the rivet 66 against the skirt 42, the trac-

  the cylindrical neck of the crimping rod

  body 40, at the level of the neck rupture groove 96, which is situated at the base of the expanding skirt and at the junction between the cylindrical neck and the body of the neck.

  the crimping stem The neck rupture throat is con-

  staggered by a groove extending along the circumference.

  it serves to cause the fracture or fracture of the metal to occur along a relatively uniform plane, so that the surface 98 of the fracture is relatively smooth, as shown

in Figure 6.

  When the cervix has been separated from the body,

  the riveting tool and the collar, leaving the head of rivet

  finished vet visible on the front of the room.

  Figure 7 shows a pair of pieces clearly

  thinner than those shown in Figures 2 to 6 as

  sewed by a rivet As can be seen, the rivet

  tee is able to achieve the same type of assembly as

  the one made with thicker pieces This is obtained

  naked by the plurality of ductile crimp rings a and b and adjacent grooves 82 which are spaced along a long portion of the inaccessible end of the crimping rod as shown in FIG. 7, only the first crimping ring 80a is strongly deformed by its penetration into the part of the

  tubular shaft which is in the hole of the

  The use of the same composite rivet on

  these thicker ones will also give satisfactory results.

  to the point where the last crimping ring

  8 Ob is adjacent to the shoulder 74 The composite rivet sec-

  the invention therefore has, as regards the differences

  more room thicknesses, greater flexibility of use than could previously be obtained with

  Such devices, while the forms of

  shown in the drawings show only two

  crimping rings, one can also consider using

  three or more crimping rings, to give

  to these devices the maximum flexibility of use.

  In a preferred embodiment of the invention,

  vention, the crimping rod 14 is replaced by a

  two-piece composite crimp 14a, as shown in FIG.

  8 to 12 This crimping rod 14a comprises a flanged bushing or sleeve 42a which generally corresponds by its function to the expanding skirt 42, as shown in FIGS.

  to 7 The expanding ring or sleeve 42a is suitable for

  tee to fit properly around the cylindrical neck

  36a when the composite crimp rod 14a is assembled

  to clamp parts 16 and 18 to one another,

  as shown in Figures 9 to 12.

  The expanding ring 42a comprises one end

  Tubular mite 44a and the ring terminates with an annular bead 46a When the ring 42a is fitted on the cylindrical neck 36a, it rests on the shoulder 100 of the

  body 40 a of the crimping rod A groove 96 has a break

  neck is formed in the cylindrical neck 36a

  the immediate ring 104, which has a diameter of

  similar to that of the cylindrical neck 36a The ring 104 and the shoulder 100 are separated by a groove 102 formed

  at the junction of the cylindrical neck 36a and the body 40a.

  When the ring 42a is mounted on the cylindrical collar

  drique 36 a and relies on the shoulder 100, it is established

  a fit without play, as shown in Figure 9.

  When pulling the composite crimp rod up and down through the rivet 12, as shown in the figures

  , 11 and 12, the expanding ring 42a is progressively

  compressed axially and expanded outward.

  In this way, the annular bead, after being compressed in the groove 102, efectively blocks the expanding ring 42a on the crimping rod, while the opening of the tubular end 44 blocks or crimps the ring on the rivet swelling in the countersink 86 and filling the latter When the crimping rod is fully drawn into the rivet and crimped on the rivet, as shown in Figure 12, the continuation of the tension exerted on the cylindrical neck 36 has pulls off this neck at the level of the throat 96a of rupture of the neck, leaving across the crimping rod a

  surface 98a which is approximately conforming to the surface

this superior of the rivet.

  Of course, various modifications may be made by those skilled in the art to the devices which have just been described by way of example only.

  limiting without departing from the scope of the invention.

the

Claims (13)

R E V E N D I C AT IO N S   Composite rivet suitable for mounting in a hole (20, 22) of a workpiece or work (16, 18) through the front face thereof without access to the rear face   or inaccessible of that part or work,   in that it comprises a rivet proper (12) of elongated shape, having a head (24) larger than the   hole of the piece (16, 18) and a shank <18) of   propriety to be inserted axially through the-   said hole so that when said head (24) is in contact with the front surface (70) of said piece,   the inaccessible end of the shaft (26) emerges through the-   said hole beyond the inaccessible face (84) of the piece, the head and the barrel having a common light passing through them axially, and a crimping rod (36, 36 a)   elongated, one-piece shape, comprising a   one end (30) at one end, a body (40) for   me cylindrical general at the other end, and a collar   (36) of Eorme lying between this part of   and a body, a weakened portion being provided at the junction between the neck and the body so that when the crimping pin is subjected to tension   excessive axial pressure, the neck pulls from the body to the said   said body (40) has a plurality of crimping rings (80) integrally formed on its circumference   and transversely to its axis, and a skirt to bloom-   hollow, generally frustoconical shape which, at its base,   is joined to said body (40) in the region adjacent to the   said junction with the neck, and which narrows in the di-   rection which moves axially away from the body to end with a small end and which surrounds a portion of the collar adjacent to the junction between the neck and the body, said skirt (42) being spaced from said neck to allow to remain   an annular space between itself and the neck; said   traction and le'col being sized to fit   said light (38) of said rivet, and the tracing portion   emerging from the light through the head (24) of the   when the body (40) of the crimping rod emerges   beyond the orifice of light at the far end said barrel (26).   Composite rivet according to claim 1,   characterized in that the small end (44) of said   st (42) is of substantially circular section   and has an outer diameter no greater than   ameter of said light (38) at the inaccessible end of said fat (26) and in that the base of said expanding skirt has an annular bulge (46) whose diameter is greater than the diameter of said   light (38) at the inaccessible end of the Qt.   Composite rivet according to claim 2, characterized   characterized in that said bead (46) and the fat tubular   re (26) are sufficiently deformable so that, when the crimping rod is driven into said fat (26), by   pulling the pulling portion (30) of the axle (14)   warping beyond the front face of the workpiece (16, 18),   the inaccessible extremity of the fat is progressively   flared and radially outward to take a larger dimension than the hole in the room,   in such a way that the piece is clamped between the head (24) of the   vet and the shaft (26) and expanded, while the bulge (46) of the crimping rod is gradually compressed and stretched to a sufficiently small size to lodge in said f At.   Composite rivet according to claim 3,   characterized in that the volume of said annular space com-   caught between the neck (36) of the crimping rod and said expanding skirt (42) is approximately equal to the volume   of the material of said flowering skirt which is d 4-   placed when the crimping rod (14) is drawn into said barrel.   Composite rivet according to claim 2,   characterized in that the front portion of the head (24) of the rim   vet is equipped with counterbore or countersink (86)   around said lumen (38), said counter-bore or   said milling cutter having a volume sufficient to contain the volume of material of said skirting skirt which extends radially outward beyond the diameter of the lumen (38) when this skirt is blooming to   outside and compressed axially to a sufficient extent   health to form a circumferential collar around   the junction between the neck (36) and the body (40) of the the crimping rod.   Composite rivet according to claim 5,   characterized in that said body (40) comprises a portion   inaccessible end (90) intended to cooperate with the-   said tubular shaft (26) and to withstand further movement   axially from the body to the head (24) of the rivet when the junction between the neck (36) and the body (40) is at the interior of said head (24).   Composite rivet according to claim 6,   characterized in that said plurality of crimping rings   ge (80) is placed at a distance between said   junction (96) between the collar and said inactive terminal portion   widened market (90), and in that the composite composite rivet   further takes a plurality of circumferential grooves   (82) surrounding said body (40), each groove being adjacent   next to the corresponding crimping ring (80) which is directed towards the inaccessible end, each of   crimping rings (80) having an outer diameter exceeding   porier a: the diameter of the light (38) of said barrel.   Composite rivet according to claim 7,   characterized in that said outer diameter of each year   crimp (80) is smaller than the initial diameter   tial of the annular bead (46) of the expanding skirt.   (42) before this skirt is compressed and deformed. nted.   Composite rivet according to claim 7,   i 53 03 05 'characterized in that each crimping ring (80) is sufficiently deformable so that when said rod of   crimping (14) is drawn into said 3 t (26), this   water is gradually stretched and compressed to a   as adjusted in said fat, the material displaced from said ring (80) being compressed in said groove <82) adjacent.   Composite rivet adapted to be secured through a hole (20, 22) of a workpiece or work (16, 18), through the front face, without access to the back or inaccessible side of the workpiece or workpiece structure, characterized in that it comprises: a propreaent said rivet (12) of elongated shape having a head (24) larger than the hole (20,   22) of the part or the work, and a shank (26)   born to be axially insertable through said hole (20, 22), so that when said head is in contact with the surface (70) of the front face of said workpiece or work (16, 18), inaccessible end of said barrel (26) protrudes through said hole, beyond the surface (84) of the inaccessible face of the workpiece or work, said head (24) and said fat (26) having a lumen common (38) which passes axially; and an   elongate crimping rod (14) of a single piece   this, comprising a traction portion (30) of allon-   at one end, a body (40) of generally cylindrical shape   at the other end, and a neck (36) of   between the pulling portion and the cylindrical body, a weakened portion being provided at the junction between the   collar (36) and the body (40) in such a way that when   said crimping rod is subjected to excessive axial tension, the neck (36) pulls from the body (40) to the level   this junction, said body (40) having a plurality of   crimping rings (80) of surrounding material   his appointment and the continuation of the work of the Secretary-General.   a-x, and a hollow-shaped skirt (42) of a shape 5-   generally, it is at its base, is located at said 0305 o body (40) in the region adjacent to the junction between it   body and the collar, and which is shrinking in the direction that   away axially from the body (40) to a small end   (44) this skirt surrounding a portion of the neck (26) which is adjacent to the junction between the collar and the body,   the skirt (42) being spaced from said neck to leave   an annular space between itself and the neck, said pulling portion (30) and the neck (36) being sized to fit into said light (38) of said rivet, and the pulling portion emerging from the light, through the head (24) of the rivet when the body (40) of the rod is flooded   beyond the orifice of light at the far end   said dat (26); said plurality of crimp rings   wise (80) being placed at a certain distance between   junction between the neck and the body and the   transferable (90) of said body, and this composite rivet comprises   further comprising a plurality of circumferential grooves   (82) surrounding said body, each groove (82) being   lies at the side of the corresponding crimping ring which is directed towards the inaccessible end, each of   Segment rings (80) having an outer diameter exceeding   less than the diameter of the light (38) of said fat (26).   Composite rivet according to claim 10, characterized in that said outer diameter of each crimping ring (80) is smaller than the diameter   said base of said expanding skirt (42).   Composite rivet according to claim 10, characterized in that each crimping ring (80) is   suffi cient to ensure that when the set stem is   weaving (14) is pulled into said fat (26) by pulling said pulling portion (30) axially beyond the   front face (70) of the workpiece or work (16, 18), the   said ring be gradually stretched and co-pr L; up to a dimension such that it fits into said barrel (26), the material of this ring being displaced being compressed in said adjacent groove (82).   2530305 e 13 Rivet CO Mn PO 5 ite appr Suitable for being fi xed through a hole (20, 22) of a part or a work (16, 18), from the front face sari acs to the rear fzac or   inaccessible of this work, characterized in that it includes   takes a rivet proper (12) of elongate shape, having a head (24) greater than the hole (20, 22) of the hole or 1 of the opening (16, 18) and a fat < 26) adapted to engage the beam through said hole <20, 22) such that when said tite <214) is in contact with the surface of the front face (70) of the peeoe of the structure , letéiéiacstl dadit was emerging at a disadvantage said hole (20, 22) beyond the surface of the inaccessible face (84) of the part or the works, the head <24) and the barrel (26 ) having a common lumen (38) passing therethrough, axially: (a) having a composite crimp (14a) comprising a pop-up ring (42a) and a crimping rod, said crimping rod having an elongated neck (36a) having a portion of tractive material and having a body of genomic uretic form (40a) with an exceptionally inaccessible portion, and a portion of a Lon bond between said collar <3 i Sa) and said body   a weakened part at the junction   It is important to note that when said axial tension is applied to the body, it is necessary to provide an axial tension to the body which allows the elasticity of the rings to be sufficient. Incent around   its first two-year agreement, the said axis,   i c-iii The 3 o th throat crect el 12   ro itellee audit (o'idiu 40 a) and   iacun leo N (15-5zec this body, said elongate neck (36 e> aa) dso to lodge in said light (33) diudit rivet, the par é traction émnergeaIt the lin = head = head <24) of the rivet when the coros de latiereauel of the rlic ad the light located-1   on the side) inaccessible d-tdit rivet, ladit 2 ring to eP-a-   (42 a) having the largest number of   diameter of said elongated neck (36a) and that   liaisoa and smaller than the body diameter Oy-   (40 a) at said shoulder (100) so that the inaccessible end of the ring   (a) abuts against said shoulder (100) when   that said rod is threaded into said bjague to be at- pulled into said rivet.   14 composite rivet according to reveadication 13; characterized in that the small end (44a) of said   ring (42a) is of approximately circular section.   eyepiece e-t has an outer diameter no greater than the diameter of said lumen (38) at the end   inaccessible of said fat (26) and that the inactive end   transferable ring (42a) includes an annular bead (46a) whose diameter is larger than the diameter of said lumen (38) at the end. inaccessible said fat.   Composite rivet according to claim 14, characterized in that said annular bead (46a) and said tubular fat (26) are sufficiently deformable so that when the insertion rod (14a) is drawn into said Eat (26), by pulling the traction portion of this crimping rod axially beyond the front face (70) of the structure (16, 18), the inaccessible end of the shaft is progressively rolled and expanded radially outwardly. to a dimension sapérieulre to that of the hole (20, 22) of the part or the work (16, 18), of manice that this pi-ce o, this work is secreted between the   head (24) of the -rivet and the E Ot bloomed, and-that said bulge-   (46 a) of said self-expanding box (42 a) is   awarded in said circumferential groove (102) of said portion the connection of the crimping rod until   the outer diameter of said ring is sufficiently thin. to lodge in said fat.   Composite rivet according to claim 15,   characterized in that the volute of said throat circon E-   (102) is approximately equal to the volume of the material of said annular bead (46 a) being displaced   when said rod (14 a) and said ring (42 a) are atti-   in the (26). Composite rivet according to claim 16,   characterized in that the front portion of the head (24) of the   vet is unuiae a counter-al-wise (835) which ato -re said light (38), said counter-bore (86) having a sufficient volume polur contain the volume of the material of said ring flourishing (42 a ) which extends radially outwardly beyond the diameter of said lauière (38) when said ring (42 a) is outwardly expanded and compressed axially to a sufficient extent to form a circumferential collar around of said junction between the neck and the part 1 e connection of the crimping rod 18 Composite rivet according to the reveadication 17, characterized in that the body (40 a) comprises an inaccessible end portion (90) intended to attack said   tubular fat (26) and to resist the continuation of the movement   axial axial ddit body to the head (24) of the rivet when said junction between the neck and the 'body is located in said head.