GB2074842A - Rivet and burr assembly - Google Patents

Abstract

A rivet 20, 21 and burr 10, suitable for attachment to a plurality of layers of cloth, coact whereby during fastening the burr 10 is deformed so as to bite upon the shank 20 of the rivet, rendering the assembly able to resist external pulling-apart forces. The burr 10 has an outer plate 11 united via a peripheral rim 13 of the burr to an apertured inner plate 12 which receives the shank 20. The inner plate 12 is of inverted conical form, convergent towards the aperture 14 and away from the outer plate 11, and in setting the rivet and burr is flattened, thereby constricting the aperture 14 and developing the bite upon the shank 20. The plates 11, 12 and rim can be separate. <IMAGE>

Description

SPECIFICATION Rivet and burr assembly This invention relates to improvements in rivets and burrs for use as fasteners or ornaments of apparel and other personal items.

Rivet and burr assemblies, a new variety of apparel fasteners recently introduced into the trade, are in use, for example, for "bar tacking" jeans and other clothing and for reinforcing belts and bags. By "bar tacking" is meant reinforcing sewn parts at points of concentrated strains, such as pocket corners, with a close series of stitches.

However, some fabrics such as denim are thick and often possess too high bending rigidity and elastic recovery to be effectively and easily bar tacked, and so special bar tacking machines are necessary for these materials. As a solution to the problems of bar tacking such materials, rivet and burr assemblies have come into wide use for jeans and other thick clothing. In one rivet and burr assembly, the rivet consists of a needle- or pin-like shank, capable of piercing cloth and being upset once in place, and a flat head having a face to be pressed against the cloth. The burr, on the other hand, consists of an outer plate which gives a decorative appearance and an inner plate adapted to contact the cloth. The inner plate has a central hole for the shank of the rivet, which after insertion is upset to effect the bar tacking of the cloth.

FIG. 1 of the accompanying drawings shows, in exploded form and partly in section, a conventional rivet 1 and a burr 2. The rivet 1 consists of a flat head or flange 3 and a shank 4 formed with a sharp tip as if cut aslant, both being usually made of metal. The burr 2 consists of an outer plate 5, a depending flange or periphery 6, and an inner plate 7, all formed in one piece. The inner plate 7 has a square or circular hole 8 in the center to receive the shank 4 of the rivet. When a rivet and burr assembly is employed for bar tacking, separation of the rivet and burr by external forces would be fatal for the function of the assembly. For practical applications, therefore, it is believed essential that the assembly withstand a pull-apart force of more than 30 kg.

A recent fashion trend is toward wider use of rivet and burr assemblies for ornamenting and "bar tacking" not only jeans but also much thinner cloths. However, the conventional assemblies described above in connection with FIG. 1 are limited as to the thickness of cloth to which they can be applied successfully. The fasteners, if applied to too thin or too thick cloth, can easily come off when subjected to external forces.

Consequently, intensive researches have been made for improvements and it has now been found that rivet and burr assemblies can be successfully set on cloths within a wide range of thicknesses provided the burr structure is modified in accordance with the invention.

The present invention provides improved rivets and burrs which can be positively attached to cloths, despite wide variation in thickness thereof, thanks to the burrs having a special shape and structure on the side which directly contacts the cloth.

According to the present invention, there is provided a rivet and burr in which the rivet has an up-settable shank and the burr to receive the rivet consists of an outer plate and an inner plate, which in use confronts the head of the rivet, the inner plate being united to said outer plate along the periphery of the burr and having a center hole to receive the shank of the rivet, and the inner plate being of inverted conical form convergent away from the outer plate toward the center hole.

The rivet and burr construction defined above is used in the following manner. First, the substrate cloth to be riveted is pierced from one side with the shank of the rivet, and the burr is attached to the other side of the cloth, so that the rivet shank is partly inserted through the mating hole of the inner plate of the burr, and then the two components are pressed against each other by a blow. As the rivet end is upset to form a second head, the inner plate is also deformed in the direction where its taper is reduced, with the result that the center hole constricts and the surrounding plate portion embraces the neck of the shank firmly. This ensures positive attachment of the rivet and burr assembly to the cloth capable of withstanding external forces.

The invention will be described now in more detail by way of example with reference to the remaining accompanying drawings, in which: FIG. 2 is an exploded view, partly in section, of a first embodiment of the invention, FIG. 3 is a plan view of the burr of the first embodiment; FIG. 4 is a sectional view of the first embodiment as attached to a thick cloth; FIG. 5 is a view similar to FIG. 4 but showing the first embodiment attached to a thin cloth; FIG. 6 is an exploded view, partly in section, of a second embodiment of the invention; FIG. 7 is a sectional view of the second embodiment of the invention as attached to a thick cloth; FIG. 8 is a view similar to FIG. 7 but showing the second embodiment attached to a thin cloth; FIG. 9 is a bottom view of a burr modified in accordance with the invention; and FIG. 10 is an exploded view, partly in section, of the modified rivet and burr according to the invention.

Referring now to FIGS. 2 and 3 of the drawings, there is shown the construction of a rivet and burr forming the first embodiment of the invention. The rivet 20 consists of a flat head or flange 21 combined with a shank 22 upstanding from its center. The upper end of the shank 22 is pointed to be easily deformed by upsetting. The burr 10 has a spherically shaped i.e. domed outer plate 11 which in use is outwardly exposed. As viewed from above, burr 10 is circular. The outer plate may have some ornamental pattern or the like, when desired. The burr 10 also has an inner plate 1 2 for direct contact with the cloth to which the assembly of rivet and burr is attached.The inner and outer plates 12, 11 are joined by through a peripheral depending flange or skirt 1 3. These parts are formed integrally by drawing or cupping a metal sheet blank. The inner plate 12 has a square hole 14 formed in the center. The hole may be circular or of any other shape provided it is large enough to receive the shank of the rivet.

As shown in FIG. 2, the inner plate 12 has an outer annular portion 15, bent inwardly and upwardly from the periphery 13 toward the inner plate 12 and the inside surface of the outer plate, and also an inclined portion 1 6 which extends in an opposite direction from the annular portion 1 5.

Portion 1 6 therefore inclines downwardly, away from the outer plate, toward the center hole 1 4.

The angle of inclination may be suitably chosen, for example, as about 30 deg. to the horizontal in FIG. 2. This portion 1 6 is nearly flattened by external forces, when the burr and the rivet are combined and fastened together, and hence the center hole 14 is reduced thus ensuring positive engagement of the fastener components.

FIGS. 4 and 5 illustrate the burr 10 of FIG. 3 in two different applications. FIG. 4 shows an assembly of the burr and rivet when attached to a thick cloth A and FIG. 5, an assembly when attached to a thin cloth A'. In each case, the shank 22 of the rivet shown in FIG. 3 is first forced through the cloth A or A' and inserted into the hole 14 of the burr 10. An upper die having a cavity conforming to the contour of the outer plate 11 and a lower die in contact with the flat flange 21 of the rivet 20 are held against the respective surfaces and are pressed together by a blow or other impact.The portion of the shank 22 of the rivet 20 inserted in the space between the inner and outer plates 11, 1 2 is deformed or buckled to produce an upset bulge or second head 1 7. In addition, as the shank 22 is forced into the space between the inner and outer plates 11, 12, the inclined portion 1 6 of the inner plate is deformed upwardly, from the position indicated by chain lines in Fig. 4 to the solid-line position, by the large-diameter portion of the shank and the cloth portion trapped between the two components.

The inclined portion 1 6 thus bites into the neck of the shank of the rivet, as indicated in FIGS. 4 and 5. This completes the integral union of the rivet and the burr. In case of the thick cloth A, the second head is formed at the upper end of the rivet shank to a size that depends on the thickness.

and elasticity of the cloth A. The second head thus formed secures the rivet and burr in their relative assembled positions as shown. When fitting rivet and burr to thin cloth, a second head 1 7 similar to the one shown in FIG. 4 is formed first. Under an additional upsetting pressure a lower portion of the shank, too, is deformed to produce another bulge 1 8. At the same time, the tapered portion 16 is deformed in the same manner as already described.

It should be clear from the foregoing that, in accordance with the present invention, a rivet and burr combination is provided which can be satisfactorily attached to all types of cloth, thick and thin. By way of comparison, burrs of the same shapes as shown in FIG. 1 and FIG. 3 were made.

The outside diameters were 8.3 mm, the center holes were 2.4 mm square, and the angle to the horizontal of the inclined portion 16 of the burr shown in Fig. 3 was 30 deg. These test burrs were attached to 14 oz. denim, in varied numbers of thicknesses placed one over another. These burrs were used with rivets having common dimensions, i.e., 9 mm in flange diameter and 9 mm in shank length, with the shank tip pointed and rather flattened as if cut aslant, as in FIG. 1. The assembly according to the invention could be attached to form 2 to 1 2 thicknesses of denim stacked together. The conventional assembly, by contrast, could be attached to at most 4-8 thicknesses of denim. On 3 or fewer, and 9 or more thicknesses it tended to be removed by external forces and was often found unusable.This is because deformation of the inner plate of the conventional burr by the rivet shank and cloth under an upsetting pressure is such as to expand the centre hole 8.

A second embodiment of the invention is shown in FIGS. 6 to 8. Referring to FIG. 6, a rivet 20, identical with the one shown in FIG. 3, consists of a flange 21 and a shank 22 upstanding in the center, the shank being pointed at the tip, as if cut aslant, so as to be easily deformed under an upsetting pressure. Burr 30 again has an outwardly exposed, spherically shaped outer plate 31 which is circular in a plan view, and may have some ornamental finish on the surface. The burr also has an inner plate 32 of an inverted conical contour for direct contact with the cloth. This inner plate is securely held around its periphery by an inwardly curled rim 33 along the periphery of the outer plate 31. These two parts are formed separately by drawing or cupping two blanks of metal sheet.The inner plate 32 has a square hole 34 formed in the center, although the hole could be of circular or some other desired shape provided it is large enough to receive the rivet shank. This feature will be described in more detail later.

As FIG. 6 shows, it is important that the inner plate 32 have an inverted conical shape, converging away from the outer plate towards the center hole 34. The angle of taper may be suitably chosen, for example, about 30 deg. to the horizontal in FIG. 6. The conical inner plate 32 is nearly flattened by external forces, when the burr and rivet are combined and fastened together, to narrow the center hole 34, thus ensuring positive engagement of the fastener components. The size of the center hole is chosen to be such that it permits free insertion of the rivet shank before setting and allows the conical inner plate portion around the hole to bite effectively into the shank as the inner plate is nearly flattened under the upsetting pressure.

FIGS. 7 and 8 show the burr 30 of FIG. 6 in two different applications. The burr and a rivet are shown assembled on a thick cloth A in FIG. 7 and on a thin cloth A' in FIG. 8. In either case, the shank 22 of the rivet 20 shown in FIG. 6 is first forced through the cloth A or A' and inserted into the hole 34 of the burr 30. An upper die having a cavity conforming to the domed contour of the outer plate 31 and a lower die in contact with the flange 21 of the rivet 20 are held against the respective surfaces and are pressed together by a blow or other impact. The portion of the shank 22 of the rivet 20 inserted in the space between the inner and outer plates 31, 32 is deformed to produce an upset bulge or second head 37.

Moreover, as the shank 22 is forced into the space between the inner and outer plates 31, 32, the inner plate 32 is deformed upwardly, from the broken-line position (Fig. 7) to the solid-line position, by the large-diameter flange or head portion of the shank and the cloth trapped between the two components. The inner plate thus bites into the neck of the shank 22, as shown in FIGS. 7 and 8. This completes the integral union of the rivet and the burr. In case of the thick cloth A, the second head is formed at the upper end of the rivet shank to a size that depends on the thickness and elasticity of the cloth A. The second head thus formed secures the rivet and burr in the relative position in the assembly. In case of the thin cloth, a second head 37 similar to the one shown in FIG. 7 is formed first.With the exertion of a further upsetting pressure a lower portion of the shank, too, is deformed to produce another bulge 38. At the same time, the inner plate 32 is deformed in the manner described.

It will be understood from the foregoing that the rivet and burr assembly according to the invention, as embodied above, can be successfully attached to various cloths, thick and thin. The burr in the second embodiment consists of two members and is therefore easy to manufacture. A one-piece structure as in the first embodiment inevitably has a greater overall thickness due to the difficulty of bending the peripheral portion 1 3.

The burr 30 of the second embodiment, which does not require the application of any critical or excessive force to the rim, has been found to protrude only slightly from the cloth surface (when fastened thereto by the rivet).

As has been described hereinabove, the present invention provides a rivet and burr of outstanding functional effects. An essential feature of the invention is the downwardly and inwardly inclined or inverted conical inner plate 12 or 32 that can be deformed to reduce its center hole upon exertion of an upsetting pressure. It should be clear, therefore, to those skilled in the art that the outer surface or side of the burr may take whatever shape desired, and not necessarily circular, and that the center hole may take any convenient shape. For example, as illustrated in FIGS. 9 and 10, the center hole may be circular instead of square, and the rivet may have a conically tapered tip on its shank 22'; its head can have a bevelled edge. In FIGS. 6 to 10, like parts are designated by like reference numerals.

Claims (8)

CLAIMS:

1. A rivet and burr in which the rivet has an upsettable shank and the burr to receive the rivet consists of an outer plate and an inner plate which in use confronts the head of the rivet, the inner plate being united to said outer plate along the periphery of the burr, and having a center hole to receive the shank of the rivet, and the inner plate being of inverted conical form convergent away from the outer plate toward the center hole.

2. The rivet and burr according to claim 1, wherein the inner plate of the burr is deformable, when the rivet and burr are assembled and attached to a substrate under an upsetting pressure, to bite into the periphery of the shank of the rivet.

3. The rivet and burr according to claim 1 or claim 2, wherein the outer periphery of the inner plate is closer to the outer plate than the burr periphery, and an inwardly curled annular portion of the burr unites the outer periphery of the inner plate with the said burr periphery.

4. The rivet and burr according to claim 3, wherein the burr periphery forms a rim constituting the inwardly curled annular portion, and the outer periphery of the inner plate is received between the rim and the inside of the outer plate, the two plates being separately formed members.

5. The rivet and burr according to claim 3, wherein said outer and inner plates are connected by an outer peripheral rim forming the burr periphery, the said rim depending vertically downward from the outer periphery of the outer plate and curls inwardly and upwardly in the direction of the outer plate to form said curled annular portion, the rim joining at this point with the inner plate, and the inner and outer plates and the burr periphery being integral with one another.

6. A rivet and burr substantially as herein described with reference to and as shown in Figs.

2 to 5 of the accompanying drawings.

7. A rivet and burr substantially as herein described with reference to and as shown in Figs.

6 to 8 or Figs. 6 to 8 when modified as shown in Figs. 9 and 10 of the accompanying drawings.

8. Burrs for rivet and burr fasteners substantially as herein described with reference to Figs. 2 to 5, or Figs. 6 to 8, or Figs. 6 to 8 when modified as shown in Figs 9 and 10 of the accompanying drawings.