GB2126142A - Riveting - Google Patents

Abstract

A riveting device 1 incorporates, pilot head 3 from which protrudes a guided punch 2 for radially expanding the base of the tubular rivet 4. The other end of the rivet 4 has an outer flange 5 on which the pilot head 3 rests. The base of the rivet 4 has an inner flange 6 which is deformed by the punch 2 to form the inner flange 6 into an outer flange. Instead of being provided with a flange 4, the rivet may be internally tapered. <IMAGE>

Description

SPECIFICATION Riveted joining device The present invention refers to a riveted joining device, the purpose of which is to join laminar bodies, such as thin plates and similar elements which can be rigid or not.

The system frequently used as the most suitable means to join the laminar elements or bodies manufactured in determined industries.

irrespective of the material used to obtain such laminar bodies or elements, is the riveting system.

The mentioned riveting which, as stated, determines the joining of laminar bodies and the like, is necessarily carried out with the help of a riveting machine and a rivet unit.

The technical evolution has developed numerous types of riveting machines and numerous variants in the design of the joining units or rivets themselves, the purpose of which is to facilitate the riveting operation and to achieve, mainly, a substantial saving in time when carrying out the riveting operation itself, whereby the desired joining of the laminar elements or bodies is achieved. Nevertheless, the solutions so far contributed are in the majority of the cases excessively sophisticated and complex, with respect to the riveting apparatus, and with respect to the design of the rivet itself which, although implies a saving in time and hand labour, causes the purchasing price of the necessary elements to be high and the use thereof is not always worthwhile.

Thus, for example, the riveting system utilized in sheet-metal working and in body building to join or seam two or more overlapped plates, use a tubular member constituting the rivet itself, which is joined to a pull head and is provided with an internal stamping, while at the external part thereof it is provided with a flange or peripheral wing constituting a penetration butt in the holes provided therefore in the plates to be joined. Once said tubular member or rivet is introduced, it is necessary to secure the pull head by means of a clamp which, by a mechanical lever effect or by a conventional expanding element which pulls the.

head, forces the stamping to be retracted, forming a fold which, by added thicknesses, determines a widening.

The rivets used in the conventional riveting systems, due to the complexity thereof and the type of material, are too expensive. Likewise, said riveting system presents the drawback that the pull head can only be operated by an expensive and excessively bulky machine, when operated by mechanical means, constituting the main drawback of the system which, in short, limits the possibilities of application thereof.

Thus, in view of these drawbacks and with the purpose of offering the market of the sector with an advantageous, effective and definite solution, from a technical and commercial point of view, the riveted joining device of the present invention is specially designed to solve in a practical manner the joining of laminar bodies or the like which is carried out by the device being referred to, the main and most outstanding characteristic thereof being the simplicity of its components which contribute to the effectiveness of the system and convert it in a practical and competitive assembly, both from a technical and manipulation as well as from an economic-commercial point of view.

In other words, the solution proposed by the present invention is advantageously revolutionary, due to the simplicity thereof and it is specifically designed to be used by both amateurs and professionals where the joining to be carried out should not withstand excessive stresses.

Basically the riveted joining device in question comprises, on the one hand, the riveting machine itself and, on the other, the joining unit or rivet itself, the riveting machine being constituted of a conventional apparatus which, at its percussion front, incorporates a punch guided in a pilot head, while the joining unit or rivet presents two modes of embodiment.

The first embodiment of the joining unit or rivet is comprised of a tubular body having a circular section which, at one of its bases, has an outer annular flange or wing, while at the opposite base it has an inner annular thickening or wing, the base provided with the outer flange receiving the pilot head provided in the conventional riveting machine, while the punch guided in said pilot head penetrates inwardly deforming the inner flange of the other base of the tubular body or rivet, wherefore said deformation causes the mentioned inner flange to be turned outwards and determines an outer flange which, with the outer flange provided in the other base of the rivet, constitutes the riveted joining means for the laminar plates or bodies to be joined.

The second embodiment of the rivet or joining unit is likewise comprised of a tubular body which, at one of its bases is provided with an outer annular flange or wing, as in the preceding embodiment, but in this second embodiment the tubular body constituting the rivet has internally a tapering, the diameter of which diminishes gradually from the previously mentioned base to the opposite base. Said internal tapering of the tubular body of the rivet is pronounced so that it slowly prevents the passage of the punch, finally yielding to the penetration thereof and adopting a cylindrical inner wall with the corresponding deformation which will outwardly determine a thickening corresponding to the base which will be disposed about the outlet of the hole in which said rivet or tubular body is inserted.

Therefore, the device used to join two laminar bodies or the like is based on a conventional riveting machine, the novelty of which resides in the punch which incorporates the percussion front of the riveting machine itself and which punch is guided in a pilot head, said punch penetrating from above to below through the externally thickened base of the tubular body of the rivet, deforming the internal thickening of the opposite base, or the zone of this latter base in the event the internal face of the rivet is tapered, giving rise in either case to an outer wing or flange which insures the final overlapping contact between the plates to be joined, these being joined axially between the two wings or thickenings corresponding to the bases of the tubular body of the rivet, while said plates to be joined are transversally blocked by the stretch of the tubular body comprised between the mentioned thickened bases.

To conveniently illustrate the aforegoing, there is accompanied to this specification, forming an integral part thereof, a set of drawings wherein there has been schematically represented a preferred mode of embodiment of the object of the invention, said set of drawings representing the following: Figure 11 represents a profile view of the conventional riveting machine, illustrating in section the pilot head and the punch protruding therefrom.

Figure 2 illustrates a sectional detail of a joining unit or rivet applied to two laminar bodies to be joined by the mentioned rivet.

Figure 3 illustrates another sectional detail similar to the preceding figure, wherein the rivet is in its definite position once the action of the riveting machine has been received.

Figure 4 represents a perspective view of a second mode of embodiment of a rivet which is provided with longitudinal cuts to illustrate the internal tapering of the rivet.

Figure 5 represents a detailed, sectional view of the two laminar bodies joined by the rivet illustrated in the preceding figure.

Referring to the drawings, the device of the invention comprises, in the first place, a conventional riveting machine 1 whose percussion front incorporates a punch 2 guided in a pilot head 3, so that said punch 2 protrudes out of the head 3 and constitutes a striker which acts as a deformer of the rivet or joining unit.

The mentioned rivet, referring to the first preferred embodiment thereof illustrated in Figures 2 and 3, is comprised of a tubular body 4, one of the bases of which is provided with an outer flange 5 which defines an annular periferic wing, while the opposite base present an inner flange 6.

With this constitution of the rivet, the tubular body 4 constituting same will be inserted in the hole provided in the two laminar bodies 8 to be joined together, so that the periferic wing defined by the outer flange 5 of said tubular body 4 will be supported butting against the outer or more accessible laminar body, while the base provided with the inner flange 6 will be directed towards the other laminar body which will be the inner or more accessible.

Once the rivet or tubular body 4 is positioned as described, the punch 2 will be inserted in the hole defined by the tubular body 4 itself, the pilot head 3 being supported on the periferic wing determined by the outer flange 5, to then activate the lever 9 of the riveting machine 1, causing the punch 2 to withdraw and to be released, whereby the inner flange 6 will be deformed and will be projected outwards to constitute an outer periferic wing or flange 7, similar to the periferic wing or flange 5 corresponding to the opposite base.

Thus, the laminar bodies 8 will be overlapped and joined together, since said laminar bodies 8 are retained and secured between the outer flanges 5 and 7, as illustrated in Figure 3.

Referring to the second embodiment of the rivet or joining unit of the laminar bodies 8, said rivet is likewise comprised of a tubular body 10 which externally has a cylindrical shape, while internally it adopts a tapered shape, the base having a larger diameter being provided with an outer flange 11 which defines an annular periferic wing corresponding to said base, while the base having a smaller diameter lacks all types of flanges or thickenings. Thus, the mentioned rivet or tubular body 10 will be positioned in the hole provided for such purpose in the two laminar bodies 8 to be joined, the annular periferic wing determined by the outer flange 11 being supported on and butting against the outer or more accessible laminar body 8, while the opposite base is arranged in correspondence with the other laminar body 8.

Once the rivet 10 is positioned as described, the punch 2 will be introduced through the hole defined by the tubular body 10, so that due to tapering of said hole, the punch 2 will produce an internal deformation of the tubular body 10, eliminating the tapering thereof and producing the corresponding expansion, to define, opposite to the flange 11, a periferic wing or outer flange 12, wherefore the laminar bodies 8 will be joined together in the same way as the joining carried out by the rivet or tubular body 4, previously mentioned.

It can be deduced from the aforegoing that the device of the present invention contributes numerous advantages derived from the characteristics constituting the assembly and from the distribution of the elements comprising same, that is the elements taking part in the riveting operation are simplified as much as possible, facilitating, in turn, the operation itself so that it can be carried out in the least time possible.

The elements composing the device, that is, the riveting machine and the rivets. are obtained from cheap and readily machinable material, the arrangement thereof being furthermore very simple and rapid, all of this contributing to reduce the costs of obtention and hand labour to constitute a highly competitive and especially effective assembly.

Claims (2)

1. Riveted joining device designed to join together two laminar bodies, such as thin plates, the device in question comprising a conventional riveting machine and respective joining units formed of hollow tubular bodies determining the corresponding rivets, essentially characterized in that the conventional riveting machine incorporates, at its percussion front, a pilot head from which there protrudes a guided punch which radially expands one of the bases of the tubular bodies constituting the joining units or rivets, and in that said tubular bodies or joining units have, in correspondence with one of their bases, an outer annular flange which defines a periferic wing on which the pilot head of the riveting machine rests, while the opposite base of said tubular body presents an inner flange which is deformed by the punch, which penetrates axially along the tubular body itself, whereby said deformation forms an outer annular flange determining another periferic wing which, together with the periferic wing of the opposite base, constitutes the riveted joining means of the two laminar bodies or plates to be joined.

2. Riveted joining device according to claim 1, characterized in that the complete inner face of the tubular bodies constituting the riveted joining unit, is provided with a uniform and gradual tapering, the zone having a larger diameter corresponding to the base provided with the periferic wing, so that the axial penetration of the punch through said base having a larger diameter, will produce the corresponding expansion and deformation of the mentioned tapering to determine in the opposite base an outer annular thickening or periferic wing which, together with the eign of the opposite base, constitutes the riveted joining means of the two laminar bodies or plates to be joined.