Blind Rivet and Removal Method Thereof
a blind rivet and rivet technology, applied in the direction of threaded fasteners, fastening means, dowels, etc., can solve the problems of removing the temporary fastening, and reducing the installation tension of the riv
Inactive Publication Date: 2008-09-11
ATELIERS DE LA HAUTE GARONNE ETS AURIOL & CIE +2
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- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
[0017]The applicants have undertaken research in view of proposing a blind rivet that is capable of being used within the context of a tack riveting method and in view of improving the tightening tension that said rivet creates between the two pieces of sheet metal it is designed to fasten together.
[0026]The rivet according to the invention is noteworthy in that it comprises a sleeve which, integrally composed of one and the same piece, is preformed from a single tapered portion positioned between the two support surfaces, said tapered portion functioning not to oppose the tensile force, but rather to facilitate the deformation of the sleeve and to enable an installed tension.
[0029]The purpose of this tapered portion is not to create a rupture zone necessitating the management of two pieces for the sleeve but rather to avoid the thickness of the sleeve from hindering the tightening load while also ensuring that the sleeve remains of one and the same integral piece.
[0031]According to another particularly advantageous characteristic of the invention, the length of the tapered portion is less than the smallest span separating the external surfaces of the elements to be fastened / coupled, which ensures that the tapered part is always positioned so as to be included between the two external surfaces serving as rivet support surfaces. In defining a limited length for the tapered zone of the sleeve, the effects of the latter are made possible regardless of the thickness of the assembly formed by the two elements.
[0032]Moreover, the effects are guaranteed by positioning the tapered portion closer to the first support surface defined by the sleeve. This arrangement ensures a large degree of freedom with regard to the length of the sleeve designed to be deformed, thereby increasing the possibilities of thicknesses to be assembled.
[0034]Another particularly advantageous characteristic of the invention is that the removal of the rivet of the invention is achieved by the resumption of the tension effort that will ensure a rupture of the sleeve at the level of its bulb so as to permit removal, by way of the fastening openings, of the mandrel and of a first portion of the sleeve and the falling away of the portion of the bulb remaining on the exterior. This characteristic is advantageous in that it can be implemented by the setting tool itself. It likewise makes feasible a method for rivet removal, another object of the invention, wherein the rivet is removed by exerting tension on the mandrel as a basis for rupture of the bulb between the head of the mandrel and the edge of the opening provided on the support surface of the bulb. The removal of the tack-riveting rivet thus does not require a special tool and is not designed such that the elements to be assembled could be damaged.
Problems solved by technology
The applicants have found that upon completion of the coupling and tightening operation, the blind rivets of the prior art have, within the context of tack riveting, the disadvantage of providing very little installed tension in the tightening they effect which could be especially disadvantageous for the permanent fastening phase of operation that customarily follows the temporary fastening phase of operation.
Another disadvantage likewise linked to the transition between the temporary fastening phase of operation and the permanent fastening phase of operation relates to the removal of the temporary fastening means.
As such, the applicants have found that such phases of operation require specific tools, in particular for the machining of the rivet fitted as a basis for destruction, such machining being likely to damage the elements to be assembled.
A further disadvantage of the fastening means of the prior art used for tack riveting is the lack of adaptability with regard to the thickness of the elements they are intended to assemble.
Indeed, the capacities of the fastening means of the prior art do not allow, through the use of one single dimensional model, assembly of the set of possible different thicknesses by tack riveting, which thus requires rivets of a plurality of dimensional models.
It is therefore not possible to create a true tightening load or an installed tension aided by the rivet disclosed in the document since the mandrel is not fixed to the sleeve upon completion of the deformation of said sleeve.
Method used
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Embodiment Construction
[0017]The applicants have undertaken research in view of proposing a blind rivet that is capable of being used within the context of a tack riveting method and in view of improving the tightening tension that said rivet creates between the two pieces of sheet metal it is designed to fasten together.
[0018]The research was conducted with the purpose of designing and manufacturing of a rivet adapted to the different thicknesses that the assemblies of coupled and tack riveted elements may have.
[0019]Furthermore, the removal phase of the operation has also been considered in the design of this rivet.
[0020]The blind rivet is of the type anticipated for the tack riveting of at least two elements between said rivet, and it is also positioned by a setting tool,[0021]the rivet being composed of a deformable hollow sleeve and a breakable mandrel positioned within said sleeve,[0022]the assembly being positioned and traversing two substantially coaxial openings and arranged in the elements to be...
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Abstract
The invention relates to a blind rivet (R) of the type which is used to position at least two elements (100 and 200) alongside one another and to fasten same and which is installed using an installation tool. The invention is characterised in that it comprises a bushing (300) which is made from one single piece and which is preformed from a single tapered part (330) that is located between the two support surfaces (311 and 321), with the elements to be assembled being defined initially or by means of deformation by the bushing. The invention also relates to a method of removing said rivet.
Description
FIELD OF THE INVENTION[0001]This invention relates to the field of blind rivet fastenings, specifically to adaptations permitting, under the best conditions, different phases of operations consisting of tack riveting two pieces of sheet between themselves.DESCRIPTION OF THE PRIOR ART[0002]The phase of operation of temporary fastening known as a tack riveting operation is an assembly phase that presents a plurality of functions:[0003]the positioning of the elements to be assembled[0004]the flow of sealing mastic, if mastic is used[0005]the coupling of the sheets of metal[0006]and keeping them in position.[0007]The applicants have found that upon completion of the coupling and tightening operation, the blind rivets of the prior art have, within the context of tack riveting, the disadvantage of providing very little installed tension in the tightening they effect which could be especially disadvantageous for the permanent fastening phase of operation that customarily follows the tempor...
Claims
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IPC IPC(8): F16B19/10F16B13/04
CPCY10T29/49956F16B19/1054
InventorAURIOL, PIERREAURIOL
OwnerATELIERS DE LA HAUTE GARONNE ETS AURIOL & CIE