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Blind rivet and removal method thereof

Blind rivet and removal method thereof description/claims

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.

The phase of operation of temporary fastening known as a tack riveting operation is an assembly phase that presents a plurality of functions: the positioning of the elements to be assembled the flow of sealing mastic, if mastic is used the coupling of the sheets of metal and keeping them in position.

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. In fact, the removal phase of operation should be realisable in a short period of time and as simply as possible. 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.

EP 0 677 666 discloses a blind rivet of the type intended for the coupling and the tack riveting together of at least two elements, said rivet being positioned by a setting tool,

the rivet being an assembly comprising a deformable hollow sleeve and a breakable mandrel positioned within said sleeve,

the assembly being positioned and traversing two substantially coaxial openings and arranged in the elements to be assembled,

the sleeve comprising a body having two ends,

a first end comprising a preformed head for defining a first support surface on the external surface of a first element, and a second end which, under the action of a tension deformation on the mandrel, forms a bulb that defines a second support surface on the external surface of said second element,

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