Double seal annular joint - has elastomeric outer ring and coil spring inner ring engaged by two=part sheath to define leakage detection chamber

The flexible annular joint includes a spirally wound metal ring constituting a spring, the latter being housed in a metal sheath. The sheat has two parallel flange, these being expanded to partially surround a plain plastics outer ring. The rings are coaxial and define a small vol. space which seals the joint. The sheath may include discontinuities in the region of the flanges, the spring ring being optionally dissociated with a metal hoop or an outer stop to limit the amount of deformation by the sheath. The joint may be used as a pipe joint, the chamber between the two rings acting as a buffer to check the seal integrity. PERFECTIONNEMENT AUX JOINTS ANNULAIRES FLEXIBLES, COMPORTANT UN RESSORT INTERNE A SPIRES JOINTIVES FERME SUR LUI-MEME ET, ENTOURANT CE RESSORT, AU MOINS UNE ENVELOPPE METALLIQUE DANS LAQUELLE EST ENCASTRE LE RESSORT.SELON L'INVENTION, L'ENVELOPPE ENTOURANT LE RESSORT INTERNE SE PROLONGE PAR DEUX FACES PLANES PARALLELES, S'ETENDANT DANS UN PLAN EQUATORIAL TRANSVERSAL DE SYMETRIE DU JOINT, LESDITES FACES PRESENTANT DES EPANOUISSEMENTS S'ECARTANT DUDIT PLAN A DISTANCE DETERMINEE DUDIT RESSORT POUR ENTOURER PARTIELLEMENT UN ANNEAU PLEIN EN ELASTOMERE, COAXIAL AUDIT RESSORT.LE PERFECTIONNEMENT CONSIDERE PERMET UN MEILLEUR ISOLEMENT DU JOINT ET UN CONTROLE DE L'ETANCHEITE.