Abstract:
Lien élastique destiné à permettre la régulation de la distance comprise entre deux éléments dont l'un au moins est mobile, caractérisé en ce qu'il comprend au moins deux brins élastiques (1, 2) fixés, chacun par l'intermédiaire de ses extrémités opposées, en deux points (6-7; 6-8; 6-9; 6-10) distants l'un de l'autre, d'une portion intermédiaire (5a) d'une sangle (5) comprise entre les portions extrêmes (5b, 5c) de cette dernière, dans des conditions telles que lorsqu'on exerce une force de traction sur ladite sangle, un premier brin élastique (1) se trouve d'abord étiré, le deuxième brin élastique (2) se trouvant ensuite étiré, en fonction de l'importance de la force de traction appliquée.
Abstract:
A coated metal reinforcement element for polymeric or elastomeric materials comprises a coating of: a polymer or prepolymer compatible with and co-polymerizable, co-vulcanizable or cross-linkable with said polymeric or elastomeric material to be reinforced, and bearing functional groups; either covalently bonding to the metal surface of said reinforcement element; or forming covalent bonds with the outward directed first functional groups of a mono- or multimolecular layer of a bifunctional adhesion promotor intercalated between said metal and said coating and bound to said metal by its second functional groups. A method for the coating includes a one step and a two step procedure.
Abstract:
In a composite of a vulcanizable rubber or rubber-like composition with one or more metal reinforcement elements embedded therein, the metal reinforcement element is coated with a polymer or non-cured rubber composition compatible with and co-polymerizable, co-vulcanizable or crosslinkable with said vulcanizable rubber composition to be reinforced, and additionally bearing functional groups either covalently bonding to the metal surface of said reinforcement element or forming covalent bonds with the outward directed first functional groups of a mono- or multimolecular layer of a bifunctional adhesion promotor intercalated between said metal and said coating and bound to said metal by its second functional groups. A cured rubber or rubber-like product, for instance a pneumatic tire, is obtained by vulcanization of such a composite.
Abstract:
A steel cord (114) for the reinforcement of rubber products comprises strength elements (100, 132) and has length, a longitudinal central axis (112) and a cord pitch. Each of the elements (100) has a projection on a plane YZ perpendicular to the longitudinal central axis (112). At least one of these projections takes the form of a curve with a radius of curvature which alternates between a maximum and minimum. The curve further has a center of curvature. The radius of curvature and the center of curvature lie inside the curve so that a convex curve is obtained. The cord (114) is further characterized by one or both of the following features: (i) the distance between two minimum radii of curvature of said curve measured along the longitudinal central axis (112) is different from half the cord pitch; or (ii) if all of said elements (100) provide a convex curve, at least one of said convex curves substantially differs from another convex curve. The steel cord (114) allows full rubber penetration despite low values of cord diameter and part load elongation (PLE).