Patents Assigned to Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
  • Patent number: 7172794
    Abstract: A method for obtaining a ferrous alloy part that supports a very high seizure load with very low dispersion includes steps of covering the part with an iron sulphide coating having an appropriate thickness and Fe/S ratio, where the coating is selected from among those with surfaces having a fractal dimension that is at least equal to 2.6.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: February 6, 2007
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecaniques et Frottement
    Inventors: Stéphane Chomer, Jean-Paul Terrat
  • Patent number: 6645315
    Abstract: In a surface treatment process for mechanical parts, for conferring on the parts a high resistance to wear and corrosion and a roughness propitious to lubrication, nitriding of the part is followed consecutively by oxidation of the part. The nitriding is applied by immersing the part in a molten salt nitriding bath free of sulfur-containing species at a temperature from approximately 500° C. to approximately 700° C. The oxidation is carried out in an oxidizing aqueous solution at a temperature less than approximately 200° C.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: November 11, 2003
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Stéphane Chomer, Stephan Teil
  • Patent number: 6562471
    Abstract: The metal alloy based on aluminium and titanium includes an aluminium content between 80 and 90 atomic percent and a titanium content between 10 and 20 atomic percent. The alloy is microcrystalline and outside thermodynamic equilibrium, the alloy is thereby resistant to oxidation and corrosion and has at the same time remarkable adhesion to polymer materials. The metal alloy can be in the form of a reflecting coating of a thickness ranging between 0.01 and 3 &mgr;m, covered with a protective film of a polymer material. A mirror having specular reflectivity not less than about 65%, good resistance to corrosion and oxidation includes a substrate of a polymer material supporting the reflecting coating.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: May 13, 2003
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Michel Martin, Frédéric Faverjon, Janick Moreau, Jean-Marc Poirson, Jean-Paul Terrat
  • Patent number: 5780781
    Abstract: Apparatus for weighing a person that is confined to a bed that includes a series of modular units for supporting a bed frame and sensors associated with each of the modular units that are capable of performing in combination a weighing function.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: July 14, 1998
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement S.A.
    Inventors: Antoine Berger, Serge Esteveny
  • Patent number: 5753052
    Abstract: In a method of increasing the wear resistance and the corrosion resistance f opposed bearing surfaces of parts subjected to reciprocal friction, in particular when the product of the pressure distributed over the bearing surfaces by the relative speed of the latter exceeds 0.4 MPa.m/s, thermochemical diffusion of nitrogen is effected by nitriding or nitrocarburizing in a molten salt bath at a temperature of 570.degree. C..+-.15.degree. C. followed by an oxidizing or phosphating surface chemical reaction providing resistance to wet corrosion. The nitriding or nitrocarburizing molten salt bath is made up of alkaline carbonates and cyanates and further contains sulfur-containing substances in the following percentages by weight:30%<CNO.sup.- <45%15%<CO.sub.3.sup.2- <25%15%<Na.sup.+ <25%20%<K.sup.+ <30%1%<Li.sup.+ <6%1 ppm<S.sup.2- <100 ppmThe time for which parts are immersed in the bath is between 15 minutes and 45 minutes.
    Type: Grant
    Filed: February 27, 1996
    Date of Patent: May 19, 1998
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Bernard Dajoux, Antoine Martin
  • Patent number: 5576066
    Abstract: A process for improving the wear and corrosion resistance of ferrous metal arts consists in immersing the parts, which have previously been treated using a nitriding, diffusion technique, in a molten salt bath comprising carbonates, nitrates, hydroxides and oxygenated alkali metal salts. The relative anionic proportions by weight of carbonates, nitrates and hydroxides expressed in terms of their sodium salts and corresponding to the active phase, that is the liquid in the bath, are as follows:11<CO.sub.3.sup.2- <2319<NO.sub.3.sup.- <376<OH.sup.- <19and the proportion by weight of oxygenated alkali metal salts, expressed in equivalents of Cr.sub.2 O.sub.7.sup.2- is as follows: 0.05<oxygenated anions<0.41. This process guarantees a high degree of reproducibility of results regardless of the type of treated part.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: November 19, 1996
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventor: Jean Polti
  • Patent number: 5549195
    Abstract: Articulated plates (L) are assembled in combination with at least two drive rums supported by a framework (6). The plates (L) present longitudinally, two by two, complementary guiding and articulation profiles (R) and (C) defined to create at least one continuous flat face. The plates are coupled to one another by flexible links (1).
    Type: Grant
    Filed: July 27, 1994
    Date of Patent: August 27, 1996
    Assignees: Entre-Prises, Centre Stephanois de Recherches Mecaniques Hydromecaniques et Frottement
    Inventors: Michel Aulagner, Serge Esteveny
  • Patent number: 5518605
    Abstract: In a nitriding method intended to confer upon ferrous metal parts, in addon to surface properties resulting directly from nitriding, corrosion resistance comparable to that obtained when the nitriding treatment is followed by an oxidizing treatment, in particular in a salt bath, the parts are treated by immersion for an appropriate time in a molten salt bath containing in the known manner essentially alkali metal carbonates and cyanates and a small quantity of a sulfur-containing substance. The parts are held at a positive potential relative to a counter-electrode in contact with the bath so that a high current flows through the bath from the parts to the counter-electrode and the concentration of cyanides formed by secondary reaction is kept below 6%. It is preferable to use a constant average current; the typical current densities are from 300 amperes to 800 amperes per m.sup.2, the typical temperature ranges are from 450.degree. C. to 650.degree. C.
    Type: Grant
    Filed: July 22, 1994
    Date of Patent: May 21, 1996
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Hocine Hadj-Rabah, Jean-Paul Terrat
  • Patent number: 5514226
    Abstract: A salt bath composition is adapted to form a layer of magnetite Fe.sub.3 O.sub.4 on the surface of ferrous metal parts, including nitrided ferrous metal parts, to protect the underlying iron against corrosion. This layer is impermeable and of good crystalline order, as indicated by a deep black color and a corrosion potential greater than 1 000 mV. The composition includes at least nitrate anions and sodium and lithium cations, the latter in a proportion by weight relative to the bath between 0.1% and 5%, preferably between 0.5% and 1.75%. Preferred compositions contain sodium, potassium and lithium cations and nitrate, carbonate and hydroxyl anions, within the following percentage ranges:8.5 .ltoreq.CO.sub.3.sup.2- .ltoreq.2615 .ltoreq.NO.sub.3.sup.- .ltoreq.41.54.7.ltoreq.OH.sup.- .ltoreq.21.
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: May 7, 1996
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Jean-Paul Terrat, Philippe Maurin-Perrier, Daniel Viviani
  • Patent number: 5468071
    Abstract: A bearing shell for heavily loaded bearings with a rolled strip interfere or force fit lining comprises a generally annular body with an axial bore fitted with a lining in which a shaft turns. The lining comprises a 2 mm thick rectangle of rolled steel strip at least the bearing surface of which has been surface hardened to a depth of approximately 0.5 mm by nitriding or by carburizing and quenching. The ends of the rolled strip bear on each other. The strip is an interference or force fit in the bore of the body and has an excess length relative to the developed length of a neutral fiber of an unstressed lining between 0.3 and 9%.
    Type: Grant
    Filed: July 7, 1993
    Date of Patent: November 21, 1995
    Assignee: Centre Stephanois De Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Daniel Tourneux, Rene Mariatte, Bernard Dajoux
  • Patent number: 5389161
    Abstract: After preliminary treatment of their surfaces, the parts are brought into contact within a solution containing, essentially, protons, phosphate anions and cations chosen from Ca.sup.2+, Sn.sup.2+ and Mn.sup.2+. The preliminary treatment results in the formation, on the surface, of a layer that comprises, per 1000 atoms, at least 150 atoms of free iron and from 5 to 150 atoms of sulphur, and has a porosity defined by an actual surface area to macroscopic surface area ratio of at least 20. According to an embodiment, these surface characteristics are obtained by nitriding in a bath of molten salts containing sulphur-containing species. According to a second embodiment, these surface characteristics are obtained by nitriding in a bath of molten salts followed by a conventional sulphiding operation. According to a third embodiment, these surface characteristics are obtained by depositing metal, followed by a conventional sulphiding operation.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: February 14, 1995
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Joseph Wawra, Jean-Marc Poirson
  • Patent number: 5346560
    Abstract: Precision ferrous metal parts subject to severe friction and corrosion in e are nitrided, preferably in a bath of molten salts based on CNO.sup.- cyanate ions, oxidized, preferably in baths of molten oxidizing alkaline salts, and then impregnated with a hydrophobic wax. A layer after the nitriding and oxidation steps is formed of a close-packed deep sub-layer and a porous superficial sub-layer ranging in thickness between 5 and 25 .mu.m, and exhibiting through pores ranging between 0.2 and 3 .mu.m in diameter. The impregnation wax is an organic compound with a high molecular weight between 500 and 10,000, with a surface tension in the liquid state ranging between 10 and 73 mN/m, the contact angle between the solid phase of the superficial layer and the wax in the liquid state ranging between 0 and 75.degree. C.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: September 13, 1994
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Sylvie Mournet, Joseph Wawra
  • Patent number: 5160537
    Abstract: Coating for conferring good friction properties upon a substrate and comprising a non-equilibrium alloy of chromium and nitrogen. The alloy comprises, per one hundred atoms, from 87 to 68 atoms of chromium and from 13 to 32 atoms of nitrogen and two phases, a cubic microcrystalline chromium phase containing included nitrogen and a quadratic chromium nitride phase with a stoichiometric deficient nitrogen content relative to the Cr.sub.2 N nitride. The ratio of the quadratic nitride lattice parameters is between 1.02 and 1.5. This quadratic nitride was previously unknown and probably can exist only in association with chromium. It resists wear up to five times better than known single-phase chromium-nitrogen alloys and is free of the inherent fragility of two-phase alloys containing hexagonal Cr.sub.2 N nitride. The coatings are obtained by magnetron cathode sputtering of chromium with a nitrogen partial presure in a rare gas atmosphere between a maximum and a minimum determined experimentally.
    Type: Grant
    Filed: October 16, 1990
    Date of Patent: November 3, 1992
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Jean-Paul Terrat, Pascal Fort
  • Patent number: 4958982
    Abstract: The device is outstanding in that the gripping structures (1) are indepent while each being servo-controlled by a system of components (10)-(9) fitted to a drive structure being likely to carry out the relative movement of gripping structures (1) with respect to one another in order to vary their pitch in a continuous manner so that their spacing is in register with that of the notches where the items should be transferred, the assembly of gripping structures being mounted on a support plate which can be moved in translation and height.
    Type: Grant
    Filed: February 24, 1989
    Date of Patent: September 25, 1990
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Gerard Champet, Gilles Charpille
  • Patent number: 4806139
    Abstract: In the production of moulded glass articles, difficulty arises from the risks of adhesion of the glass to the surfaces of the mould, which is made unserviceable, at least for a time. A permanent anti-adherent coating for glassmaking moulds is provided on the mould cavity surfaces, by a metal layer comprising a molybdenum alloy containing 30 to 55% Mo and less than 4% iron. The metal layer may also contain nickel and chromium in significant quantities.
    Type: Grant
    Filed: December 23, 1987
    Date of Patent: February 21, 1989
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Michel Cartier, Jean-Paul Farjaudon
  • Patent number: 4671867
    Abstract: The subject matter of the invention mainly relates to the technical areas of foundry, manufacture of parts by casting metal in moulds.The process consists in that after moulding the parts and stripping them from the moulds which were broken, during a first cycle the mixture resulting from the knock-out is recovered. This mixture being stored. This mixture is directed from the storage place to an intermediate container; then the mixture from the intermediate container is fed up to a sieve grading separator unit allowing to separate the grains or particles in several different grading batches; each one of these batches is directed to a separating table designed for separating chromite from silica; the chromite on the one hand and the silica on the other hand are recovered in containers.This invention mainly applies to the recovery of components of different densities, especially chromite and silica.
    Type: Grant
    Filed: March 21, 1985
    Date of Patent: June 9, 1987
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Gabriel Battie, Yves Bonnel
  • Patent number: 4608092
    Abstract: A process for improving the corrosion resistance of ferrous metal parts also subject to heat and chemical treatment following nitriding in association or not with carburizing and/or sulfurizing essentially comprises immersing the parts in a known bath of molten salts to which is added a sufficient quantity of a halogenophosphate having formula:M.sub.2 (PO.sub.3 X).sub.min which X and is fluorine and M is a metal of subgroup Ia, IIa or IIb of the periodic table of elements, having the valency m. The preferred halogenophosphate is sodium, potassium, calcium or zinc monofluorophosphate. The molten salt bath may be of the oxidizing type, comprising for example, 65% by weight KOH, 25% NaNO.sub.3, 10% Na.sub.2 CO.sub.3, or of the neutral type, for example a eutectic mixture of 50% BaCl.sub.2, 30% CaCl.sub.2, 20% NaCl. The halogenophosphate may be added in proportions of 0.1 to 20 g per kilogram of salt bath.
    Type: Grant
    Filed: March 19, 1985
    Date of Patent: August 26, 1986
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Yves Tremoureux, Jean-Luc Reynaud
  • Patent number: 4494478
    Abstract: A seal permitting wire, rod or the like to fed into a chamber at low prese comprising a Venturi tube constituting in its interior and in succession a convergence a neck and a divergence. The tube has a coaxial sleeve on its convergence side into which the solid to be treated can be introduced. This sleeve is partially engaged inside the Venturi tube over a length determined so as to create a rapid change of section which defines a dynamic joint zone in combination with the pressure, flow and speed of the fluid injected toward the inside of the Venturi tube.
    Type: Grant
    Filed: February 10, 1983
    Date of Patent: January 22, 1985
    Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Gilles Lacour, Serge Esteveny
  • Patent number: 4487559
    Abstract: A hydraulic motor of variable cubic capacity with retractable partitions sed in radial grooves in a rotor. The partitions are each integral with a guide pin trapped in an endless cam groove of approximately ovoid shape in a surface stator. The partitions also pass through radial grooves in a sleeve housed in a circular groove in the rotor in order to slide therein parallel to the axis of the motor. A reaction member passes through an aperture in the stator in order to remain in frictional contact with an end surface of the sleeve. The driving force comes from oil pressure in a circular groove defined between the end surface of the sleeve and the surface of the stator. The sleeve and reaction member slide jointly.
    Type: Grant
    Filed: September 2, 1983
    Date of Patent: December 11, 1984
    Assignee: Centre Stephanois De Recherches Mecaniques Hydromecanique et Frottement
    Inventors: Antoine Berger, Francois Gibert
  • Patent number: 4478731
    Abstract: A process for the production of an aqueous lubricant composition free of oil including water and at least one metallic carboxylate, wherein the anionic is at least one saturated linear organic radical containing at least 12 carbon atoms and the cationic is at least one bivalent or trivalent metal having an electro-chemical oxidation-reduction potential greater than -0.7 volts. The process includes mixing of two mother solutions. The first mother solution is an aqueous solution of at least one alkali metal carboxylate soluble in water wherein the anionic is at least one saturated linear organic radical with at least 12 carbon atoms. The second mother solution is an aqueous solution of at least one metallic salt whereof the anionic is selected from the group consisting of hydroxide, chloride, sulphate, nitrate or phosphate ions and whereof the cationic is at least one bivalent or trivalent metal having an electro-chemical oxidation reduction potential greater than -0.70 volts.
    Type: Grant
    Filed: July 21, 1983
    Date of Patent: October 23, 1984
    Assignee: Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Zone Industrielle
    Inventor: Antoine Gaucher