B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
B21C37/15—Making tubes of special shape; Making tube fittings
B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
Machine à fabriquer des articles à recourbement annulaire, tels que des goupilles fendues, des rondelles faisant ressort (dites Grover), des cosses, des colliers de tuyauterie etc.
Procédé pour la fabrication d'un ajutage à doubles lèvres dans une pièce métallique et pièce munie de l'ajutage à doubles lèvres obtenue au moyen de ce procédé
Procede et appareil de fabrication de pieces de branchement sans soudure soumises a de grands efforts et pieces de branchement realisees par ledit procede