B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
Landscapes
Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others
(AREA)
Procede et appareil pour fabriquer un element decoratif sur le revetement d'un coussin de siege et element decoratif tel que passepoil ou bouton ainsi forme