B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 20/02 (2006.01) A47J 27/00 (2006.01) A47J 36/02 (2006.01) B21D 51/22 (2006.01) B23P 13/00 (2006.01)
Patent
CA 2074897
18651 ABSTRACT OF THE DISCLOSURE A method of manufacturing a cooking utensil comprising a round container for the food. The container comprises a container, a plate made of heat-conducting material and a cap enclosing the plate, the cap being made from a sheet-metal disk and having a base provided with a convex curvature towards the container and also having collar which bears against the round container in a curved transition region between the container base and the container jacket. The container and the cap are made of stainless steel. The plate is intermetallically bonded to the container base and the cap. The plate, the sheet-metal disk and the container base are centered and connected by a central spot weld, using electric resistance welding. Next, the intermetallic bond is produced by single or multiple impulse pressure and permanent deformation and the cap collar is formed on the sheet-metal disk and its rim is placed around the container. Use is made of a sheet-metal disk having an edge which, during the shaping of the cap collar, is permanently deformed and pressed against the container. The sheet-metal disk, the plate and the con- tainer base are centered by the resistance welding so as to be resistant to impulse pressure. The pulse pressure is exerted so as to produce the convex curvature in the cap bottom. During impulse pressure, the air is first expelled from the region between the sheet-metal disk and the cap collar in process of formation. During and after this process, a seal is produced in the form of permanent deformation with regard to the plastic deformation of the plate material.
Amc International Alfa Metalcraft Corporation Ag
Borden Ladner Gervais Llp
Galle Alfred
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