Abstract: An evaporator for refrigerators and the like, comprising a sheet and at least one refrigerant flow passage assembly which includes a multi-passage unit having a plurality of parallel flow passages, an inlet header pipe connected to the inlet openings of the flow passages and an outlet header pipe connected to the outlet openings of the flow passages. The sheet which carries on one surface thereof the passage assembly or assemblies is bent to form a rectangular box-like structure of a cooler for a freezing chamber formed in the refrigerators.

Abstract: Small-sized pressure vessels made of sheet metal which are suitable for the storage and carriage of pressurized liquid, pressurized gas and the like are provided herein, and also the method of manufacturing these pressure vessels which comprises in combination a process in which two cup-shaped pieces made of sheet metal are fitted, or a jointing ring made of metal or synthetic resin is fitted to the open end of one of both cup-shaped pieces along its inner or outer circumferential surface, and hot-melting type adhesives are applied to the jointing surface of each cup-shaped piece to which the jointing ring is attached and the jointing ring itself or the open end of the other cup-shaped piece. Also both cup-shaped pieces may be butted or fitted in their open ends in which, for example, one cup-shaped piece which has the jointing ring fitted thereto and the other cup-shaped piece are heated to 120.degree. C.-250.degree. C. to melt the adhesives and are then cooled to solidify the adhesives.