Abstract: The catalytic converter has a casing with two one-piece shells. These each have a curved section and flanges projecting outward away therefrom. The flanges are welded to one another in pairs and make an angle with one another at least in a substantial part of their lengths and, for example, over their entire lengths. In the production of the catalytic converter, the shells can be produced simply and economically with the aid of a shaping process. After at least one dimensionally stable core and an elastically deformable intermediate layer surrounding this core have been arranged between the two shells, the latter are pressed against one another with a predetermined compressive force and are welded to one another. In the mass production of catalytic converter, their cores can be installed readily and without damage in the casing, even in the case of relatively large deviations from the intended ideal shapes and ideal dimensions.

Abstract: The present invention relates to a hydraulic jack with a base plate on which are attached a pump cylinder, a jack cylinder, and a reservoir concentrically surrounding the jack cylinder, the reservoir being connected to the pump cylinder by means of a first passage, passing through the base plate, and a first nonreturn valve which enables hydraulic medium to flow from the reservoir on pumping, the pump cylinder being connected to the jack cylinder by means of a second passage, passing through the base plate, and a second nonreturn valve which enables hydraulic medium to flow from the pump cylinder on pumping, and the jack cylinder being connected to the reservoir by means of a relief passage and a blocking member including an adjustable bolt.