Abstract: The invention proposes a method for the integral molding of a flange (5) onto the end of a round or oval pipe (11) of thin-walled sheet metal. This method takes place in two stages. In a first stage, for the purpose of accumulating material, a sectionally circular or spiral-shaped bead (17) is molded on by means of a pre-forming roller tool (9), comprising a combination of rollers (13 to 15) (Figure a). In a second stage, the molded-on bead is compacted with the aid of a final-forming roller tool (18), comprising the rollers (19) and (20), to produce an at least partly solid flange (5) (Figure b).

Abstract: An open clamping ring (11) is provided for connecting tubes (1) that are provided with terminal flanges (2). The clamping ring is drawn together with the aid of a clamping lock that is provided at the open ends of the clamping ring. The clamping (10) substantially has the shape of a U whose legs that are composed of an inner leg section (12) and an outer leg section (14) are bent such that a clamping edge (13) is formed in the central area between the leg sections (12 and 14). The inventive clamping ring (10) thus approximately has the shape of an X. The clamping edges (13) rest more or less linearly on the outside of the final flange sections (2a) such that the friction between the clamping ring (10) and the terminal flanges (2) is reduced when the clamping ring is assembled while force is transmitted and distributed in an optimal manner.

Abstract: The invention relates to an open clamping ring (11), by means of which tubes (1) that are provided with terminal flanges (2) are connected. Said clamping ring is drawn together with the aid of a clamping lock that is provided at the open ends of the clamping ring. The clamping (10) substantially has the shape of a U whose legs that are composed of an inner leg section (12) and an outer leg section (14) are bent such that a clamping edge (13) is formed in the central area between the leg sections (12 and 14). The inventive clamping ring (10) thus approximately has the shape of an X. The clamping edges (13) rest more or less linearly on the outside of the final flange sections (2a) such that the friction between the clamping ring (10) and the terminal flanges (2) is reduced when the clamping ring is assembled while force is transmitted and distributed in an optimal manner.

Abstract: The invention relates to an open locking ring (14) comprising a screw lock which is used to connect pipes comprising end flanges or to fix covers to containers or the like. Said screw lock comprises a clamping screw which extends in the peripheral direction and is embodied as a double spindle (1), the ends of said clamping screw being provided with counter rotating threads (2, 3). Said threads (2, 3) engage in threaded plates (6, 10) with a right-handed inner thread (7) or a left-handed inner thread (11), the threaded plates (6, 10) being pivotably mounted in bearing blocks (15) connected to the ends of the clamping ring (14). The ends (13) of the clamping ring (14) are pulled together or pushed away from each other by actuating the double spindle (1). To this end, the double spindle (1) is provided with a central part (4) embodied as a hexagon such that a simple fork spanner (23) can be used to open or close the screw lock.