Abstract: Two chain segments of a snow-chain are connected through elongated elements, where both ends of an element each exhibit an open slot in which a link of a chain segment is introduced. Thereafter, the slots are pressed shut until the chain links are at least formlocked, or even forcelocked therein. The method enables one to make the connection elements out of the same material as the one used for the chain segments, and to temper them together with the latter. Futhermore, the method can easily be performed by robots.

Abstract: The disclosure relates to a rotary pump especially for corrosive liquids including an impeller rotating in a working chamber. A spirally wound duct leads from one surface of the working chamber to the outlet pipe of the pump. The upstream end of the duct obliquely enters the working chamber, whereby the end portion of the duct is laterally open towards the chamber and forms a channel in the wall of the chamber. The duct winds helically around the rotation axis of the impeller, having an inside wall at a progressively decreasing radial distance from said rotation axis and a progressively increasing pitch when viewed in the direction of the flow. A feature is the provision of the wound duct in the form of a helix as an open groove formed on the outer surface of a solid stator body and closed by an encompassing casing.