Abstract: A controlled coupling action between a distributor element and a rotary diaphragm is to be provided in an environment exposed to dust and powder within a dosing apparatus into which all kinds of materials, such as abrasive and chemically aggressive substances, but also materials intensifying sliding or adhesion properties are introduced for dosed delivery. To that end there are provided elastic form-locking coupling elements which, under increasing load, momentarily disengage the rotary connection between the distributor element and the rotary diaphragm. A preferred material pairing for the elastic form-locking coupling elements is metal, such as stainless steel, and polytetrafluoroethylene known as Teflon.

Abstract: In a magnet stirring apparatus comprising a base which includes a plurality of magnet coils and onto which respective vessels can be placed, said vessels being made of a non-magnetic material and each containing a magnetic stirring bar as well as the liquid to be stirred, the stability of the stirring operation within a wide range of lengths of stirring bars and of adjusted rotational speeds is achieved by pole shoes which are long straggling in the radial direction toward one center.