Abstract: A method for assembling a stator for an electric machine having a permanent magnet for generating a magnetic field in an air gap. Assembly of the stator is performed with the aid of a plunger, the cross section of which corresponds to the cross section of the air gap. The permanent magnet is slid into the interior of the plunger, whereas the flux return ring is slid over the same. The so formed sub-assembly is put into a casting mold adapted to be filled with a plastic material, which in its cured or hardened state forms a casing intimately surrounding the outer surface of the flux return ring and forming a face plate, to which the permanent magnet adheres. When the plastic material has set, the casting mold is opened and the plunger is retracted from the sub-assembly, resulting in a close toleranced cylindrical air gap space. After insertion of a bell-shaped rotor, a brush cover is assembled opposite the face plate.

Abstract: A method for assembling a stator for an electric machine having a permanent magnet for generating a magnetic field in an air gap. Assembly of the stator is performed with the aid of a plunger, the cross-section of which corresponds to the cross-section of the air gap. The permanent magnet is slid into the interior of the plunger, whereas the flux return ring is slid over the same. The so formed sub-assembly is put into a casting mold adapted to be filled with a plastics material, which in its cured or hardened state forms a casing intimately surrounding the outer surface of the flux return ring and forming a face plate, to which the permanent magnet adheres. When the plastics material has set, the casting mold is opened and the plunger is retracted from the sub-assembly, resulting in a close toleranced cylindrical air gap space. After insertion of a bell-shaped rotor, a brush cover is assembled opposite the face plate.

Abstract: A method of winding a tubular-shaped multilayer coil usable as an ironless rotor for electrical motors. A cylindrical form having a rhomboidal cross-section is used as a core for making a cylindrical winding having a number of taps intended to be connected to a commutator of a slip ring device. The cylindrical winding is stripped off from the cylindrical form and flattened to a bandlike structure without deforming the configuration of the windings. The bandlike structure is bent and the ends thereof are joined to form a tubular-shaped coil usable as an ironless rotor. The wire is wound on the cylindrical core in a multilayer formation by alternating the direction of axial advancement or displacement of the windings so as to form a cylindrical winding having a thickness of at least three times that of the diameter of the insulated wire.

Abstract: A filtering device for the preparation of coffee comprises a vessel with a permanent metallic filter disk forming the bottom thereof. Vertically extending walls divide the vessel into distinct compartments of varying volumetric content, thus separating distinct areas of the filter disk. A water inlet is provided for one of the compartments in which the coffee powder is placed so that the amount of water used at any one time determines the active area of the filter disk utilized by virtue of the overflow between compartments.

Abstract: A device for the preparation of filtered coffee is described. It has a permanent filter disk which can be reused, thus eliminating the need for frequent replacement.