Abstract: An electric motor comprising a commutator and lever brushes which resiliently press thereagainst and are pivotable about a pivot axis, a connection line which extends in a direction perpendicular to the pivot axis between the center point of a brush contacting surface and the pivot axis being tangential to the outer surface of the commutator. Such a brush assembly is to be made smaller in size. Each lever brush comprises a bearing bush rotatably arranged to be coaxial to the pivot axis, as well as a shaped body which is made from a conductive material and is firmly connected to the bearing bush. The shaped body forms the brush contacting surface and has a connection point which is in direct electrical contact with the brush contacting surface for electrically connecting the lever brush. The bearing bush is made from a material which is more stable than the shaped body.

Abstract: A small electric motor comprising a stator, a rotor with a rotor shaft, and a projecting shaft end of the rotor shaft which has arranged thereon an element to be driven, so as to be of a vibration-low construction. The other shaft end of the rotor shaft is also designed as a projecting shaft end and a balancer is arranged on said other shaft end with an arrangement and mass or weight distribution that are predetermined for the dynamic balancing of the element to be driven.

Abstract: A direct current electromotor, having in particular small dimensions, comprising a collector plate arranged on a shaft, a plurality of collector wires held by the collector plate plate and accumulated to a collector sleeve, and comprising a capacitor disk also arranged in the area of the collector plate, the contact pads of the capacitor disk are each in electrical connection to at least one associated collector wire in a respective coordination. A direct current motor of this kind shall have a more simple structure so that very small diameters can also be produced. This is achieved in that the capacitor disk with its contact pads is directly set onto the collector wires and is connected therewith.

Abstract: The present invention refers to an electric motor comprising a stator with an internal permanent magnet and a tubular magnetic return sleeve surrounding said permanent magnet whereby an annular air gap is formed therebetween, said magnetic return sleeve being held at its axial and radial positions relative to said permanent magnet by a frame of plastic material injected around these two components and being connected to said permanent magnet by said plastic frame. The present invention aims at improving the manner in which the two structural components are attached to and positioned on one another.

Abstract: The present invention refers to an electric motor comprising a stator with an internal permanent magnet and a tubular magnetic return sleeve surrounding said permanent magnet whereby an annular air gap is formed therebetween, said magnetic return sleeve being held at its axial and radial positions relative to said permanent magnet by a frame of plastic material injected around these two components and being connected to said permanent magnet by said plastic frame. The present invention aims at improving the manner in which the two structural components are attached to and positioned on one another.

Abstract: The present invention refers to a dc motor, in particular a micro dc motor, comprising a shaft and a collector element arranged on said shaft and consisting of a collector plate and a collector which projects from said collector plate beyond the shaft end, the collector element being extended beyond the collector so as to form a shaft section on the side facing away from the collector plate, said shaft section being adapted to have attached thereto an additional component part. In accordance with a preferred embodiment, the dc motor is provided with an incremental angle-position encoder comprising an encoder element, the encoder element being fixedly attached to the collector element, which is extended so as to form a shaft section, and constituting the additional component part.

Abstract: The present invention refers to an electric motor including a tubular housing member and at least one cover secured thereto, said cover having an insertion area, which is inserted in the housing member in an essentially tight-fitting manner and which is connected to said housing member by means of at least one deformed portion of an end face area of said housing member. This kind of connection between the cover and the housing member is to be improved. This improvement is achieved by the features that the cover abuts on an end face of the housing member via a flange and that it has at least one opening in the transition region of the insertion area and the flange, said opening being accessible from outside via an access opening and forming an undercut portion at the insertion area, a respective portion of the end face area of the housing member being deformed into engagement with said undercut portion by moving the ram into said access opening, whereby the cover is locked in position on said housing member.

Abstract: A shaft bearing assembly, particularly for a miniature electric motor. In the case of the present shaft bearing assembly, an oil-impregnated dampening disc made of an absorbent material the capillary action of which is greater than that of the porous bearing block is disposed between the thrust collar of the shaft and the axial end face of the bearing block. The shaft bearing assembly is particularly suitable for electric motors of smaller size and is effective in reducing motor noise.

Abstract: A fastening device by which a thermoplastic cover may be fixed to a tubular component. The cover fits tightly into the tubular component which is provided in the region of the cover with bores through which a lost pin is pressed after heating into the constituent material of the cover. The pin has a smaller diameter than the bore so that material displaced by the hot pin is able to flow into the bore.

Abstract: An electrical machine having an armature that is rotatable in a stator. The armature has a winding that is energized via a commutator or via slip rings cooperating with brushes. A holding plate is provided on which the brushes are held and which is supported freely shiftable in the direction of the axis of rotation of the machine, but circumferentially immovable. The holding plate butts against a part that is supported axially immovable on the shaft of the armature, preferably a bearing. Spring means acting between the holding plate and an adjacent side plate of the stator or housing serves to bias the holding plate in an axial direction. The part against which the holding plate butts, lies preferably in or near the plane of the holding plate.

Abstract: A stator having a plurality of permanent magnets with a cylindrically shaped outer surface and with at least one planar opposite surface is manufactured to close tolerances of the air gap with the aid of a plurality of ferromagnetic link members, equal in number to the number of permanent magnets and adapted to come into planar contact with those surfaces of said permanent magnets which are pointing away from the air gap. The permanent magnets are placed into a cylindrically shaped sleeve, the inner diameter of which corresponds to the desired inner diameter of the air gap of the stator. A sleeve of a ferromagnetic material may be used for holding said permanent magnets in intimate contact with the sleeve. The link members are shaped so as to be brought into generally planar contact with at least part of the inner surface of two adjacent ones of the permanent magnets. An adhesive is used to secure the link members to the permanent magnets.

Abstract: A stator for an electrical machine, comprising an outer ferromagnetic flux return ring, a permanent magnet system arranged inside the flux return ring, and a face plate supporting the flux return ring and the permanent magnet system. The latter comprises at least four permanent magnets, each of which is shaped cylindrically at its outer surface, and an equal number of magnetically conductive link means, each of which abutts the inner surface of two adjacent permanent magnets. The link means serve to support the permanent magnets and may be bonded to the same. The stator is easy to manufacture with a low toleranced air gap and is of a rigid construction.

Abstract: A shaped sieve body that is made of a perforated metal foil, which is formed to a shaped body. Said body comprises at least one foil element provided along its connecting edges with anchoring means that are embedded in plastics. The foil element has a form allowing to spread said foil element in a plane.

Abstract: A reusable coffee filter with a pot-shaped hotwater container and a filter strainer adjacent an opening in the bottom of said container. The filter strainer is made of metallic sieve sheets having perforations flaring out in the flow direction. On top of the hotwater container a distribution plate is supportably held which has a plurality of holes distributed over an area corresponding to the vertical projection of the opening of the filter strainer in order to ensure a good wetting and extraction efficiency of the coffee powder.