Abstract: A coil for an electric motor, which is to be inserted into a pole shoe and is wound, before the insertion, in a template, includes two cases of insulating material, which are positioned in mirror-inverted relationship with one another. Pockets are provided laterally of the cases to receive contact terminals therein. The pockets form limiting surfaces for limiting the insertion of the coil into a pole shoe. Each case is closed, after the coil winding has been completed, by connecting two upper portions thereof to each other by welding or glueing.

Abstract: In a hand-held machine tool, a housing formed of two shells accommodates an electric motor, a motor bearing assembly and electric structural components. A brush-side motor bearing includes a bearing support which carries thereon the electric structural components, such as carbon brush holders, chokes for spark quenching, an inductive receiver and light-emitting diodes. The bearing support can be preassembled with these structural components outside the housing and inserted into one of the housing shells.

Abstract: Fixture for a wire for use in a winding process in a manufacturing of electric machines. The fixture includes a groove-shaped wire-receiving element and is provided with a funnel-like slot extending at an angle to the axis of elongation of the wire-receiving element. The wire end inserted into the wire-receiving element is then guided through the insertion slot.

Abstract: A brush holder mechanism for electric motors, especially the fractional horsepower commutator-equipped motors of workshop power tools. In order to prevent failure of the tool due to jamming of the carbon brushes in their holders, the brush holder according to the invention provides that the brush holder casing in which the carbon brush moves has smooth, flat and uninterrupted interior surfaces and the casing is constructed of a single piece of metal or a single piece of metal on which a continuous cover plate is attached. The integral construction of the casing insures that the casing is not deformed during manufacture or assembly, in particular by the bending of parts of the casing into fastening tabs and the like. In the brush holder according to the invention, the fastening means are integral with the cover plate or the casing. In other embodiments, the casing is held in a receiver by clamps and screws.

Abstract: A tool chuck, especially for holding tool bits, for example twist drills, and for use with a machine tool, in particular a portable electric drill. The chuck is so constructed as to permit secure holding of the tool bit even when used in percussion drills or impact hammer drills, while at the same time providing protection for the elastic internal element which provides axial movement. The tool chuck has a core or mandrel surrounded by a hollow conical collar which includes at least two chuck jaws and the elastic member is located between the core and the collar to apply an axial force between these two parts when the chuck is closed on a tool bit while being protected against direct exposure to the impacts sustained by the chuck jaws.

Abstract: An electric contact arrangement for wire coils of stators of electric machines, particularly stator coils of electric motors, includes an annular support member of electrically insulating material stationarily abutting one end of the stator, pin-shaped projections on the support member extending away from the stator, and metallic contact caps pressed onto the pin-shaped projections so as to clamp portions of wires respectively located intermediate the pin-shaped projections and the contact caps. Contact members arranged in the electric circuit for supplying electric current to the coils are in an electric contact with the contact caps upon assembly of the electric machine. Recesses may be provided in the support member and particularly in the pin-shaped projections in which the wires are received, and the caps may be internally corrugated to clamp the wire between the respective corrugations and the respective recess of the pin-shaped projection.