Abstract: A multi-brush cage assembly for a subfractional horsepower electric motor has two brushes 22, 23 received in separate chambers 24, 25 of the cage and urged by springs 26, 27 towards a commutator 15 of the motor. An L-shaped changeover lever 30 is located on a pivot 33 between the chambers and keeps one brush 23 retracted until the other brush 22 has worn out.

Abstract: A brush assembly is constructed such that a brush and a brush terminal are linked by means of a pigtail, a brush spring is disposed under compression between the brush and the brush terminal, and a cylindrical guide is disposed near the brush terminal inside the brush spring.

Abstract: A brush device has a brush that slides against an outer circumferential surface of a cylindrical rotor. The brush device includes a base member, a terminal retained by the base member, an electric wire, which connects the brush to the terminal, and a cylindrical brush holder. The brush holder is located on the base member. The brush holder has a holder axis, which extends along the radial direction of the rotor. The brush is accommodated in and retained by the brush holder and is movable along the holder axis. The brush holder has an opening portion, which is formed at the outer portion of the brush holder with respect to the radial direction of the rotor. The opening portion permits the brush to pass along a direction perpendicular to the holder axis.

Abstract: A motor with brush includes a rotor having a rotary shaft and a commutator retained at the rotary shaft, two brush sections each having a plane surface in an axial direction of the rotor and in sliding contact with the commutator, and two brush terminals that are integral with the brush sections, respectively. Each of the brush terminals includes a brush connecting section formed in the axial direction of the rotary shaft and having a plane surface that connects to the plane surface of each of the corresponding brush sections, and a bent section that is bent in a direction generally orthogonal to the axial direction of the rotary shaft. The bent section restricts and fixedly positions the brush terminal and the brush section, and the brush terminals connect to external connection members that are provided outside the motor and inside an outer circumference of the motor.

Abstract: A brush holder including a tubular brush box, a baseplate configured to be fastened to an electrical brush and movable in the brush box, a resilient multi-contact lining disposed in the brush box between the baseplate and an inner wall of the brush box, and a spring applying a force to the baseplate in a predetermined direction.

Abstract: The brush device of a starter with an overheat protection device of the present invention is provided with brush holders, brushes slidably supported in the brush holders, respectively, springs contacting one sides of the brushes to press the brushes in the radial, inner directions, and thermostats disposed on the brushes and adapted to interrupt energization of a starting motor with a power when the brushes exceed a predetermined temperature, caused by the starting motor continuously energized with the power supply.

Abstract: A manually operative power supply device for an electronic unit is shown. The device has a crystal block having a high piezoelectric characteristic having a broad top surface. A hammer weight is spring mounted and is operative to strike the top surface of the crystal block so as to produce a generated voltage between the top surface and bottom surface of the crystal block. A capacitor is charged by the generated voltage until it is fully charged. The voltage of the fully charged capacitor provides the required electrical power to operate the electronic unit.

Abstract: Disclosed is a brush assembly of an alternator for a vehicle including a brush holder including a hollow brush holder body, and wired brushes each received in the brush holder, and adapted to be urged against a slip ring fitted around a rotor shaft by a spring along an axis of the slip ring, thereby coming into elastic contact with the slip ring to obtain an electrical connection to an external electrical device, each of the wired brushes consisting of a brush, and a lead wire electrically connected to the brush. The brush holder body of the brush holder has brush channels each adapted to receive the brush of an associated one of the wired brushes, and wire channels each arranged at one side of an associated one of the brush channels while extending longitudinally in parallel to the associated brush channel and communicating with the associated brush channel.

Abstract: A brush motor for an electric power steering system comprises a four-pole field portion 3, an armature 4 having windings 9 wound around a core 5 with 22 slots 8 to constitute a lap winding, hooks 12 which are formed on one ends of 22 commutator segments 10 respectively and on which the windings 9 are hooked, and a cylindrical commutator 7 constructed by molding integrally the commutator segments 10 with a resin, and four brushes 18 which contact slidably to outer peripheral surfaces of the commutator segments 10, wherein, when the commutator 7 to which a sliding contact portion of the brush 18 contacts is sectioned perpendicularly to an axial direction, a relationship of 0.18≦(A×N)/(D×D)≦0.23 is satisfied, where A is a sectional area of one commutator segment, N is a number of the commutator segments, and D is a diameter of outer peripheral surfaces of the commutator segments.

Abstract: A brush holding apparatus for at least one carbon brush includes a support plate with at least one brush guide, a spring element constructed and arranged for urging a carbon brush having a longitudinal axis mounted in the brush guide in a direction towards a commutator or slip ring, and a retaining element constructed and arranged for retracting the carbon brush against a force exerted by the spring element or for releasing the brush. The retaining element is slidably supported by the base plate in a direction perpendicular to the longitudinal axis of a carbon brush mounted in the brush guide.

Abstract: Pseudoelastic elements are shaped in order to form springs which exhibit relatively constant force levels over a major fraction of maximum deflection capacity during loading and also during unloading. The shape of sail pseudoelastic elements is chosen to concentrate at least one of flexural and torsional deformations within limited regions. The element may be braced outside said regions in order to further concentrate deformations within said regions. Loading of said pseudoelastic springs thus produces strains within said regions which are largely corresponding to the upper pseudoelastic stress plateau where strain variations cause relatively small changes in stress. Unloading of said pseudoelastic springs also produces strains within said regions which are largely corresponding to the lower stress plateau of the pseudoelastic stress-strain curve where stress is subject to relatively small changes with strain variations.

Abstract: A serpentine-shaped spring device having an internal core made of braided wires coated with elastomeric material for environmental protection and to enhance exertion of a low holding spring pressure on a metal fiber brush, when the spring device is suitably anchored at a stationary location to hold the brush in contact with a rotor during rotation thereof while conductively transferring electrical current thereto from the core of the spring device.

Abstract: Miniaturizing a motor part of a fuel pump by miniaturizing an armature cover can be achieved. A brush assembling structure for fuel pump in which a brush is assembled into a brush holder of an armature cover so as to press one end surface of the brush to abut on a commutator by the other end surface of the brush, the brush assembling structure comprises: a power-supply shunt wire provided on one end portion of the brush; at least one shunt wire drawing groove formed on the one end portion of the brush and arranged in the circumferential direction with respect to a bearing hole of the armature cover; and a guide groove provided in the brush holder as corresponding to the shunt wire drawing groove, wherein a drawing direction of the shunt wire extending from the one end surface of the brush and being guided by both the shunt wire drawing groove and the guide groove is the circumferential direction.

Abstract: A disc-type commutator is mounted on a rear end surface of an armature of an electrical rotating machine. Plural commutator segments are radially arranged around a rotating shaft, separated from one another by radially extending commutator gaps. A width of the commutator gap is gradually widened along a radial direction of the commutator, so that foreign particles, such as swarfs or brush dusts, entered in the commutator gap are removed by a centrifugal force generated in rotation of the armature. Further, the width of the commutator gap may be gradually widened along its depth direction so that the width becomes wider at its open end that at its closed end.

Abstract: A vehicle blower motor includes a housing having a first bushing mounted at a first end about a shaft extending through the housing. A one-piece brush card bushing holder is mounted in the second end of the housing and carries a plurality of brushes engagable with a commutator mounted on the shaft. A second bushing is mounted in the brush card holder and disposed in engagement with the shaft. A portion of the brush card holder is formed as an end plate covering the second end of the housing.

Abstract: An electric motor-and-gear assembly for driving vehicle aggregates such as windshield and rear window wipers, power-window units and the like, having a transmission housing that can be closed by a housing cover. A motor housing that contains a commutator motor whose commutator protrudes into the transmission housing and cooperates with a brush holder fixed in the transmission housing. For the sake of a more reasonably priced manufacture and a time-saving, more rapid assembly of the brush holder, the commutator brushes are embodied as hammer brushes with spring leaf actuators prestressed toward the commutator. The spring leaf actuator are respectively fixed with their one actuator end in a U-shaped plastic carrying part of the brush holder, which is inserted into the transmission housing radial to the commutator, through the housing opening and is positioned in the transmission housing in a positively engaging manner by means of the housing cover.

Abstract: An brush assembly is provided in which electric power losses in brushes 32 are reduced, thereby suppressing an abnormal or excessive rise in temperature of the brushes. A tip end of a lead wire 33 inserted into a corresponding brush 32 in a direction of pressing upon press molding thereof is embedded in the brush in such a manner that it extends over two thirds or more of the length in the pressing direction of the brush 32.

Abstract: An improved carbon brush assembly for an electric tool, particularly an electric tool that utilizes electromagnetic force to drive a tool shaft. The carbon brush assembly includes a carbon brush, a carbon brush seat, a constant force spring and a cover. The carbon brush seat has the constant force spring fitted therein. The carbon brush always abuts against a plate portion of the constant force spring in the carbon brush seat. An electric tool housing is formed with a through hole corresponding to the carbon brush seat for passage of the carbon brush. A sunken space is formed around the through hole for embedding the carbon brush seat. The outer edge wall of the sunken space may just insertably grip the edge of the cover such that the cover forms a part of the housing after assembly to shield the carbon brush seat embedded in the housing. By virtue of the constant force spring, the carbon brush can be subjected to a more uniform biasing action to thereby prolong the service life of the carbon brush.

Abstract: A universal motor 10 has a brush holder assembly 12 which is fixed to a support bracket 14 using a single fastener 42. The brush holder assembly uses a terminal cap 20 to secure the brush 22 and brush spring 24 within the brush holder 18. The terminal cap is fixed to the brush holder and compresses the brush spring by movement of the terminal cap in a single direction.

Abstract: The present invention provides a brush holder assembly enabling a common brush holder frame to be used regardless of the direction in which a lead is to pass out, improving productivity and preventing decreases in quality due to the incorrect mounting of parts, etc. A plurality of brush holder frames are secured to a base such that the openings of respective brush receiving recesses face a passage and the axes of the brush receiving recesses are directed towards the central axis of the passage. Lead outlet grooves are disposed in both sides of each of the brush holder frames so that each extends from a first end towards a second end and joins the respective brush receiving recess to the outside. Brushes are inserted into the brush receiving recesses so that leads attached to the side thereof pass through one of the lead outlet grooves in said brush holder frames and are held by each of the brush holder frames.

Abstract: A brush assembly preferably for a universal motor comprises a tubular brush holder 13, a carbon brush 33, an arm 31 for biasing the brush and a spring 85 for biasing the arm. The brush is slidably mounted in the cavity 21 of the holder. A stop 61 is formed between the brush and the holder and has a disengaged position to permit travel of the brush partially through the inner end 25 of the holder and an engaged position to limit travel of the brush through the inner end 25 of the holder. The electrically conductive arm 31 is pivotally mounted on the support and extends through a slot 29 of the holder. A distal end 60 of the brush engages the outer end 53 of the brush and biases the brush 33 toward the inner end 25 of the cavity. The spring 85 is connected between the support 15 and the arm 31 for biasing the arm 31 into engagement with the brush 33. The arm is spaced outwardly of the end of the slot to apply a bias to the brush when the stop is in an engaged position.

Abstract: A brush system for an electric motor is adapted to electrically connect a commutator with at least one field terminal of the motor. The system is provided in a housing of the motor and is accessible via an opening in the housing. In this system, at least one electrically conductive brush is held in contact with the commutator by an electrically conductive brush box, which has an electrically conductive connecting tab depending therefrom. The connecting tab is adapted to be connected to the field terminal. Also included is a frame which is configured and adapted to fixedly receive the brush box. A through hole is provided on the frame for allowing the connector tab to extend through the frame and connect to the field terminal. Further, an access door is configured and adapted to be latched to the opening in the housing by a latch device attached to the access door.

Abstract: In a starter having a motor yoke, a housing and an end frame forming a cylindrical starter frame, a cylindrical thermal insulation cover is fitted around the starter frame through rubber-made elastic rings. The rings are tightly fitted in V-shaped grooves formed circumferentially on fitting faces, one being between the housing and the yoke and the other being between the yoke and the end frame. Each ring is pressed radially inward by a large diameter part of the thermal insulation cover to fill in the V-shaped groove and contact the fitting face. Further, in a motor for the starter, a resilient plate sheet is disposed between a commutator and a brush holder to return a brush passing therethrough to the original position when the brush tends to move during sliding contact with the commutator.

Abstract: A thermal protection mechanism for electric motors is disclosed. A brush is urged into electrical contact with a commutator by a primary brush spring. A thermally deformable fastener releasably secures the primary brush spring to a brush housing. A secondary brush spring urges the brush away from the commutator with a force less than that of the primary spring. A thermal overload condition within the motor causes the thermally deformable fastener to substantially deform so that the force exerted on the brush by the primary spring is substantially reduced. The force exerted by the secondary spring overcomes the primary spring so that the brush is forcefully disengaged from electrical contact with the commutator, thereby terminating operation of the motor.

Abstract: In a brush holder device, in which an action-side end portion 22a of a torsion spring 22 is engaged with a torsion spring engaging groove 25 recessedly provided in an end surface of the brush 24 on the side opposite to a commutator 23, so that the elastic force of the torsion spring presses the brush against the commutator 23, a first inclined surface 26 is formed in the end surface of the brush 24 so as to incline at an angle of 15.degree. relative to a plane perpendicular to the axis of the brush, and second inclined surface 27 is formed in the engaging groove 25, being superposed on the first inclined surface 26. Further, a pigtail 28 is connected to the brush at an offset point relative to the engaging groove 25. Because of the second inclined surface, the torsion spring can suppress so-called "wild behavior" of the brush, and thereby, can prevent brush sound. The angle of inclination of the first inclined surface can be set at a small value, the brush can be molded using a molding die.

Abstract: A brush holder assembly for mounting on an electric machine casing. The brush holder assembly includes a brush, a brush guide that supports and guides the brush for travel, a spring for biasing the brush in a direction toward a commutator, and an electric insulator mounting for mounting the brush guide on a casing. The electric insulator mounting has electric insulator elements containing grooves engaging the side edges of the brush guide to support the brush guide and the brush in spaced relation to a casing when the brush holder assembly is mounted thereon. The brush guide has at least one wiring tab. Several forms for attaching the insulator elements to the casing are disclosed including threaded fasteners; integral grommet formations of the insulator elements; and the insulator elements being integral formations of the casing.

Abstract: A carbon brush for an electric machine, resiliently acting on a collector, is arranged within a guideway so as to be movable radially to the collector and is inflexibly connected with a bending leg. The carbon brush allows easy and cost-saving assembly in a motor and electric contacting. The bending leg serves the resilient advance of the carbon brush towards the collector, on the one hand, and the electric power supply, on the other hand.

Abstract: The invention relates to a brush holding device used in a motor, and a method of assembling a brush holding frame onto a base plate in the brush holding device. In the brush holding device, flanged portions are protruded from both sides of a lower portion of a brush holding frame, and a pair of fixing portions each having a recessed portion substantially identical in shape to a cross-sectional shape of a corresponding one of said flanged portions are provided. The brush holding frame is inserted between the fixing portions while being slid on and along a base plate surface until the flanged portion on both sides of the brush holding frame are respectively fitted to the recessed portions of the fixing portions. Cover portions are provided on the brush holding frame at a level lower than the guide hole so as to cover the fixing portions when the fixing portions and flanged portions are fitted together.

Abstract: An electric rotating machine has an armature coil comprising outer and inner coil trunks disposed in slots of an armature core as well as outer and inner coil arms disposed along an axial side surface of the armature core. The outer coil arms are arranged to operate as a commutator and in slidable contact with brushes. The diameters of the radially outermost parts of the outer coil arms and the brushes are larger than that of the radially outermost surface of the outer conductor. This arrangement assures a larger commutator-brush contact area that reduces current density as well as heat generation in the commutator-brush contact area. As the radially outwardly extending parts of the outer coil arms are exposed to the surrounding air, the outer coil trunk, the outer coil arm and the brushes as well as the radially outwardly extending part are cooled effectively during rotation of the armature core.

Abstract: The invention relates to a collector machine, in particular an electric motor, having a rotor, rotatably supported in a housing and having an armature winding and a collector. The collector for electrically contacting the armature winding cooperates with at least two brushes resting slidingly on the collector, which are each displaceably guided counter to an initial tension in a respective quiver provided for each brush on a brush carrier plate. In accordance with the improvement according to the invention, at least one contact element, which is part of an associated quiver and for one pole of the electrical contacting establishes an electrically conductive contact with the housing.

Abstract: A commutator system comprising a commutator and a commutator brush. The commutator has electrically conducting surfaces that are electrically separated from each other by non-conducting segments. The edges of the conducting surfaces adjacent to the non-conducting segments are oriented at an angle to the rotational axis of commutator. The commutator brush has edges oriented at substantially the same angle.

Abstract: In a starter, a power supply terminal connected to a solenoid coil of a magnet switch and connectable to a starter external circuit is provided on an end cover. The power supply terminal includes a terminal metal member, a bimetal which interrupts electric conduction between the solenoid coil and the terminal metal member at the time of temperature rise above a predetermined temperature, and a casing contacting a foot part of the terminal metal member and encasing the bimetal therein. The bimetal responds to each of the excessive heating of the terminal metal member and excessive energization current to interrupt the conduction. In case of a single axis-type starter, the power supply terminal is provided on a recess so that the terminal metal member does not extend axially beyond the rear end face of the end cover.

Abstract: The present invention offers a commutation assembly for an electrical motor, whereby a constant optimal pressure is maintained upon the commutator of the motor.

Abstract: An improved method for the manufacture of a compact brush guide holder assembly which is commonly found on machines in which electricity is to be transferred between an electrically conductive brush element as it moves and makes contact with a rotatable conductor such as a commutator. The brush holder assembly has an open body guiding channel, or chamber, for supporting the electrically conductive brush element which receives compressed tension from a fixed non-removable constant force spring which is composed of a beam uncoiled section in addition to a coiled section having fixed mounted Teflon bushings that are free to ride and float horizontally and vertically on mounting post that pass through its center. Upon compression, the contour structural integrity and memory characteristics of the constant force spring are maintained as it self adjusts to the dynamic loads and tension requirements of a rush as it biases a commutator.

Abstract: Indicators of incremental brush wear are disclosed. Versions of the indicators may comprise signal wire assemblies embedded in brushes so that they continuously contact rotating components of electrical machines. Each such wire assembly typically is chosen so that its nominal electrical resistance differs from that of its corresponding brush, while its mechanical properties remain similar to those of the brush.

Abstract: A resilient thin sheet is used for a brush instead of a conventional brush unit which includes coil springs, pig tails and graphite brushes. A slip ring is made of perforated copper which is impregnated with carbon powder. The brush has two arc-shaped arms extending along the circumference of the slip ring and contacting portions disposed at the edges of the arms which are in contact with the peripheral surfaces of the slip ring. Wear resistant members are welded or caulked to the contacting portions to prevent excessive wear of the brush, thereby increasing the life of the brush.

Abstract: A brush holder assembly comprises a non-conductive brush holder body covered by a printed wiring board cover. The brush holder body includes a brush cavity for holding a brush, a spring cavity for holding a spring and a shunt wire cavity for holding a shunt wire. The spring is configured to hold the brush in contact with a commutator at a constant brush pressure throughout the entire length of brush travel. The brush holder body and printed wiring board cover are configured to enclose the brush, spring and shunt wire thus protecting the brush, spring and shunt wire.

Abstract: This invention relates to a carbon brush for an electric motor. These carbon brushes are guided in tubular brush holders and are pressed against a commutator. Furthermore, the brushes of the present invention include inclined side edges so that the front frontal surface has a trapezoidal cross-section. The consequence thereof is that, when sliding along the commutator, the commutator bars will always support the side edges over the major part of their length. The ratchet effect is thus suppressed.

Abstract: The invention provides a brush cartridge for a commutator-type motor. The brush cartridge includes a housing that is made of an electrically conductive material and that has an integrally formed terminal so that the cartridge can be plugged into a circuit without the need for wiring. The brush cartridge also includes a brush supported in the housing for sliding movement relative thereto and a spring member for biasing the brush into engagement with a commutator on the motor when the cartridge is installed. The brush cartridge also includes a flexible shunt connected between the housing and the brush. The shunt limits the range of sliding movement of the brush to permanently retain the brush in the housing.

Abstract: An improved brush assembly is provided for conducting electrical power from a fixed power system to a rotating ice protection system. The invention is especially adapted for use with an aircraft propeller ice protection system. According to an aspect of the invention, the brush assembly has a housing with a brush enclosure, the enclosure having slots provided therein for slidably receiving a plurality of brushes. A plurality of wear inserts are disposed in the slots adjacent the brushes in order to provide a wearing surface to prevent excessive wear of the brushes.

Abstract: A substantially enclosed brush holder assembly includes a brush fixture of singular piece construction for use in a harsh operating environment, such as that in which a motor vehicle alternator operates. An exemplary brush holder assembly according to the present invention includes a brush fixture for use in connection with a dynamoelectric machine. The brush fixture has at least one brush compartment that is configured to receive a brush. The brush fixture also includes at least one set of spring coil compartments, each of which are designed to receive one of two spring coils of a constant force extension spring. These spring coil compartments are adjacent to and in open communication with the brush compartment, thereby allowing the constant force extension spring to be extended through the brush compartment and peripherally around the brush located therein.

Abstract: To inform a user of wear on a carbon brush for a motor earlier than when the carbon brush is actually required to be replaced with a new brush. In a motor brush wear indicating device, a metal terminal is attached to a brush holder, being opposed to the inside of a holder shank of the brush holder, and an indicator is operated when the metal terminal contacts a brush spring. The metal terminal has a contact in the middle of a length of the brush holder. The indicator can be operated while the carbon brush is continuously pressed against a commutator by the brush spring. The metal terminal serves as a leaf spring. When the carbon brush is worn and shortened, the indicator is operated. Even after the indicator operates, the carbon brush is still pressed against the commutator by the brush spring. Therefore, the user can operate a motor-driven tool for some time before the carbon brush must be replaced with a new one.

Abstract: A brush structure for a motor is provided for realizing an equalization of wear of brushes without causing an early wear of a specific brush while not necessitating a complicated conduction controlling device. A first brush, which is one of four brushes, conducted at both Lo mode and Me mode is formed to have a larger sliding contact area for contacting a commutator slidably compared with a sliding contact area of a second brush which is conducted at Hi mode only. Current density in the first brush at Lo mode and Me mode becomes smaller than current density at Hi mode.

Abstract: An electrical brush having a wear indicator in the form of a marking substance within the brush which removes a film from a rotating collector surface of an electrical device just prior to the brush becoming worn to its minimum length. The removal of the film leaves a bright streak on the collector surface, and provides a visual indication that the brush is in need of replacement.

Abstract: A brush system for providing an electric connection to a rotating commutator wheel of an electric machine is disclosed. The brush system has a switched brush selectively switchable between an engaged position and a disengaged position and a switch connected to the switched brush and formed of a shape-memory-alloy. The switch attains an extended state at a first temperature and attaining a retracted state at a second temperature, for switching the switched brush alternately to the respective engaged position and the respective disengaged position. The switch includes a temperature conditioner for varying a temperature at the switch between the first temperature and the second temperature. The temperature condition may be an electric network wherein the internal resistance of the switch allows for heating of the switch to the second temperature.

Abstract: A liquid pump has a DC motor and a pump in a cylindrical casing. A pair of brushes are slidably contacted with a commutator of an armature while being biased by springs. The specific resistance of the positive brush is lower than the specific resistance of the negative brush to enable the voltage drop at the brushes to be decreased and motor efficiency to be increased without increasing commutator wearing speed. The biasing force provided by the spring biasing the positive brush is lower than the biasing force provided by the spring biasing the negative brush.

Abstract: Deformation absorbing grooves 16a are recessedly provided on the inner surfaces of both side walls 15a of a main body 15 of a brush holder made of resin in the sliding direction of a brush 44, and brush holding surface portions 16b holding both end edge portions of the outer surfaces of the brush are formed at edge portions of the grooves 16a on the inner surfaces of the side walls 15a. A pair of first reinforcing ribs 16c are projectingly provided at closing end sides of cutaway portions 18 and 19 on the outer surfaces of the both side walls 15a in the sliding direction of the brush, a pair of second reinforcing ribs 16d are projectingly provided at both top sides of the outer surface of a top side wall 15d for closing an end surface across the tops of the both side walls in the sliding direction of the brush, and an end portion 46a on the reaction side of a torsion spring 46 is engaged with an engageable portion 21A projectingly provided on the first reinforcing rib 16c.

Abstract: In an armature of a starter motor, commutator bars are formed by bending one end portions of upper layer armature conductors toward the inner circumferential side in the radial direction along an axial end surface of an armature core. A brush which slidably contacts commutator bars is constructed in a multi-layered type comprised of two kinds of brush materials each having different specific resistance layered in a rotational direction of the armature.

Abstract: An electrical commutator machine which serves to actuate units is proposed. The commutator machine comprises a ring-like carrying plate, which surrounds the axis of rotation of the commutator, for tubular guide casings which are made of metal, have a square cross section, are permanently connected to said carrying plate and in which brushes belonging to the commutation device are guided along the longitudinal axis of the tube and are placed under load on a contact face of the commutator. A particularly simple and advantageous structure of the commutator machine is produced if, in order to secure the casing on the carrying plate, at least two tongues which are upright with respect to the wall plane are arranged on one of the casing walls, to which tongues there are assigned insertion slits which are located in the one end of the carrying plate and detain the tongues.

Abstract: A brush holder for an electrical machine, and in particular a hammer brush holder, can include a carbon brush inserted with one of its ends provided with a brush shunt into a pot-shaped receptacle part of the brush holder. The carbon brush is retained in the receptacle part by means of clamping. A reliable clamping of the carbon brush is guaranteed by providing a scraper rib on at least one side wall of the receptacle part and designing it to ascend from the entry slot of the receptacle part toward its pot-like bottom with respect to its height and/or its width pointing into the receiving space of the receptacle part. The brush holder may be manufactured from plastic, and the carbon brush is inserted with a clamp locking force fit into a receiving opening of the brush holder.