Abstract: An electric rotating machine includes a guide groove in a brush holder fixedly disposed sideways of a commutator, a coil spring mounted under compression between a closed outer end of the guide groove and a brush for exhibiting a spring force to bring an end of the brush projected from the guide groove into sliding contact with the commutator, and a cover mounted to the brush holder to cover the guide groove. The guide groove is provided at its closed outer end with a recess for receiving and holding one end of the coil spring. The brush holder includes a main holder portion having the guide groove, and a fastening portion connected to one side of the main holder portion and having a single threaded bore. The cover is of a shape to cover the brush holder and has an engage portion engages an outer side of the brush holder so as to inhibit the turning of the cover about the axis of the threaded bore. A threaded member is inserted through the cover and screwed in the threaded bore.

Abstract: A brush apparatus for a rotary electric machine has a brush with a pigtail, a brush holder and a spring. The brush holder is formed with a slit and a stopper piece. The pigtail is passed through the slit when the brush is inserted into the brush holder, and thereafter the stopper piece is bent to close an opening the slit. Thus, the brush apparatus simplifies an inserting operation of the brush to the brush holder and prevents the brush and the spring from coming off due to wear of the brush.

Abstract: An electric motor comprising a rotatably mounted rotor, a commutator brush retainer mounted fixedly with respect to the rotor, wherein the commutator brush retainer rotates with the rotor, at least one brush slidably mounted to the commutator brush retainer, wherein the brush is slidable in a radial direction between a radially retracted position and a radially extended position, and a spring connected to the commutator brush retainer and to said one brush, wherein the spring biases the one brush to the radially retracted position and, wherein, during rotational movement of the motor, centrifugal force moves the one brush toward the radially extended position, wherein, as a rotational velocity of the rotor increases, the one brush moves closer to the radially extended position.

Abstract: A carbon brush holder for a commutator motor which a carbon brush is replaceably installed in and which can facilitate assembling of the carbon brush holder and the carbon brush, and easily dissipate heat produced from the carbon brush, enhancing the function of the carbon brush. The carbon brush holder for a commutator motor used for as a housing of a carbon brush connected to a brush terminal via a flexible copper conductor reduces frictional contacts of side surfaces of the carbon brush and inside surfaces of the brush holder body which has no cartridge-formed conductive insert, and prohibits electric short phenomena therebetween. Thus, the generation of heat is reduced.

Abstract: A starter which optimally maintains the characteristics of a spring which presses a brush and reduces its axial direction length. A compressed coil spring is arranged around an outer circumference of a plunger of a magnet switch and the length of the spring can be set as long as the radial direction length of the magnet switch. The spring effectively uses the space around the outer circumference of the magnet switch, so the axial direction length of the spring need not be added to the axial direction length of the starter.

Abstract: A monitoring system is disclosed to automatically indicate excessive wear of electrical brushes in deicer assemblies for aircraft. In the preferred embodiment, the indicator system includes an electrical brush with an initially insulated wire embedded in it; and an electrical detection circuit, connected to the brush, with a warning device such as a light. When the brush becomes worn, through excessive "end wear" and/or "flank wear", the insulated wire becomes exposed and eventually stripped at the point of wear. This creates a conductive path from the electrical brush, through the bare wire spot, to the detection circuit. This turns on the warning device to indicate that the brush has become worn and needs replacement.

Abstract: A brush assembly structure for a motor has a brush holder integrally formed in substantially a C-shape so that free ends of leg portions of the brush holder are positioned at diametrically opposed side positions of a commutator. Brush accommodation units are formed at the free ends of the leg portions. Brush springs are attached to the cylindrical bottom portion of a holder stay unit. The brush springs elastically depress brushes accommodated in the brush accommodation units at the moment when the brushes reach the diametrical side positions of the commutator. When the brush unit is assembled to the holder stay unit in accordance with the invention, the brushes are protected during assembly and an assembly job is simplified.

Abstract: The invention relates to a carbon brush (10) with a braided indicator wire (26), (28) for indicating a defined wear of the carbon brush. The braided indicator wire is embedded in a blind bore (30), and is disposed spaced apart from the bottom (32) of the blind bore. To assure an exact indication of the wear of the carbon brush, the bottom of the blind bore is covered with a layer (40) consisting of an insulating material.

Abstract: A brush holder assembly for an electric machine such as a motor that utilizes a constant force spring positioned within a U-shaped retainer to apply a constant force on a brush positioned against the spring within the retainer. The brush, spring and retainer are positioned within a container mounted on the housing of the electric machine. A removable cap is mounted in the radially outer end of the container to maintain the brush and spring in proper position during operation and allow easy removal and replacement of the brush when needed.

Abstract: A brush assembly for an electric motor has a brush 20, a brush terminal 30 and a brush spring 40. The brush spring is fashioned from an elongate strip 41 of resilient, electrically conductive material and is fixed to the brush terminal at its ends to form a loop with an intermediate portion fixed to the brush to electrically connect the brush to the brush terminal and to urge the brush into contact with a commutator of the motor. Brush guiding arrangements for guiding the brush to the commutator has a guide pin 51 fixed at one end 52 to the brush terminal and co-operating with a guide hole 21 formed in the brush to define the position of the brush on the commutator 11.

Abstract: A brush holder for mechanically commutated electric motors has a support plate, a shaft-like guiding container mounted on the support plate for guiding a sliding brush pressed by a spring force against the commutator of an electric motor. The guiding container has side walls extending transverse to the support plate and provided with legs. A pressing spring is formed as a strip-shaped flat spring and has end portions which are oppositely rolled to form rollers abutting against the legs of the guiding container on surfaces of the legs which face the commutator and also have a central portion arranged to load an end surface of the sliding brush facing away from the commutator.

Abstract: There is presented an electric motor having a drive shaft, an armature and a commutator fixed on the drive shaft, a housing disposed around the armature, magnets disposed between the armature and the housing, and an endframe fixed to the housing. The endframe has therein a journal for retaining the drive shaft, brushes for contact with the commutator, and shunts and terminals connected to the brushes. In the endframe are brush tubes for slidably retaining the brushes and coil springs for urging the brushes into engagement with the commutator. Each brush tube has one of the coil springs therein, an outer end, side, front and rear walls sufficiently closed to prevent egress of the coil spring, and an open inner end through which one of the brushes engages the commutator. An internal wall of the brush tube is provided with a barb integral therewith and extending inwardly of the brush tubes to overlie a portion of the coil spring proximate the brush tube outer end.

Abstract: A small size electric motor has a housing having an opening, a heat conductive bearing shield arranged to close the opening, a commutating device provided with commutator brushes in the housing. The bearing shield has a first guiding wall and at least one second guiding wall arranged at a distance from one another for guiding the commutator brushes. A heat conductive isolating layer is located between the guiding walls and the commutator brushes which are guided on the guiding walls with a small play.

Abstract: A fluid-resistant brush holder assembly having a hollow metal cylinder body with internal threads at a first end and a second end forming a brush channel. An electrical connector having a first portion is mechanically and electrically connected to the body. A connecter tab extending away from the electrical connector is provided for making contact with an electrical power source. The outside surface of the body and the first portion of the connector are encapsulated in a molded nonconductive material. The molded nonconductive material provides the connector with structural rigidity and fixed orientation with respect to the body. A metal threaded cap having a hollow interior is provided for screwing into the interior threads in the body and capping the first end of the body. The head portion of the body cap seats against the body to seal the first end of the body. A brush cap is fitted into the hollow interior portion of the body cap.

Abstract: A brush holder structure in an electric motor in which brush holders for housing brushes held in slidable contact with a commutator provided on a rotor shaft and an end bracket for rotatably supporting the rotor shaft are both integrally molded with a gear frame for housing and supporting a worm gear mechanism. The worm gear mechanism includes a worm formed around the distal end portion of the rotor shaft and a worm wheel held in mesh with the worm. A lead-out groove for leading out a pig tail extended from each brush is formed in a proximal end side wall of each brush holder with respect to the rotor shaft, and a receiver for receiving resilient spring fitted in each brush holder to press each brush against a commutator is disposed between two proxiamal and distal end side walls of each brush holder. The receiver extends in the axial direction of the rotor shaft, and is set to have its width not exceeding the width of the lead-out groove in the circumferential direction of the rotor shaft.

Abstract: A pendulum roller head for a resistance seam-welding machine is described, having a sliding contact current transmission device between a stator and a rotor, which device is composed of an annular disc which extends radially between rotor and stator, is fastened by its outer circumference to the stator, carries an axial sliding contact ring on its inner circumference, and is flexibly designed in its bridging part between the inner and outer circumferences. The sliding contact disc is composed of a copper braid to which the axial sliding contact ring is fastened. The sliding contact current transmission device in the form of the disc with a flexible bridging part replaces the current transmission device in the form of fluid metal which has formerly been in use in pendulum roller heads.

Abstract: A separately-excited fractional-horsepower electric motor in which a field coil is connected to one of the brushes by means of a brush retainer which is formed with a plug portion such that, on fitting the brush retainer to the brush holder, the plug portion penetrates and engages a socket connected to the field coil.

Abstract: A motor-driven fuel pump including a cylindrical housing; a pump section fixedly mounted at one end portion of the housing so as to close the one end portion; a motor section mounted in the housing for driving the pump section; and a cover member fixedly mounted at the other end portion of the housing so as to close the other end portion by caulking an end of the housing; wherein an outer end surface of the cover member projects outwardly from the caulked end of the housing to increase a wall thickness of the cover member without increasing a total length of the housing, whereby a sound from the motor section is reduced.

Abstract: A spring carbon brush which can be slid into a holder is blocked in the corresponding feed position on the holder when acted on by forces opposed to the direction of feed by a catch or expansion device in such a way that it can only move in the direction opposed to the direction of feed by overcoming an additional, preferably gradual, elastic force.

Abstract: A brush holder assembly for use in a dynamoelectric machine has an electrically conductive support and is releasably mounted on a part of the frame of the dynamoelectric machine. The support has a freestanding front terminus, and a plurality of individual brush holders are each mounted by a detachable connection to the front terminus in side-by-side relation to each other. The detachable connection permits individual replacement of the brush holders. The brush holders each have a front end and a quick disconnect mount on the front end. A brush which is insertable in the brush holder has a disconnect terminal connectable with the mount. A constant brush force applying mechanism is located on the front end of the holder. The detachable connection, brush holders, constant brush force applying mechanism, quick disconnect mount and disconnect terminal are all adjacent each other to be accessible at the front terminus to facilitate safe and fast service thereof.

Abstract: An apparatus for detecting the wear of a motor brush includes a spring that biases the brush towards an extended position. A portion of the spring moves along a path towards the extended position as the brush wears, wherein the spring portion makes mechanical contact with a portion of an electrical signal generating device that is disposed in the path to indicate a given amount of brush wear has occurred.

Abstract: A brush assembly for a commutator type electrical machine includes a biasing spring for biasing a carbon brush toward a commutator. The brush assembly also includes a brush guide having a passageway portion formed to guide the carbon brush. A spring retainer is slidingly received within the brush guide and is disposed between the carbon brush and the biasing spring. An enlarged portion of the spring retainer cooperates with an annular shoulder formed within the brush guide to form a stop surface to limit rectilinear movement of the spring retainer within the brush guide and consequently the biasing spring when the brush is substantially worn out.

Abstract: The wear upon at least one of several carbon brushes in a brush holder is monitored by a lever one arm of which is biased against the rear end face of a selected brush by a spring and another arm of which actuates a microswitch in response to a predetermined amount of wear upon the brush as a result of engagement with a commutator or a slip ring, namely in response to a predetermined angular displacement of the lever from a starting position which is assumed by the lever when its first arm engages a freshly inserted brush.

Abstract: A long-life motor brush holder which significantly minimizes contact of the coil portions of a ribbon spring with the holder and consequently reduces friction drag; the arrangement is such that at least two cylindrical surfaces forming part of the brush holder serve as line contact supports for each of the respective coil portions of the ribbon spring so as to produce minimal contact, the spring including a middle portion for residually engaging the brush to urge it against the motor commutator.

Abstract: Brush rigging for a dynamoelectric machine such as an electric cranking motor for cranking an internal combustion engine. A support carries a plurality of radially extending brush holders each of which slidably supports a brush. The brushes are urged radially inwardly by an elastomeric band that is formed of electrical insulating material. The band directly engages the outer ends of the brushes and a plurality of pins that are carried by the support. The pins are located between pairs of brush holders.

Abstract: A brush wear indicator for a dynamoelectric machine, such as a direct current motor, comprises a fiber optic conductor coupling an emitter and a detector. The fiber optic conductor is fed into a brush holder where it is supported by a spring holder to which is attached a coiled biasing spring. The fiber optic conductor includes a region of separation where an element actuated by the biasing spring operates to complete or interrupt a light path between the exposed ends of the conductor at the separation. In one embodiment, an angulated tab secured to the spring operates as a shutter to move in and out of the spring holder to complete or interrupt the light path, while in a second embodiment, a rubber flexible diaphragm having an inwardly projecting body portion is actuated by the spring, by moving in and out of said region of separation to complete or interrupt the light path.

Abstract: A brush wear detector and indicator for the brush elements contacting the rotating commutator or slip rings of a dynamoelectric machine includes, in addition to a self winding bias spring located on the brush holder for applying force to the brush assembly, a permanent magnet, located either on a brush element or the bias spring, and a reed switch located on the brush holder adjacent the assembly. The magnet moves inwardly as the brush element wears and actuates the read switch at a point indicative of a worn condition. Activation of the reed switch causes an indicator such as a lamp to become energized, signalling a need for brush element replacement.

Abstract: Disclosed herein is an electrical brush (1) having a brush wear sensor (9) in the form of a loop (10, 11, 13) of insulated electrical conductor having two arms joined by a looped end, the arms leading from an upper surface of the brush to a depth (d) to be equivalent to the point at which brush wear is to be sensed. A pair of fine bores (5, 6) lead from the brush upper surface to meet a transverse hole (8) in a side face of the brush at the wear depth. Each arm of the sensor loop lies in a respective one of the fine bores with the looped end disposed in the transverse hole and joining the respective arms in the fine bores. Assembly preferably is by insertion of the free ends of the arms of the loop of insulated electrical conductor into the transverse hole and then separately into and through respective ones of the fine bores.

Abstract: A brush wear monitor system for dynamoelectric machines includes a sensor imbedded in a brush to provide a signal indicating a predetermined amount of brush wear. The brush wear signal is provided through an isolation network to an indicator circuit. The indicator circuit includes a first indicating lamp which is illuminated in the absence of a signal from the brush wear sensor to indicate normal operation and a second indicator lamp which is illuminated only in response to receipt of a brush wear signal from the sensor. Upon receipt of a signal the first indicator lamp is extinguished and the second indicator lamp is illuminated. A manually operated test switch is provided to check the operation of the indicator circuit.

Abstract: A brush assembly for an electrical machine has a holder having a pair of generally parallel side walls having confronting inner faces, a guide wall extending along and between the inner faces and in turn having an inner face defining with the faces of the side walls a passage extending in a longitudinal direction and having a longitudinally forwardly open front end, and an angled surface adjacent the front end. The brush in the passage has a longitudinal guide face longitudinally slidable on the inner face of the guide wall but out of contact with the side walls, an opposite longitudinal face turned away from the guide wall, and axially opposite front and rear ends. A coil spring has a coiled part engaged between the angled surface and the opposite brush face at the front end of the brush to transversely urge the brush against the inner face of the guide wall and a free end extending longitudinally back along the opposite face longitudinally past the rear end of the brush.

Abstract: A carbon brush assembly comprises a brush box having a slit along one side thereof, and a carbon brush slidably mounted in the brush box with a spring connected between the brush box and the brush to resiliently urge the brush outwardly. An electrically conductive pin is inserted in a transverse bore in the brush and extends through the slit for movement therealong. A brush lead is electrically connected to the pin and a stop associated with the slit adjacent the outer end thereof. The stop forms a closed end of the slit for limiting movement of the pin therealong under the influence of the spring, and so retaining the pin in the slot when said brush wears out. Preferably, the brush is formed with breaking incisions in its sides adjacent the pin to enable the protruding end of the brush to break off and interrupt electrical connection with a commutator when the brush has worn to the end of its useful life.

Abstract: In a circuit for supervising the wear of carbon brushes making normally contact with a commutator of a direct-current electric motor of an electrically operated vehicle powered by an accumulator, and which includes main on-off switch for starting and stopping the vehicle, electrically insulated control brushes carried by the carbon brushes, and movable therewith, and a warning signal indicator normally connected to the control brushes, which provides a selectable optical and acoustic warning signal when the control brushes establish contact with the commutator upon a predetermined degree of wear of the carbon brushes, the improvement includes an electrical memory which has set and reset inputs, is connected to the control brushes, and controls the warning signal indicator. The control brushes set the memory upon establishing contact with the commutator.

Abstract: An electrical brush has a brush wear sensor incorporated in the brush body to indicate when the brush has worn to a predetermined point. The sensor comprises a length of insulated electrical wire doubled back onto itself intermediate its ends and located in a passageway, preferably a blind bore, extending from a surface remote from the wear surface at least to the point at which brush wear is to be sensed. The end of the doubled back portion extends to the point at which wear is to be sensed, and the ends extend from the brush body for connection to one or more electrical sensors. A cement in the passageway retains the doubled wire, and the wires of the doubled wire may be twisted or looped about each other to increase adherence and retention. When the brush wears to the tip of the doubled wire, the wire insulation wears away, and contact of the conducting wire or wires with the commutator or the like is sensed.

Abstract: This invention relates to apparatus for detection and monitoring of improper operation of commutator-brush combinations conveying current to or from the electromagnetic rotary member of a motor or generator, and relates, more particularly, to means for detecting defective brushes in critical motor driven textile units such as yarn storage feeder devices which operate to store yarn temporarily for use by user means such as a loom.

Abstract: A brush wear detector comprised of an L-shaped leaf spring having the outer end of its longer leg mounted on a first insulating member in fixed relationship to a spring support for a self-winding, brush-biasing spring. A second dielectric member is secured to the leaf spring between the ends thereof and projects outward from the leaf spring into engagement with an uncoiled section of a brush-biasing spring. The free end of the leaf spring is held away from engagement with the brush-biasing spring support, thereby being electrically isolated from it, when a new brush is mounted in operating position under the brush-biasing spring. When the brush becomes worn a pre-determined amount the brush-biasing spring moves in a direction away from the second dielectric member and so enables the leaf spring to force its free end into electrically conducting engagement with the electrically energized spring support.

Abstract: This invention relates to a brush holder for a rotary electric apparatus comprising: a holder body having a brush frame for slidably holding a brush, a brush retainer pivotally secured to a holder arm attached to the holder body through a pin, a spring provided between the holder body and the brush retainer, a stopper mounted on the holder body for stopping the movement of the brush retainer at a predetermined position, and a contacting piece mounted on the stopper being electrically insulated from said holder body and positioned so that it comes into electromechanical contact with the brush retainer when the brush reaches the wearing limit.

Abstract: A brush wear indicator contact and terminal assembly having a high pressure-per-unit contactor that is formed on a first surface of the plate. A conductor for a brush wear indicator circuit is bonded to the contact plate by a high temperature resistant solder or brazing material and the contact plate is bonded to the surface of the dielectric sheet, which electrically isolates the contact from the spring when the spring is in an extended condition. By the method of the invention, a brush wear indicator contact and terminal assembly is made by adhering a sheet of dielectric material to a brush follower spring with a coating of permanently flexible adhesive, and by bonding a conductor for a brush wear indicator circuit to a contact plate having a contactor ridge on one opposite surface thereof.

Abstract: A rotor for a D.C. electric motor is disclosed, in which the rotor has a frontally arranged collector on which brushes are active, which are oriented parallel to the rotor axis. This arrangement considerably reduces the diametrical bulk of the motor. The brush angle is adjustable by means of an annular ring, internally threaded to the yoke.

Abstract: An interface circuit for use between a plurality of sensors, such as brush wear detecting sensors, and a single indicating alarm. The interface circuit is operable to transmit a signal from any or all of the sensors to actuate the alarm and latch it in its operative state until the alarm is de-energized by an operator.

Abstract: A brush holder assembly for electrically-coupling relatively movable conductors comprises a brush holder having a cavity which slidably receives a brush and having a pair of shoulders located on opposite sides of the cavity to confront a conductor. An electrically-conductive twin coil spring is mounted in the cavity with its saddle portion engaging one end of the brush and its coils disposed adjacent the shoulders for biasing the other end of the brush into contact with the conductor. An electrical contact member is interposed between at least one of the shoulders and its engaged spring coil to provide a current path into the side of the brush adjacent the coil for improving the overall performance of the brush assembly.

Abstract: A brush holder assembly has a body portion with a through opening and an externally accessible lateral opening communicating with the through opening and forming an internal shoulder within the body portion. A brush insert is slidably received within the through opening of the body portion and has an integral connection tab received within the lateral opening. The tab is bent over the shoulder to preclude axial withdrawal of the insert in one direction away from the body. A brush lead has a quick-connection terminal slidably received over the tab to make electrical connection to the insert within the lateral opening of the body. A brush is slidably received within the insert and extends beyond one end of the insert to engage a commutator. The other end of the insert is covered by a shunt cap, and a shunt is disposed between the shunt cap and the brush. A removable brush cap is secured to the outer end of the body, and a conical spring is disposed between the shunt cap and the brush cap.

Abstract: A brush assembly for electrical machines provided for the transfer of current from a stationary brush holder to a rotating contact part, wherein the stationary supporting structure includes a brush bar (brush magazine) having integrally formed stationary brush boxes in which a brush subassembly having at least one brush carrier element can be slidably mounted. The brushes mounted in the brush carrier element are slidably movable in a direction towards the rotating contact part, and are biased thereagainst by means of a spring, also carried by the brush carrier element. The sub-assembly, including the brush, brush carrier element, and spring, slides into the brush boxes and can be locked in position while being simultaneously electrically connected with the brush boxes.

Abstract: A brush wear indicator for an electrical machine including a holder for slidably mounting a brush, a self-winding, brush-biasing spring having one of its ends mounted in generally fixed operative relationship on the brush holder in combination with an indicating means electrically connected to either a contact, or a membrane switch, mounted on the relatively fixed end of the brush-biasing spring in a position such that it is contacted by a coiled portion of the spring responsive to the occurrence of a predetermined degree of brush wear. Such engagement is effective to actuate the signal means to indicate the predetermined degree of brush wear.

Abstract: A brush wear indicator for a dynamoelectric machine including a brush holder for slidably mounting a brush, a self-winding, brush-biasing spring having one of its ends mounted in fixed relationship on the brush holder, in combination with a circuit board having a dielectric member on which a plurality of electrical contacts are mounted in spaced relationship to be electrically engaged by the spring when it is fully extended to accept a new brush in the brush holder. As the brush wears, the spring moves downward to continue exerting a biasing force on the brush, and sequentially moves out of engagement with the contacts on the circuit board responsive to predetermined degrees of brush wear occurring. Such movement of the spring causes the contacts to be sequentially disengaged from the spring, thereby causing associated signal means, such as glow lamps, to be de-energized thus indicating the occurrence of the predetermined degrees of brush wear.

Abstract: A dynamoelectric machine (1), having brushes which contact an armature contact surface such as commutator (6) or slip rings, is provided with a plurality of independent, individually removable brush holders (10, 100). Each brush holder is provided with either a removable pin (102) to allow brushes to contact the armature contact surface after the brush holder (10, 100) has been installed, or with a clamping bolt (40), retaining brushes (8) in a predetermined position for insertion of the brush holder, and removal of the brush holder, the brush holder being tilted or cocked to avoid contact between it and the armature contact surface. Bolting the brush holder (10, 100) into place makes electrical contact between the dynamoelectric machine and the brush holder by means of an insulated, conductive threaded aperture (34) on the exterior service of the machine, a mounting bolt (24) inserted into this aperture (34) urging a conductive portion (20) of the brush holder into electrical contact.

Abstract: An indicator is provided in a dynamoelectric machine such as a DC electric motor wherein brushes are provided in brush holders to cooperate with a rotatable electrical conductor in the machine, for example, slip rings or a commutator. The indicator gives an indication when a brush has worn to a point where it should be replaced, and then an alarm sounds or a light is illuminated. The brush wear indicator includes an indicator contact which is electrically connected to the indicator means and it is insulated from but mounted to move in accordance with the brush wear movement. The contact is provided on the end of an electrical conductor which is embedded in the rear axial end of the brush so that the indicator contact will become exposed and the insulation covering it will be worn away upon sufficient brush wear. This completes an electrical circuit between the indicator contact and the commutator to thus provide an indication at the indicator means.

Abstract: Brushholder apparatus is disclosed for supporting electrically conductive brushes of a dynamoelectric machine in a manner facilitating improved cooling of the brushes and adjacent collector ring. The apparatus includes a brushholder assembly with a pair of legs to internally support a brush and may also include a casing arranged to retain several brushholder assemblies, provide an enclosure for properly directing cooling gas circulated by a fan, and furnish a common electrical link between brushholder assemblies and a source of electric current. An insulated handle is described which can be inserted into the brushholder assembly and manipulated to lock handle, brushholder assembly, and brush together as a unit to permit safe removal of the brushholder assembly and associated brush from the casing and installation of a new brush during operation of the machine.

Abstract: A wear-indicating brush and warning circuit is adapted to convey an indication that a dynamoelectric machine is in need of maintenance before the brush wears to the point that a rotor contact surface is damaged by contact with electrical connections to the brush. A brush (10) having current carrying pigtail leads (16) embedded therein includes a wear-detecting wire (20) embedded in the brush a short distance (A) beyond the lowest extent of the pigtail leads (16). The wire (20) is insulated over its periphery, including its tip (24), the insulation (26) being abraded by contact with the rotor contact surface (50), so that the wire (20) senses the voltage present thereon. Non-latching warning circuits (66, 66a), with and without the use of an isolating resistor within the dynamoelectric machine to permit the use of a single wire between the machine and the warning circuit to provide a brush wear indication.

Abstract: A brush holding device for an electric motor of small size, with a brush cap being removably mounted to a brush holder so that a brush can be replaced. The brush cap is constructed such that a pair of elastic arms axially extend from the both sides of a coil retaining portion and a vertical wall is formed with a key hole for preventing the brush cap from radially slipping out of the brush holder.

Abstract: A brush assembly for a motor or generator includes a brush, a holder, a spring for using the brush out of the holder, and a restraining washer between the spring and brush. The restraining washer prevents the spring from coming into contact with the commutator of a motor or generator when the brush has worn away.