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 commutator brush holder mounts a pair of tension band springs in quadrature relation. Both springs contact the brush end remote from the commutator and urge the brush into contact with the commutator, with constant force. The quadrature springs promote full and intimate contact between the brush and commutator, thereby minimizing brush bounce and tilt and resultant transient signal generation.

Abstract: There is disclosed an easily demountable brush assembly for electric motors utilized in portable electric tools. The assembly includes brush units which when removed from an open end of the motor casing provides ready access to the brush holders for the conventional carbon brush. Each brush unit includes a non-conductive board which is mounted radially with respect to the commutator of the motor. The boards are secured within grooves formed on the inner wall of the motor casing. Finally, the open end of the motor casing is supplied with a removable cap which holds the brush units in position when the cap is secured to the motor.

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-holder for rotating electrical machines includes a brush and a compression spring disposed in a shaped metallic sleeve encased in an insulating support adapted to be mounted on the frame of the engine. The insulating support includes at least one projecting stop which cooperates with a notch provided on the sleeve, so that the sleeve is precisely located at a predetermined longitudinal position within a sheath on the support. In addition to positioning the sleeve, the stop also serves to limit travel of the spring as the brush wears down.

Abstract: A brush holding device for an electric rotary machine for holding a brush electrically connecting the stationary part of the electric rotary machine to a rotating slip ring, the device comprising a brush box supported on the stationary part to accommodate the brush therein, a main wall detachably mounted on a main post extending from the brush box, a brush retaining element in the form of a band for retaining the brush in the brush box, a handle for carrying the main wall together with the brush, and a manipulating lever for unlockably locking the main wall to the brush box, whereby the brush can be easily and simply replaced.

Abstract: A brush assembly comprising an electrically insulating plate having therein an aperture with which communicate first and second slots. The slots each slidably receive a brush and a compression spring acts between the closed end of each of the slots and the respective brush to urge the brush slidably towards the aperture. The brushes and at least one wall of each of the slots are provided with mating surfaces whereby the brush may be latched in a retracted position relative to its respective slot against the action of its respective compression spring.

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 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: 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 worn brush indicator for machinery, e.g., a motor generator, wherein a carbon brush is in engagement with a moving contactor, e.g., a commutator or slip ring. The brush is made with an elongated cavity, and an insulated conductor is placed in the cavity. When the brush is worn to a point where the cavity is exposed and the insulating is worn away, the conductive member, having a carbon tip, engages the commutator, and an alarm circuit connected between the conductive member and the brush proper signals a worn brush condition.

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: A dynamoelectric machine having a rotatable conductor on which a reciprocally mounted brush rides is provided with a brush wear indicator, comprising, an electro-mechanical transducer connected between a self-winding, brush-biasing spring forming part of the brush holder assembly and a brush wear signalling means in order to actuate the signalling means responsive to a predetermined degree of brush wear that causes the brush biasing spring to move an active element of the transducer a predetermined distance thereby effecting such actuation.

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 current transfer brush with several slider members made of stacked arrangement of foils of highly graphitized graphite extending at least approximately perpendicular to the contact surface of the brush. At least one of the two flat sides of at least some of the graphite foils can be provided with a layer of an electrically conductive material.

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: Electromagnetic or solenoid means responsive to load current to automatically shift the brushes of a motor or generator a proper amount so as to maintain satisfactory commutation from light to full load, the brush shifting means including electric solenoid means carrying machine load current, movable brush holding means mounted on antifriction bearings, and mechanically connecting the electric solenoid means mounted on a machine frame means to brush holder means so as to shift brushes in conformity to changing load conditions.

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.

Abstract: A brush holding apparatus for a rotary electric machine permitting removal and replacement of brushes without stopping the rotation of the rotary electric machine comprises a brush holder which can be detached from a stationary unit, and a securing device for detachably securing the brush holder to the stationary unit. A manipulating lever is provided on the stationary unit to actuate the securing device. The brush holder can easily be mounted on or detached from the stationary unit by the manipulation of the manipulating lever for the puppose of removal and replacement of the brushes while the rotary electric machine is in operation.

Abstract: A tachometer generator for DC motors in which a brush carrier of insulating material is fastened to the tachometer housing at the end face. Brush holders are arranged on the brush carrier which, together with parts of the brush carrier, form a brush guides. A carbon brush and an associated coil spring is inserted into each brush guide and the coil spring is braced against an abutment of the brush holder. In order to simplify assembly of the brush holder and to improve the current transfer between the brush holder and the coil spring, a channel is formed on the brush carrier as a guide for each brush. The body of the brush holder has the shape of a plate and rests on the channel, forming a brush guide which is enclosed on all sides. Spreading arms are formed on the brush holder which snap into lateral cutouts alongside of the channel of the brush carrier. The coil spring is firmly connected to the brush holder by soldering.

Abstract: A brush wear indicator includes a first contactor and a second contractor movable relative to the first contactor from an open position to a closed position to connect an electrical circuit to an indicator. The second contactor is maintained in the open position against the resiliency of a leaf spring by a coil spring which urges a brush toward a commutator in response to wear to the brush. When the brush wears away to a preselected length the coil spring will have moved to a position at which the leaf spring is free to bias the second contactor to the closed position.

Abstract: Brush holder assemblies are disclosed which prevent the spring, or conductor and terminal connector from protruding out of the brush holder and damaging the motor commutator. The constructions employ a brush housing having a restraining bridge at the front end thereof and a terminal connector having a rearwardly extending flange. As the brush wears down, it and the terminal connector to which it is attached move forwardly in the brush housing under bias of a coil spring. Upon striking the restraining bridge the terminal connector pivots forwardly under tension of the spring thereby wedging the flange against the top of the housing preventing further movement of the brush assembly.

Abstract: The improved homopolar generator includes a unit carrying the brushes which may be easily removed from the yoke structure. The unit includes brushes, a portion of the return conductor and a movable segment of the yoke, and rides along tracks extending from within the yoke cavity to a position outside of the yoke cavity. The yoke segment included in the unit fits into a mating opening in the yoke, and the magnetic field created by the field coil holds the movable yoke segment in position against the yoke.

Abstract: A brush device for a miniature electric motor of a type, wherein the commutator brush is inserted into a brush holding member made of a leaf spring which is generally bent in the form of a letter "L", one side of which is in a slightly bent form at about the middle portion thereof with a brush fitting portion being provided at the extreme end thereof, and the other side of which is rectilinear with a fitting portion to the main body of the motor being provided at the extreme end thereof.

Abstract: A brush device for a small electric motor comprises an integrally formed commutator slide, a brush base and a terminal portion made of a thin material. A reinforcing piece is provided by bending the side edge of the base both to permit the brush device to be resiliently retained within a terminal insert hole formed in the motor case cover.

Abstract: This relates to the mounting of brushes in a rotary electrical joint in a manner wherein the frictional force applied to a brush by a rotary member is restrained so as to eliminate prior tilting of the brush in a manner wherein excessive wear occurred adjacent the leading edge of the brush. Most particularly, the brush is so restrained wherein any tendency thereof to pivot will occur generally about an axis disposed adjacent the leading edge so that there is a uniform force application of the brush against the rotary member and thus a uniform wearing of the brush.

Abstract: A brush which presses against the commutator of a machine has secured thereto a resilient spring contact element, and as the brush wears, movement thereof causes physical engagement of the resilient spring contact element with another contact element to complete a current path. The latter contact element is secured to a yoke which surrounds the commutator.

Abstract: The brush holder comprises a cage and a detachable clip. The cage serves to accommodate a brush and has a channel. The clip has a central leg positioned in the channel. A self-winding band spring for biassing a brush is fixed at its outer end to the central leg, which also includes engaging means, e.g. in the form of a tongue, for retaining the central leg in the channel. The clip has also two side legs bearing elastically on to the outer sides of the cage to prevent rocking of the clip relative to the cage. The central leg has preferably raised side edges and the cage is preferably cut out from a hollow cross shaped section.

Abstract: A motor brush for use in a miniature motor comprises a coil spring having both end portions extended to the outside, a contact member secured to the one end portion of the coil spring and biased to contact with a commutator by spring force, a stop member provided at a support member in a motor case for stopping the other end portion of the coil spring, and a column body secured to the support member for supporting the coil spring.

Abstract: A frame that has a central opening through it for the commutator of an electric motor is provided with a pair of brush housings, each having a passage therethrough in which a brush is slidable. One side of each housing is provided with a longitudinal slot, beside which a stud projects from the frame. The central coil of a torsion spring encircles the stud and has end portions extending laterally toward the housing, with the free ends of the spring biased toward each other. One end of the spring engages an abutment at the inner end of the housing and the opposite end of the spring extends through the housing slot and into a notch in the side of the brush to hold the brush retracted in the housing passage until the end of the spring is removed from the notch and placed against the outer end of the brush to move the inner end of the brush into commutator-engaging position.

Abstract: A brush support combination is provided for dynamo-electric machines in which brushes are continuously urged against a commutator or slip ring. Each brush is carried by a brush arm which is in turn supported on a lead terminal of the machine. The lead terminals may be supported on an open ended motor housing or on an end cap which closes the open ended housing. The brush arm is formed of electrically conductive, flat resilient stock which supports a brush at one end. The other end is formed into a bight, the free end of which projects outwardly. The bight extends through an opening in the lead terminal, entry to which may be achieved through a throat communicating with the opening. In use the bight resiliently engages the edges defining the opening to retain the brush arm and to provide electrical contact with the terminal.

Abstract: In a permanent magnet motor wherein commutator segments have surfaces arranged in a plane perpendicular to the motor shaft for sliding contact with brushes, each brush is made of sheet metal and comprises an inner portion affixed to an end cap of the motor casing, and a substantially annular outer portion united at one of its ends to the inner portion and having an embossed contact on the other end which is resiliently urged into sliding contact with the commutator segment surfaces. The outer brush portion is notched to engage a protuberance on the end cap. A lubricant reservoir is formed either on the commutator or on each brush. The end cap may be locked in position on the motor casing, and the commutator may be mounted on the motor shaft in a predetermined angular position in relation to that of an armature core.

Abstract: A brush cage for an electric motor wherein the brush sets are mounted on two assemblies. One assembly is mounted to the frame and the second assembly is mounted to a removable frame end plate, which when removed, provides access to the first assembly and commutator. Each assembly includes an electrically conductive ring upon which the brushes are mounted. The brushes are electrically interconnected through the ring upon which they are mounted. The rings are in a spaced relation to each other along the commutator rotational axis and are on substantially parallel planes which are perpendicular to that axis. The brushes on one ring fit between the brushes on the other ring so as to be disposed around the commutator in an inter-leafed pattern within the space between the two rings.

Abstract: A brush holder and brush assembly for a dynamoelectric machine is constructed in such a way that the holder can be moulded in one piece of electrical insulating material. The holder has an opening which receives the rotating part of the machine to be contacted by current carrying brushes. The holder includes at least two oppositely disposed brush holding housings each having an end wall remote from the aforesaid opening and being open on two opposite sides thereof. Each housing also has two spaced apart side walls facing each other and extending from the end wall, the end of the housing opposite the end wall being open and opening into the aforementioned opening which receives the rotating part of the machine. Ribs extend inwardly from the side walls of the housings and run between the two ends of the housings. These ribs extend into recesses in the side walls of current carrying brushes that are mounted in the housings with the brushes engaging the side walls of the housings.

Abstract: A battery-powered electric dry shaver comprising an electric motor, two rechargeable batteries, a switch and a printed circuit board, all mounted in a casing. The motor includes conductive brush supports mechanically mounted on said board in direct electrical connection with respective conductive tracks of said board. The batteries are mechanically mounted on said board with their terminals in direct electrical connection with respective conductive tracks of said board. The switch includes a conductive switching element mounted on said board for movement between an "OFF" position and an "ON" position in which the switching element electrically interconnects two of said tracks, whereby to connect said battery terminals to said brush supports through said switching element and said tracks, no flexible conductive leads being employed.

Abstract: A flat miniature dynamoelectric machine comprises a flat rotor with an assembled coreless coil, a commutator having an exposed portion for sliding contact with brushes and integrally carrying the rotor, a shaft on which the commutator is mounted together with the rotor, a housing including bearing means for rotatably supporting and housing the shaft together with the rotor and the commutator mounted thereon, one end of the shaft projecting externally of the housing, a magnet disposed within the housing in opposing relationship with the peripheral surface or end face of the rotor, electrically conductive brushes located within the housing for sliding contact with the exposed portion of the commutator, and a thrust bearing plate mounted on the housing in bearing engagement with the opposite end of the shaft. The thrust bearing plate facilitates close control over the mounting position of the shaft, thereby stabilizing the positional relationship between the various parts.

Abstract: An electric motor frame has a brush-receiving recess beside the commutator. The recess has top and bottom walls and an insulating brush housing is disposed in the recess where it is held in fixed position. Slidable lengthwise in the housing is a brush, between one side of which and the housing there is a stationary metal strip that extends substantially full length of the housing and has an outer end portion extending transversely of the brush. Compressed between this end portion of the strip and the brush is a coil spring that holds the brush against the commutator. An electrical conductor engages the strip, while a flexible wire electrically connects the strip with the brush. The brush housing is provided with at least one exterior rib extending lengthwise of it, and one of the walls of the frame recess has a groove in it that snugly receives the rib to accurately position the housing in the frame.

Abstract: A brush holder assembly which affords ready removal and replacement of brushes is disclosed. The assembly comprises a guideway in a housing for slidably receiving a brush holder, latching means on the guideway and holder to secure the holder with the brush in operating relation in the housing, and means displaceable between the holder and the guideway from outside the housing to unlatch the holder to permit the brush and spring carried thereby to be withdrawn from the housing.