A power tool includes a brush holder with a brush positioned more accurately with respect to a commutator. A grinder as a power tool includes a housing, a stator fixed to the housing, a rotor rotatable relative to the stator and including a commutator and a coil, a brush that comes in contact with the commutator, a brush-holding metal plate having a screw hole and holding the brush, and a screw extending through the screw hole and directly fastened to the housing.

Brush holder for electric traction motors for locomotives, included in the electrical field, refers to an improvement applied to a brush holder, used in electric traction motors for locomotives, which electric coupling device is especially adapted to sustain, support and press the brush over a commuter of an electric motor rotor, while its body is connected to electric connections, being said device structurally sustained by means of isolated shafts which are connected to the locomotive structure.

A holding apparatus for a slip ring unit includes at least two slots configured for receiving slip ring brushes respectively, with the at least two slots being arranged in spaced-apart relationship. A cooling duct is arranged between the at least two slots for cooling a side surface of the slip ring brushes. The cooling duct is configured as a third slot between the at least two slots, with the at least two slots and the cooling duct being of essentially identical shape and dimension.

A system for transferring current between a rotating element and a fixed element, comprising—a support in the general shape of a sheet (10) comprising a conductive portion (11) electrically connected to the fixed element—a brush holder (20) mounted on the support (10) and supporting a brush (30) that is pushed into contact against the rotating element—electrical connection means (42) for connecting the conductive portion (11) of the support to a cable (40) that is joined to the brush (30), wherein a resistive element (12) is situated between the brush (30) and the conductive portion (11) of the support (10) and prevents current from flowing directly between the conductive portion and the brush.

Brush holder for electric traction motors for locomotives, included in the electrical field, refers to an improvement applied to a brush holder, used in electric traction motors for locomotives, which electric coupling device is especially adapted to sustain, support and press the brush over a commuter of an electric motor rotor, while its body is connected to electric connections, being said device structurally sustained by means of isolated shafts which are connected to the locomotive structure.

This motor includes a yoke, an armature, a brush holder and a ground member. The yoke has the shape of a bottomed cylinder that has an inner surface to which a magnet is affixed. The armature is contained within the yoke. The brush holder is arranged in an opening of the yoke, and holds a feed brush for supplying an electric current to the armature, and a bearing that axially supports a rotary shaft of the armature. The ground member is in contact with the bearing and the yoke. The ground member is affixed to a ground terminal that is held by the brush holder.

A motor brush quick change assembly that includes brush units and electrical spring contacts. The brush units include a carrier with a housing and a brush. The electrical spring contacts are connected to an electrical device. Each of the brush units is configured to be removably attached to the electrical device to contact one of the electrical spring contacts. The brush unit thus provide for both a mechanical and electrical connection to the electrical device. The brush units are configured to prevent the need for separate electrical leads that require separate attachment and detachment to the electrical device. This design provides for straight-forward removal and replacement that can be performed by a robotic device or an operator.

A grounding brush includes a wire extending along an arc, a plurality of conductive fibers each bent into a U-shape around the wire, and at least one support including a channel crimped about the fibers and wire to secure them to the channel. An assembly includes a mounting plate having an opening configured to surround a rotatable motor shaft having an axis of rotation, a plurality of tabs disposed in a circle around the periphery, each of the tabs extending axially from the first side of the mounting plate and radially toward the axis of rotation to define with an adjacent portion of the first side of the mounting plate a U-shaped bracket and a grounding brush mounted in the plurality of U-shaped brackets with the conductive fibers extending radially inward or outward. Also a method of mounting and adjusting the grounding brush in the assembly.

A grounding brush assembly includes a plurality of conductive fibers extending from at least one support, a mounting plate having a first side and a second side and an opening configured to surround a rotatable motor shaft having an axis of rotation, and a plurality of tabs disposed in a circle around the periphery. Each of the tabs extends axially from the first side of the mounting plate and radially toward or away from the axis of rotation to define with an adjacent portion of the first side of the mounting plate a U-shaped bracket. The at least one support is secured against the first side of the mounting plate by the plurality of tabs.

A brush assembly for transmitting electrical power to a rotating component includes one or more electrically conductive brushes, a housing configured to receive the one or more brushes and hold the one or more brushes in alignment with an opposing surface, and one or more brush carriers. Each carrier is configured to receive and clip onto a respective brush such that each of the one or more brushes can be removed from its respective carrier by unclipping the carrier from the brush.