Brush mechanism

Claim 2

A dynamoelectric machine comprising a stationary structure, a rotor rotatably mounted within the stationary structure, and a commutator mounted on the rotor; and a brush mechanism comprising a mounting plate, a plurality of brushes for engaging the peripheral surface of the commutator at spaced apart positions and freely movable radially toward the axis of rotation of the rotor, termination means for electrical interconnection with at least one of the brushes, a brush shunt coNnected to each one of the brushes and with at least one of the brush shunts being electrically connected by connector means to the termination means, a brush holder supporting each brush; a spring for urging each brush against the commutator, and means for fixedly securing each brush holder to the mounting plate whereby each of the brush holders establish a channel along which a brush is freely slidable, the brush holders each having walls defining at least part of the channel for slidingly receiving the associated brush, said walls having a preselected thickness, a first slot formed in each brush holder for accommodating a brush shunt, a second slot in each brush holder for accommodating a brush biasing spring, and each brush holder comprising a formed one piece steel stamping thereby to permit the arrangement of enlarged first and second slots for the preselected thickness of the walls of the channel.

Claim 3

The structure of claim 1 wherein the means for fixedly securing each brush holder includes a terminal for electrically connecting the brush to a power lead external of the machine and for securing the brush mechanism to the stationary structure, and said means for fixedly securing each brush holder further comprise an irregular surface on the mounting plate that interfits with the brush holder and prevents distortion of the brush holder when a torque is applied thereto.

Claim 4

A dynamoelectric machine comprising a stationary structure; a rotor rotatably mounted within the stationary structure, and a commutator mounted on the rotor; and a brush mechanism comprising a yoke, a plurality of brushes for engaging the peripheral surface of the commutator at spaced apart positions and freely movable radially toward the axis of rotation of the rotor, termination means for electrical interconnection with at least one brush, brush shunts electrically connected to each brush and at least one of the brush shunts being electrically connected by connector means to the termination means, a brush holder supporting each brush, a spring for urging each brush against the commutator, and means for fixedly securing each brush holder to the yoke whereby each of the brush holders establish a channel along which a brush is freely slidable, the brush holders each defining walls of the channel having a preselected thickness for slidingly receiving the associated brush, a first slot accommodating a brush conductor connected to the associated brush, and a second slot for accommodating a brush biasing spring, said means for fixedly securing each brush holder including a terminal for electrically connecting the brush to a power lead external of the machine and for securing the brush mechanism to the stationary structure, and further including an irregular mounting surface on the mounting plate that interfits with the brush holder and prevents distortion of the brush holder when a torque is applied thereto.

Claim 5

A dynamoelectric machine comprising a stationary structure; a rotor rotatably mounted within the stationary structure, and a commutator mounted on the rotor; and a brush mechanism comprising a yoke, a plurality of brushes for engaging the peripheral surface of the commutator at spaced apart positions and freely movable radially toward the axis of rotation of the rotor, termination means for electrical interconnection with at least one brush, brush shunts electrically connected to each brush and at least one of the brush shunts being electrically connected by connector means to the termination means, a brush holder supporting each brush, a spring for urging each brush against the commutator, and means for fixedly securing each brush holder to the yoke whereby each of the brush holders establish a channel along which a brush is freely slidable, the brush holders each defining walls of the channel having a preselected thickness for slidingly receiving the associated brush, a first slot accommodating a brush conductor connected to the associated brush, and a second slot for accommodating a brush biasing spring, said means for fixedly securing each brush holder including a terminal for electrically connecting the brush to a power lead external of the machine and for securing the brush mechanism to the stationary structure, and further including an irregular mounting surface on the mounting plate that interfits with the brush holder and prevents distortion of the brush holder when a torque is applied thereto.

Claim 6

The structure of claim 1 wherein the brush mechanism further comprises a pair of substantially similar solid crossover members, each of said crossover members electrically interconnecting a different pair of brushes.

Claim 7

The structure of claim 4, wherein each crossover member includes a generally planar central arm section and means for locating a terminal member relative to the plane of the central arm section at different preselected distances, whereby a single crossover blank may be used to form distinguishable crossover members.

Claim 8

The structure of claim 4 wherein said mounting plate comprises an insulative yoke including means for positioning each said crossover member relative thereto, each said crossover member including a tab cooperatively associated with said positioning means for locating the position of said crossover members with respect to said yoke.

Claim 9

A brush mechanism for a dynamoelectric machine; said mechanism comprising: an insulative yoke; at least two brushes supported at spaced apart positions on the yoke and freely slidable in a predetermined direction relative Thereto; termination means for electrical connection with at least one brush; a brush shunt connected to each brush with at least one of the brush shunts being connected by connector means to the termination means; a brush holder supporting each brush; a spring for urging each brush in the predetermined direction; and means for fixedly securing each brush holder to the yoke whereby each of the brush holders establish a channel along which a brush is freely slidable; the brush holders each defining walls, having a preselected thickness, of the channel for slidingly receiving the associated brush; a first slot formed in one of the walls for accommodating a brush shunt connected to the associated brush, and a second slot for accommodating a brush biasing spring, and each brush holder comprising a formed one piece steel stamping thereby to permit the arrangement of enlarged first and second slots for the preselected thickness of the walls of the channel.

Claim 10

A brush mechanism for a dynamoelectric machine; said mechanism comprising: an insulative yoke; at least two brushes supported at spaced apart positions on the yoke and freely slidable in a predetermined direction relative Thereto; termination means for electrical connection with at least one brush; a brush shunt connected to each brush with at least one of the brush shunts being connected by connector means to the termination means; a brush holder supporting each brush; a spring for urging each brush in the predetermined direction; and means for fixedly securing each brush holder to the yoke whereby each of the brush holders establish a channel along which a brush is freely slidable; the brush holders each defining walls, having a preselected thickness, of the channel for slidingly receiving the associated brush; a first slot formed in one of the walls for accommodating a brush shunt connected to the associated brush, and a second slot for accommodating a brush biasing spring, and each brush holder comprising a formed one piece steel stamping thereby to permit the arrangement of enlarged first and second slots for the preselected thickness of the walls of the channel.

Claim 11

The brush mechanism as set forth in claim 7 wherein the yoke comprises at least one post formed in the yoke.

Claim 12

The brush mechanism as set forth in claim 7 wherein a plurality of prepositioned brush holder mounting holes are provided in the yoke for positioning the holders on the yoke.

Claim 13

The brush mechanism as set forth in claim 7 wherein said brush holder is provided with a rust resistant coating.

Claim 14

The brush mechanism as set forth in claim 7 including at least four radially spaced brush holders supporting two sets of oppositely facing brushes, means for electrically interconnecting the brushes of each set, each of said means comprising a solid crossover conductor, a first tab on said crossover conductor for supporting a terminal stud and a second tab on said crossover conductor for locating said crossover conductor with respect to said yoke, said first tab including means for selectively positioning a conductive terminal stud relative to the crossover conductor.