Patent US3710160A successfully refreshed from Google Patents.
US3710160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor brush assembly
Assignee: Dynamics Corp of America
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Filing: 1971-08-12
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Granted: 1973-01-09
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Expires: 1991-08-12
Abstract
Abstract A brush holder assembly for an electric motor wherein during the useful life of the brush a spring wire clip bears against the brush through a slot in the brush housing to improve mechanical rigidity and electrical conductivity. When the brush wears to the extent that it no longer extends beneath the slot, the spring clip extends further down into the slot and obstructs the brush channel thereby preventing further extension of the brush compression spring and its eventual contact with the motor commutator.
Inventors
- 👤 H Voglesonger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:08
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/38; H01R39/40; H01R39/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A brush assembly for an electric motor having a commutator and a stator and comprising: an elongated brush housing having an elongated slot extending at least partially about its periphery at a predetermined location substantially transverse to its axis; an elongated carbon brush slidably mounted within said housing and adapted to extend beneath and obstruct said slot only during its effective life; means comprising a compression spring for urging said brush outwardly through one end of said housing and against said commutator; and means comprising a clip member disposed within said slot to bear against said brush during its useful life, and to extend deeper into said slot and restrict the loNgitudinal travel of said compression spring after termination of the useful life of said brush; said brush and housing being of substantially rectangular crosssection with said slot comprising a mid-portion extending across one side face of said housing and end portions extending part way across the side faces contiguous to said one side face.
Claim 2
Dependent Claim
165 words
A brush assembly for an electric motor having a commutator and a stator and comprising: an elongated brush housing having an elongated slot extending at least partially about its periphery at a predetermined location substantially transverse to its axis; an elongated carbon brush slidably mounted within said housing and adapted to extend beneath and obstruct said slot only during its effective life; means comprising a compression spring for urging said brush outwardly through one end of said housing and against said commutator; and means comprising a clip member disposed within said slot to bear against said brush during its useful life, and to extend deeper into said slot and restrict the loNgitudinal travel of said compression spring after termination of the useful life of said brush; said brush and housing being of substantially rectangular crosssection with said slot comprising a mid-portion extending across one side face of said housing and end portions extending part way across the side faces contiguous to said one side face.
Claim 3
Dependent Claim
34 words
A brush assembly as described in claim 1, wherein clip member is a spring wire clip adapted to extend across the other end of said housing to prevent said compression spring from extending therethrough.
Claim 4
Dependent Claim
150 words
A brush assembly for an electric motor having a commutator, a stator and an electric brush for establishing electrical continuity therebetween, comprising an elongated brush housing defining a channel for said brush including a transverse deep slot through at least one side thereof, spring means for urging said brush along said channel past said slot and through one end of said housing into contact with said commutator, and means including a clip member reciprocable in said slot and urged to bear slidably upon the wall of said brush as the brush wears at its commutator contacting end, said slot being substantially deeper than the wall of the brush in a cross-sectional direction for said clip member to move a substantial distance deeper in said slot to interlock with and arrest said spring means and its action when said brush wears a predetermined amount and clears contact with said clip member.
Claim 5
Dependent Claim
150 words
A brush assembly for an electric motor having a commutator, a stator and an electric brush for establishing electrical continuity therebetween, comprising an elongated brush housing defining a channel for said brush including a transverse deep slot through at least one side thereof, spring means for urging said brush along said channel past said slot and through one end of said housing into contact with said commutator, and means including a clip member reciprocable in said slot and urged to bear slidably upon the wall of said brush as the brush wears at its commutator contacting end, said slot being substantially deeper than the wall of the brush in a cross-sectional direction for said clip member to move a substantial distance deeper in said slot to interlock with and arrest said spring means and its action when said brush wears a predetermined amount and clears contact with said clip member.
Claim 6
Dependent Claim
17 words
A brush assembly as described in claim 3 wherein said clip member comprises a spring wire clip.
Claim 7
Dependent Claim
48 words
A brush assembly as described in claim 3 wherein said spring means comprise a helical compression spring and said clip member extends through said slot and between adjacent coils of said spring to prevent further urging of said brush after said brush has worn beyond said predetermined point.
Claim 8
Dependent Claim
62 words
A brush assembly as described in claim 3, wherein said brush and said housing are of substantially rectangular cross-section and wherein said slot comprises a first portion extending part way across a side face of said housing, a second portion extending across the top of said housing, and a third portion extending part way across the other side face of said housing.
Claim 9
Dependent Claim
34 words
A brush assembly as described in claim 6, wherein said third portion is complementary to said first portion and the plane of said slot is perpendicular to the longitudinal axis of said brush housing.
Claim 10
Dependent Claim
47 words
A brush assembly as described in claim 3, wherein said brush has a groove cut across at least partially about its periphery at a predetermined location, such that said groove lies beneath said slot and receives said clip when said brush is moved to a retracted position.
Claim 11
Dependent Claim
33 words
A brush assembly as described in claim 3, wherein said spring wire clip member is adapted to extend across the other end of said housing to prevent said compression spring from extending therethrough.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |