US3742272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark suppressing brush brush holder assembly for rotating machines and sliding contacts
Assignee: General Electric Co
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Filing: 1971-09-10
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Granted: 1973-06-26
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Expires: 1991-09-10
Abstract
Abstract The inclusion of a body of polycrystalline metal oxide varistor material in a brush or brush holder for the suppression of sparking between sliding contacts is disclosed. The body of metal oxide varistor material may form part of a brush contact at a leading or trailing edge thereof or may be the material comprising all, or part of a brush holder in slidable contact with the brush contact and a second contact. Accordingly, the initial electrical connection and, or the final electrical connection, between the brush contact and the other slidable contact is through the varistor material thereby reducing sparking as the sliding contacts make and break connection.
Inventors
- 👤 D Shattuck
- 👤 J Harnden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:26
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/38; H01R39/40; H01R39/18; H01R39/20; H01R39/46; H02; H02K; H02K13/00; H02K13/10
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
58 words
The improved brush-brush holder assembly set forth in claim 1 wherein said body of metal oxide varistor material is a first body forming a portion of said brush along the trailing edge thereof in contact with the commutator and a second body forming a portion of said brush along the leading edge thereof in contact with the commutator.
Claim 2
Dependent Claim
90 words
The improved brush-brush holder assembly set forth in claim 1 wherein said body of metal oxide varistor material comprises a first body spring loaded independently of the spring loading of said brush and retained between the trailing end surface of said brush and an adjacent inner end surface of said brush holder, the indepenent spring loading of said brush and said body of metal oxide varistor material providing compensation for differences in wear rate of the metal oxide varistor material and brush material due to contact with the rotating commutator.
Claim 3
Dependent Claim
51 words
The improved brush-brush holder assembly set forth in claim 3 and further comprising a second body of metal oxide varistor mateiral spring loaded independently of the spring loading of said brush and retained between the leading end surface of said brush and an adjacent inner end surface of said brush holder.
Claim 4
Dependent Claim
25 words
The improved brush-brush holder assembly set forth in claim 3 wherein said first body of metal oxide varistor material is of a generally rectangular shape.
Claim 5
Dependent Claim
50 words
The improved brush-brush holder assembly set forth in claim 1 wherein said brush holder is fabricated of said body of metal oxide varistor material, and including spring means in communication with said brush holder for maintaining a contact pressure of the bottom surface of said brush holder upon the commutator.
Claim 6
Dependent Claim
54 words
The improved brush-brush holder assembly set forth in claim 1 wherein A bottom portion of said brush holder is fabricated of said body of metal oxide varistor material, and including spring means in communication with said brush holder for maintaining a contact pressure of the bottom surface of said brush holder upon the commutator.
Claim 7
Dependent Claim
76 words
The improved brush-brush holder assembly set forth in claim 1 wherein a bottom portion of said brush holder along the trailing end thereof is fabricated of said body of metal oxide varistor material and extends beyond the bottom surface of the remainder of said brush holder, and including spring means in communication with said brush holder for maintaining a contact pressure of the bottom surface of said body of metal oxide varistor material upon the commutator.
Claim 8
Dependent Claim
74 words
The improved brush-brush holder assembly set forth in claim 1 wherein said body of metal oxide varistor material is rigidly attached to an end surface of said brush holder along the trailing edge thereof and extends beyond the bottom surface of said brush holder, and including spring means in communication with said brush holder for maintaining a contact pressure of the bottom surface of said body of metal oxide varistor material upon the commutator.
Claim 9
Dependent Claim
80 words
The improved brush-brush holder assembly set forth in claim 1 wherein said body of metal oxide varistor material is connected across two side walls of said brush holder to form the trailing end thereof, said body of metal oxide varistor material extending beyond the bottom surface of said brush holder, and including spring means in communication with said brush holder for maintaining a contact pressure of the bottom surface of said body of metal oxide varistor material upon the commutator.
Claim 10
Dependent Claim
26 words
The improved brush-brush holder assembly set forth in claim 1 wherein said body of metal oxide varistor material has an alpha exponent in excess of 10.
Claim 11
Dependent Claim
125 words
An improved spark-suppressing brush-brush holder assembly for brush-type electrical machines comprising a spring-loaded brush, a brush holder for retaining said brush in a desired position relative to one or more electrical conductors against which said brush maintains a contact pressure determined by the spring-loading thereof, and a body of metal oxide varistor material forming a portion of said brush along the trailing edge thereof in contact with one of said conductors disposed in the current path between said brush and said conductors when the brush and said conductors part during relative motion between said conductors and brush-brush holder assembly, the body of metal oxide varistor mateiral having nonlinear resistance characteristics which limit the voltage developed across the brush and each conductor when they first part.
Claim 12
Dependent Claim
48 words
The improved brush-brush holder assembly set forth in claim 12 wherein said body of metal oxide varistor material is a first body forming a portion of said brush along the trailing edge thereof and a second body forming a portion of said brush along the leading edge thereof.
Claim 13
Dependent Claim
95 words
The improved brush-brush holder assembly set forth in claim 12 wherein said body of metal oxide varistor material comprises a first body spring loaded independently of the spring loading of said brush and retained between the trailing end surface of said brush and an adjacent inner end surface of said brush holder, the independent spring loading of said brush and said body of metal oxide varistor material providing compensation for differences in wear rate of the metal oxide varistor material and brush material due to the relative motion between said conductors and brush-brush holder assembly.
Claim 14
Dependent Claim
51 words
The improved brush-brush holder assembly set forth in claim 14 and further comprising a second body of metal oxide varistor material spring loaded independently of the spring loading of said brush and retained between the leading end surface of said brush and an adjacent inner end surface of said brush holder.
Claim 15
Dependent Claim
25 words
The improved brush-brush holder assembly set forth iN claim 14 wherein said first body of metal oxide varistor material is of a generally rectangular shape.
Claim 16
Dependent Claim
50 words
The improved brush-brush assembly set forth in claim 12 wherein said brush holder is fabricated of said body of metal oxide varistor material, and including spring means in communication with said brush holder for maintaining a desired contact pressure of the bottom surface of said brush holder upon the conductors.
Claim 17
Dependent Claim
54 words
The improved brush-brush holder assembly set forth in claim 12 wherein a bottom portion of said brush holder is fabricated of said body of metal oxide varistor material, and including spring means in communication with said brush holder for maintaining a contact pressure of the bottom surface of said brush holder upon the conductors.
Claim 18
Dependent Claim
75 words
The imrpoved brush-brush holder assembly set forth in claim 12 wherein a bottom portion of said brush holder along the trailing end thereof is fabricated of said body of metal oxide varistor material and extends beyond the bottom surface of the remainder of said brush holder, and spring means in communication with said brush holder for maintaining a contact pressure of the bottom surface of said body of metal oxide varistor material upon the conductors.
Claim 19
Dependent Claim
73 words
The improved brush-brush holder assembly set forth in claim 12 wherein said body of metal oxide varistor material is rigidly attached to an end surface of said brush holder along the trailing edge thereof and extends beyond the bottom surface of said brush holder, and spring means in communication with said brush holder for maintaining a contact pressure of the bottom surface of said body of metal oxide varistor material upon the conductors.
Claim 20
Dependent Claim
79 words
The improved brush-brush holder assembly set forth in claim 12 wherein said body of metal oxide varistor material is connected across two side walls of said brush holder to form the trailing end thereof, said body of metal oxide varistor material extending beyond the bottom surface of said brush holder, and spring means in communication with said brush holder for maintaining a contact pressure of the bottom surface of said body of metal oxide varistor material upon the conductors.
Claim 21
Dependent Claim
111 words
The improved brush-brush holder assembly set forth in claim 12 wherein said body of metal oxide varistor material has an alpha exponent in excess of 10. 23 An improved electric current collection means comprising first and second electrically conductive members adapted for relative motion between each other and in close proximity to each other for achieving current transfer therebetween, and a body of metal oxide varistor material forming a portion of said first member along a surface which is in close proximity to said second member disposed in conjunction with the current path between said first and second members for improving the current transfer and, or the commutation of the current.
Claim 22
Dependent Claim
32 words
The improved current collection means set forth in claim 23 wherein said body of metal oxide varistor material comprises a first body retained along the trailing end surface of said first member.
Claim 23
Dependent Claim
31 words
The improved current collection means set forth in claim 24 and further comprising a second body of metal oxide varistor material retained along the leading end surface of said first member.
Claim 24
Dependent Claim
25 words
The improved current collection means set forth in claim 24 wherein said first body of metal oxide varistor material is of a generally rectangular shape.
Claim 25
Dependent Claim
50 words
The improved current collection means set forth in claim 23 and further comprising means for retaining said first member in a desired position relative to said second member, a portion of said retaining means in closest proximity to said second member fabricated of said body of metal oxide varistor material.
Claim 26
Dependent Claim
63 words
The improved current collection means set forth in claim 23 and further comprising means for retaining said first member in a desired position relative to said second member, said body of metal oxide varistor material rigidly attached to an end surface of said retaining means along the trailing edge thereof and extending beyond the surface thereof in closest proximity to said second member.
Claim 27
Dependent Claim
26 words
The improved current collection means set forth in claim 23 wherein said body of metal oxide varistor material has an alpha exponent in excess of 10.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |