US4361775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current transfer brush
Assignee: Siemens AG
•
Filing: 1981-03-02
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Granted: 1982-11-30
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Expires: 2001-03-02
Abstract
Abstract A current transfer brush with a multiplicity of fibers of graphite which are combined to form a slider member and extend at least approximately perpendicular to the contact surface of the brush, having parts of electrically conductive material, in which the fibers comprise graphite fiber bundles, each of which is twisted with filaments of electrically conductive material giving the advantages of ease of twisting and permitting the ratio of metal to graphite in the brush to be predetermined.
Inventors
- 👤 Heinrich Diepers
- 👤 Horst Musebeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:49
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/18; H01R39/24
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
78 words
A current transfer brush comprising a slider member comprised of a plurality of graphite fiber bundles extending at least approximately perpendicular to the contact surface of the brush, each of said plurality of fiber bundles containing individual filaments of electrically conductive material twisted with said graphite fiber bundles and extending up to said contact surface of said brush, and a frame element retaining only the ends of said bundles facing away from the contact surface of said brush.
Claim 2
Dependent Claim
78 words
A current transfer brush comprising a slider member comprised of a plurality of graphite fiber bundles extending at least approximately perpendicular to the contact surface of the brush, each of said plurality of fiber bundles containing individual filaments of electrically conductive material twisted with said graphite fiber bundles and extending up to said contact surface of said brush, and a frame element retaining only the ends of said bundles facing away from the contact surface of said brush.
Claim 3
Dependent Claim
19 words
A current transfer brush according to claim 1, wherein said graphite fiber bundles are made of highly graphitized graphite.
Claim 4
Dependent Claim
19 words
A current transfer brush according to claim 1, wherein said graphite fiber bundles have a large modulus of elasticity.
Claim 5
Dependent Claim
25 words
A current transfer brush according to claim 3, wherein said graphite fiber bundles have a modulus of elasticity larger than 2×10 11 N/m 2 .
Claim 6
Dependent Claim
27 words
A current transfer brush according to claim 1, wherein said graphite fiber bundles form a core, around which the filaments of the electrically conducting material are wound.
Claim 7
Dependent Claim
42 words
A current transfer brush according to claim 1, wherein said graphite fiber bundles each have at least 100 and at most 5000, and preferably, at most 1000 graphite fibers with a fiber diameter of under 50 μm and preferably, under 10 μm.
Claim 8
Dependent Claim
30 words
A current transfer brush according to claim 1, wherein said filaments are selected from the group consisting of copper, silver and an alloy containing at least one of these materials.
Claim 9
Dependent Claim
29 words
A current transfer brush according to claim 1, wherein said filaments of the electrically conductive material have a filament thickness of under 500 μm and preferably, under 100 μm.
Claim 10
Dependent Claim
31 words
A current transfer brush according to claim 1, wherein said slider member includes graphite fiber bundles twisted with filaments of the electrically conductive material, and graphite fiber bundles without such twisting.
Claim 11
Dependent Claim
31 words
A current transfer brush according to claim 1, whrein said slider member is comprised of a plurality of graphite bundles in which different bundles have a different number of graphite fibers.
Claim 12
Dependent Claim
33 words
A current transfer brush according to claim 1, wherein said slider member is comprised of different graphite fiber bundles having a different number of the filaments of the electrically conductive material twisted therewith.
Claim 13
Dependent Claim
23 words
A current transfer brush according to claim 1, comprising different graphite fiber bundles which are twisted with filaments of different electrically conductive materials.
Claim 14
Dependent Claim
26 words
A current transfer brush according to claim 1, wherein said filaments of the electrically conductive material are enclosed by a layer of a corrosion protection material.
Claim 15
Dependent Claim
16 words
A current transfer brush according to claim 1, wherein said filaments contain a friction reducing material.
Claim 16
Dependent Claim
17 words
A current transfer brush according to claim 1, wherein said filaments contain a high melting point material.
Claim 17
Dependent Claim
31 words
A current transfer brush according to claim 1, and further including a current lead and a conductive adhesive establishing contact between the filaments of electrically conductive material and said current lead.
References Cited (Backward Citations)
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US1548466A
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US1878323A
Cited
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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) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |