US4366404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brush assembly for dynamoelectric machines
Assignee: BBC BROWN BOVERI and Co
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Filing: 1981-03-10
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Granted: 1982-12-28
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Expires: 2001-03-10
Abstract
Abstract A brush assembly for electrical machines provided for the transfer of current from a stationary brush holder to a rotating contact part, wherein the stationary supporting structure includes a brush bar (brush magazine) having integrally formed stationary brush boxes in which a brush subassembly having at least one brush carrier element can be slidably mounted. The brushes mounted in the brush carrier element are slidably movable in a direction towards the rotating contact part, and are biased thereagainst by means of a spring, also carried by the brush carrier element. The sub-assembly, including the brush, brush carrier element, and spring, slides into the brush boxes and can be locked in position while being simultaneously electrically connected with the brush boxes. Accordingly, only a brush to be inspected and/or replaced, together with a few additional components, need be separated from the brush holder, while the component which determines the rigidity of the brush assembly is left in rigid connection within the electrical machine during maintenance of the assembly.
Inventors
- 👤 Herwin G. Ziegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:01
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/38; H01R39/40
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
195 words
A brush assembly for dynamoelectric machines provided for the transfer of current from a stationary supporting structure to a rotating contact part, said brush assembly provided with brush boxes which are mechanically and electrically connected with the supporting structure to receive and radially guide plural brushes towards the rotating contact part, wherein the brushes are removable for control and replacement purposes from the stationary supporting structure, while the machine is running and under voltage, comprising: said stationary supporting structure comprising a stationary brush bar having plural integrally formed stationary brush boxes in which respective brushes are to be disposed; a sub-assembly slidable into said brush boxes and including at least one brush carrier element on which is mounted said plural brushes, and means for rigidly moving said brushes in radial direction toward said rotating contact part, including spring means for biasing said brushes against said rotating contact part; locking means for locking said sub-assembly in an operating position within said brush boxes; and means for simultaneously making an electrical connection between said stationary brush bar having said integrally formed brush boxes and said brushes upon sliding and locking of said sub-assembly within said brush boxes.
Claim 2
Dependent Claim
195 words
A brush assembly for dynamoelectric machines provided for the transfer of current from a stationary supporting structure to a rotating contact part, said brush assembly provided with brush boxes which are mechanically and electrically connected with the supporting structure to receive and radially guide plural brushes towards the rotating contact part, wherein the brushes are removable for control and replacement purposes from the stationary supporting structure, while the machine is running and under voltage, comprising: said stationary supporting structure comprising a stationary brush bar having plural integrally formed stationary brush boxes in which respective brushes are to be disposed; a sub-assembly slidable into said brush boxes and including at least one brush carrier element on which is mounted said plural brushes, and means for rigidly moving said brushes in radial direction toward said rotating contact part, including spring means for biasing said brushes against said rotating contact part; locking means for locking said sub-assembly in an operating position within said brush boxes; and means for simultaneously making an electrical connection between said stationary brush bar having said integrally formed brush boxes and said brushes upon sliding and locking of said sub-assembly within said brush boxes.
Claim 3
Dependent Claim
50 words
A brush assembly according to claim 1, wherein the at least one brush carrier element comprises: at least one stop interacting with at least one brush to limit the radial movement of the at least one brush in the plugged-in operating position, as well as in the pulled-out service position.
Claim 4
Dependent Claim
45 words
A brush assembly according to claim 2, wherein the at least one brush comprises: a top fitting which is provided with projections, wherein said projections interact with the at least one stop and simultaneously guide the at least one brush outside the plugged-in operating position.
Claim 5
Dependent Claim
60 words
A brush assembly according to claim 1, comprising: said at least one brush carrier element having the shape of a plate and having an end provided with finger-like projections facing the rotating contact part, with the number of projections corresponding to the number of brushes carried by said brush carrier element, wherein said finger-like projections reach into said brush boxes.
Claim 6
Dependent Claim
25 words
A brush assembly according to claim 4, wherein said brush bar having said integrally formed brush boxes including slots for guiding the brush carrier elements.
Claim 7
Dependent Claim
45 words
A brush assembly according to claim 1, further comprising: said at least one brush carrier element provided with a catch to stop the sub-assembly, with said catch interacting with a cam or a recess arranged on the outside of the at least one brush box.
Claim 8
Dependent Claim
65 words
A brush assembly according to claim 1, further comprising: a plug contact provided for making electrical connection between the at least one brush carrier element and said brush bar having said integrally formed brush boxes, said plug contact including a contact part arranged on the brush carrier element and another integrally connected contact part arranged on the brush bar having said integrally formed brush boxes.
Claim 9
Dependent Claim
47 words
A brush assembly according to claim 1, further comprising: each brush having top fittings which are provided with plural hook-like projections on a side facing the at least one brush carrier element, said at least one brush carrier element having radially running recesses for engaging said projections.
Claim 10
Dependent Claim
39 words
A brush assembly according to claim 8, wherein said radially running recesses have a lower limit which interacts with the projections of the top fittings to serve as a stop for limiting the lift of the brush associated therewith.
Claim 11
Dependent Claim
40 words
A brush assembly according to claim 8, further comprising: a flexible connecting line electrically connecting the brush with the brush carrier element, wherein the length of the flexible connecting lines determines the maximum radial lift of the brush connected thereto.
Claim 12
Dependent Claim
52 words
A brush assembly according to claim 7, further comprising: a top fitting having a side facing the at least one brush carrier element on which side is provided projections for embracing the brush carrier element; and said brush assembly further comprising means for limiting the lift of the at least one brush.
Claim 13
Dependent Claim
38 words
A brush assembly according to claim 11, further comprising: said finger-like projections of said at least one brush carrier element having registration edges which interact with the projections of the top fitting of the at least one brush.
Claim 14
Dependent Claim
86 words
A brush assembly according to claims 4, 11 or 12, wherein said spring means provided for pressing the at least one brush against the rotating contact part comprises: a spring fastened to said brush carrier element by means of a spring carrier element disposed between said spring and said at least one brush carrier element, said spring carrier element extending laterally beyond said at least one brush carrier element and being embraced by the projections of the head fitting attached to said at least one brush.
Claim 15
Dependent Claim
45 words
A brush assembly according to claim 13, further comprising: said spring carrier element provided with a section having a shorter length than the radial height of the projections of said head fitting, and said lateral recesses provided in said section of said spring carrier element;
Claim 16
Dependent Claim
28 words
A brush assembly according to claim 6, wherein said at least one brush carrier element comprises at an end thereof opposite the rotating contact part an insulated handle.
Claim 17
Dependent Claim
42 words
A brush assembly according to claim 15, further comprising: an insulating plate shielding said insulated handle; and said catch for stopping said sub-assembly having an actuating part extending through the insulating plate and electrically insulated thereby at an end thereof manually accessable.
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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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |