US3824416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration-damped brush assembly for use in a small dynamo-electric machine
Assignee: US Philips Corp
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Filing: 1972-09-20
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Granted: 1974-07-16
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Expires: 1992-09-20
Abstract
Abstract A small electric machine, such as a motor or a tachogenerator, which employs a commutator and a brush assembly, in which the undesirable vibrations of the brushes with respect to the commutator are damped by damping means. The preferred damping means comprises amounts of a plastic deformable putty-like damping material, for example on the basis of polyvinylacetate. This material is provided at the locations of the brushes. The damping material adheres both to the brush and to the fixed parts of the machine. To reduce contact noise, plate-shaped brushes having leaf-spring-like brush elements preferably are formed with long parts which are in contact with the damping material. This may be effected with little loss of space by connecting the leaf springs to a brush support via parts which extend on both sides of the leaf springs parallel therewith.
Inventors
- 👤 De Griend J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:03
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/14; H02K5/143; H02K5/145
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
An electric machine provided with a brush assembly which comprises a plurality of brushes which each cooperate with a commutator, in which the respective contact surfaces of the brushes and the cooperating commutator are resiliently urged toward one another, means also being provided for damping vibrations of the contact surfaces with respect to each other, said damping means comprising a plastically deformable putty-like damping material which is interposed between component parts of the brush construction which are subject to vibrations and fixed parts of the machine and which stickingly adheres to these parts.
Claim 2
Dependent Claim
93 words
An electric machine provided with a brush assembly which comprises a plurality of brushes which each cooperate with a commutator, in which the respective contact surfaces of the brushes and the cooperating commutator are resiliently urged toward one another, means also being provided for damping vibrations of the contact surfaces with respect to each other, said damping means comprising a plastically deformable putty-like damping material which is interposed between component parts of the brush construction which are subject to vibrations and fixed parts of the machine and which stickingly adheres to these parts.
Claim 3
Dependent Claim
94 words
An electric machine provided with a brush assembly which comprises a plurality of brushes which each cooperate with slip rings in which the respective contact surfaces of the brushes and the cooperating slip rings are resiliently urged toward one another, means also being provided for damping vibrations of the contact surfaces with respect to each other, said damping means comprising a plastically deformable putty-like damping material which is interposed between component parts of the brush construction which are subject to vibrations and fixed parts of the machine and which stickingly adheres to these parts.
Claim 4
Dependent Claim
94 words
An electric machine provided with a brush assembly which comprises a plurality of brushes which each cooperate with slip rings in which the respective contact surfaces of the brushes and the cooperating slip rings are resiliently urged toward one another, means also being provided for damping vibrations of the contact surfaces with respect to each other, said damping means comprising a plastically deformable putty-like damping material which is interposed between component parts of the brush construction which are subject to vibrations and fixed parts of the machine and which stickingly adheres to these parts.
Claim 5
Dependent Claim
14 words
The machine of claim 1 including a damping material consisting essentially of a polyvinylacetate.
Claim 6
Dependent Claim
206 words
An electric machine comprising a brush assembly which is provided with a plurality of integral brushes made of sheet material which brushes cooperate with a commutator, respective contact surfaces of the brushes and cooperating commutator being resiliently urged toward one another, each of said brushes comprising a plurality of brush elements in the form of leaf springs, said springs at the ends remote from their free ends being connected to a cross part, said cross part having connecting leaf springs arranged on either side for connecting the cross part to the brush support, the connecting leaf springs being located adjacent the brush elements and extending substantially parallel therewith in a direction from the cross part to the free ends of the brush elements and means also being provided for damping vibrations of the contact surfaces of the brush and commutator with respect to each other, said damping means comprising a plastically deformable putty - like damping material which is interposed between component parts of the brush construction which are subject to vibrations and fixed parts of the machine, the damping material making sticking contact with the ends of the brush elements remote from their free ends, with the cross part and with the connecting leaf springs.
Claim 7
Dependent Claim
206 words
An electric machine comprising a brush assembly which is provided with a plurality of integral brushes made of sheet material which brushes cooperate with a commutator, respective contact surfaces of the brushes and cooperating commutator being resiliently urged toward one another, each of said brushes comprising a plurality of brush elements in the form of leaf springs, said springs at the ends remote from their free ends being connected to a cross part, said cross part having connecting leaf springs arranged on either side for connecting the cross part to the brush support, the connecting leaf springs being located adjacent the brush elements and extending substantially parallel therewith in a direction from the cross part to the free ends of the brush elements and means also being provided for damping vibrations of the contact surfaces of the brush and commutator with respect to each other, said damping means comprising a plastically deformable putty - like damping material which is interposed between component parts of the brush construction which are subject to vibrations and fixed parts of the machine, the damping material making sticking contact with the ends of the brush elements remote from their free ends, with the cross part and with the connecting leaf springs.
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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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |