Patent US4090161A successfully refreshed from Google Patents.
US4090161A
Expired / Lapsed
US
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Electromagnetic clutch or brake
Assignee: Individual
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Filing: 1976-08-24
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Granted: 1978-05-16
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Expires: 1996-08-24
Abstract
Abstract In electromagnetic clutches or brakes in which the armature closes against the pole pieces of the coil without leaving an air gap, the faces of the poles or armature, or both, are broken up into smaller areas by annular grooves to reduce the lodgement and retention of contaminating and magnetically inhibiting particles resulting from wear.
Inventors
- 👤 Egon Fuhrer
- 👤 Dieter Kleinert
- 👤 Reinhard Haring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:35
CPC Classifications
F; F16; F16D; F16D27/00; F16D27/10; F16D27/108; F16D27/112; F16D55/00; F16D65/00; F16D65/0031; F16D69/00; F16D2069/004; F16D2121/00; F16D2121/18; F16D2121/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
An electro-magnetic control structure comprising an armature having an armature face, a pole ring having an inner pole and an outer pole, said inner and outer poles having inner and outer annular pole faces respectively, each facing said armature face across an air gap, a coil associated with the pole ring for attaching said armature to said pole faces on energization of the coil by creation of a magnetic flux path extending through one of said poles to and directly through the armature and returning through the other of said poles, at least one of said pole and armature faces being split up by at least one annular groove into a plurality of concentric sections on opposite sides of said groove in each of which sections the direction of magnetic flux is the same when the coil is energized.
Claim 2
Dependent Claim
139 words
An electro-magnetic control structure comprising an armature having an armature face, a pole ring having an inner pole and an outer pole, said inner and outer poles having inner and outer annular pole faces respectively, each facing said armature face across an air gap, a coil associated with the pole ring for attaching said armature to said pole faces on energization of the coil by creation of a magnetic flux path extending through one of said poles to and directly through the armature and returning through the other of said poles, at least one of said pole and armature faces being split up by at least one annular groove into a plurality of concentric sections on opposite sides of said groove in each of which sections the direction of magnetic flux is the same when the coil is energized.
Claim 3
Dependent Claim
31 words
An electromagnetic control structure according to claim 1 in which the inner pole face has at least two annular grooves and the outer pole face has at least one annular groove.
Claim 4
Dependent Claim
18 words
An electromagnetic control structure according to claim 1, in which annular grooves are provided in the armature face.
Claim 5
Dependent Claim
24 words
An electromagnetic control structure according to claim 1, in which the at least one annular groove is filled with a mass of plastics material.
Claim 6
Dependent Claim
19 words
An electromagnetic control structure according to claim 1, in which a friction lining is provided between said pole faces.
References Cited (Backward Citations)
US3055475A
Cited
US3712439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |