US4177440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moving-armature electromagnetic device
Assignee: TECHNIQUES EUROPEENNES DE COMMUTATION TEC
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Filing: 1978-07-31
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Granted: 1979-12-04
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Expires: 1998-07-31
Abstract
Abstract The invention relates to a moving-armature electro-magnetic device such as a plunger core electromagnet wherein a ring of a non-magnetic material with an appropriate anti-friction coefficient is placed between the armature and the seat which cooperates with said armature. Said ring permits to reduce to a minimum both the frictional forces and the remanence forces between said armature and said seat.
Inventors
- 👤 Didier Merlette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:28
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1607; H01H; H01H50/00; H01H50/16; H01H50/163
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A moving-armature electromagnetic device comprising: a moveable core; a seat portion engageable by an end of said core to close the magnetic flux lines when the device is energized, said seat portion and said end of said core having complementary tapered surfaces; and a non-magnetic anti-friction ring positioned between said core and said seat to reduce the frictional forces and the magnetic remanence forces between said core and said seat.
Claim 2
Dependent Claim
70 words
A moving-armature electromagnetic device comprising: a moveable core; a seat portion engageable by an end of said core to close the magnetic flux lines when the device is energized, said seat portion and said end of said core having complementary tapered surfaces; and a non-magnetic anti-friction ring positioned between said core and said seat to reduce the frictional forces and the magnetic remanence forces between said core and said seat.
Claim 3
Dependent Claim
16 words
The device as claimed in claim 1, wherein said ring is formed of a non-magnetic metal.
Claim 4
Dependent Claim
14 words
The device as claimed in claim 1, wherein said ring is formed of plastic.
Claim 5
Dependent Claim
14 words
The device as claimed in claim 1, wherein said ring is formed of teflon.
Claim 6
Dependent Claim
19 words
The device as claimed in claim 1, wherein said core and said seat are formed of soft unhardened steel.
Claim 7
Dependent Claim
88 words
A moving-armature electromagnetic device comprising: a moveable core; a seat portion engageable by an end of said core to close the magnetic flux lines when the device is energized, said seat portion and said end of said core having complementary tapered surfaces; an actuator stem extending from said end of said core and passing through an opening in said seat; and a non-magnetic anti-friction ring positioned between said core and said seat to reduce the frictional forces and the magnetic remanence forces between said core and said seat.
Claim 8
Dependent Claim
88 words
A moving-armature electromagnetic device comprising: a moveable core; a seat portion engageable by an end of said core to close the magnetic flux lines when the device is energized, said seat portion and said end of said core having complementary tapered surfaces; an actuator stem extending from said end of said core and passing through an opening in said seat; and a non-magnetic anti-friction ring positioned between said core and said seat to reduce the frictional forces and the magnetic remanence forces between said core and said seat.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |