Patent US3673529A successfully refreshed from Google Patents.
US3673529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic actuator
Assignee: Babcock Electronics Corp
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Filing: 1971-05-13
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Granted: 1972-06-27
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Expires: 1991-05-13
Abstract
Abstract A magnetic actuator, such as is frequently used to control the operation of electrical contacts of electromagnetic relays. The actuator has a pair of permanent magnets which retain a symmetrically-shaped armature in either of two alternative operating positions. An electromagnet is employed to aid the magnetic flux of one of the permanent magnets and to counteract the magnetic flux of the other in determining the position of the bi-stable armature. A common piece or pole is provided for the several permanent magnet circuits, which pole piece can be adjusted with respect to the armature with equal effect upon the flux flow therein.
Inventors
- 👤 Joseph A Garratt
- 👤 Leonard P Ash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:39
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/14; H01H; H01H51/00; H01H51/22; H01H51/2272
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A magnetic actuator comprising in combination, a substantially symmetrical pivotal armature, a pair of magnetic pole pieces positioned substantially equidistant from the pivot axis of said armature on opposIte sides thereof, a permanent magnet for each of said pole pieces, a selectively energizable electromagnet operable between said pole pieces, and an adjustable center pole forming a portion of the magnetic circuit of each of said permanent magnets in close proximity to the pivot axis of said armature.
Claim 2
Dependent Claim
77 words
A magnetic actuator comprising in combination, a substantially symmetrical pivotal armature, a pair of magnetic pole pieces positioned substantially equidistant from the pivot axis of said armature on opposIte sides thereof, a permanent magnet for each of said pole pieces, a selectively energizable electromagnet operable between said pole pieces, and an adjustable center pole forming a portion of the magnetic circuit of each of said permanent magnets in close proximity to the pivot axis of said armature.
Claim 3
Dependent Claim
32 words
A magnetic actuator according to claim 1 wherein said center pole is adjustably movable relative to said armature but with equal effect on the magnetic circuits of both of said permanent magnets.
Claim 4
Dependent Claim
34 words
A magnetic actuator according to claim 1 wherein said armature is formed with a pair of arms which extend oppositely of and normal to the pivot axis thereof to form a substantially symmetrical armature.
Claim 5
Dependent Claim
38 words
A magnetic actuator according to claim 3 wherein said pole pieces are positioned generally on opposite sides of said pivot axis but to one side of said armature for engagement alternatively by the respective arms of said armature.
Claim 6
Dependent Claim
34 words
A magnetic actuator according to claim 4 wherein both of said permanent magnets are between said pole pieces but with each such magnet in magnetic flux conducting relation to only its respective pole pieces.
Claim 7
Dependent Claim
27 words
A magnetic actuator according to claim 5 wherein said electromagnet is operatively positioned between said pole pieces in flux conducting relation with both of said pole pieces.
Claim 8
Dependent Claim
57 words
A magnetic actuator according to claim 6 wherein said center pole is between said permanent magnets in flux conducting relation with each of them and is adjustably movable toward and away from said armature at its pivot axis to thereby vary equally the magnetic paths of said permanent magnets through both of the arms of said armature.
Claim 9
Dependent Claim
39 words
A magnetic actuator according to claim 7 wherein means is provided for securing said center pole in adjusted position relative to said armature to provide a predetermined air gap in the magnetic path of each of said permanent magnets.
Claim 10
Dependent Claim
67 words
A magnetic actuator according to claim 7 wherein said pole pieces, permanent magnets and center pole are aligned substantially normal to the pivot axis of said armature and to one side thereof such that the only air gaps in the circuit of each permanent magnet with its respective arm of said armature is between said arm and center pole and between said arm and respective pole piece.
Claim 11
Dependent Claim
28 words
A magnetic actuator according to claim 9 wherein said actuator is substantially symmetrical about a line through said armature pivot axis and the center of said center pole.
Claim 12
Dependent Claim
35 words
A magnetic actuator according to claim 1 wherein said permanent magnets have different magnetic flux strengths to effectively bias said armature to one of its positions adjacent the appropriate one of said magnetic pole pieces.
Claim 13
Dependent Claim
35 words
A magnetic actuator according to claim 10 wherein said permanent magnets have different magnetic flux strengths to effectively bias said armature to one of its positions adjacent the appropriate one of said magnetic pole pieces.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |