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US4581597A Expired / Lapsed US ⏱️ 0.0 years remaining

Electromagnetic actuator

Assignee: Scott Technologies Inc
•
Filing: 1984-01-13
•
Granted: 1986-04-08
•
Expires: 2004-01-13
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Abstract

Abstract An electromagnetic actuator is presented wherein a pair of permanent magnets are sandwiched between respective pairs of pole pieces. The pole pieces communicate with an armature to effect the state of actuation of the actuator. A pair of electromagnets, consisting of a wire-wound core, is maintained in close relationship to the pair of permanent magnets, a pole piece separating each permanent magnet from its associated electromagnet. When the electromagnets are not energized, the permanent magnets create a magnetic circuit which pulls the armature into a touch position with one pole piece of each permanent magnet. When the electromagnets are energized, a magnetic field is created which opposes and effectively cancels the magnetic fields of the permanent magnets, creating another magnetic circuit drawing the armature into a touch position with the other pole pieces. When the electromagnets are not energized, the armature is held in a first position by the permanent magnets alone. When energized, the holding power is achieved by the electromagnets, and the permanent magnets are effectively removed from the system.

Inventors

  • 👤 Omar C. Walley

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 22:32
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/01

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 171 words
An electromagnetic actuator, comprising: a first permanent magnet maintained between first and second pole pieces; a second permanent magnet maintained between third and fourth pole pieces; an armature in juxtaposition to pole faces on each end of said pole pieces; means in communication with said armature for selectively engaging said armature with the pole faces of said first and third or second and fourth pole pieces, said means comprising first and second cores having first and second coils wound thereabout, said first coil communicating with said second and fourth pole pieces; the magnetic field generated by said first and second cores and said first and second coils opposing the magnetic field of said first and second coils opposing the magnetic field of said first and second permanent magnets; a yoke interconnecting said first and second cores; and wherein said armature is a balanced armature maintained upon a pivot pin between said pole faces of said pole pieces, all of said pole faces being positioned on the same side of said armature.
Claim 2
Dependent Claim 171 words
An electromagnetic actuator, comprising: a first permanent magnet maintained between first and second pole pieces; a second permanent magnet maintained between third and fourth pole pieces; an armature in juxtaposition to pole faces on each end of said pole pieces; means in communication with said armature for selectively engaging said armature with the pole faces of said first and third or second and fourth pole pieces, said means comprising first and second cores having first and second coils wound thereabout, said first coil communicating with said second and fourth pole pieces; the magnetic field generated by said first and second cores and said first and second coils opposing the magnetic field of said first and second coils opposing the magnetic field of said first and second permanent magnets; a yoke interconnecting said first and second cores; and wherein said armature is a balanced armature maintained upon a pivot pin between said pole faces of said pole pieces, all of said pole faces being positioned on the same side of said armature.
Claim 3
Dependent Claim 48 words
The electromagnetic actuator according to claim 1 wherein a first magnetic circuit is defined from said first permanent magnet, through said second pole piece, first core, yoke, second core, fourth pole piece, second permanent magnet, third pole piece, armature, first pole piece, and return to said first magnet.
Claim 4
Dependent Claim 40 words
The electromagnetic actuator according to claim 2 wherein application of current to said coils defines a second magnetic circuit through said first core, yoke, second core, fourth pole piece, armature, second pole piece, and thence returned to said first core.
Claim 5
Dependent Claim 28 words
The electromagnetic actuator according to claim 3 wherein activation of said first magnetic circuit defines an air gap between said armature and said first and third pole pieces.
Claim 6
Dependent Claim 28 words
The electromagnetic actuator according to claim 3 wherein actuation of said second magnetic circuit defines an air gap between said armature and said second and fourth pole pieces.

References Cited (Backward Citations)

GB769778A Cited
US3253095A Cited
US3525958A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-04-07 1989-10-07 1990-04-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-04-07 1993-10-07 1994-04-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-04-07 1997-10-07 1998-04-08 $7700.00 Window Closed / Lapsed

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