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US4121124A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrodynamic force generator

Assignee: Individual
•
Filing: 1976-07-26
•
Granted: 1978-10-17
•
Expires: 1996-07-26
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Abstract

Abstract An electrodynamic force generator or vibrator employing plural ring permanent magnets and a round magnetic structure of the center gap type that is split on a horizontal plane passing through the center and a support and guidance system for supporting the vibratory table and coil consisting of a plurality of horizontal damped cantilever springs joined to "C" shaped damped compensating springs. Typically, a round drive coil of plural turns surrounds a central core or pole of the magnetic structure and is influenced by flux on all sides. Shorted turn coils surround the drive coil and are stationary upon the outer pole to provide reduction of inductance. The drive coil is attached to a table structure which is supported and guided in the magnet structure. The support and guidance system for the table and drive coil of the force generator consists of three or more sets of horizontal damped cantilever springs joined to a like number of "C" shaped essentially vertical damped springs which compensate for the shortening effect of the horizontal spring during long excursion of the table of the force generator.

Inventors

  • 👤 Frederick C. Hunt

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 15:40
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/18

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 188 words
A center gap permanent magnet electrodynamic force generator comprising upper and bottom annular permanent magnet sections, the upper section comprising a top plate, an outer pole plate, a center pole and at least one ring magnet interposed between the top plate and the outer pole plate, the bottom section comprising a bottom plate, a center pole, an outer pole plate and at least one ring magnet interposed between the bottom plate and the outer pole plate, said sections being separately magnetized as a sub-assembly prior to the assembly thereof in the complete generator, said sub-assemblies being assembled as a unitary generator structure on a single axis with the outer pole plate of each said sub-assembly abutting each other to form a split center plate for said structure so as to provide a maximum flux density for the magnet material used, the magnetic field through the magnets of each sub-assembly being parallel to the axis of said structure and in opposition to each other, said structure being cylindrical and provided with a center air gap inwardly adjacent said center plate, and a table structure positioned in said air gap.
Claim 2
Dependent Claim 188 words
A center gap permanent magnet electrodynamic force generator comprising upper and bottom annular permanent magnet sections, the upper section comprising a top plate, an outer pole plate, a center pole and at least one ring magnet interposed between the top plate and the outer pole plate, the bottom section comprising a bottom plate, a center pole, an outer pole plate and at least one ring magnet interposed between the bottom plate and the outer pole plate, said sections being separately magnetized as a sub-assembly prior to the assembly thereof in the complete generator, said sub-assemblies being assembled as a unitary generator structure on a single axis with the outer pole plate of each said sub-assembly abutting each other to form a split center plate for said structure so as to provide a maximum flux density for the magnet material used, the magnetic field through the magnets of each sub-assembly being parallel to the axis of said structure and in opposition to each other, said structure being cylindrical and provided with a center air gap inwardly adjacent said center plate, and a table structure positioned in said air gap.
Claim 3
Dependent Claim 32 words
A center gap permanent magnet structure as defined in claim 1 and wherein each annular section is provided with a shorted turn coil located at the peripheral edge of the center gap.
Claim 4
Dependent Claim 22 words
A center gap permanent magnet structure as defined in claim 1 and wherein each annular section includes at least one ring magnet.
Claim 5
Dependent Claim 67 words
A center gap permanent magnet structure as defined in claim 1 and wherein the support and guidance system for the table and drive coil consists of a plurality of sets of horizontal damped cantilever springs joined to a like number of "C" shaped essentially vertical damped springs which compensate for the shortening effect of the horizontal spring during long excursion of the table of the force generator.

References Cited (Backward Citations)

GB682667A Cited
US2798972A Cited
US3075100A Cited
US3106653A Cited
FR1390231A Cited
US3417268A Cited
US3896319A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-10-16 1982-04-17 1982-10-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-10-16 1986-04-17 1986-10-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-10-16 1990-04-17 1990-10-17 $7700.00 Window Closed / Lapsed

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