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Publication numberUS3257586 A
Publication typeGrant
Publication dateJun 21, 1966
Filing dateMar 2, 1961
Priority dateMar 3, 1960
Also published asDE1172384B
Publication numberUS 3257586 A, US 3257586A, US-A-3257586, US3257586 A, US3257586A
InventorsErich Steingroever
Original AssigneeMagnetfabrik Bonn Gewerkschaft
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Flexible permanent magnet and composition
US 3257586 A
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Description  (OCR text may contain errors)

June 1966 E. STEINGROEVER 3, 57,5 6

FLEXIBLE PERMANENT MAGNET AND COMPOSITION Filed March 2, 1961 I VENTOR N Ema/ STEINGROEVER United States Patent Office 3,257,586 Patented June 21, 1966 3 Claims. oi. 317-1ss) The invention relates to magnetic compositions prepared from permanently magnetic powders and a nonmagnetic binder.

Magnetic compositions of this type may be compressed into magnets or processed to instance by cementing.

I have found a particularly simple procedure for the manufacture of permanent magnets which are provided with magnetically soft conducting pieces.

Both parts are first sprayed separately as bands or profiles, or rolled to slabs (sheets), and then joined by rolling upon each other, cementing, pressing together, or similar treatments. The resulting laminated bands or profiles can be directly employed asadhesiv molding strips.

Laminated sheets of substantial width may be divided into such bands. The magnetizing of such adhesive moldings is carried out in an arc form so that the adhering surface has a magnetic north and south pole.

Suitable permanent magnetic materials ar compounds of the type BaO-6Fe O and alloys known under the names Alni and Alnico, which have the following composition:

Alni, Alnico,

-10 Fe balance balance and contain powdered permanently magnetic compositions of the type BaO-Fe O The particles of said magnetic materials are magnetically anisotropic and have the netic value of the material could not be fully utilized.

According to the present invention, such a sheet or slab, is joined to a return piece 2, which has been made similarly to piece 1, but contains soft magnetic iron powder instead of a permanently magnetic powder.

ably increased.

Instead of using BaO-6Fe O particles as permanent SrO-6Fe O and PbO-6Fe O can mixture with each other.

As nonmagnetic binders, any thermoplastic resin such as homopolymers or copolymers or vinyl chloride, polyamides, cellulose acetate, also natural or synthetic rubbers may be used. I prefer to employ polyethylene.

I claim:

References Cited by the Examiner UNITED STATES PATENTS 2,627,097 2/1953 Ellis 3l7159 2,698,917 1/1955 Van Urk et al 317-201 2,797,370 6/1957 Bennett 317-158 2,892,248 6/1959 Weber et al 29l55.6 2,900,344 8/1959 Stuyts et a] 317201 2,932,545 4/1960 Foley 317-201 X 2,959,832 11/1960 Baermann 317-158 2,965,953 12/1960 Baermann 29-155.6

BERNARD A. GILHEANY, Primary Examiner.


G. HARRIS, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2627097 *May 25, 1951Feb 3, 1953Ellis RobertFlexible magnetic closure
US2698917 *Jan 4, 1952Jan 4, 1955Hartford Nat Bank & Trust CoMagnetic circuit comprising a ferromagnetic part having high permeability and a substantially flat, thin permanent magnet
US2797370 *Nov 1, 1954Jun 25, 1957Rutherford A BennettMagnetic tape for lifting boxes or bags and other objects
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US2965953 *Feb 5, 1954Dec 27, 1960Baermann MaxMethod of producing permanent magnets
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3355209 *May 10, 1965Nov 28, 1967Magnetic Devices IncMaterial handling device
US3407507 *Apr 10, 1967Oct 29, 1968Reginald L. BrubakerMeasuring instrument
US3408573 *Jun 8, 1966Oct 29, 1968Philips CorpCoil core manufactured from softmagnetic and permanent-magnetic materials
US3460248 *Feb 26, 1968Aug 12, 1969Tate Clarence RMethod for making micromagnets
US3464134 *Jun 22, 1966Sep 2, 1969Schenley Ind IncMagnetic display
US3784945 *Feb 7, 1973Jan 8, 1974M BaermannPermanent magnet for suspension bearings
US4004167 *Jan 29, 1975Jan 18, 1977Magna Motors CorporationPermanent magnet stators
US4105054 *Feb 11, 1977Aug 8, 1978Atlantic Richfield CompanyMagnets
US4184398 *Jul 6, 1976Jan 22, 1980Abe SiegelmanSelf generating electrical pickup for musical instruments
US4186609 *Feb 27, 1978Feb 5, 1980Max BaermannEddy-current device for measuring rotational speed
US4187453 *May 11, 1976Feb 5, 1980Jim ZegeerElectric motor drive system
US4484682 *Jun 6, 1983Nov 27, 1984Crow Robert TContainer with magnet for holding it in position
US4701721 *Sep 11, 1986Oct 20, 1987American Telephone And Telegraph Company, At&T Bell LaboratoriesCore formed of hard and soft magnetic materials for an electrical relay apparatus
US4879338 *Feb 13, 1985Nov 7, 1989Raychem CorporationBlend with polyphenylene ether
US5047743 *Mar 28, 1989Sep 10, 1991Scesney Stanley PIntegrated magnetic element
US5114517 *Feb 9, 1990May 19, 1992Schonstedt Instrument CompanyMethods, apparatus and devices relating to magnetic markers for elongated hidden objects
US5173139 *Feb 12, 1992Dec 22, 1992Schonstedt Instrument CompanyMethod for providing magnetic markers on elongated hidden objects
US5204571 *May 22, 1991Apr 20, 1993Matsushita Electric Industrial Co., Ltd.Miniature electric motor with rubber stator magnet
US5206065 *Feb 12, 1992Apr 27, 1993Schonstedt Instrument CompanyMethods, apparatus and devices relating to magnetic markers for elongated hidden objects
US5280991 *Feb 26, 1993Jan 25, 1994Prince CorporationFor the roof of a vehicle
US20110031431 *Aug 4, 2009Feb 10, 2011The Boeing CompanyMagnetic composite structures with high mechanical strength
EP0065141A1 *Apr 28, 1982Nov 24, 1982General Electric CompanyApparatus for x-ray examination of a body
EP0080160A1 *Nov 18, 1982Jun 1, 1983The B.F. GOODRICH CompanyPermanent magnets
WO1996037868A1 *May 24, 1996Nov 28, 1996Benoit BallandAnti-theft magnetic tag and ink
U.S. Classification335/303
International ClassificationH01F7/02, H01F1/00, H01F1/032, H01F1/117
Cooperative ClassificationH01F1/117, H01F7/0215, H01F1/0027
European ClassificationH01F1/117, H01F1/00D, H01F7/02A1A