US3899762A - Permanent magnetic structure - Google Patents

Permanent magnetic structure Download PDF

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US3899762A
US3899762A US511681A US51168174A US3899762A US 3899762 A US3899762 A US 3899762A US 511681 A US511681 A US 511681A US 51168174 A US51168174 A US 51168174A US 3899762 A US3899762 A US 3899762A
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magnetic
sleeve
core
pole
assembly
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US511681A
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Robert J Studders
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PERMAG MAGNETICS CORP
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PERMAG MAGNETICS CORP
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/021—Construction of PM
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/0221—Mounting means for PM, supporting, coating, encapsulating PM

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  • a permanent magnet structure of this invention is primarily an improvement on the permanent magnets embedded in the plastic cover for the memory disk of a mini-computer, such as shown in Crouch et al. US. Pat. No. 3,635,608 issued Jan. 18, 1972, namely the permanent magnets 5 shown in FIGS. 1B and 2 therein.
  • Previously such permanent magnets have generally comprised magnetic cups into which a central cylindrical permanent magnet was seated equally spaced from the cylindrical sides of the cup by a non-magnetic material.
  • the outsides of these cups were roughened, grooved, or notched to insure their anchorage in the plastic cover, and the outer exposed pole surfaces of these magnets at the open end of the cups were usually highly polished and then plated to prevent their corrosion. This plating often chipped off producing particles that caused errors when they got on the magnetic memory disks.
  • the magnets used for these computer memory disk covers are noncorrosive and have a high strength so as to hold the cover on the package against the hub of the memory disk, in order to prevent all dirt and dust from entering the package during both use and storage of the memory disk. Since the pull of each of these permanent magnets is about 12 lbs., a leverage arrangement is connected to the handle 8 (see FIGS. 1A and 1B of said patent) for breaking the almost 50 lb. force of the four permanent magnets 5 that hold the cover on the package. Because of the precision required in making these cupshaped holding magnets, that is the machining and fitting of their component parts, they are quite expensive.
  • the structure of the permanent magnet of this invention comprises a non-corrosive central magnetic core surrounded by two snuggly concentric standard size stainless steel tubes, the inner one non-magnetic and the outer one magnetic, and a magnetic disk pole piece at one end of the assembly whose periphery extends beyond that of the outer tube.
  • One end edge of the central permanent magnetic core may be chamfered or bevelled to aid its force fitting inside of the inner tube.
  • Both of the tubes are of the same length with their ends aligned in parallel planes.
  • the pole piece or disk which is held magnetically and axially of the core against one end of of the core and tubes has a circumference slightly larger than the circumference of the outer tube to prevent the assembly from pulling from the plastic base or mass into which it is cast, embedded or molded.
  • this button type permanent magnet assembly as explained above, namely as a holder for the cover for the memory disk of a mini-computer, the other and exposed polar end of the embedded assembly is ground and polished flush with the other adjacent embedded magnets in the cover so as to form a smooth, intimate and direct contact with the magnetic hub of the memory disk.
  • the core, the surrounding tubes, and the pole plate are all cylindrical.
  • the permanent magnetic core may be cut from a standard size bar of an alloy containing aluminum, nickel, cobalt, titanium, copper, and iron, such as Alnico 6 or 8.
  • the inner sleeve may be cut from a standard size austenitic steel tube, such as of stainless steel No. 304, and the other sleeve may be cut from a larger standard size martensitic steel tube such as of stainless steel No. 410.
  • Another object is to produce such a magnet from lengths cut from standard stainless steel tubes and bar stock, and a soft iron plate, thereby avoiding as much machining of the parts as possible.
  • FIG. I is a perspective view of the inside of a cover for the memory disk of a mini-computer showing four button shaped permanent magnets molded therein, with part of one of the magnets and adjacent cover being broken away;
  • FIG. II is an enlarged vertical sectional view of one of the magnets shown in FIG. I.
  • FIG. III is an enlarged perspective exploded view of the parts of the magnet shown in FIG. II.
  • FIG. I there is shown, for example, a plastic cover C for a mini-computer memory disk package, such as that shown in the above mentioned Crouch et al. patent, having four equally spaced permanent magnet assemblies 10 with all but one polar end of each magnetic assembly embedded in the plastic of the cover C.
  • the plastic cover C is provided with supporting projections or bases B for surrounding the sides of the permanent magnet assemblies 10.
  • the cast plastic material of the cover C preferably is very durable and non-magnetic, such as a polycarbonate organic plastic like Lexan.
  • the assembled permanent magnet 10 comprises a central core or permanent magnet 12 surrounded by a press fit non-magnetic inner sleeve 14 and then by an outer magnetic sleeve 16.
  • the one pole end or surface 13 of the core 12 may have its outer peripheral edge or comer bevelled at 15 so that it may be pressed fit more easily into the inner sleeve or ring 14 as also is shown in the exploded view of FIG. III.
  • This inner non-magnetic ring 14 is also pressed fit inside the magnetic sleeve or ring 16, and all of their end surfaces are parallel and co-planar with the pole ends of the core 12.
  • Magnetically held by the permanent core magnet 12 is a soft iron pole plate or disk 18 which has an outer periphery or diameter slightly larger than the outer periphery or diameter of the outer sleeve 16, so as to form an anchoring flange 19 as shown in FIG. [I when molded in the plastic base or support B. Because of the strong magnetic pull of the permanent magnet piece 12, it is not necessary to otherwise physically anchor the assembly into the plastic base B, and because this pole plate 18 is completely embedded it does not have to be made of an expensive non-corrosive material or a stainless steel, but may be made of soft iron.
  • the parts 12, 14, and 16 are assembled in the manner shown in FIG. Ill; one part being pressed fit inside the other, and the pole plate 18 being held on one end by the magnetic force of the permanent magnetic core 12.
  • this assembly is embedded in its non-magnetic plastic base or support B, and/or cover C, its other and outer pole surface is polished flat so as to be in same plane with the other outer pole surfaces of the other permanent magnets 10 embedded in the other supports '8 of the memory disk cover C.
  • a permanent magnet structure for casting in a non-magnetic plastic support comprising:
  • said structure being cast into a non-magnetic plastic support so that only the other said pole surface is exposed.
  • plastic support comprises a cover for a memory disk package for a mini-computer.
  • a permanent magnet structure for molding in a plastic support comprising:
  • said assembly and disk being cast into a non-magnetic support so that only the other polar end of said assembly is exposed.
  • said permanent magnet is an alloy of aluminum, nickel, cobalt, copper, titanium and iron.
  • a non-corrosive permanent magnet assembly for casting in a non-magnetic plastic base with one pole exposed, said assembly comprising:

Abstract

A cylindrical non-corrosive permanent magnet assembly having a permanent magnetic core pressed fit into a substantially nonmagnetic stainless steel tube of the same length which is press fit into a second or outer magnetic stainless steel tube of the same length, with one axial pole magnetically holding a soft iron disk having a diameter slightly greater than the diameter of the outer magnetic stainless steel tube. This pole end of the core may be chamfered at its peripheral edge to aid in the press fitting of it into the non-magnetic tube. This assembly is embedded in a plastic base, except for its other exposed pole, and the outwardly extending edge of the disk helps anchor the assembly in the plastic.

Description

United States Patent [191 Studders Aug. 12, 1975 PERMANENT MAGNETIC STRUCTURE [75] Inventor: Robert J. Studders, Toledo, Ohio Prlmary ExammerG' Harms [73] Assignee: Permag Magnetics Corporation, [57] ABSTRACT Toledo A cylindrical non-corrosive permanent magnet assem- [22] Filed; Oct 3, 1974 bly having a permanent magnetic core pressed fit into a substantially non-magnetic stainless steel tube of the [21] Appl- 511,681 same length which is press fit into a second or outer magnetic stainless steel tube of the same length, with 52 US. Cl 335/302; 206/444 one axial P magnetically holding a Soft iron disk [51] Int. Cl. H0lf 7/02 having a diameter Slightly greater than the diameter of 58 Field of Search 206/444; 335/285, 295, the Outer magnetic Stainless Steel tube- This P end 33 5 02 303 30 of the core may be chamfered at its peripheral edge to aid in the press fitting of it into the non-magnetic tube. [56] References Cited This assembly is embedded in a plastic base, except for its other exposed pole, and the outwardly extend- UNITED STATES PATENTS ing edge of the disk helps anchor the assembly in the 3,034,025 5/1962 Budreck et al. 335/295 plastic 3,233,950 2/l966 Baermann 335/306 X 3,365,684 1/1968 Stemke et al. 335/302 12 Claims, 3 Drawing Figures PERMANENT MAGNETIC STRUCTURE BACKGROUND OF THE INVENTION A permanent magnet structure of this invention is primarily an improvement on the permanent magnets embedded in the plastic cover for the memory disk of a mini-computer, such as shown in Crouch et al. US. Pat. No. 3,635,608 issued Jan. 18, 1972, namely the permanent magnets 5 shown in FIGS. 1B and 2 therein.
Previously such permanent magnets have generally comprised magnetic cups into which a central cylindrical permanent magnet was seated equally spaced from the cylindrical sides of the cup by a non-magnetic material. The outsides of these cups were roughened, grooved, or notched to insure their anchorage in the plastic cover, and the outer exposed pole surfaces of these magnets at the open end of the cups were usually highly polished and then plated to prevent their corrosion. This plating often chipped off producing particles that caused errors when they got on the magnetic memory disks.
Accordingly, it is very important that the magnets used for these computer memory disk covers are noncorrosive and have a high strength so as to hold the cover on the package against the hub of the memory disk, in order to prevent all dirt and dust from entering the package during both use and storage of the memory disk. Since the pull of each of these permanent magnets is about 12 lbs., a leverage arrangement is connected to the handle 8 (see FIGS. 1A and 1B of said patent) for breaking the almost 50 lb. force of the four permanent magnets 5 that hold the cover on the package. Because of the precision required in making these cupshaped holding magnets, that is the machining and fitting of their component parts, they are quite expensive.
SUMMARY OF THE INVENTION Generally speaking, the structure of the permanent magnet of this invention comprises a non-corrosive central magnetic core surrounded by two snuggly concentric standard size stainless steel tubes, the inner one non-magnetic and the outer one magnetic, and a magnetic disk pole piece at one end of the assembly whose periphery extends beyond that of the outer tube. One end edge of the central permanent magnetic core may be chamfered or bevelled to aid its force fitting inside of the inner tube. Both of the tubes are of the same length with their ends aligned in parallel planes. The pole piece or disk which is held magnetically and axially of the core against one end of of the core and tubes has a circumference slightly larger than the circumference of the outer tube to prevent the assembly from pulling from the plastic base or mass into which it is cast, embedded or molded. For the specific use of this button type permanent magnet assembly as explained above, namely as a holder for the cover for the memory disk of a mini-computer, the other and exposed polar end of the embedded assembly is ground and polished flush with the other adjacent embedded magnets in the cover so as to form a smooth, intimate and direct contact with the magnetic hub of the memory disk.
By employing a return magnetic path for the flux from the end of the central core magnet through the bottom polar plate and the outer tubular sleeve, an increase pull of about 15% is obtained, over that obtained by the central core magnet alone.
Preferably the core, the surrounding tubes, and the pole plate are all cylindrical. The permanent magnetic core may be cut from a standard size bar of an alloy containing aluminum, nickel, cobalt, titanium, copper, and iron, such as Alnico 6 or 8. The inner sleeve may be cut from a standard size austenitic steel tube, such as of stainless steel No. 304, and the other sleeve may be cut from a larger standard size martensitic steel tube such as of stainless steel No. 410.
OBJECTS AND ADVANTAGES Accordingly, it is an object of this invention to produce an efficient, effective, simple, economical, strong, clean, and non-corrosive permanent magnet structure of assembly for embedding or molding into a plastic supporting base.
Another object is to produce such a magnet from lengths cut from standard stainless steel tubes and bar stock, and a soft iron plate, thereby avoiding as much machining of the parts as possible.
BRIEF DESCRIPTION OF THE VIEWS The above mentioned and other features, objects and advantages, and the manner of obtaining them are described more specifically below by reference to an embodiment of this invention shown in the accompanying drawings wherein:
FIG. I is a perspective view of the inside of a cover for the memory disk of a mini-computer showing four button shaped permanent magnets molded therein, with part of one of the magnets and adjacent cover being broken away;
FIG. II is an enlarged vertical sectional view of one of the magnets shown in FIG. I; and
FIG. III is an enlarged perspective exploded view of the parts of the magnet shown in FIG. II.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT In FIG. I there is shown, for example, a plastic cover C for a mini-computer memory disk package, such as that shown in the above mentioned Crouch et al. patent, having four equally spaced permanent magnet assemblies 10 with all but one polar end of each magnetic assembly embedded in the plastic of the cover C. The plastic cover C is provided with supporting projections or bases B for surrounding the sides of the permanent magnet assemblies 10. The cast plastic material of the cover C, preferably is very durable and non-magnetic, such as a polycarbonate organic plastic like Lexan.
Referring now to FIG. II, the assembled permanent magnet 10 comprises a central core or permanent magnet 12 surrounded by a press fit non-magnetic inner sleeve 14 and then by an outer magnetic sleeve 16. The one pole end or surface 13 of the core 12 may have its outer peripheral edge or comer bevelled at 15 so that it may be pressed fit more easily into the inner sleeve or ring 14 as also is shown in the exploded view of FIG. III. This inner non-magnetic ring 14 is also pressed fit inside the magnetic sleeve or ring 16, and all of their end surfaces are parallel and co-planar with the pole ends of the core 12.
Magnetically held by the permanent core magnet 12 is a soft iron pole plate or disk 18 which has an outer periphery or diameter slightly larger than the outer periphery or diameter of the outer sleeve 16, so as to form an anchoring flange 19 as shown in FIG. [I when molded in the plastic base or support B. Because of the strong magnetic pull of the permanent magnet piece 12, it is not necessary to otherwise physically anchor the assembly into the plastic base B, and because this pole plate 18 is completely embedded it does not have to be made of an expensive non-corrosive material or a stainless steel, but may be made of soft iron.
The parts 12, 14, and 16 are assembled in the manner shown in FIG. Ill; one part being pressed fit inside the other, and the pole plate 18 being held on one end by the magnetic force of the permanent magnetic core 12. Once this assembly is embedded in its non-magnetic plastic base or support B, and/or cover C, its other and outer pole surface is polished flat so as to be in same plane with the other outer pole surfaces of the other permanent magnets 10 embedded in the other supports '8 of the memory disk cover C.
It is to be understood that although the present embodiment of the permanent magnetic assembly 10 is shown to be of circular cross-section, that other shaped prismatic structures can be employed embodying the features of this invention without departingtherefrom.
While there is described above the principles of this invention in connection with specific apparatus, it is to be clearly understood that this description is made only by way of example and not as a limitation to the scope of this invention.
I claim:
1. A permanent magnet structure for casting in a non-magnetic plastic support, said structure comprising:
A. a central non-corrosive permanent magnetic core of outside uniform cross-section with opposite parallel pole surfaces on the opposite axial ends thereof,
B. a non-magnetic non-corrosive inner sleeve intimately surrounding said core extending between and to said parallel pole surfaces,
C. a magnetic non-corrosive outer sleeve intimately surrounding said inner sleeve and also extending between and to said parallel pole surfaces, and
D. a magnetic pole plate slightly larger in outer circumference than the outer circumference of said outer sleeve and magnetically held against one of said pole surfaces,
said structure being cast into a non-magnetic plastic support so that only the other said pole surface is exposed.
2. ls a structure according to claim 1 wherein said core and sleeves are cylindrical.
3. is a structure according to claim 1 wherein said core has one end edge thereof bevelled for easier force fitting into said inner sleeve.
4. ls a structure according to claim 1 wherein said core and two concentric sleeves are forced fit together.
5. Is a structure according to claim 1 wherein said plastic support comprises a cover for a memory disk package for a mini-computer.
6. A permanent magnet structure for molding in a plastic support, said structure comprising:
A. a central solid cylindrical permanent magnet axially polarized,
B. a first stainless austenitic steel cylindrical sleeve around said magnet,
C. a second stainless martensitic cylindrical sleeve around said first sleeve,
said magnet and said sleeves all having the same axial length, and
D. a soft iron pole piece slightly larger in diameter than the outside diameter of said second sleeve held co-axially against one polar end of said magnet and sleeves,
said assembly and disk being cast into a non-magnetic support so that only the other polar end of said assembly is exposed.
7. A structure according to claim 6 wherein said permanent magnet is an alloy of aluminum, nickel, cobalt, copper, titanium and iron.
8. A structure according to claim 6 wherein said magnet and sleeves are forced fit together.
9. A non-corrosive permanent magnet assembly for casting in a non-magnetic plastic base with one pole exposed, said assembly comprising:
A. a central stainless steel permanent magnetic solid cylindrical core having its other axial pole end edge chamfered for force fit into b. a first stainless steel substantially non-magnetic sleeve of the same axial length as said magnetic core which is forced fit into C. a second stainless steel magnetic sleeve of the same axial length as said core in first sleeve, and
D. a soft iron pole disk having an outside diameter slightly larger than the outside diameter of said second sleeve for magnetic attachment to said other pole end of said assembly.
10. An assembly according to claim 9 wherein said first stainless steel sleeve is made of austenitic steel.
11. An assembly according to claim 9 wherein said second stainless steel sleeve is made of martensitic steel.
12. An assembly according to claim 9 wherein said core is an alloy of aluminum, copper, nickel, cobalt, ti-
tanium, and iron.
22 g UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Pateht Nos 3,899; 762 Dated August 12, 1975 Invent0r(s) Robert J. STUDDERS It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
, Signcd and Scaled this fourth Day of No vembe rl9 75 2, line 15 "of" shpuld be or .1
ESEALE Attest:
Rum c. msou c. mnsmu. DANN Arresting Officer Commissioner oflamm and Trademark:
2 g UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No- 3,899, 762 Dated August 12, 1975 I Infientofls) Robert J. STUDDERS It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
. Column 2, line 15 "of" should be or 1 Signed and Scaled this fourth Day Of November 1975 0 33mm v fittest.
RUTH C. MASON C. MARSHALL DANN Arresting Officer Commissioner uflarems and Trademark:

Claims (12)

1. A permanent magnet structure for casting in a non-magnetic plastic support, said structure comprising: A. a central non-corrosive permanent magnetic core of outside uniform cross-section with opposite parallel pole surfaces on the opposite axial ends thereof, B. a non-magnetic non-corrosive inner sleeve intimately surrounding said core extending between and to said parallel pole surfaces, C. a magnetic non-corrosive outer sleeve intimately surrounding said inner sleeve and also extending between and to said parallel pole surfaces, and D. a magnetic pole plate slightly larger in outer circumference than the outer circumference of said outer sleeve and magnetically held against one of said pole surfaces, said structure being cast into a non-magnetic plastic support so that only the other said pole surface is exposed.
2. Is a structure according to claim 1 wherein said core and sleeves are cylindrical.
3. Is a structure according to claim 1 wherein said core has one end edge thereof bevelled for easier force fitting into said inner sleeve.
4. Is a structure according to claim 1 wherein said core and two concentric sleeves are forced fit together.
5. Is a structure according to claim 1 wherein said plastic support comprises a cover for a memory disk package for a mini-computer.
6. A permanent magnet structure for molding in a plastic support, said structure comprising: A. a central solid cylindrical permanent magnet axially polarized, B. a first stainless austenitic steel cylindrical sleeve around said magnet, C. a second stainless martensitic cylindrical sleeve around said first sleeve, said magnet and said sleeves all having the same axial length, and D. a soft iron pole piece slightly larger in diameter than the outside diameter of said second sleeve held co-axially against one polar end of said magnet and sleeves, said assembly and disk being cast into a non-magnetic support so that only the other polar end of said assembly is exposed.
7. A structure according to claim 6 wherein said permanent magnet is an alloy of aluminum, nickel, cobalt, copper, titanium and iron.
8. A structure according to claim 6 wherein said magnet and sleeves are forced fit together.
9. A non-corrosive permanent magnet assembly for casting in a non-magnetic plastic base with one pole exposed, said assembly comprising: A. a central stainless steel permanent magnetic solid cylindrical core having its other axial pole end edge chamfered for force fit into b. a first stainless steel substantially non-magnetic sleeve of the same axial length as said magnetic core which is forced fit into C. a second stainless steel magnetic sleeve of the same axial length as said core in first sleeve, and D. a soft iron pole disk having an outside diameter slightLy larger than the outside diameter of said second sleeve for magnetic attachment to said other pole end of said assembly.
10. An assembly according to claim 9 wherein said first stainless steel sleeve is made of austenitic steel.
11. An assembly according to claim 9 wherein said second stainless steel sleeve is made of martensitic steel.
12. An assembly according to claim 9 wherein said core is an alloy of aluminum, copper, nickel, cobalt, titanium, and iron.
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Cited By (28)

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US3992689A (en) * 1975-07-28 1976-11-16 Data Packaging Corporation Permanent magnet
FR2409223A1 (en) * 1977-11-22 1979-06-15 British Steel Corp Magnetically operated lifting device - has permanent magnets whose field is modified by movable pole piece and seal extending across gap between fixed pole pieces
EP0018944A2 (en) * 1979-04-25 1980-11-12 Crown Obrist AG Closing device for screwing on a plastic screw closure
FR2597933A1 (en) * 1986-04-25 1987-10-30 Sauveplane Pierre Improved magnetic fastening device
US4840105A (en) * 1987-03-16 1989-06-20 Israel Aircraft Industries Ltd. Mine field clearing apparatus
US4867388A (en) * 1986-05-30 1989-09-19 Fuji Photo Film Co., Ltd. Magnetic tape winding device
US5468381A (en) * 1994-05-31 1995-11-21 Williamson; Carlton R. Magnetic filter adapter
US6088973A (en) * 1993-11-08 2000-07-18 Weiss; Hali Monuments, markers and columbariums with improved display indicia
WO2000049919A1 (en) * 1999-02-26 2000-08-31 Dash-It Usa Inc. Magnetic coupler and various embodiments thereof
US20050062572A1 (en) * 2003-09-22 2005-03-24 General Electric Company Permanent magnet alloy for medical imaging system and method of making
US20050068138A1 (en) * 2003-09-29 2005-03-31 General Electric Company Multiple ring polefaceless permanent magnet and method of making
US20050068140A1 (en) * 2003-09-29 2005-03-31 General Electric Company Permanent magnet assembly with movable permanent body for main magnetic field adjustable
US20050073383A1 (en) * 2003-10-01 2005-04-07 General Electric Company Method and apparatus for magnetizing a permanent magnet
US7023309B2 (en) 2001-04-03 2006-04-04 General Electric Company Permanent magnet assembly and method of making thereof
US20060238280A1 (en) * 2005-04-22 2006-10-26 Autronic Plastics, Inc Magnetic springs for asset containers
US7345560B2 (en) 2001-04-03 2008-03-18 General Electric Company Method and apparatus for magnetizing a permanent magnet
US20080187393A1 (en) * 2007-02-02 2008-08-07 John Nellessen Magnetic joint
US20080246573A1 (en) * 2004-07-09 2008-10-09 Souder James J Field configurable magnetic array
US20090083951A1 (en) * 2007-10-01 2009-04-02 Albert Maurer Release mechanism for releasing magnetically releasable anti-theft devices
US20130002382A1 (en) * 2011-06-28 2013-01-03 Bo Zhang Magnetic cup assembly holding device with low magnetic leakage field
US20130097894A1 (en) * 2011-10-20 2013-04-25 Trinity Industries, Inc. Tooth assembly for excavating apparatus with rare earth material
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US20130240470A1 (en) * 2012-03-15 2013-09-19 Chi-Jiun Huang Multi-Purpose Attachment Shelf with a Magnetically Attractive Effect
US20150008999A1 (en) * 2013-07-03 2015-01-08 Bioflow Limited Magnetic assembly
CN108593090A (en) * 2018-04-24 2018-09-28 西人马（厦门）科技有限公司 A kind of magnetic force mounting base
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US3233950A (en) * 1961-05-30 1966-02-08 Baermann Max Permanent magnetic bearing
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Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992689A (en) * 1975-07-28 1976-11-16 Data Packaging Corporation Permanent magnet
FR2409223A1 (en) * 1977-11-22 1979-06-15 British Steel Corp Magnetically operated lifting device - has permanent magnets whose field is modified by movable pole piece and seal extending across gap between fixed pole pieces
EP0018944A2 (en) * 1979-04-25 1980-11-12 Crown Obrist AG Closing device for screwing on a plastic screw closure
EP0018944A3 (en) * 1979-04-25 1981-01-28 Albert Obrist Ag Closing device for screwing on a plastic screw closure, and application of a magnetic clutch to such a closing device
FR2597933A1 (en) * 1986-04-25 1987-10-30 Sauveplane Pierre Improved magnetic fastening device
US4867388A (en) * 1986-05-30 1989-09-19 Fuji Photo Film Co., Ltd. Magnetic tape winding device
US4840105A (en) * 1987-03-16 1989-06-20 Israel Aircraft Industries Ltd. Mine field clearing apparatus
US6088973A (en) * 1993-11-08 2000-07-18 Weiss; Hali Monuments, markers and columbariums with improved display indicia
US5468381A (en) * 1994-05-31 1995-11-21 Williamson; Carlton R. Magnetic filter adapter
WO1995032784A1 (en) * 1994-05-31 1995-12-07 Williamson Carlton R Magnetic filter adapter
WO2000049919A1 (en) * 1999-02-26 2000-08-31 Dash-It Usa Inc. Magnetic coupler and various embodiments thereof
US6305656B1 (en) * 1999-02-26 2001-10-23 Dash-It Usa Inc. Magnetic coupler and various embodiments thereof
US7345560B2 (en) 2001-04-03 2008-03-18 General Electric Company Method and apparatus for magnetizing a permanent magnet
US7023309B2 (en) 2001-04-03 2006-04-04 General Electric Company Permanent magnet assembly and method of making thereof
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