US2144184A - Magnet construction - Google Patents
Magnet construction Download PDFInfo
- Publication number
- US2144184A US2144184A US755306A US75530634A US2144184A US 2144184 A US2144184 A US 2144184A US 755306 A US755306 A US 755306A US 75530634 A US75530634 A US 75530634A US 2144184 A US2144184 A US 2144184A
- Authority
- US
- United States
- Prior art keywords
- magnet
- magnets
- dimension
- length
- formula
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S206/00—Special receptacle or package
- Y10S206/818—Magnet
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S211/00—Supports: racks
- Y10S211/01—Magnetic article holder
Definitions
- Our invention relates to a method of constructing magnets of a small size to act as a supporting means for display letters or devices or toys formed of a plastic or other moulded material, or for the construction of magnets for any other use where high magnetic power in relation to the'mass or volume of the magnet is a requisite.
- Our invention further relates to a combination of such magnets with plastic letters, devices or toys and a magnetic metallic plate for supporting and displaying such letters.
- Fig. 1 is a side elevation of a magnet drawn four times natural size.
- Fig. 2 is an end elevation of such a magnet.
- Fig. 3 is a perspective view of the magnet shown in Figs. 1 and 2.
- Fig. 4 is a reverse view of a figure 4 containing a magnet 3 and a magnet 4.
- Fig. 5 is a perspective view of the figure 4 shown in Fig. 4. a
- the dimension 1" refers to the actual length of the magnet
- the dimension L shown by the dotted line, refers to the length of the magnet as discussed in this application, length referring to the distance from the center of one face to the center of the other along the dotted line
- the dimension H refers to the height including the feet
- dimension F refers to the width of the foot at the face of the magnet pole and the dimension B refers to width of the foot at its base
- dimension T refers to the height of the magnet not taking into account the feet
- the dimension W refers to the width of the magnet.
- D which we term the diameter of the magnet and which appears in the formula below, is the diameter of a circle having an area equal to the cross sectional area of the magnet, determined from the equation to have the value producing small plastic tablets containing magnets of sufficient magnetic power to support the tablets permanently and firmly upon a plate of magnetic material.
- the available material is Nissan magnet steel containing 35% cobalt having a B1: of 10,000 in gauss and an He of 225 in oersteds. If the practicable limit for the magnets over all length, or L is using the formula, the other dimensions of the magnet should be .75" H. Twat This would give a diameter of- .09 inch.
Description
Jan. 17, 1939. G HALE ET AL 2,144,184
MAGNET CONSTRUCTION Filed Nov. 30, 1934 652/94 0 //AL .6 K. 1. 56077 INVENTORS Q5 wW M ATTORNEY.
Patented Jan. 17, 1939 UNITED STATES PATENT OFFICE Western Springs, 111., assign ors, by mesne assignments, to Magnet-O-Signs Corporation, a
corporation of Illinois Application November 30, 1934, Serial No. 755,306
Our invention relates to a method of constructing magnets of a small size to act as a supporting means for display letters or devices or toys formed of a plastic or other moulded material, or for the construction of magnets for any other use where high magnetic power in relation to the'mass or volume of the magnet is a requisite.
Our invention further relates to a combination of such magnets with plastic letters, devices or toys and a magnetic metallic plate for supporting and displaying such letters.
Other objects of our invention will appear and be described in the specification.
The novelty of our invention will be hereinafter more fully set forth and specifically pointed out in the claim.
In the accompanying drawing;
Fig. 1 is a side elevation of a magnet drawn four times natural size.
Fig. 2 is an end elevation of such a magnet.
Fig. 3 is a perspective view of the magnet shown in Figs. 1 and 2.
Fig. 4 is a reverse view of a figure 4 containing a magnet 3 and a magnet 4.
Fig. 5 is a perspective view of the figure 4 shown in Fig. 4. a
In Fig. l, the dimension 1" refers to the actual length of the magnet; the dimension L, shown by the dotted line, refers to the length of the magnet as discussed in this application, length referring to the distance from the center of one face to the center of the other along the dotted line; the dimension H refers to the height including the feet; dimension F refers to the width of the foot at the face of the magnet pole and the dimension B refers to width of the foot at its base; dimension T refers to the height of the magnet not taking into account the feet; in Fig. 2 the dimension W refers to the width of the magnet. D, which we term the diameter of the magnet and which appears in the formula below, is the diameter of a circle having an area equal to the cross sectional area of the magnet, determined from the equation to have the value producing small plastic tablets containing magnets of sufficient magnetic power to support the tablets permanently and firmly upon a plate of magnetic material. We have found that by maintaining certain dimensional proportions in magnets, the most efficient magnet in relation to its size or mass can be produced. In maintaining these proportions the maximum efilciency is attained, when using a high quality of cobalt magnet steel containing between 25% and 35% of cobalt, or precipitation hardening magnet ailoys, or other alloys of a magnetic quality equal to cobalt magnet steel.
We have found that if a dimensional relation is maintained between the length ofthe magnet, or L, and the magnets diameter, or D, taking into account certain properties of the magnet material hereafter referred to, the most emcient magnet will result.
We have further found that a specific relationship exists between the strength of the magnet, the dimensions of the magnet, and the magnetic properties of the magnet material, that is, the residual induction in gauss, represented in the art by the symbol Br, and the coercive force in oersteds, represented in the art by the symbol He. Both of these properties have been or can be specifically determined for any given magnet material. In producing a magnet of the desired maximum efiiciency, we follow the formula Following this formula will produce the strongest magnet possible from a given amount of material or in a magnet of a given length, or a desired diameter. Assume that it is necessary to design magnets of sufiicient power to support a plastic figure four, one and one-half inches high. The available material is Honda magnet steel containing 35% cobalt having a B1: of 10,000 in gauss and an He of 225 in oersteds. If the practicable limit for the magnets over all length, or L is using the formula, the other dimensions of the magnet should be .75" H. Twat This would give a diameter of- .09 inch.
While in the laboratory, the foregoing formula produces the best result, in practice, particularly in the production of very small magnets, a small variation from the dimensions obtained from the formula will still very closely approximate the results obtained from following the formulae:- actly.
The foregoing formula applies only to a straight bar magnet and does not take into account the feet, I and 2, Fig. 1 which are tapered from the width at the base, B, to the width at the face, F, a construction which adds to the strength and force of the magnet. There seems to be no precise formula to follow in constructing the taper oi the feet but we have determined that the dimension H, Fig. l, is substantially constant with the dimension W, Fig. 2, and the dimensions B and F, Fig. I, maintain the ratio of three to two.
Applying these magnets to our display method for letters, numbers, symbols or devices and the like, or to childrens toys formed of disassembled pieces or otherwise, we take a piece of moulded plastic material having from one to three magnets of the requisite strength positioned in the back of the piece, the feet of the magnets being either flush with the back, protruding therefrom toga desired length to set of! the piece of material from a magnetic plate, or recessed in the plastic. If permanent magnets of the necessary strength are used, the tablets can be attached indefinitely to a metal1ic plate and can be removed therefrom or rearranged as desired.
Having fully described our invention, we claim: A permanent magnet of cobalt magnet steel containing between 25-35 per cent. cobalt, of a shape adapted to be embedded in tablets for holding them against plates of ferro-magnetic material, having a length or diameter bearing a relationship to the other dimension conforming substantially to the formula, the product of length times the square root of the coercive force of the material used is equal to 1.25 times the diameter times the square root of the residual induction of the material used.
GERALD HALE. KENNETH L. SCOTT.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US755306A US2144184A (en) | 1934-11-30 | 1934-11-30 | Magnet construction |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US755306A US2144184A (en) | 1934-11-30 | 1934-11-30 | Magnet construction |
Publications (1)
Publication Number | Publication Date |
---|---|
US2144184A true US2144184A (en) | 1939-01-17 |
Family
ID=25038599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US755306A Expired - Lifetime US2144184A (en) | 1934-11-30 | 1934-11-30 | Magnet construction |
Country Status (1)
Country | Link |
---|---|
US (1) | US2144184A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2506600A (en) * | 1948-08-02 | 1950-05-09 | Kassovic Stephen | Dispenser cigarette case |
US2580099A (en) * | 1949-08-09 | 1951-12-25 | Clemens O Jaeger | Double magnetic holding device |
US2589349A (en) * | 1948-11-10 | 1952-03-18 | Ervin P Diefenbach | Magnetic key case |
US2801294A (en) * | 1950-11-24 | 1957-07-30 | Holmberg & Co Kommanditgesells | Electrodynamic receiving apparatus |
US2864275A (en) * | 1954-07-14 | 1958-12-16 | Alton L Fraleigh | Musical educational board |
US2935936A (en) * | 1956-07-17 | 1960-05-10 | Clarence W Woodring | Stencil with magnetic holding means |
US2969605A (en) * | 1959-10-13 | 1961-01-31 | Safety Sake Entpr Inc | Display device |
US3024392A (en) * | 1954-08-27 | 1962-03-06 | Baermann Max | Process for the manufacture of plastic bound permanent magnets |
US3133015A (en) * | 1957-08-16 | 1964-05-12 | Cottrell Res Inc | Apparatus for separating magnetic susceptible particles |
US3827774A (en) * | 1972-12-06 | 1974-08-06 | Quaker Oats Co | Toy desk |
US8499943B1 (en) * | 2009-04-20 | 2013-08-06 | Jaqueline P. Neldner | Decorative magnetic tool holding apparatus and method of holding scissors |
-
1934
- 1934-11-30 US US755306A patent/US2144184A/en not_active Expired - Lifetime
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2506600A (en) * | 1948-08-02 | 1950-05-09 | Kassovic Stephen | Dispenser cigarette case |
US2589349A (en) * | 1948-11-10 | 1952-03-18 | Ervin P Diefenbach | Magnetic key case |
US2580099A (en) * | 1949-08-09 | 1951-12-25 | Clemens O Jaeger | Double magnetic holding device |
US2801294A (en) * | 1950-11-24 | 1957-07-30 | Holmberg & Co Kommanditgesells | Electrodynamic receiving apparatus |
US2864275A (en) * | 1954-07-14 | 1958-12-16 | Alton L Fraleigh | Musical educational board |
US3024392A (en) * | 1954-08-27 | 1962-03-06 | Baermann Max | Process for the manufacture of plastic bound permanent magnets |
US2935936A (en) * | 1956-07-17 | 1960-05-10 | Clarence W Woodring | Stencil with magnetic holding means |
US3133015A (en) * | 1957-08-16 | 1964-05-12 | Cottrell Res Inc | Apparatus for separating magnetic susceptible particles |
US2969605A (en) * | 1959-10-13 | 1961-01-31 | Safety Sake Entpr Inc | Display device |
US3827774A (en) * | 1972-12-06 | 1974-08-06 | Quaker Oats Co | Toy desk |
US8499943B1 (en) * | 2009-04-20 | 2013-08-06 | Jaqueline P. Neldner | Decorative magnetic tool holding apparatus and method of holding scissors |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2144184A (en) | Magnet construction | |
US2872754A (en) | Magnetic toy building blocks | |
US2665912A (en) | Magnetic game board with magnetized spherical game pieces | |
US2249454A (en) | Magnetic novelty | |
GB1299157A (en) | Permanent magnet | |
SE7607760L (en) | PERMANENT MAGNET AND PROCEDURES FOR THE PRODUCTION OF THE SAME | |
US1639580A (en) | Magnetic t-square | |
JPS55115304A (en) | Permanent magnet material | |
IT976647B (en) | PROCEDURE TO PRODUCE COBALT IRON ALLOYS WITH IMPROVED MAGNETIC CHARACTERISTICS AND THE GHEA THUS OBTAINED | |
GB1432969A (en) | ||
GB532116A (en) | Improvements in or relating to magnetic recording and reproducing apparatus for use with steel bands, wires or the like | |
BE771773A (en) | PROCESS ALLOWING THE MANUFACTURE OF A MAGNETICALLY ANISOTROPIC BODY PRESENTING PERMANENT MAGNETIC PROPERTIES | |
GB967875A (en) | Magnetic structures comprising fine particles of magnetic material disposed in a lead or lead alloy matrix | |
USD118584S (en) | Design for an advertising display | |
KR890004352A (en) | High frequency magnetic core material made of Fe-Co alloy | |
JPS54150699A (en) | Manufacture of roll-like magnet | |
JPS52111490A (en) | Production of material containing lamellar graphite | |
USD92884S (en) | Design fob a housing for a permanent | |
DE489174C (en) | Lifting magnetic pole for magnetic separator | |
USD118501S (en) | Design for a combined box and base | |
USD93822S (en) | Design fob a sign | |
USD159411S (en) | Printing plate cabinet | |
JPS51130897A (en) | Manufacturing method of permanent magnet having magnetic unisotropy | |
JPS5630708A (en) | Material of permanent magnet | |
DE968878C (en) | Eddy current tachometer |