US3467926A - Combined magnetizer and demagnetizer - Google Patents

Combined magnetizer and demagnetizer Download PDF

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Publication number
US3467926A
US3467926A US629256A US3467926DA US3467926A US 3467926 A US3467926 A US 3467926A US 629256 A US629256 A US 629256A US 3467926D A US3467926D A US 3467926DA US 3467926 A US3467926 A US 3467926A
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shank
screwdriver
pair
magnet
magnetizing
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US629256A
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Cloyd D Smith
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising

Definitions

  • a combined magnetizer and demagnetizer constructed with a strong permanent magnet having a pair of opposed, parallel, major surfaces, each carrying an opposite polarity, and a ferromagnetic plate substantially coextensive with and mounted on one of the major surfaces of the magnet.
  • the invention relates to improvements in devices for magnetizing and demagnetizing ferrous members, such as screwdrivers.
  • demagnetization has, for the most part, been effected by subjecting a tool possessing some degree of magnetism to a powerful alternating field.
  • Another, although less favored, procedure for removing magnetism includes heating the magnetic item to a high temperature; or jarring it repeatedly.
  • FIGURE 1 is a top plan view of one form of the device showing, in broken line, a portion of the shank of a screwdriver being wiped across the magnet to induce magnetism into the screwdriver;
  • FIGURE 2 is a side elevational view, portions being broken away to reveal the underlying structure
  • FIGURE 3 is a bottom plan view
  • FIGURE 4 is a fragmentary transverse sectional view, to an enlarged scale, showing a portion of the shank of a screwdriver undergoing demagnetization, the plane being indicated by the line 4-4 in FIGURE 3;
  • FIGURE 5 is a prespective view of a modified form of the device, showing in broken'line the position of a screwdriver being magnetized;
  • FIGURE 6 is a median, vertical, longitudinal sectional view of the FIGURE 5 form of device
  • FIGURE 7 is a transverse sectional view, the plane of the section being indicated by the line 77 in FIGURE 5;
  • FIGURE 8 is an idealized sectional View to an enlarged scale of a magnet, showing a screwdriver being demagnetized;
  • FIGURE 9 is a side elevation of another modification.
  • FIGURES 1 through 4 The form of the invention illustrated in FIGURES 1 through 4 is, for convenience, designated as the paddle form and bears the general reference numeral 12.
  • a handle 13 having a size and configuration lending it self to convenient grasping by one hand is secured, as by rivets 14, to an elongated sheet metal plate 16 projecting beyond the handle and terminating, for the sake of appearance and protection, in a rounded tip 17.
  • An opening 18 in the base end of the handle allows the device to be suspended from a nail in the wall or bench for ease and compactness of storage.
  • a pair of lateral flanges 19 on the plate turns at right angles to the plate 16 and at least partially covers the lateral edge surfaces 21 of a strong permanent magnet 22.
  • the magnet 22 is secured to the underlying sheet metal plate 16 and to the upstanding flanges 19 by an appropriate adhesive.
  • the magnet 22 is a parallelepiped in configuration, and in addition to the opposite pair of narrow lateral edge surfaces 21, also includes an opposite pair of large side surfaces, namely an outer, exposed, side surface 23 and an inner side surface 24 (see FIGURE 2).
  • the major side surfaces 23 and 24, and the minor edge surfaces 21 are at right angles, their intersection aflording an exposed pair of corner lines 26 and an interior pair of corner lines 27 (see FIGURE 4).
  • the interior corner lines 27 are enclosed by the flanges 19, and the right angled flanges 19, in turn, carry an exposed pair of corner lines 31.
  • the magnet 22 terminates to form a pair of transverse end surfaces 36.
  • the paddle handle 13 is grasped in one hand with the face 23 up. Then the screwdriver handle 42 is taken with the other hand and the shank 41 placed on the upper, or exposed major surface 23 of the magnet, as shown in FIGURE 1. The shank 41 is thereupon wiped across the surface 23 in the direction indicated by the arrow 43. If desired, the tool 42 can be lifted from the surface at the end of the stroke and the cycle repeated to increase the induced magnetism.
  • the magnetizing step, or operation, is perhaps best explained by the classical molecular theory first advanced by Weber (Wilhelm Edward, 1804-1891, a German physicist who, for most of his life, occupied the chair of physics at Gottingen). Under the Weber theory, each of the molecules in the screwdriver shank is assumed to be a very small magnetic particle with its own Northpole and South-pole. When no magnetizing force is being applied, these small magnets are arranged in a haphazard manner so that the various molecular N- and S-poles all neutralize one another, and no external magnetic effect, or field, is produced. I
  • the small magnets tend to arrange themselves so that their axes are parallel and their N-poles are all pointing in the same general direction as the magnetizing force.
  • the atomic magnets produced by the movement of the planetary electrons around the nucleus, have a strong tendency to line up together in groups of from to 10 atoms regardless of and without the influence of any external magnetic field.
  • Each tiny domain (10 of them may be contained in one cubic millimeter) is always magnetized to saturation, and the addition of an external magnetic field does not increase the inherent magnetism of the individual domains as seen from a microscopic point of view.
  • an external magnetic field is effective to align the individual domains with the external field, such as by wiping the screwdriver shank 41 across the magnet 22.
  • the substance as a whole exerts an external magnetic field, i.e. it is itself magnetized.
  • a magnetic object allowed to remain for a long period of time disoriented with respect to the earths magnetic field, will, in due course, lose its magnetism; i.e. its individual molecular magnets or its domains will, in time, re-assume a random arrangement.
  • Jarring and heating the magnetized object are other methods effective to yield reorientation of the particles into haphazard patterns.
  • a powerful alternating current field imposed upon a magnetized article has also long been used, for example, to demagnetize tools, watches, etc.
  • the rapidly expanding and collapsing field produced by a conductor coil carrying AC. has heretofore been widely used despite the disadvantages of requiring an energy source, wires and special equipment.
  • a magnetized object such as a screwdriver
  • FIGURES 5-7 Reference is now had to the block form of device shown in FIGURES 5-7.
  • a parallelepiped 51 such as a block, of non-magnetic material, carries a pair of rounded end portions 52 connected by an elongated central vertical web 53 pierced longitudinally by a horizontal through-bore 54, and, vertically, by an intersecting aperture 56 (see FIGURES 6 and 7).
  • the circular cross-section through-bore 54 lends itself to use in magnetizing elongated objects, such as screwdriver shanks 55, or probes, or rods, whereas the longitudinally distended vertical aperture 56 is especially useful in magnetizing objects having some width, such as a small end wrench or a small crescent wrench.
  • An opposed pair of recesses 57 formed in the sides of the block snugly receives a corresponding pair of strong permanent magnets 61.
  • a pair of protective, paramagnetic plates 62 having chisel-shaped ends 63 receivable in corresponding V- shaped vertical grooves 64 in the end caps 52.
  • a strong adhesive is often used to secure the magnets and plates to the mutually engaging walls and grooves of the block member 51.
  • the magnets 61 are of the same kind as previously described in connection with the FIGURES 1-4 form of device, and each includes a pair of major side surfaces 66, a pair of minor edge surfaces 67 and a pair of end surfaces 68.
  • One major surface is an N-pole; the other, an S-pole.
  • the plates 62 differ somewhat, however, from the earlier described plates 16 of the FIGURES 1-4 form of device.
  • the plates 62 are not flanged. Instead, they are substantially planar and are substantially coextensive with the side surfaces 66 of the magnets. In fact, it has been found by exhaustive experimentation, that the plates 62 serve their demagnetization function most efficiently when their width (shown vertically in FIGURES 5 and 7) is precisely equal to the vertical width of the magnets 61.
  • the screwdriver shank is inserted through the bore 54 to the hilt (see FIGURE 6), then is withdrawn.
  • the aperture 56 can be used rather than the bore 54. In either case, the slight thickness of the web material (e.g., plastic) does not materially interfere with magnetization.
  • the web material e.g., plastic
  • One cycle i.e. insertion and withdrawal, is ordinarily sufficient to induce a strong permanent magnetism even in a hard steel object.
  • a soft iron or a soft steel object (such as a brad or nail) is more readily magnetized, but retains only a very small portion of the magnetism initially imparted to it.
  • a hard steel resists being magnetized, but upon being magnetized, is permanent.
  • the butt end of the shank is placed against the outer corner 71 of the plate 62 (or horizontally across the top or bottom) and sharply wiped. At the conclusion of the stroke, demagnetization is effected.
  • FIGURE 8 To help explain what is believed to happen to the aligned, magnetic molecules or domains as the shank 55 is progressively swept over the plate 62.
  • FIGURE 8 illustrates in idealized form a magnet 81 of the type used herein, namely, a magnet having a pair of opposedmajor side surfaces 82 (N-pole) and 83 (S- pole) as well as a pair of minor edge surfaces 84.
  • the plates 16 (and 62) not only protect the adjacent magnets 22 and 61, respectively, as wiping is effected, but they also apparently helpfully serve to distort the magnetic field in accordance with the well know law of the magnetic field to the effect that the magnetic field" always tends to conform itself so that the maximum amount of flux is attained.
  • the force lines are drawn toward and into the plates and serve greatly to intensify the field immediately adjacent the portion upon which the screwdriver is wiped.
  • FIGURE 8 Shown being moved along the corner 86 in FIGURE 8 is a ferromagnetic rod 87 previously rnagnetized'so that the molecules 88, or domains, or particles, or dipoles are longitudinally aligned, as appears in the upper left hand end of the rod.
  • the uppermost dipole 88 is further assumed to take the successive lower positions shown as the rod is swept downwardly in the direction of the arrow91, as in a motion picture sequence.
  • the broken lines 92 depict, in well-known manner, the imaginary lines of force existing in the magnetic field 93 exerted by the strong permanent magnet 81.
  • the axially aligned particle 88 encounters the force line 92a, tending to reorient the particle, tangentto the force line, into the attitude, as at 88a, with the S-pole of he particle facmg toward the north pole 82 of the magnet 81.
  • the force exerted on the particle will vary inversely in power with the distance.
  • a more intense effort is applied, the particle being severely re-oriented, even possibly assuming the reverse orientation indicated at 88 Thereafter, but with weaker effect, as the subsequent force lines are out, still different postures are assumed, as shown in stylized fashlon 1n FIGURE 8.
  • the total effect on all of the various particles located throughout the rod is to return them to a haphazard arrangement wherein no external magnetic field is provided.
  • the rod in short, is demagnetized.
  • FIGURE 9 Reference is now had to another modification, as shown in FIGURE 9.
  • This modification 112 resembles in many respects, the paddle form of device 12 illustrated in FIGURES 1-4, like reference numerals being applied, where appropriate.
  • T-he FIGURE 9 modification differs, however, in that the upper, exposed side surface 23 of the magnet 22, is covered by a sheet 116 of non-ferrous material, such as aluminum.
  • the lateral margins of the aluminum sheet 116 are bent downwardly, at right angles, to form a pair of flanges 119 abutting the corresponding upstanding flanges 19 formed of ferrous material.
  • the end 117 of the aluminum sheet 116 projects forwardly and corresponds to the forward projection 17 of the ferrous plate 16.
  • FIGURE 9 form of device affords an especially interesting, unexpected and useful result both as to magnetizing and demagnetizing a tool, such as a screwdriver shank 14.
  • Magnetization is effected in essentially the same manner as previously explained in connection with the FIGURES 14 form of device.
  • the screwdriver shank 141 is placed horizontally on the upper surface of the non-ferrous sheet 116 transversely with respect to the magnet 22, as in FIGURE 1, and is wiped across the sheet from hilt to tip of the screwdriver shank.
  • Demagnetization is achieved by quite a different procedure.
  • This demagnetization procedure is as follows.
  • the screwdriver shank 141 is first positioned in a horizontal, attitude, as appears in full line in FIGURE 9, with the shank located about inch above the surface 121 of the non-ferrous sheet 116, the screwdriver being axially positioned approximately in the position shown in broken line in FIGURE 1.
  • the screwdriver is thereupon vertically lowered in the direction of the arrow 142 (see FIGURE 9), until the shank 141 horizontally touches or engages the horizontal upper surface 121 of the non-ferrous sheet 116, as indicated in broken line in FIGURE 9.
  • the shank 141 is touched only instaneously to the sheet, and is thereupon returned to approximately the upper location shown in full line in FIGURE 9.
  • the screwdriver is shifted axially toward the observer, ie in the direction of the arrow 43 in FIGURE 1, by an amount approximately equal to the transverse width of the magnet 22; and the cycle of lowering, touching and lifting the shank is repeated.
  • a magnetic device comprising:
  • each of said parallel- (c) a second plate substantially coextensive in size epipeds is identical in size with the other and terminates and in face-to-face engagement with the opposite of in a pair of opposite end surfaces at right angles to said 5 said major side surfaces and including a pair of side surfaces and said edge surfaces. flanges bent at right angles to overlie at least 3.
  • said parallelepipeds a portion of said opposite edge surfaces; and, and said plates are elongated and are of the same (d) an elongated handle mounted on at least one of idth, said plates and extending in a direction normal to and 4.
  • a combined magnetizing and demagnetizing device 10 away from said end surfaces. comprising:

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Treatment Devices (AREA)
  • Hard Magnetic Materials (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Microwave Tubes (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
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US629256A 1967-04-07 1967-04-07 Combined magnetizer and demagnetizer Expired - Lifetime US3467926A (en)

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US (1) US3467926A (enrdf_load_stackoverflow)
AT (1) AT285760B (enrdf_load_stackoverflow)
BE (1) BE712794A (enrdf_load_stackoverflow)
CH (1) CH465060A (enrdf_load_stackoverflow)
DE (2) DE1985056U (enrdf_load_stackoverflow)
FR (1) FR1564140A (enrdf_load_stackoverflow)
GB (1) GB1197779A (enrdf_load_stackoverflow)
NL (1) NL6804894A (enrdf_load_stackoverflow)
SE (1) SE352769B (enrdf_load_stackoverflow)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662303A (en) * 1971-03-08 1972-05-09 Anatoli Arllof Instant magnetizer and demagnetizer
US4160283A (en) * 1978-04-26 1979-07-03 Howard A. Spoklie Magnetizing and demagnetizing tool
US4237518A (en) * 1979-05-11 1980-12-02 Krulwich Lester S Nonelectric magnetizer and demagnetizer
US5151843A (en) * 1989-12-08 1992-09-29 Minnesota Mining And Manufacturing Company Sensitizer for ferromagnetic markers used with electromagnetic article surveillance systems
AU629424B2 (en) * 1989-12-08 1992-10-01 Minnesota Mining And Manufacturing Company Sensitizer for ferromagnetic markers used with electromagnetic article surveillance systems
US6026717A (en) * 1998-07-23 2000-02-22 Anderson; Wayne Driver tool with high energy magnetizer/demagnetizer on tool handle
US6026718A (en) * 1998-09-28 2000-02-22 Anderson; Wayne High energy magnetizer and selective demagnetizer integral with driver tool or the like
US6032557A (en) * 1998-09-01 2000-03-07 Anderson; Wayne Driver tool kit with high energy magnetizer/demagnetizer on tool handle(s)
US6060801A (en) * 1998-09-28 2000-05-09 Anderson; Wayne High energy magnetizer/demagnetizer for drill housing
US6249199B1 (en) * 2000-04-10 2001-06-19 George Liu Quick magnetizing and demagnetizing device for screwdrivers
USD867081S1 (en) * 2017-12-29 2019-11-19 Po-Yi Chiang Magnetic hand tool for magnetically picking up elements
CN112904699A (zh) * 2021-03-02 2021-06-04 上海科世达-华阳汽车电器有限公司 一种汽车peps系统及其消磁控制方法
CN113647931A (zh) * 2011-09-06 2021-11-16 伊卓诺股份有限公司 用于磁化细长医疗装置的设备和方法
CN114451995A (zh) * 2020-11-09 2022-05-10 巴德阿克塞斯系统股份有限公司 磁化器及相关系统
USD979359S1 (en) * 2021-05-14 2023-02-28 Jheng-Tsung Jiang Magnetizer for hand tools
US12059243B2 (en) 2020-11-10 2024-08-13 Bard Access Systems, Inc. Sterile cover for medical devices and methods thereof
US12207840B2 (en) 2017-04-27 2025-01-28 Bard Access Systems, Inc. Magnetizing system for needle assemblies
US12230427B2 (en) 2021-07-26 2025-02-18 Bard Access Systems, Inc. Medical-device magnetizer systems and methods
US12232826B2 (en) 2021-06-22 2025-02-25 Bard Access Systems, Inc. Medical device magnetizer system with indicators

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2476375A1 (fr) * 1980-02-15 1981-08-21 Aimants Ugimag Sa Dispositif pour l'aimantation multipolaire d'un materiau en bandes

Citations (4)

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Publication number Priority date Publication date Assignee Title
US2904364A (en) * 1958-07-31 1959-09-15 Westinghouse Electric Corp Magnetic latch
US3281742A (en) * 1964-08-03 1966-10-25 Zenith Radio Corp Color tube degausser
US3331043A (en) * 1965-09-14 1967-07-11 Raul Mariano Orzabal Permanent holding magnet
US3349354A (en) * 1965-06-02 1967-10-24 Miyata Saburo Means for imposing electric and magnetic fields on flowing fluids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2904364A (en) * 1958-07-31 1959-09-15 Westinghouse Electric Corp Magnetic latch
US3281742A (en) * 1964-08-03 1966-10-25 Zenith Radio Corp Color tube degausser
US3349354A (en) * 1965-06-02 1967-10-24 Miyata Saburo Means for imposing electric and magnetic fields on flowing fluids
US3331043A (en) * 1965-09-14 1967-07-11 Raul Mariano Orzabal Permanent holding magnet

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662303A (en) * 1971-03-08 1972-05-09 Anatoli Arllof Instant magnetizer and demagnetizer
US4160283A (en) * 1978-04-26 1979-07-03 Howard A. Spoklie Magnetizing and demagnetizing tool
US4237518A (en) * 1979-05-11 1980-12-02 Krulwich Lester S Nonelectric magnetizer and demagnetizer
US5151843A (en) * 1989-12-08 1992-09-29 Minnesota Mining And Manufacturing Company Sensitizer for ferromagnetic markers used with electromagnetic article surveillance systems
AU629424B2 (en) * 1989-12-08 1992-10-01 Minnesota Mining And Manufacturing Company Sensitizer for ferromagnetic markers used with electromagnetic article surveillance systems
US6026717A (en) * 1998-07-23 2000-02-22 Anderson; Wayne Driver tool with high energy magnetizer/demagnetizer on tool handle
US6032557A (en) * 1998-09-01 2000-03-07 Anderson; Wayne Driver tool kit with high energy magnetizer/demagnetizer on tool handle(s)
US6026718A (en) * 1998-09-28 2000-02-22 Anderson; Wayne High energy magnetizer and selective demagnetizer integral with driver tool or the like
US6060801A (en) * 1998-09-28 2000-05-09 Anderson; Wayne High energy magnetizer/demagnetizer for drill housing
US6249199B1 (en) * 2000-04-10 2001-06-19 George Liu Quick magnetizing and demagnetizing device for screwdrivers
CN113647931A (zh) * 2011-09-06 2021-11-16 伊卓诺股份有限公司 用于磁化细长医疗装置的设备和方法
US12207840B2 (en) 2017-04-27 2025-01-28 Bard Access Systems, Inc. Magnetizing system for needle assemblies
USD867081S1 (en) * 2017-12-29 2019-11-19 Po-Yi Chiang Magnetic hand tool for magnetically picking up elements
CN114451995A (zh) * 2020-11-09 2022-05-10 巴德阿克塞斯系统股份有限公司 磁化器及相关系统
US20220142501A1 (en) * 2020-11-09 2022-05-12 Bard Access Systems, Inc. Medical Device Magnetizer
US11911140B2 (en) * 2020-11-09 2024-02-27 Bard Access Systems, Inc. Medical device magnetizer
US12239428B2 (en) 2020-11-09 2025-03-04 Bard Access Systems, Inc. Medical device magnetizer
US12059243B2 (en) 2020-11-10 2024-08-13 Bard Access Systems, Inc. Sterile cover for medical devices and methods thereof
CN112904699A (zh) * 2021-03-02 2021-06-04 上海科世达-华阳汽车电器有限公司 一种汽车peps系统及其消磁控制方法
USD979359S1 (en) * 2021-05-14 2023-02-28 Jheng-Tsung Jiang Magnetizer for hand tools
US12232826B2 (en) 2021-06-22 2025-02-25 Bard Access Systems, Inc. Medical device magnetizer system with indicators
US12230427B2 (en) 2021-07-26 2025-02-18 Bard Access Systems, Inc. Medical-device magnetizer systems and methods

Also Published As

Publication number Publication date
SE352769B (enrdf_load_stackoverflow) 1973-01-08
BE712794A (enrdf_load_stackoverflow) 1968-07-31
FR1564140A (enrdf_load_stackoverflow) 1969-04-18
NL6804894A (enrdf_load_stackoverflow) 1968-10-08
DE1589765A1 (de) 1970-05-14
AT285760B (de) 1970-11-10
CH465060A (de) 1968-11-15
DE1985056U (de) 1968-05-09
GB1197779A (en) 1970-07-08

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