Abstract: An object is to provide a lifting-magnet attachment magnetic pole unit, a lifting magnet, a steel material conveying method, and a steel plate manufacturing method with which only one or a desired pieces of steel materials can be held. The present invention is a lifting-magnet attachment magnetic pole unit for a lifting magnet used to lift and convey a steel material with magnetic force. The lifting-magnet attachment magnetic pole unit includes a first split magnetic pole that is in contact with an iron core of the lifting magnet and has a branched structure, and a second split magnetic pole that is in contact with a yoke of the lifting magnet and has a branched structure. The first and second split magnetic poles are alternately arranged.

Abstract: A magnetic substance holding device includes: a first pole piece assembly comprising at least one first pole piece, at least two second pole pieces, and at least two first permanent magnets; a second pole piece assembly comprising at least one third pole piece, at least two fourth pole pieces, and at least two second permanent magnets; a coil; and a control device. The first pole piece assembly and/or the second pole piece assembly is configured to be movable such that they are switched between a first arrangement in which the second faces of the first pole piece assembly are spaced apart from the first faces of the second pole piece assembly, and a second arrangement in which the second faces of the first pole piece assembly come in contact with the first faces of the second pole piece assembly.

Abstract: An electromagnetic actuator includes a first body which includes a biased permanent magnet, a magnetic path control device which is disposed to adjust a magnetic path produced by the biased permanent magnet, at least one core which is disposed to face the biased permanent magnet and the magnetic path control device, and a coil which is wound on the at least one core so as to reinforce or cancel the magnetic path produced by the biased permanent magnet; and a second body which is separated from the biased permanent magnet and the magnetic path control device when the at least one core is between the second body and at least one of the biased permanent magnet and the magnetic path control device.

Abstract: A method for assembling parts. A sealant is placed between a plurality of parts in a stack up to form a workpiece. The workpiece is clamped using a permanent magnet unit and an electromagnetic clamping device in an activated state such that a number of forces caused by a magnetic field clamps the workpiece between the electromagnetic clamping device and the permanent magnet unit. A number of holes are drilled in the workpiece. A number of fasteners are installed in the number of holes.

Abstract: A magnetic coupling system for electromagnetically connecting an electric device to a mounting system, including: a first interface comprising a first plurality of magnetic elements and a first induction coil defining a first central axis, the first interface connected to the electric device; and a second interface comprising a second plurality of magnetic elements and a second induction coil defining a second central axis, the second interface connected to the mounting system, wherein magnetic attraction between the first and second plurality of magnetic elements biases the first interface toward the second interface and transiently retains the first and second induction coils in a substantially coaxial relationship.

Abstract: An electromagnetic clamping system contains a housing, numerous permanent magnets, numerous low friction surfaces having a number of wheels, an end effector, an electromagnetic clamping device, first, second, and third coil systems, and a core. The end effector performs operations on a workpiece. The electromagnetic clamping device has an activated state and a deactivated state. The electromagnetic clamping device further includes a first coil system generating a first magnetic field causing normal forces on the permanent magnet unit and the clamping device; a second coil system generating a second magnetic field causing side forces on the permanent magnet unit; and a third coil system generating a third magnetic field causing a rotational force on the permanent magnet unit. The core provides access to the workpiece surface for performing operations thereon; and concentrates forces from a number of magnetic fields on the core surface contacting the workpiece surface.

Abstract: This device temporarily suspends a solid elastic sphere over a specific location. The sphere is composed of evenly dispersed high performance anisotropic powder bonded to an elastic polymer. Levitation of the sphere occurs with an optimized levitation by means of permanent magnets. The equilibrium is stable along one or two axis by means of these permanent magnets, and along one or two others by means of a combination of electromagnets of near zero consumption at equilibrium.

Abstract: An exemplary electromagnetic coupling device includes an electromagnet and a vane member that is selectively magnetically coupled with the electromagnet. A non-magnetic slider layer is supported on one of the electromagnet or the vane member such that the slider layer is between the electromagnet and the vane member. The slider layer maintains a spacing between the electromagnet and the vane member. In a disclosed example, the electromagnetic coupling device is used for coupling an elevator car door to a hoistway door for moving the doors in unison between open and closed positions.

Abstract: The magnetic fixing device comprises a clamping plate having a fixing surface to which a clamping object is fixed and plural magnetic force generation mechanisms. The magnetic force generation mechanisms each comprise a magnetic material member facing the fixing surface, plural permanent magnets arranged around the outer periphery of the magnetic material member, a first Alnico magnet placed on the back of the magnetic material member, and a first coil for switching the polarity of the first Alnico magnet, and can be switched between the absorption state in which the clamping object is adsorbed and the non-absorption state in which the clamping object is not adsorbed. An operation state indication mechanism capable of presenting an indicator indicating that the plural magnetic force generation mechanisms are in the absorption state or in the non-absorption state is provided on the fixing surface or outer periphery of the clamping plate.

Abstract: The present invention provides a cylindrical magnetic levitation stage which includes a cylindrical substrate used to form micro-patterns of various arbitrary shapes on a large-area semiconductor substrate or display panel substrate, a cylindrical substrate, a combination of a first permanent magnet array and a first coil array and a combination of a first permanent magnet array and a first coil array, which are coupled to the cylindrical substrate, so that levitation, axial translation and rotation of the cylindrical substrate can be made finely through the control of a magnetic force generated by the interaction between a magnetic field generated by electric current applied to the coil arrays and a magnetic field generated from the permanent magnet arrays corresponding to the coil arrays.

Abstract: An exemplary magnetic clamp holder used for a mechanical arm, includes a housing (21), a magnetic structure (22), and two positioning pins (25). The housing includes an attaching portion (211), and a joining portion (213) fixed to the attaching portion, the attaching portion and the joining portion cooperatively defining a receiving cavity (218). The positioning pins are disposed on the attaching portion of the housing. The magnetic structure is received in the receiving cavity. The magnetic structure includes a permanent magnetic module (223), an electro-magnetic module (225), and a magnetic shield plate (227) disposed between the permanent magnetic module and the electro-magnetic module. The electro-magnetic module is able to create a magnetic field for neutralizing a magnetic field created by the permanent magnetic module.

Abstract: A stack of ferromagnetic sheets is gripped, lifted, and transported by first engaging with an uppermost sheet of the stack a plurality of magnet assemblies of a magnetic grab, each assembly having at least one electromagnet, then electrically energizing the electromagnets and lifting the stack with the grab while monitoring a magnetic flux of each electromagnet. A controller then compares the fluxes of the electromagnets, and varies the electrical energization of at least one of the electromagnets such that the fluxes of all the electromagnets are generally equal. The system has at least one flux sensor on each of the magnet assemblies and connected to the controller.

Abstract: A permanent electromagnetic indexing apparatus includes a chassis, a carrier pivoted to the chassis, and a plurality of magnetic sets. Each of the magnetic sets includes a first permanent magnet, a magnetic-conductive member, a second permanent magnet, and a magnetizing coil. Each of the first permanent magnets is mounted to the magnetic-conductive member. Each of the magnetic-conductive members is mounted onto the second permanent magnet. Each of the magnetizing coils surrounds the second permanent magnet. The magnetic sets are mounted to the carrier to enable the magnetic-conductive members to become a working surface for placing a workpiece thereon. When each of the magnetizing coils is electrically conducted, the polarity of each of the magnetic-conductive members can be changed and then the workpiece can be fixed to or removed from the working surface. In this way, the workability can be enhanced to enable preferably flexible and variable processing.

Abstract: A magnet controller supplied by an AC source controls a lifting magnet. Two bridges allow DC current to flow in both directions in the lifting magnet. During “Lift”, relatively high voltage is applied to the lifting magnet until it reaches its cold current. Then voltage is lowered. After a desired interval, once the magnet has had time to build its electromagnetic field, voltage is further reduced to prevent the magnet from overheating. The magnet lifting forced is maintained due to the magnetic circuit hysteresis. During “Drop”, reverse voltage is applied briefly to demagnetize the lifting magnet. At the end of the “Lift” and the “Drop”, most of the lifting magnet energy is returned to the line source. A logic controller controls current and voltage of the magnet and calculates the magnet's temperature. In one embodiment, a “Sweep” switch is provided to allow reduction of the magnet power to prevent attraction to the bottom or walls of magnetic rail cars or containers.

Abstract: A switch type ON/OFF structure for hoisting magnetic disks has a handle turnable towards one side to demagnetize and towards another side to generate a magnetic force to attract and move a work piece. The handle is hinged on one end surface of a hoisting magnetic disk which also has a first detent member and a second detent member. The first and second detent members can stop the turning of the handle. The handle further has an extensible latch member at one side spaced from the handle at a selected interval. The latch member has a distal end slidable over the second detent member and extendable downwards to allow the second detent member to be wedged in the interval and anchored. Thereby the hoisting magnetic disk can provide the magnetic attracting force and hoist and move the work piece safer.

Abstract: This invention provides a jack system (2) provided with a cylinder (14) provided with stop means (32). It also comprises: a body (36) hinged about an end (18) of the piston, the body comprising stop means (54) and being able to occupy a first angular position authorising the extraction of the piston, as well as a second angular position uniquely allowed when the piston occupies a position such that the means (54) are located beyond the means (32) in an extraction position (34), the body occupying the second position providing the facing of means (32, 54); and an electromagnetic attraction/repulsion device (64) designed to provide the displacement of the body (36) from the first position to the second position, and inversely.

Abstract: A magnet arrangement for a magnetic levitation vehicle is described. The magnet arrangement comprises a plurality of magnet poles (11) being combined to form groups (11a to 11f), wherein according to the invention each group contains one magnet pole (11a to 11f) or two magnet poles (11a to 11f). The windings (12a to 12f) of each group are controlled by a control circuit (18) individually assigned to it (FIG. 8).

Abstract: An apparatus for levitation of an amount of conductive material including a coil for keeping the material in levitation using a varying electric current in the coil. The apparatus has two coils, a first coil and a second coil, both coils generating an alternating electromagnetic field during use, the alternating electric field of the first and the second coil counteracting each other. The first and second coils are positioned such that the conductive material kept in levitation between the first coil and the second coil is evaporated. A method for generating an amount of levitated conductive material is also disclosed.

Abstract: A load-lifting magnet for lifting, turning, and transporting a wound body comprising a soft-magnetic material, in particular a coil, with a plurality of magnetic poles. In accordance with the invention, magnetic poles are arranged at right angles to each other on a common support body so that they can hold both one end face of the wound body as well as the surface and in that the support body has a rotating apparatus that permits 90° rotations of the wound body while it is suspended.

Abstract: The disclosure relates to a locking system with an electromagnet and a yoke plate that closes the magnetic circuit of the electromagnet. In the latter, the electromagnet is fastened with a fastening element to pivot around a point on a central axis and is tightly fastened in the longitudinal direction of the central axis. Said central axis runs perpendicular to the contact plane between the electromagnet and the yoke plate and through the center of the holding force of the closed electromagnet. As a result, a force that acts against the magnetic force to detach the yoke plate from the pole surface always acts coaxially with the magnetic force, thus keeping the yoke plate from being detached from the pole surface on one side.

Abstract: A permanent magnet chuck for holding or lifting workpieces is formed of two overlying/underlying flat surfaced chuck layers having a common center of rotation. In each chuck layer an even number of permanent magnet plates radiate from the center of rotation at equal angles with blocks of magnetically soft material between them. The permanent magnet plates are magnetized so that the interposed soft magnet blocks exhibit alternating N-S magnetic polarities. The organization of the permanent magnet plates and soft magnet bodies is matching and complementary so that relative rotation of the chuck layers magnetically activates or de-activates the chuck.

Abstract: A retractable magnetic sweeper includes a shell member, a retractable tubular member, a moving member, a connecting bar member, and a magnetic member. The shell member defines a receiving space. The retractable tubular member includes a lower tubular section connected to the shell member, and an upper tubular section mounted slidably on the lower tubular section. The moving member is mounted on the upper tubular section. The connecting bar member is mounted axially within the retractable tubular member, and includes an operating end portion extending into the upper tubular section and connected to the moving member, and a connecting end portion extending into the lower tubular section. The magnetic member is mounted in the receiving space, and is connected to the connecting end portion. The moving member is operable to move the magnetic member downward to an operative state, and upward to a non-operative state.

Abstract: An improved electromagnetic work coil for use with an electromagnetic force machine that produces a pulling (tension) force on a conductive panel work piece. The electromagnetic work coil comprises a coil with insulated conductor windings passing through a clamped stressing region. The work coil further contains mating terminals and is encapsulated in a nonmagnetic housing. A clamp on the stressing region comprises two clamp surfaces and a part in tension outside of the stressing region to tangentially compress the windings in the stressing region. The preferred embodiment the winding paths around the stressing region are made symmetric to provide a centered linear pulling area with a symmetric magnetic field. The conductor windings are tapered that increase in height and width outside of the stressing region to improve thermal and electrical conductivity and decrease the magnetic field outside of the stressing region.

Abstract: A method of testing whether a magnetic lifting device may safely lift a particular load where the magnetic lifting device is placed adjacent to the load, some or all of the magnetic elements of the magnetic lifting device are spaced such that the lifting ability of the magnetic lifting device is reduced by a predetermined amount. An attempt is then made to lift the load by a small safe distance. If this attempt is successful, the user can be sure use of the magnetic lifting device, when the lifting ability is restored, is safe. Conveniently, the spacing is achieved by the introduction of a substantially planar member between the magnetic lifting device and the load. The planar member has a similar footprint to that of the magnetic lifting device. The planar member may be made of stainless steel.

Abstract: An electromagnet consists of an external case 1 enclosing a first solenoid 2 inside which there are concentrically arranged an internal case 3 enclosing a second solenoid 4 wound around a pole core 5, said elements being closed at the top by a cover 6 and at the bottom by a ring 7 of nonmagnetic steel and by a pole shoe 8. A central aperture 9 extends across the full height of the electromagnet through cover 6, core 5 and pole shoe 8 and allows to deviate into pole shoe 8 the flux lines which tend to close at infinity. In this way the scrap pick is more compact and more evenly distributed, and the formation of cusps in the remaining scrap is reduced so as to shorten the time of operations such as the unloading of wagons, caissons, containers and the like.

Abstract: The invention relates to a holding apparatus for the transport of conveyed items, in particular the lifting, transporting, imbricating and stacking of ferromagnetic conveyed parts having at least two permanent magnets for generating a permanent magnetic field, at least two electrical magnet coils for generating a temporary magnetic field and compensation of the permanent magnetic field and a magnetically conductive housing. The permanent magnet is magnetized in the direction of its smallest dimension (l3) and is arranged in the direction of magnetization (M) at the rear with one pole (N, S) against the housing, forming a magnetic yoke, and at the front with the other pole (S, N) in the direction of a working clearance opposite the conveyed parts. The housing in cross section has three or more webs rising up from a baseplate and permanent magnets in each case fastened at the top in the region of the working clearance.

Abstract: In the switchable magnet system disclosed herein, a central pole piece is backed by at least two permanent magnets having substantially different energies (Hc) so that one of the magnets is relatively switchable or reversible and the other is not. A magnetically permeable frame provides a peripheral pole face at least on either side of the central pole face and a backing plate bridging the central pole piece over the permanent magnets. A coil surrounds the first and second permanent magnets insde of the peripheral pole face. According, energization of the coil in one direction can reverse the polarization of the first magnet, thereby effectively short circuiting flux produced by the second magnet and terminating holding, while energization of the coil in the opposite direction can polarize the first magnet in parallel with the second magnet, thereby to effect holding.

Abstract: An electromagnet having one or more coils wrapped around a plate-shaped core produces a uniaxial magnetic filed in the vicinity of a substrate surface for orienting a magnetic film deposited onto the substrate surface. Variations in the magnetic mass of the plate-shaped core or in the magnetic permeability of the core mass are made to reduce angular skew and to improve uniformity of the uniaxial magnetic field. The variations generally involve a reduction in magnetic mass or permeability near a center of the core with respect to a periphery of the core. Cavities of various sizes and shapes but having symmetry with a magnetic axis can be formed in the core for this purpose.

Abstract: A composite magnet having a steel back plate on which an inner section of a first magnetic material having a high residual magnetic strength and an energy product greater than 25 million and preferably 35 million G-Oe or greater is positioned. Although possessing such high residual magnetic strength, the first magnetic material contained in the inner section comprises less than 1/8 the entire volume of the composite magnet. A barrier surrounds the inner section, and an outer section of a second magnetic material abuts the barrier and surrounds the sides of the first magnetic material. Such second section of magnetic material has a low residual magnetic strength (i.e., 3,800-4,000 G), and an energy product greater than 3 million G-Oe.

Abstract: A lifter comprising at least a reversible magnet (5, 5') arranged with its polarities oriented along a vertical axis above at least a magnet (6, 6') provided with at least a pair of permanent magnets (6a, 6a') arranged with the polarities oriented along an horizontal axis on the sides of at least a ferromagnetic core (6b, 6b') suitable to contact the load (18) to be lifted, at least a magnetic sensor (11) arranged close to the base (6c, 6c') of said ferromagnetic core, and a further magnetic sensor (12) arranged over said permanent magnets (6a, 6a') so as to measure substantially only the magnetic flux passing through the reversible magnet (5, 5'), as well as a safety device (13) for processing the signals transmitted by said magnetic sensors (11, 12) and obtaining the working point of the lifter on the magnetization curve (14) of the reversible magnet (5, 5').

Abstract: In the switchable magnet system disclosed herein, a central pole piece is backed by at least two permanent magnets having substantially different energies (H.sub.c) so that one of the magnets is relatively switchable or reversible and the other is not. A magnetically permeable frame provides a peripheral pole face at least on either side of the central pole face and a backing plate bridging the central pole piece over the permanent magnets. A coil surrounds the first and second permanent magnets inside of the peripheral pole face. According, energization of the coil in one direction can reverse the polarization of the first magnet, thereby effectively short circuiting flux produced by the second magnet and terminating holding, while energization of the coil in the opposite direction can polarize the first magnet in parallel with the second magnet, thereby to effect holding.

Abstract: Disclosed is an electromagnet design that can be quickly disassembled, repaired, and reassemble. In one embodiment the electromagnet comprises a housing having a housing cavity. Carved or molded into the housing is a pair of opposing slots. An electromagnetic core comprising a ferromagnetic material wrapped with electrical wire is disposed within the housing cavity. A pair of braces are lodged within the slots in the housing cavity such that they overlap the electromagnetic core. A center shoe engages the braces and is secured to the housing by six bolts. The slots, braces, and center shoe design cooperate to secure the electromagnetic core within the housing cavity.

Abstract: A vehicle mounted electromagnetic jack system attachable to a vehicle for lifting portions or all of a vehicle. The system includes four electromagnetically operated jacks, a main console located within the vehicle, which operates each jack selectively or all collectively for total lift. Each jack consists of a pair of electromagnets proportionately spaced wherein the lifting force is provided by the coupling intensity of the magnetic flux field propagated from each electromagnet, having confronting poles of like polarity, wherein the well-known repelling effect between like magnetic poles urges the poles apart to furnish the lifting force. Current controlled by the Control Panel, located within the vehicle, reverses the current to the Lower Electromagnet, causing a 180.degree.

Abstract: A magnetic lifting device having a load lifting magnet with at least one magnetic coil arranged in a housing. A driven synchronous alternator is arranged in a housing for generating a voltage supplied to the magnetic coil. A supply line leading from the alternator to the magnetic coil supplies direct current to the magnetic coil. An electrical switching circuit with a control line arranged within the alternator housing connects to a control switch outside the alternator housing through a further control line outside the alternator housing. The control switch actuates a first rectifier connected to the alternator for powering the coil of the magnet. It also deactivates the magnet by powering a second rectifier of a reverse polarity to release the magnet load. The control switch also includes an overload signal and alarm, and a ready light when the magnet is ready to be powered.

Abstract: An electromagnetic pick-up device for use with a forklift or other vehicle having a power lifting mechanism thereon, wherein the device is adapted to be easily picked up by the lifting mechanism and is completely self-contained and electrically powered such that it can be transported and manipulated by the vehicle into tight areas, wherein electromagnets are pivotally, swingably mounted on the forward end of the device and are substantially positioned beyond the forward end, whereby the device is particularly suited for picking up difficult-to-handle metal pieces which normally present handling dangers, and which is adapted to be easily released from the vehicle without any need for disconnecting any electrical, hydraulic, or the like power transmitting equipment from the vehicle.

Abstract: A method and device for detecting full magnetization of an electro-permanent magnet which includes at least one permanent magnet part and at least one coil. Current is passed through the coil over a certain period of time in order to magnetize the electro-permanent magnet. The current through the coil of the magnet is measured during magnetization, and an increase of the derivative of the current curve is detected. A signal is given to an operator or computer if an increase in the current derivative is detected, which indicates full magnetization of the electro-permanent magnet.

Abstract: The specification discloses a magnetizable device for engaging articles of varying surface contours. The device is characterized by a number of independently movable magnetizable elements which depend from a slot in the device housing; the elements being retained by element-arresting projections extending from each element's upper-most end. In one embodiment, the slot of the present invention is a bobbin assembly, including first and second halves which join to define a substantially rectangular slot.

Abstract: A marker applying device (50) for a substrate (14) having a plurality of markers (70) having magnetic material (74) in a backing (72) of the markers (70), and an adhesive (76) on a front surface (78) of the backing (72), a marker retainer (62) having a relative weak magnetic force at spaced locations (64) for releasably retaining the markers (70) at the spaced locations (64) in a configuration with the adhesive (76) facing outwardly from the retainer (62), an electromagnet (88) positioned with the substrate (14) being intermediate the electromagnet (88) and retainer (62), and the markers (70) being sequentially positioned by the retainer (62) in a configuration with the adhesive (76) facing the electromagnet (88) and substrate (14), and a device (CPU) for electrically pulsing the electromagnet (88) to produce a relatively strong magnetic force, such that the electromagnet (88) removes the markers (70) from the retainer (62) and deposits them onto the substrate (14) such that the adhesive (76) on the markers (

Abstract: An electromagnet is provided having a housing and a coil disposed therein. The coil comprises three strips of material placed adjacent one another in an interleaved fashion. The coil comprises a strip of insulation, a magnetic strip, and an electrical conductor strip. The magnetic strip extends radially for only a portion of the coil. The electrical conductor strip comprises two separate materials. In one embodiment, the electrical conductor strip comprises a segment of bare copper, and a segment of bare aluminum.

Abstract: A levitating support and positioning system (10) is provided for orienting an electromagnetic energy reflecting assembly (40). System (10) includes a reflective member (60) supported by an annular ring (50) having a plurality of superconductors (70) disposed thereon. Ring (50) is levitated above a base surface (20) by means of a plurality of electromagnetic assemblies (30), each of the electromagnetic assemblies (30) corresponding to a respective one of the plurality of superconductive elements (70), whereby the magnetic fields generated by the electromagnetic assemblies (30) are repelled by the respective superconductive elements. The orientation of the support ring (50), and the reflector therewith, is adjusted by changing the relative magnetic field strength between each of the electromagnetic assemblies (30), allowing the reflector to be directed in both elevation and azimuth.

Abstract: A magnetic gripper avoiding the disadvantages of the well-known devices of reduced lifting capacity, increased electric power consumption and small gripping force finds application in mechanical engineering for the transportation of ferromagnetic materials. The device has a U-shaped casing of magnetic soft material, at least two pairs of permanent magnets, one of their ends resting on the casing and the other on a common pole terminal enveloped in a neutralizing winding and all magnets are enveloped by a magnetizing winding. The magnetic gripper can lift thick sheets and packs of thin sheets when short-time current pulse of the magnetizing winding is fed and the permanent magnets are magnetized in one direction, the magnetic flux formed is collected in the common pole terminal. To free the sheets, a current pulse of the common neutralizing winding is fed and the direction of magnetization is reversed.

Abstract: Permanent magnetic retaining device to move, affix or carry ferromagnetic parts or load with electronic switching of the magnetic flux to release the carried load includes a central iron core enclosed by a pair of magnet blocks secured by iron shoes, laterally joined to reinforcing plates and terminated by lateral poles with one or more compensator coils being disposed on the central core, with a sliding cover above the former, moving on a pair of guide pins surrounded by mechanical force gauges, the cover being centrally provided with a lifter eyelet. An electronic control circuit is incorporated externally in one of the side walls of a rectangular enveloping overcover wherein, at the opposite side thereof, a sensor of the electronic circuit is incorporated, to be operated manually and/or by remote control.

Abstract: A movable yoke-type lifting magnet device including a core having first and second ends and at least one yoke provided so as to be movable relative to the core in a vertical direction at each of the first and second ends of the core. A movable framework and a drive member for driving the movable framework relative to the core are further provided for lifting and lowering each yoke relative to the core. When the movable framework is driven upwards, the movable framework engages with each yoke and forcibly lifts each yoke. When the movable framework is driven downwards, the movable framework releases the yokes to allow them to move downwards by their own weight and to be gently brought into contact with a workpiece to be lifted.

Abstract: A fixture for locating a workpiece in a precisely established position comprises a lower magnetic base and an upper fixture plate, the workpiece being fixtured on the plate. The base includes a permanent magnet which normally clamps the plate to the base but which is disabled and releases the plate when an electromagnet in the base is energized. Prior to clamping the plate to the base, the plate is located in a precise edgewise position on the base by quickly insertable and removable dowel pins adapted to be received by the plate and the base with a precision fit.

Abstract: The invention is directed to an electrically controllable permanent magnetic quick break switching system for raising, transporting and stacking ferromagnetic parts. The system includes a magnetized permanent magnet 1 centrally arranged in the direction of its smallest dimension in a magnetically conducting iron support member, on which magnet there sits a magnetically conducting compensation plate 5 having a magnetically conducting bar 3 and magnetically conducting central pole 6 and additionally an electrical coil 4 between the compensation plate and the control pole for compensation (displacement) of the magnetic field from the region of the working air gap 7. For optimum compensation, i.e., of the most extensive delay free releasing of ferromagnetic thick to thinnest parts with simultaneously high forces the structural dimensions of the system are in reciprocal relationships which are individually stated in claim 1.

Abstract: A magnetic anchoring apparatus, comprising in combination: an external ferromagnetic crown provided with a base plate and lateral walls; at least one group of four pole pieces defining pairs of corresponding poles of an anchoring surface, said pole pieces presenting their longitudinal axes at right angles to the base plate and in correspondence with the apexes of a square. The apparatus comprising moreover a plurality of permanent magnets for feeding the aforesaid poles, interposed between the pole pieces and, respectively, between the latter and said ferromagnetic crown.

Abstract: An electromagnet having a 360.degree. flux pattern for attracting magnetizable items over the entire surface area of the magnet is disclosed. The electromagnet includes an outer casing having a circumferential portion constructed of non-magnetizable material, a core portion of magnetizable material, and a means for generating magnetic flux lines contained within the casing. The core is disposed generally radially within the coil and includes an inner core portion and a first magnetic pole portion extending axially from the coil. The first magnetic pole comprises a bottom wall depending from the inner core and being radially coextensive with at least a portion of the coil. The core also includes a second magnetic pole portion extending axially from the coil opposite of the first magnetic pole portion and comprising a top wall depending from the inner core which is radially coextensive with at least a portion of the coil.

Abstract: A lifting magnet assembly is disclosed which has a permeable magnetic case with a central core and an outer peripheral wall. Electrical winding means surrounds the coil and is inside the outer wall. A composite magnetically permeable case top is provided in the magnet assembly, the composite case top including a cast steel member and a uniform thickness top plate welded together. The composite case top is welded to the core and to the outer peripheral wall, and the cast steel member is generally in the form of a spider with a plurality of arms extending from a central annular portion. This cast steel member performs the triple function of stiffening the steel top plate, providing the connector means to the lifting chain, and providing a flux path supplemental to the top plate for the magnet flux. A single size of cast steel member may be used for a plurality of sizes of magnet assemblies.

Abstract: This specification discloses a solenoid actuator which combines a fast response with a high force capability. A multitude of magnetic poles act in parallel to create a traction force which is a function of the number of magnetic poles and with fast dynamic response which is independent of the magnitude of the force and the size of the solenoid.

Abstract: A lifting magnet for warm steel slabs and the like incorporating means for cooling the metallic shell of the magnet to prevent damage to coil insulation due to overheating.