Abstract: When an electromagnet (2) is employed to lift and turn a slab of steel, there is a risk that the slab is dropped, causing undesirable noise. Also, with a flat contact surface of the electromagnet, there is jerking of the apparatus. Improvement in both respects is achieved by the use of a singly curved convex contact surface (7) of the electromagnet, which provides line contact with the slab at all times, avoiding transitions from line contact to face contact.

Abstract: A coil for an electromagnet is made up of a spiral wound, anodized aluminum strip, and a strip of magnetic material wound in interleaved fashion with the central portion of the aluminum strip. The magnetic material strip is electrically insulated from the aluminum strip and the aluminum strip is electrically energized to excite the magnet. The magnetic material strip is wider than the aluminum strip and extends beyond both opposite edges of the aluminum strip to make direct contact with the coil housing and a pole shoe. Electrical insulating material fills the cavity defined by the magnetic strip projecting beyond the edges of the aluminum strip.

Abstract: An electromagnetic lifting device comprising a plurality of electromagnets having a variety of individual magnetic pole face areas and an inverted generally U- or W-shape connected with each other and further rigidly connected to a suspension member, and specifically adapted to electromagnetically lift up only a single sheet of ferromagnetic metal sheet by energizing a selected one or plurality of the electromagnets to an extent of necessary and enough electromagnetic energy in accordance with a thickness of the single sheet of metal and exerting thus-produced electromagnetic force to that single sheet of metal so that only that single sheet of metal can be lifted upwardly away from a pile of such metal sheets.

Abstract: An electromagnetic lifting device is provided with a pole piece of tapered or conical configuration extending outwardly from the load contacting surface of the magnet body. The tapered or conical configuration of the pole piece extends the effective magnetic flux pattern outwardly of the magnet body and also enables the pole piece to penetrate more readily into a collection of loose ferrous articles which are to be lifted.

Abstract: Magnetic apparatus for securing ferromagnetic pieces to lifting equipment, conveying devices and machine tools. The apparatus comprises a first nonreversible magnetopermanent core; a second reversible magnetopermanent core coacting with the former on a same magnetic yoke defining part of the work securing surface, and a solenoid wound about said reversible core and supplied with direct current in either direction for a period of time sufficient to cause said reversible core to follow a portion of the hysterisis loop thereof to generate an electromagnetic field for inverting the polarization of said core, thus enabling respective activation or deactivation of the work securing surface.

Abstract: The lifting magnet disclosed herein is adapted for lifting layered pipe. The pipe is engaged by a pair of elongate pole pieces which extend transversely to the length of the pipe, the pole pieces being energized by at least one coil disposed therebetween. The pole pieces are of essentially uniform thickness over most of their length but have substantially thicker portions adjacent each end so as to provide, to a pipe contacting the ends of the pole pieces, an approach flux path of cross-sectional area substantially equal to the cross-sectional area of the approach flux path presented to a pipe contacting the pole pieces intermediate their ends.

Abstract: An electro-magnet or chuck for lifting scrap metallic particles, comprising a housing essentially of magnetic material. Enclosed are a plurality of spirally wound, superposed coils. Each coil has a central portion which is wound as a bimetal, that is, one winding having magnetic properties, such as an iron winding, and the other, non-magnetic, such as an aluminum winding in series with an outer winding portion of non-magnetic turns. The housing has an annular bottom portion of durable non-magnetic material, such as stainless steel, which is magnetically bridged by scrap magnetic particles being lifted.