Abstract: In the rotor of an electric machine, in particular a motor-generator set for pumped storage units, the rotor body (6), which is constructed from laminated metal sheets, is held together by axially extending clamping bolts (8). The rotor winding (16) is inserted in slots on the outer circumference of the rotor body and held there against the effect of centrifugal force. The winding ends (16a), which emerge axially from the rotor body and form the winding overhang (17), are secured against the effect of centrifugal force by radially extending stud bolts (37) which are screwed into a support ring arrangement (19, . . . , 24). The support ring arrangement comprises a plurality of rings (19, . . . , 24) spaced apart in the axial direction. The rings in the section near the axis of the rotor body are clamped together together with the press fingers (30) by means of the tension bolt (8) axially penetrating the rotor body.

Abstract: A clamping frame for a transformer core has a clamping frame part and a tensioner. The surfaces of the tensioner and of the clamping frame part abutting the transformer core lie in a common plane. The tensioner features an engagement part, which engages in a recess of the clamping frame part.

Abstract: A choke coil comprises mutually similar flat bars which are electrically connected at the corners. Each coil winding comprises an integral number of mutually similar flat bars which in each case lie on top of one another on contact areas at the corners so as to overlap over a large area. Insulating plates and/or insulating layers having a size approximately equal to the contact area are provided between two adjacent windings at the corners. The stack formed in this way is held together exclusively by means of a clamping device comprising clamping elements which do not cut or pierce the flat bars. A choke constructed in this manner is simple and economical to manufacture can be cooled well and can be produced in virtually any size.

Abstract: A substation transformer is disclosed which includes a winding, a winding compression ring, which closes off the winding, a compression beam, and expanding spring elements. The expanding spring elements are disposed concentrically around a core portion of the winding, and are placed between the compression beam and the winding compression ring. Each of the spring elements includes a spring, a bushing receiving a spring, and a compression piston which has been provided to close an open end of the bushing. The compression piston is adapted to limit movement of the spring. A post-installation modification mechanism is provided which includes a compression mechanism for compressing the winding. The compression mechanism comprises hydraulic cylinders adapted to be removably inserted between the compression beam and the winding compression ring.

Abstract: An ignition coil device for an internal combustion engine includes an air gap between the two heat generating sources, the coil assembly and the power transistor unit, such that the coil assembly and the power transistor unit are thermally isolated from each other. Further, the primary winding bobbin has an inner projection inserted into the air gap of the core to maintain the gap. Furthermore, the primary winding bobbin and the secondary winding bobbin each has a first and a second bobbin attachment portion. First the high voltage tower attachment portion of the high voltage tower is engaged with the bobbin attachment portion on the secondary winding bobbin and the connector attachment portion of the connector is engaged with the bobbin attachment portion on the primary winding bobbin, to form respective integral sub-units.

Abstract: An electrical noise absorber comprising a magnetic body like ferrite attached around a flat cable and a fixing member. The fixing member comprises an inserting portion having a through hole for passing the magnetic body therethrough. Opposite walls defining the through hole extend in the direction, in which the magnetic body is inserted, to form a pair of cable fixing arms. Each of the cable fixing arms has a slot and projections for engaging the side edges of the flat cable. Engaging portions for engaging the periphery of the magnetic body inserted into the fixing members are provided on the top and bottom of the inserting portion. The flat cable and the magnetic body can thus be held immobile by the fixing members of the electrical noise absorber.

Abstract: A combination of a fastener with an electronic component, wherein the electronic component includes a bobbin having an axial portion, windings around the axial portion of the bobbin, external terminals projecting from the bobbin, around each of which external terminals a termination of one of the windings is coiled, a mold covering the bobbin in a manner to allow portions of the external terminals to be projected outwardly from the mold, the mold being formed of electrically insulating resin material, and a pair of cores assembled to the mold so as to be opposed to each other. The fastener fitted on the electronic component includes a first engaging member engaged in assembly with the cores to clamp the cores, a second engaging member engaged in assembly with a portion of the mold, and an interconnecting member interconnecting the first and second engaging members.

Abstract: A superconducting transformer comprises primary and secondary superconducting coils which are coaxial and made of superconducting wires, and a cryostat for maintaining the superconducting coils in a superconducting state. The cryostat includes a vessel for containing refrigerant and which is formed of a ferromagnetic material. The coils are immersed in the refrigerant. Rod formed of ferromagnetic materials is inserted in the primary and secondary superconducting coils, and is magnetically coupled with the vessel. The cryostat also includes a heat insulating tank for thermally insulating the rod and the vessel from the refrigerant. The rod and the vessel together form a closed magnetic circuit, and function as a core for the superconducting coils.

Abstract: An electromagnetic relay 38 (FIG. 2) includes a cylindrical core 42 concentrically positioned within a coil assembly 40 and press fit into a frame 50, a resiliently mounted armature assembly 56, and electrical contacts 66,68, one mounted on the armature assembly 56 and one disposed in a fixed relationship to the frame 50. The coil assembly 40 is secured to the frame 50 by the use of extrusions 54 which precludes the need for a core head 24 and crush ribs 26 (FIG. 1). After assembling the relay 38, the core 42 is positioned by pressing the armature assembly 56 directly opposite the core 42 until the core 42 travels a predetermined distance beyond the electrical contact point for the contacts 66,68. This invention ensures precise positioning of the functional components and negates the accumulation of manufacturing tolerances in the relay 38.

Abstract: An ignition coil comprises at least one magnetic assembly, each of which has a central magnetic core, around which two formers, namely a primary and a secondary former, are arranged coaxially. The formers carry the primary and secondary windings respectively, and the magnetic assembly further includes retaining means adapted to position and secure the primary former within the secondary former. These retaining means comprise steps formed integrally in a tubular cavity of the secondary former and cooperating with one of the end plates of the primary former.

Abstract: A variable speed, constant frequency generating system has a neutral forming autotransformer connected between a variable speed generator and an AC to AC converter. The converter includes a three phase, full wave rectifier with positive and negative rails connecting the rectifiers with a DC to AC inverter. Each turn of the transformer windings has at least one surface exposed to air for cooling.

Abstract: A compressed-air cooled transducer coil assembly for slag detector apparatus includes a refractory shield, top and bottom end blocks, a coil winding, and at least two spaced-apart guide bars. The shield may be positioned to coaxially surround the pour tube of a continuous steel caster so as to leave a space therebetween. The end pieces are connected to the shield. The coil winding is connected to the end blocks and is positioned so as to coaxially surround the shield leaving an air gap therebetween. The guide bars each have a bore whose lower end is attached to the bottom end block and whose middle portion projects into the space between the shield and the pour tube. The top and bottom end blocks have conduits which communicate with the air gap and the bores.

Abstract: A compact valve choke that is simple to manufacture, which can, however, ensure the qualities required for all operating modes, namely the needed dielectric strength and freedom from partial discharges between components that are at different voltages. This valve-choke is achieved by having: the choke windings arranged in a supporting frame in a self-supporting manner, in relation to one leg of the choke core; the choke windings potted on all sides, and the potted block supported in the supporting frame by means of fittings; the choke core consists of two generally circular-shaped cores and is secured in the supporting frame; and the choke coil includes two primary windings wound in two layers, with an outer first winding portion and a concentric inner second winding portion as well as, a core-potential center tap roughly in the center of the windings between the first winding portion and the second winding portion.

Abstract: Mounting for ignition module in which a ferromagnetic flux carrying core includes a plurality of spaced, parallel leg portions. The ignition coil module has a generally central opening which is adapted to receive one of the core legs. A tapered slot is formed on one side of said coil module and is adapted to receive a correspondingly tapered bar portion of a synthetic plastic retainer. The retainer is an integral, thermoplastic block with a channel on the side opposite the tapered bar portion adapted to slide-fit about the inner edge portion of the core leg. A recess is provided in the leg of the core opposite the slot on said module. The retainer includes a frangible lug portion which is adapted to be displaced against the portion of the leg in which the recess is formed. Whereupon, when the lug is softened by ultrasonic energy, it flows into the recess and hardens therein while bonding to the contiguous portions of the retainer to fasten the module in fixed assembled relation on the core.

Abstract: A transformer comprises a tank containing insulating liquid, and within the liquid there is an amorphous-alloy laminated core that comprises spaced-apart upper and lower yokes and two spaced-apart legs at opposite ends of the yokes. Coil structure surrounds the legs, locating the yokes outside the coil structure. Box-like enclosures primarily of electrical insulating material respectively enclose the yokes in positions outside the coil structure. The enclosure about the lower yoke is positioned to capture therein chips of amorphous alloy which might become detached from said core and fall toward the bottom of the tank.

Abstract: This transformer comprises a generally rectangular core having two yokes and two legs connecting the yokes, with joints located in one of the yokes. Coil structures surround the two legs. Flexible banding under tension applies clamping forces to two clamping plates spaced outwardly from the yokes, and these clamping forces are transmitted to the coil structures by paths bypassing the core. The banding extends alongside the legs and is oriented so as to engage the core at opposite ends of said one yoke but so as to be spaced from the core at opposite ends of the other yoke.

Abstract: A coil assembly includes a first winding for circumferentially surrounding at least a portion of a leg of a transformer core, a second winding spaced from and circumferentially surrounding at least a portion of the first winding, first supports, such as axially extending insulative rods, disposed between the first and second winding, for inhibiting axial motion of the second winding relative to the first winding and a second support disposed about at least a portion of the outer periphery of the second winding for inhibiting radial motion of the second winding relative to the first winding. Encapsulating material, such as an epoxy resin having glass fibers disposed therethrough, is disposed between the first winding and the leg, between the first and second winding and disposed about the second support for forming a monolithic structure. In a transformer including such a coil assembly, the leg and conductors forming the windings may be fluid cooled.

Abstract: In the present invention, there is disclosed an electrical induction apparatus having a magnetic core unit being comprised of a toroidal magnetic core and at least one winding wound around the core and a casing for housing the magnetic core unit therein, comprising a support plate for supporting the bottom of the magnetic core unit having at least one opening, means for positioning the unit at a predetermined position in the casing being engageable to the opening of the support plate, a cylindrical member made of an insulating material which is so formed as to fit into the central hole of the unit, a mounting plate for fixing the unit being disposed on the top of the unit, an axial member passing through the central hole of the cylindrical member, one end of which is connected to the supporting plate and the other end of which is projected outwardly in the axial direction thereof, a nut means for fastening the mounting plate to hold the unit between the mounting plate and the support plate which is engageable

Abstract: A transformer formed of a construction effectiving a relatively simple assembly including an L-shaped terminal support mountable in friction-fit relative between the transformer coil and the laminated core, and including terminal plates which are also snap-fit mounted in the support.

Abstract: A transformer comprising an outer coil former (1) having a first outer end portion (13), to which is secured a resilient device (49) which exerts a force on a first core part (47) directed towards a second outer end portion (15) of the outer coil former. Within the outer coil former (1) is arranged an inner coil former (3) having a first inner end portion (25), which is received by a recess in the first outer end portion (13) in a manner such that the resilient device engages only the first outer end portion and the first core part (47) but does not engage the first inner end portion. As a result, the resilient device not only holds the first core part in position, but also prevents the two coil formers (1,3) from moving away from each other.

Abstract: Disclosed is a diagnostic nuclear magnetic resonance apparatus which comprises a pair of coil units having substantially the same construction and a base bearing the coil units. Each coil unit includes a large coil, a small coil, and a frame structure fixing the large and small coils so that the axes of the two coils are in alignment with each other. In the frame structure, a pair of frames, each consisting of four frame members fixed at right angles at each end portion, are arranged at a suitable space. The small coil is removably attached to one of the frames. The large coil is disposed between and fixed to the two frames. The two coil units are joined together so that their respective large coils adjoin each other, and the two frame structures are fixed to each other by means of bolts and nuts. Also, the frame structures are fixed to the base by means of bolts and nuts. The coil units and the base can be separated from one another when transferring and carrying the apparatus.

Abstract: Mounting for ignition module in which a ferromagnetic flux carrying core includes a plurality of spaced, parallel leg portions. An ignition coil module has a generally central opening which is adapted to receive one of the core legs. One recess is provided on the outer surface of the module, and a second recess is provided in the core leg adjacent the one on which the module is disposed. The two recesses are oriented and dimensioned to form complementary portions of an opening adapted to receive a resiliently flexible retaining pin therein to fasten the module and core in assembled relation.

Abstract: A curved, shell-type magnet coil, adapted to be used in a superconducting magnet, is wound by providing a mandrel having a tubular cylindrical mid-portion terminating at both ends in tapered end portions formed with longitudinal slots having flexible fingers therebetween. An elongated electrical conductor is wound around an elongated oval-shaped pole island engaged with the outside of the cylindrical mid-portion, to form a multiplicity of oval-shaped turns engaged with a 180-degree segment of the mandrel. The coil turns have longitudinal portions with curved portions therebetween, engaging the tapered end portions of the mandrel.

Abstract: An axially symmetric air-core choke coil for high voltage applications. The coil includes a plurality of radially concentric, helically wound layers of windings. Non-insulated wire cable is used to produce each winding. Therefore, adjacent turns of each winding, as well as adjacent layers are spaced from one another. Separation between adjacent turns of each layer is provided through longitudinally extending, non-conductive, strips which are circumferentially spaced around the outer periphery of each winding layer. The strips are folded radially inward at the open spaces between turns. The layers are separated by a plurality of longitudinally extending non-conductive bars. The bars can be positioned to overlap the strips. Numerous air gaps are thereby defined between adjacent turns and adjacent layers which allow air to easily flow in a radial direction into the center of the air-core coil.

Abstract: A wedging device comprises at least two bodies which are movable in relation to each other, namely a first body having two diverging surfaces and a second body which is displaceable relative to the first body along one of its diverging surfaces. A heat-shrinkable casing, made for example from a tape, sheet or film of polymeric material, is arranged around the movable bodies of the device. When the device is heated, the casing shrinks, causing relative displacement between the first and second bodies and a consequent change in the outer dimensions of the device.

Abstract: The present invention relates to a method for mounting transformer windings on the core legs. After all the windings for a core leg have been pre-assembled, they are pressed in a separate press to the desired height, whereafter the windings are provided with screw clamps or the like, applicable from the outside, which hold the windings in a compressed position until they have been applied on a core leg and the upper yoke of the transformer has been interleaved and the press beams been mounted. Thereafter, the screw clamps are removed.

Abstract: An electromagnetic assembly includes a core having an inner cylindrical portion and an outer cylindrical portion spaced from the inner cylindrical portion to provide space or a cavity for a bobbin. The bobbin is adapted to fit into the space provided in the core and has an elongated cylindrical body, a coil of wire wound around the body, and a flange at each end of the body for holding the coil on the body. A portion of one flange extends from the bobbin and overlaps a portion of the core. The bobbin is held in the core cavity by an interference fit provided between the overlapping, extended flange portion and the overlapped core portion.

Abstract: A method and structure for restricting relative sliding motion at the interfaces between a superconducting winding and a supporting structure for the winding. An interface lining material having a low shear modulus of elasticity so as to accommodate large shear displacements with low shear stresses is used as opposed to the use of sliding frictional contact between the contacting surfaces of the electrical winding and the supporting structure. The invention is completed by subjecting the lined interfaced surfaces to large compressional pressure forces so that frictional forces between the interface material and the opposing superconducting winding and supporting structure surfaces, even at low coefficients of friction, are considerably higher than the internal shear forces of the interfacing lining material.

Abstract: The winding bars (12) are fixed to the body (20) of teeth (14, 16) whose feet (18) form a dovetail engaged in the stator magnetic circuit (2), the mechanical strength of these teeth being due to the fact that they are constituted by layers of sheathing fabric coated with resin completely wrapped about the foot, body and head of the core of each of the teeth and forming a casing (46). Wedges (28) are driven in radially on the side walls of the teeth whose thickness is substantially constant around a core (40) whose form defines that of the tooth.

Abstract: A rotor end turn winding and support system is disclosed which provides support in the radial, axial and circumferential directions for the end turns of a superconducting rotor field coil. The end turn conductor stack is tilted from a purely radial position to facilitate the winding of the small, flexible conductors of a superconducting rotor.

Abstract: A superconductive coil assembly has a housing formed of an inner shell and an outer shell, and a superconductive coil situated in a space defined between the shells. A plurality of spring elements arranged in a mosaic-like pattern on a surface area of one of the shells between the superconductive coil and the shell. Each spring element has a first flat member being of a material having a relatively small dilatation and a second flat member being of a material having a relatively large dilatation. The first and second flat members are inseparably bonded to one another. The spring elements have an effective thickness that is greater at a relatively low temperature than at a relatively high temperature.

Abstract: A static plate and liquid distribution manifold construction for vertical coils of electrical inductive apparatus, characterized by a plurality of vertically stacked pancake coils, manifold means comprising an inner rigid core of dielectric material, a coating of metal foil on the core, and a flexible bladder enclosing the rigid core and metal foil structure above the plurality of stacked coils, a plurality of radially spaced spacers between the coils and between the top coil and the manifold means, pressure means for compressing the assembly of the manifold means, the spacers, and the coils, an inlet means for introducing a coolant into the manifold bladder whereby the coolant fluid after leaving the manifold is fed by gravity downwardly over the several stacked coils.

Abstract: A device for providing closed ring cores with windings. A coil former is rotatably arranged on at least one core leg. Between the coil former and the leg there is provided a guide member which is secured to the leg and which comprises guide paths for the coil former rotatably arranged thereon. The coil former is fixed in position after a coil is wound thereon.

Abstract: An improved means for mounting the induction coil of an inductively heated, rotatable godet about the magnetic core thereof so as to prevent internal overheating and preferably also to avoid any movement or play between the core and the coil as caused by heat expansion and vibration during operation of the godet. The improvement comprises cooling means for cooling the laminated pack acting as the magnetic core and for thermally isolating the pack from the coil and outer godet shell or casing, said cooling means including at least one hose-like tube wound around the laminated pack with means to conduct a fluid coolant therethrough. An elastic intermediate member is preferably introduced at some point between the coil and magnetic core in order to compensate for any unequal thermal expansion of these elements in the axial and/or radial directions.

Abstract: Certain windings in a transformer are subjected to radially inwardly-directed forces while being short-circuited. If such a winding is not sufficiently stable itself, particularly with respect to tape windings, or does not have sufficient support radially outwardly or inwardly, it will buckle or break. To prevent such an occurrence, it is possible to arrange an outward support around the winding by completely or partly filling up the space between the winding, which is subjected to buckling stress, and a second winding positioned outside the first winding. Additionally, there is required an inner supporting cylinder, which is preferably made of metal, so that it can be made relatively thin.

Abstract: An improved normal or superconductive field coil constructed so that individual coils are both axially and radially stable. The individual coils are provided with a holding cylinder at each end with the conductor ends being fixed to the holding cylinder. In another embodiment an electrically insulating, reinforcing cylinder is fixed to the outer periphery of the coil.

Abstract: A device for effecting mechanical prestressing in a pair of substantially concentric cylinders, in which the inner cylinder is prestressed in compression and the outer cylinder is prestressed in tension by means of the device in the form of a hose or hoses disposed in a gap between the cylinders and being subjected internally to a pressure medium, the hose or hoses being arranged helically in such a manner that the sum of the moments of the forces thereby caused by the pressure forces between the cylinders and occurring about the central axis of the cylinders in a plane containing such axis, is substantially zero.

Abstract: The invention relates to an electric machine such as a motor having a stator lamination packet with winding heads at opposite ends thereof. A cover for each or either winding head has inner fingers which extend into the grooves of the stator packet and outer fingers with wedge shaped portions which extend between the inner fingers in the installed position. The wedge shaped portions are resiliently mounted relative to the cover proper. The wedge shaped portions have one set of edges engageable with an end face of the stator packet and a second set of relatively inclined edges engageable with the underside of the associated winding head. Circumferentially arranged grooves in the wedge shaped portions hold a ring which biases the outer fingers radially inwardly to bunch the winding head into a predetermined confined space.

Abstract: An improved means for mounting the induction coil of an inductively heated godet about the magnetic core thereof so as to eliminate any movement or play therebetween in operation caused by heat expansion and vibration. The improvement comprises placing an elastic intermediate piece between the coil and magnetic core which compensates for any unequal thermal expansion of these elements. In the preferred embodiment of the present invention, the intermediate piece is constructed of a hose-like hollow chamber through which a coolant under pressure is circulated from an external source.

Abstract: An adjustable transformer core and the method of manufacturing an adjustable transformer core, the transformer including a core and coils, the core being formed from a plurality of lamination sets, each lamination set including a number of legs and a pair of yoke members, the lamination sets being stacked in face-to-face relation so that the legs can be moved relative to each other. The coils may be wound directly on the legs and are moved toward each other to obtain predetermined characteristics. The coils are enclosed within a pair of core clamps to retain the relative position of the coils. Such adjustment can be employed to obtain different impedance or insulation levels. It is also within the contemplation of this invention to use the core as a common core for a variety of transformer designs.

Abstract: An impedance matching transformer and isolation inductance construction for a vertical-end fed radio antenna which enables simple manufacturing tecniques to obtain uniformity of impedance matching from one antenna to the next and which enables the use of a sintered magnetically permeable core of a length longer than three inches. The impedance matching transformer includes a two turn primary and insulating means accurately spacing these two turns. The core is made up of a plurality of relatively cylindrical formed short core elements from sintered magnetically permeable material in end to end relationship. Very thin plastic spacers are interposed between the adjacent ends of the core elements and between the sides of the elements and the housing to prevent chipping.

Abstract: Electrical inductive apparatus having improved support structure for a magnetic core and winding assembly. The support structure includes end plate assemblies, each having a substantially tubular cross-sectional configuration, which are disposed in abutting relation with the outermost turns of the winding assembly and joined to top and bottom end frames disposed adjacent to the top and bottom yokes of the magnetic core. In another embodiment, upper core braces are situated above the winding and are adjustably disposed between the outermost legs of the magnetic core and the end plate assemblies. Lower core braces are disposed below the winding and include members which are disposed in abutting relation with the core legs and joined to bottom end frame.

Abstract: A device for the attachment of insulating collars in the yoke insulation build-up of insulating spacers in transformers with the yoke insulation arranged between the core yoke and the winding ends wherein the respective surfaces of the spacers facing each other are provided with recesses and elevations respectively for fixedly holding the portion of the insulating collars located between two spacers in the yoke insulation.

Abstract: An arc welder has a transformer comprising a pair of flat aligned primary coils of aluminum strip wound on opposite parallel legs of a rectangular open frame core and a pair of aligned secondary coils of the same strip material wound on the same opposite parallel core legs in lateral spaced relationship with the primary coils, a flexible strip encircles each pair of aligned coils tightly banding them against lateral distortion, a flux shunting core encapsulated in molded plastic material is slidably movable through the core between the pairs of aligned coils, and mechanism for slidably moving and locking the shunting core in adjusted positions is operated by a single handle. One secondary coil of the pair comprises two windings, one wound over the other to provide two output ranges. In a modification, the addition of an outboard choke coil of round wire provides a third output range.

Abstract: A connector assembly for joining gas-cooled conductors of a dynamoelectric machine. Conductor compression in two mutually perpendicular directions is provided by a pair of plate members which are slideably engaged with a pair of wedge members. A compressive force applied to the plate members is transmitted directly to overlapping conductor end portions in a first direction, and a component of the compressive force is also transmitted to the conductors in a direction normal to the first direction by means of an inclined surface engaging arrangement between the wedge and plate member. The positive, controllable biaxial compression feature provides high mechanical strength and good electrical conductivity. Bolts for securing the plate and wedge members together are inserted from only one side of the connector, thereby providing easy assembly and clearance for induction soldering and ultrasonic inspection.

Abstract: A reactor winding in the form of a high current, multi-turn, multi-layer insulated coil stack embracing an inner member of a magnetizable core assembly of a reactor is resiliently supported by the outer member of the core assembly by inserting a plurality of ripple spring sheets of non-magnetic material between the outer member and selected adjacent surfaces of the outer periphery of the windings. The inner core member is resiliently supported within the coil stack by an additional plurality of ripple spring sheets disposed between adjacent surfaces of the coil stack and inner core member. Ripple spring sheets are also positioned between adjacent surfaces of the inner and outer core members. The ripple spring sheets are preferably disposed between flat side sheets to provide uniform distribution of the spring forces.

Abstract: An improved clamping device for maintaining clamping pressure in a winding of a power transformer during its useful life. A remotely actuated hydraulic jack, or similar device, is used to initially apply a clamping force to the transformer winding. A spring-loaded mechanical follow-up device maintains the coil clamping force at a relatively fixed value when the remotely activated clamping force is relieved.

Abstract: A plurality of conductors are surrounded by a continuous, flexible belt which is doubled over to provide loops at each end thereof. Non-metallic rods are disposed through the loops for providing surfaces to which a non-metallic buckle or strap is connected for securing the belt. The belt consists of a plurality of glass fiber cords which are surrounded by a cured elastomeric material. The cords are formed from glass fiber strands which are twisted sufficiently to provide the desired amount of belt strength and flexibility.

Abstract: A holding arrangement is disclosed which can be employed to hold a winding enclosure which contains a low-temperature-cooled electric winding on which alternating external forces act, and which is fastened within a vacuum tank by means of tie rods. In particular, the arrangement includes pre-tensioned tie rods which are arranged to unilaterally pull, via pressure posts, with force-transmitting contact the winding enclosure against the inside walls of the vacuum tank. More specifically, the tensioning force at room temperature is selected such that at low termperature a residual tension force remains which is always at least as large as the component of the external force opposing it. With such a design for the holding arrangement no readjustment devices are necessary and the heat conduction effected thereby is relatively minor.

Abstract: An induction heating coil assembly including a flat induction coil wound from a glass-braid-encased multi-wire conductor retained on a rigid asbestos-cement support plate by a number of radially-extending metal retainer clips snapped into openings in the support plate. A shorted turn of heavy copper wire encircles the heating coil to confine its magnetic field and act as a coil-proximity spacer in cooperation with the underside of the horizontal glass panel member that forms the pan-support surface of a smooth-top range. Brackets of electrical insulating material provide support for the coil support plate.