Abstract: A fluorescent lamp ballast is provided which is uniquely suited to automated manufacture and assembly. The versatile ballast construction includes primary and lag coil bobbins each having substantially planar flanges at their respective ends, with a magnetic core having portions disposed inside and on opposite sides of the bobbins. A primary coil is wound on the primary coil bobbin, and a lag coil is wound on the lag coil bobbin, the coils having starts, taps and finishes. Each bobbin flange has a plurality of holes extending inwardly from an outer flange edge, with conductive pins partially inserted into a number of the flange end holes, each of the pins being electrically coupled to one of the coil starts, taps and finishes. A planar elongated printed circuit board whose length and width dimensions are approximately the same as that of the bobbins positioned end-to-end, is part of the ballast assembly.

Abstract: A leadless chip inductor having metallic terminal plates and a coil element fixed to the metallic terminal plates, the metallic terminal plates being partially enclosed, together with the coil element, by a resin molded cover, the portions of the metallic terminal plates exposed to the outside of the molded outer cover being bent along the edge of the molded cover so as to form terminals for connection to an external circuit. The mechanical and electrical connection between the metallic terminal plates and the lead lines led from the coil is achieved by brazing or welding the lead lines to the undersides of a narrow strip-shaped tabs which is projected from each metallic terminal plate. With this arrangement, the coil lead lines are securely connected to the metallic terminal plates.

Abstract: A holding device for wound toroidal cores is formed of a carrier plate and a centering arbor extending from the carrier plate into the inside of the wound core. The wound core is fixed in place on the arbor by a casting compound.

Abstract: A toroidal coil is wound around a donut-shaped ferrite core through which passes one or more conductors for detecting a high current pulse within the conductors. An interface block includes a generally circular recessed upper portion for receiving the toroidal coil/ferrite core combination and further includes a pair of aligned, spaced slots extending between the upper and lower surfaces and within the recessed upper portion of the block. Each of the conductors is in the form of a strip-like metal conductor and is disposed within and along the length of a respective slot in the interface block. The upper end of each strip-like conductor is adapted for mounting to an upper portion of the interface block and coupling to a respective first lead by means of a first mounting screw. Similarly, the lower end of each strip-like conductor is adapted for mounting to a lower portion of the interface block and coupling to a respective second lead by means of a second mounting screw.

Abstract: A cutlery detector device is provided for detecting metal objects discarded as trash along with non-metallic trash material. The detector device includes a metal detecting ring or the like mounted at the top of a trash receptacle, in combination with circuitry adapted to trigger an alarm upon passage of a metal object such as a cutlery item into the trash receptacle. A counter may also be provided to count the number of metal objects placed into the trash receptacle.

Abstract: An ignition coil (1) for internal combustion engines comprises a magnetic core (4) of the core- of sleeve type, around the main core of which the primary and secondary winding being insulatingly enveloped with a cast material is arranged, the end regions of the main core being connected with each other via a magnetic path located outside the two windings, and having mounting members attached to the magnetic core (4) for mounting the ignition coil (1) to an automobile body. In order to bring the heating of the windings to an equal level and to reduce the heating of the windings, the mounting members are formed of a mounting plate (8) with mounting surface (9) and of at least one frame member (10, 11) integrally formed with the mounting plate (8) which envelopes the magnetic core (4) in a form-locking manner. The frame members (10, 11) can be expediently placed for mounting angularly on the ignition coil (1) and are pivotable in abutment with the surface of the magnetic core (4).

Abstract: A local coil assembly for use in NMR imaging includes a base which supports a pair of spaced local coil modules. The size and separation of the local coil modules can be changed without affecting the resonant frequency of the assembly. Each local coil module includes a pair of loop-gap resonators, and the base provides the electrical interconnection of the loop-gap resonators in each module.

Abstract: An inductive current measuring sensor is provided comprising several coils connected electrically in series and disposed in a polygonal contour, so as to surround the conductor on which it is desired to measure the current. Each coil comprises windings disposed on an insulating bobbin and connection elements. The bobbins are disposed on the face of a printed circuit having a central recess through which the conductor may pass. The printed circuit carries conducting tracks interconnecting the fixing points of the connection elements together and to external connection members.

Abstract: A current transformer comprises coil forms mounted on two opposite legs of a rectangular iron core, and insulating parts for insulating the iron core from a current bar which can be brought through the interior of the current transformer. The coil forms are connected together at both ends by an insulating part which surrounds at least partially the exposed legs of the iron core in U-fashion. For manufacturing a current transformer, the coil forms are first connected by assembling the insulating parts to the coil forms to form a frame into which L-shaped laminations are inserted to form the iron core. These laminations are connected at the abutting gaps by a welded seam. The current transformer is suitable particularly for use in low-voltage circuit breakers.

Abstract: A transformer having a bobbin adapted for mounting a secondary printed circuit board on a primary printed circuit board is disclosed. Means are provided to electrically connect the primary and secondary printed circuit boards to each other and to the transformer.

Abstract: An inductor housing having a platform for supporting an inductor and a standoff unit for supporting the platform away from a conductor board such that various electrical components can be installed on the conductor board between the inductor platform and the conductor board surface. The inductor housing also has a hole disposed therethrough such that the inductor housing may serve as an insulating standoff support member for connecting a conductor board to a chassis.

Abstract: Miniaturized current sensing transformers are electrically and mechanically attached to the printed wiring board carrying the electronic trip unit circuit within molded case circuit breakers. Electrical contacts extending from the current sensing transformers project through openings in the wiring board to springingly engage metal posts extending from the printed wiring board surface. Notched posts mounted on the current sensing transformers, co-extensive with the contacts, snappingly engage the sides of the printed wiring board for good mechanical support and to maintain alignment between the current transformers on the printed wiring board.

Abstract: An induction cooking apparatus or a ceramics hob which heats conductive food and/or a conductive pan through hysteresis loss and/or eddy current loss by exciting a coil with high frequency power, comprises a casing, a coil mounted on a coil support, and an insulation cover plate between the coil and food to be cooked. The coil support is made of ferro-magnetic material of mixture of insulation resin and ferrite powder which occupies 75-85 weight %, instead of a prior mere insulation resin so that no flux leaks below the coil support. Preferably, the coil support has a plurality of longitudinal ferrite ribs extending radially under the coil support, and still preferably, the coil support has a plurality of holes at the central portion of the same so that permeability at the central portion is essentially smaller than that at the outer portion to provide uniform flux.

Abstract: A polarized electromagnetic relay apparatus for assembling a coil spool with a terminal carrying base plate is disclosed. The coil spool assembly has a front collar with a projecting piece. The projecting piece is adapted to engage with a latch hole in the terminal carrying base plate. The terminal carrying base plate has jaw-like, offset portions which engage with supporting offset portions formed in the rear collar of the coil spool assembly. The flexible projecting pieces may be of deformable material in order to easily engage with the latch hole of the base plate. The flexible projecting pieces can be tapered, also to facilitate engagement with the base plate latch hole. A terminal holder is formed on the rear collar of the coil spool assembly and is adapted to receive terminals from the coil. The terminal holder comprises the supporting offset portions which engage with the jaw-like offset portions of the base plate. The terminal holder is of a greater thickness than the base plate.

Abstract: A sensing current transformer having a single turn primary winding for ground fault circuit interrupters and breakers utilizes a conductive post extending through the transformer metallic enclosure in combination with the conductive path across the metallic closure as the current sensing path. A four turn primary winding is provided by four metallic staples, each having one leg extending through the transformer aperture, for establishing four independent current sensing paths.

Abstract: A transformer includes a preformed winding with each turn having a channel cross section. The individual units are joined to form the desired multiturn winding. Another winding is inserted within the channel cross section of the multiturn winding. In one embodiment, the channels of the two turns are joined to form a closed passageway. In another embodiment, they are nested one within each other to form a concurrent passageway.

Abstract: A clamp-down bracket secures a C-shaped housing of a transformer to a concrete foundation. The bracket includes a C-shaped first portion for engaging the side of an opening in the foundation and a second portion coupled to the first portion for engaging the C-shaped housing. The bracket may further include a bolt that is inserted into a threaded hole in the C-shaped portion of the bracket for forcing the second portion of the bracket to engage the C-shaped housing. One or more brackets can be used to secure the C-shaped housing to the foundation.

Abstract: The improved structure of an inductor with an amorphous sheet core and a winding has been found. A core assembly has a pair of housing halves made of non-magnetic material with U-shaped track, in which a laminated amorphous sheet is mounted. The ends of the halves are inserted in a winding so that the ends of the cores abut with each other directly or through a gap spacer. The core halves are pressed by spring action to assemble the inductor. The core halves are produced by the steps of winding an amorphous sheet to a coil, inserting the coil in the track of the housing, and impregnating the coil with plastics.

Abstract: A case for holding a wire-wound magnetic core or other electrical component so that the leads can be automatically inserted on a circuit board which employs a base portion that is shaped and dimensioned for compatibility with conventional automatic insertion equipment. The base includes both plastically-deformable cantilever lead traps for mechanically gripping the leads to secure the component on the base as well as circular notches in the slots that define predetermined positions on the base at which to grip the leads to enable use of the case for automatic insertion.

Abstract: A mounting for an especially current-compensated ferrite ring core choke, includes an insulating material plate, and a potential-isolating device, the potential-isolating device including straps fastened upright on the insulating material plate, and a resilient ring interconnecting the straps, the straps having inner edges facing each other and outer edges, the ferrite ring core choke being slipped on the potential-isolating device with the outer edges of the straps resting resiliently against the ferrite ring core and windings on different sections of the ring core physically separated from each other.

Abstract: This invention relates to a mobile substation wherein constituent equipment of a substation are made movable by carrying them on a chassis of said mobile substation, and in a predetermined site, the substation is connected from a first terminal to a receiving line and from a second terminal to a feeder line wherein a pair of supporting devices is provided each of which has its one end turnably coupled with the chassis, and which can support the receiving line and the feeder line with their other ends corresponding to the respective terminals, when they are fixed to the chassis at predetermined positions.

Abstract: An adjusting and holding assembly for magnet coils in a nuclear spin tomography system includes mechanical adjusting devices connected to a frame structure for the mutual alignment of the connected to a frame structure for the mutual alignment of the base field magnet coils. In order to enable a relatively simple adjustment of the individual magnet coils to produce a highly homogeneous base field, at least one of the magnet coils is rigidly connected to the frame structure, while each adjustable or positionable magnet coil is held at three points via at least one support device and three adjusting devices within the frame structure. Each support device comprises a support element in the form of a spherical sector rotatably mounted to a respective coil and slidably resting on a horizontal support surface of the frame structure.

Abstract: An inductance element of the type that includes a coil bobbin having flanges at the ends thereof, a pair of pot cores engaging the bobbin, and a fastening member for fastening together the pot cores and bobbin. At least one of the bobbin flanges includes a joining part that extends outwardly from the bobbin flange and engages both the adjacent one of the pot cores and the fastening member to prevent relative rotation of the bobbin and adjacent pot core and fastening member. One of the bobbin flanges may include a stepped part having pins extending therefrom for making electrical connection to the inductance element. The stepped part is spaced from the bobbin flange, and connection wires may extend within the space.

Abstract: A plurality of insulated carrier plates are selectively coated with an electrical conductor. Each plate has a pair of flat mounting faces and a plurality of edge faces between the mounting faces. The edge faces include a plurality of spaced-apart, flat, coplanar protrusions projecting from the remainder of the edge faces. One of the mounting faces of each plate is coated with a plurality of mutually isolated first conductive layers, which extend to the respective protrusions. The other mounting face of each plate is coated with a plurality of mutually isolated second conductive layers, which extend to the respective protrusions. The plates are stacked face-to-face so the respective protrusions of adjacent plates adjoin. A conductive layer is then applied to the adjoining protrusions of the stacked plates to the exclusion of the remainder of the edge faces so as to interconnect electrically the respective first and second conductive layers.

Abstract: A magnetic detector instrument includes an elongate circuit board and a magnetic sensor assembly which slides into a slot in one end of the board with edge portions of the board defining the slot being received in opposed elongate grooves formed in the sensor assembly. Also, a fitting for retaining the board while it is rotated in order to set the alignment of the sensor core includes elongate brackets with opposed grooves into which the circuit board slides.

Abstract: The present invention relates to a plug-in arrangement for circuit boards and a process for tin plating contact pins of the arrangement. The present invention improves the tinning of winding end portions of a winding about nonmetallic contact pins on coil forms. The contact pins are adapted for connection with printed circuits. The present invention discloses contact pins in one piece, or with multiple parts, which pins are given a profiled configuration on an outer surface. The contact pins may have different profiled shapes or configurations including grooves. In the case of multiple part contact pins, gaps are provided between the parts. The grooves or gaps permit the escape of gas generated upon the burning of an enamel insulation layer on the winding end portions. Also, the end portions rest above bottoms of the grooves or gaps such that the end portions are surrounded with tin solder.

Abstract: A wire having conductor core, insulating film formed on the conductor core and adhesive film formed on the insulating film is closely and fixedly wound by a predetermined number of turns. Thus, a coil for an electric motor is obtained. A pair of electrodes are formed by stripping portions of the insulating film and portions of the adhesive film formed on the insulating film.

Abstract: A flyback transformer includes a coil unit, a variable resistor unit detachably mounted on the coil unit and a connector for electrically connecting the coil unit and the variable resistor unit. The coil unit has a casing, primary and secondary coils accommodated in the casing, and a terminal which is electrically connected to a center tap of the secondary coil through a lead line extending inside the casing. The variable resistor unit has a circuit board deposited with ohmic resistance stripes and a terminal which is electrically connected to the circuit board. The connector having a U-shape configuration electrically connects the terminal of the coil unit and the terminal of the variable resistor unit.

Abstract: A pushbutton tuner wherein tuning coils are disposed in two decks, upper and lower, and the upper or lower tuning coils are disposed in front of the others. A printed circuit board to be connected to said tuning coils by lead wires is divided in two parts and each part is disposed close to the tuning coils in the associated deck.

Abstract: A small-size inductor for use in a wrist watch or a pocket size calculator includes a base member, a coil and a cap member. The base member is defined by a base plate having first and second opposite faces, a core projection extending from the first face of the base plate, and first and second terminals deposited in a spaced relation with each other on the second face of the base plate. The base plate has at least first and second recesses formed in its peripheral face. The coil is mounted on the core projection. The coil has first and second lead wires, in which the first lead wire extends through the first recess and is connected to the first terminal and the second lead wire extends through the second recess and is connected to the second terminal. The cap member is fittingly mounted on the base member to enclose the coil in a cavity defined by the cap member and the base member.

Abstract: A pickup coil assembly comprises a pancake-shaped coil mounted in a plastic form having a pair of parallel support posts therethrough. The form is positioned in a plastic housing having a central aperture in one wall formed by cut away jaw portions for gripping a conductor inserted therethrough. A back wall of the housing includes a co-axial aperture of larger dimension to permit free passage of the conductor.

Abstract: A plurality of solenoid bobbins or bobbin wound coils are collectively attached to and supported from one surface of a printed circuit board and the coil wires are securely connected to the conductors on the board.

Abstract: An impedance matching network for coupling a microwave transmission line to a field effect transistor (FET). The impedance matching network includes a resistor coupled in shunt with the FET and an inductor connected between the microwave transmission line and the resistor. The inductor is formed by wrapping a conductive wire around a post inserted into a hole formed in a support for the FET.

Abstract: The coil comprises a coil former with a rod-shaped central core portion (1) and two end portions (3,5) wherebetween a winding (13) made of a conductor (15) is provided. No part of the coil projects beyond a first boundary plane which contains an outer surface (25) of the first end portion (3) and preferably also a contact surface (21, 23) and which encloses an angle of between 5.degree. and 85.degree. with respect to the axis (11) of the rod-shaped central portion. The mutual coupling of two or such coils can be very readily varied by mounting the coils in the same position or rotated through 90.degree. or 180.degree. with respect to respect to each other on a substrate (27).

Abstract: An inductive stabilization ballast including a connecting plate (1) which, at the side facing an electric coil (2) of the stabilization ballast is provided with an insulating plastic material layer (5) which, by means of conical feet 5a which cooperate with similar conical holes (8 to 23, inclusive) in the connecting plate (1), is bonded to the connecting plate.

Abstract: The invention relates to a magnetic circuit for inductance devices, to an induction device incorporating such circuit, as well as a process for producing the above-mentioned circuit. The novel magnetic circuit is constituted by a parallelepipedic bar of magnetic material comprising at least two substantially superimposed grooves. This circuit is substantially H-shaped in a plane perpendicular to said grooves. The lower branches of the H, delimiting the lower groove or grooves, are provided with electrical connection means. Consequently, the induction devices thus obtained may be easily and efficiently fixed onto printed circuits, or directly fixed onto hybrid circuit supports. The induction devices thus produced are particularly adapted to be miniaturized.

Abstract: A device for chocking an inverted type current transformer when transported on its side.It comprises at least one jack (12) within the metal enclosure (1) but operable from outside the latter and disposed, during transportation of the transformer on its side, between the transport platform (36) and the magnetic core (8) of the current transformer to eliminate any cantilever loading.

Abstract: A small-size transformer comprises an insulative bobbin having a pair of flanges and a hollow center portion on which an insulated tape wire is wound in layers. The center portion of the bobbin is stepped to accommodate a lead wire so that the tape wire is uniformly wound in parallel layers between innermost and outermost layers thereof. A pair of insulative side members each of U-shaped cross section is fitted to the flanges of the bobbin in positions adjacent the outermost winding layer. A core structure has outer arms received in slots of the side members and an inner or center arm accommodated within the hollow center portion of the bobbin. A base is detachably connected to the bobbin and formed with plural vertical slots to firmly secure tubular lead wires therewithin to serve as terminal pins for connection to an associated circuit.

Abstract: A vibration resistant mounting bracket (10) that secures a power transformer (20,30) within the housing of an aircraft ignition system. The bracket (10) has a single source (11) that extends through the winding (30) and partially around the core (20) of the transformer and is characterized by a pair of downwardly facing surface portions (44, 45) and a pair of upwardly facing surface portions (52,53) which are located in parallel planes with each pair of surfaces being axially offset from each other.

Abstract: A mounting device is disclosed which provides mechanical support and electrical insulation for a current transformer used in monitoring radio frequency signals in the neutral lead of a dynamoelectric machine. By encapsulating the current transformer in a rigid insulative apparatus with a central conductor passing therethrough, the transformer can be placed proximate the neutral bus of the dynamoelectric machine to avoid attenuation of the radio frequency signals.

Abstract: A one-half turn inductor is formed in a mold having a series of spaced ribs forming grooves therebetween, a U-shaped coil has its bight portion positioned in a selected one of the grooves corresponding to the inductance value of the inductor with the legs of the coil projecting beyond the cavity. Plastic is introduced into the cavity to create a coil form with the coil embedded in the plastic. The ribs and grooves form an inspection window consisting of spaced parallel rungs, one of said rungs being an exposed segment of the coil, the remainder being plastic.

Abstract: A coil unit formed of a coil-wound inner core partially circumferentially encased by an outer core. The coil unit is mounted on a plate with the outer core externally exposed and covering the lead-in wires to the coil which are adhered to contacts on the plate.

Abstract: To positively retain a signal transducer coil within an insert ring, axially stacked on a fuel injection nozzle assembly, in which the induction coil provides an output signal upon axial reciprocating movement of the valve needle element of the injection valve, the opening is made large enough to receive a holding sleeve with an inwardly extending flange, the holding sleeve fitting over the induction coil and pressing the coil against the bottom wall of the opening. The holding sleeve, itself, preferably made of magnetic metal, is adhesively secured in the opening which, preferably, has a non-cylindrical shape, either extending conically or formed with a ring groove of, preferably, sawtooth cross section.

Abstract: A coil element formed from a drum-shaped ferrite core on which a coil is wound, magnetic members each made of a magnetic and electrically conductive metal and formed so as to fit to the outer surface of the drum-shaped ferrite core and spaced from each other so as to be electrically insulated from each other, and connection terminals forming a part of the magnetic members connected to the ends of the coil.

Abstract: A high voltage transformer is formed by a unitary core mounting a primary winding being inserted in a cavity of a bobbin that mounts the secondary winding. The secondary winding is placed in alternate bays of a multibay structure to isolate the windings from one another to avoid high potential breakdown. The assembly is complete by the mounting of the core within the cavity of the bobbin, but can be supplemented by covering the entire unit with a protective housing that further aids in mounting the transformer to an insulating surface, such as a printed wiring board.

Abstract: A low profile transformer includes an E - I core having two outer legs and center leg. A pair of connecting pin headers have recesses in friction-fit contact with the inner portions of the outer legs; each header is also recessed, at each end, and is in friction-fit contact with the inner portion of the E-core which joins the legs and the I-bar. A coil wound bobbin on the center core leg has flanges which abut and brace against the pin headers to secure said headers in position. Pins on the headers enable mounting on a printed circuit board.

Abstract: This invention relates to a current transformer support assembly for use in an electromotive machine that includes an armature slideably secured to the electromotive machine housing. The armature end windings have radially disposed neutral armature conductors. The support assembly includes an arcuate shaped support member secured internally of the housing within a recessed region of the housing. The arcuate shaped support member is provided with at least one well shaped opening in which a secondary current transformer winding is positioned. A neutral armature assembly is provided that includes an arcuate strap secured in a mating manner to the support member. The neutral armature assembly has a neutral lead which acts as a primary for the current transformer. The neutral lead is secured to the strap and passes through a central opening in the current transformer winding for electrical connection to a neutral armature winding. The current transformers so mounted are completely supported by the housing.

Abstract: A fixing structure is disclosed for fixing an intermediate frequency transformer or other electronic component to a flexible and deformable base plate. The component comprises a base portion for fixing it to the base plate and the base plate is formed with an aperture for receiving the base portion. The base plate includes a strip portion extending along a portion of the periphery of the aperture. The component is provided with a protrusion which extends laterally from the base portion thereof. The protrusion is so formed and so located on the base portion of the component that when the base portion is inserted into the aperture, the protrusion engages the strip portion and deforms it in a direction perpendicular to the surface of the base plate, so that the diameter of the aperture shrinks, whereby the base portion is strongly gripped by at least a portion of the periphery of the aperture.

Abstract: A transformer unit comprising a transformer, a ground level base pad having a vertical cable opening therethrough, and an open top, open bottom vertical cable vault situated in the earth, the upper end thereof being received in the pad opening to provide easy access to and training room for underground electrical cables connected to the transformer.

Abstract: Electrical apparatus includes electrical coil means formed of multiple turns of enamel-covered electrical wire axially mounted on a core of magnetic material in electromagnetic energy coupling relationship therewith, and a relatively flat flexible electrical cable containing a plurality of spaced parallel conductors extending between the cable ends contains a loop shaped portion extending about an axis of said core over an arcuate distance greater than 180 degrees.