Abstract: An electromagnetic contactor characterized by a stationary contact structure, a movable contact structure, the movable contact structure comprising a contact arm and a conductor, and a shuntless, pivotal electrical connection between the contact arm and the conductor.

Abstract: A multi-phase electrical power distribution apparatus characterized by a section of bus duct having a plurality of multi-phase bus bars supported therein, a ground bar within the bus duct, an insulated outlet opening in one wall of the bus duct, a plug-in unit detachably mounted on the bus duct and having electrically conductive means extending through the opening and attached to the bus bars, and a ground conductor extending through the opening and being detachably connected to the ground bar.

Abstract: A high voltage motor controller which is capable of accepting a modular plug-in unit comprising a power fuse assembly and isolating switch apparatus of a drawout type, and characterized by a safety shutter mechanism for mechanically driving an isolating shutter between open and closed positions, to prevent accidental access to the energized stationary line stabs.

Abstract: An arc chute for a circuit breaker characterized by a pair of spaced side walls for an interior arc extinguishing chamber, the surfaces of the walls forming the chamber being covered with a coating of an arc resistant ceramic material, such as aluminum oxide, zirconium oxide, chromic oxide, magnesium oxide, and calcium oxide.

Abstract: A shield for avoiding the accumulation of contaminants and dust on stabs of loadcenter bus bars during handling and shipping characterized by a molded sheet-like member having spaced blisters extending from one side of the member, and the blisters being comprised of a semi-rigid material adapted to cover the bus bar and stabs detachably clampingly engaged in place.

Abstract: A circuit interrupter characterized by a manually operated fast acting switch and an overload relay for tripping of switch in response to current overload. The switch comprises means for moving electric contacts between open and closed and tripped positions which means includes a releasable arm which is movable between latched and unlatched positions. The switch also comprises a pair of pushbuttons for manually opening and closing the switch which pushbuttons are effective to move a lever which in turn actuates an overcenter toggle mechanism for opening and closing the switch.

Abstract: A bus duct assembly characterized by a bus duct section having top and bottom walls and opposite side walls forming a housing, a plurality of multi-phase bus bars supported within the housing, a ground bar within the housing and adjacent to one side wall and substantially coextensive with the housing, a retaining bracket mounted on the side wall and overlapping the ground bar, a tap box mounted on one of the side walls which overlaps the other and having a plurality of terminals connected respectively to the several bus bars, and a ground terminal within the tap box and connected to the ground bar.

Abstract: Ground fault circuit breaker structure characterized by an insulating integral housing having a pair of side-by-side compartments that are separated by a partition wall. A circuit breaker is located in one compartment and a ground fault detector is located in the other compartment and isolated from the circuit breaker. The ground fault detector comprises a differential transformer comprising a current monitoring core, a plurality of primary windings on the core, each being one of a line and a neutral conductor of an A.C. electrical distribution system, a secondary winding sensing current unbalance between the primary windings, means responsive to a predetermined sensing signal to open the line conductor; and the line conductor extending between the circuit breaker trip means and through aperture means in the partition wall and through the magnetic core and back through the aperture means to the load terminal.

Abstract: A process for reducing a metal from a metal halide characterized by the steps of feeding into the arc heated stream of an arc heater a quantity of a reactant metal such as an alkali or alkaline-earth metal, feeding into the arc stream a quantity of a metal halide, which metal has a melting point higher than the boiling point of the co-product salt formed by reduction of the metal, the co-products being a liquid elemental metal and a gaseous salt, projecting the co-products into a reaction chamber tangentially to cause the liquid metal to separate centrifugally from the lighter, gaseous salt, and depositing the liquid metal in an associated receptacle.

Abstract: A magnetic contactor characterized by stationary and movable contacts with the stationary contact comprising at least two contact sections including a pivot section for limited movement toward the movable contact. The pivot section is mounted on a pivot edge of a first conductor and is spring biased against the pivot edge and in a position of limited movement. The movable contact is mounted on a support lever which is pivotally mounted to effect limited vertical and horizontal movement of the movable contact with respect to the stationary contact. The electromagnetic means of the contactor comprises an armature for moving the lever, and link means between the lever and the armature and includes a spring biasing structure for effecting over-travel movement of the lever. Finally, a magnetic blowout assembly and an arc chute are provided adjacent to the stationary contact zone for facilitating the interruption of an arc incurred during separation of the contacts.

Abstract: An electromagnetic contactor characterized by stationary and movable contacts operable between open and closed positions by an armature of an electromagnet which is movable between energized and deenergized positions, and latch means for latching the armature in the energized position to hold the contacts in the closed position when the load current through the contact exceeds a predetermined value even though the electromagnet means is deenergized.

Abstract: A circuit breaker responsive to abnormal currents in conductors of an electrical distribution system characterized by separable contacts and trip means therefor, which means comprises a stationary magnetic structure for each conductor including a magnetic coil and core assembly and armature therefor, a lever associated with each stationary magnetic structure removing a trip bar to an unlatched position, the lever comprising the armature and being movable in response to abnormal currents in at least one of the conductors, and tension means for varying tension on the lever and including a manually operable cam, cam follower, and tension spring operatively connected between the cam follower and the lever for adjusting the force required to attract the armature to said assembly.

Abstract: A process for the production of magnetic spheres from grit of magnetite ore by introducing the grit into an arc heated gas jet, thus heating the grit to a temperature of at least 1600.degree. C, and allowing the melted magnetite droplets to spheroidize and cool to a solid state.

Abstract: A circuit breaker structure characterized by a multi-pole circuit breaker which is adapted for quick removal and/or replacement of a circuit breaker having at least two horizontally spaced poles, each pole comprising two vertically spaced incoming and outgoing terminals or disconnecting contact assemblies, each terminal comprising a plurality of horizontally spaced terminal members or fingers which are vertically disposed, the terminals being adapted to connect with a plurality of spaced incoming and outgoing bus conductors comprising upper and lower sets of conductor members or fingers which are interengageable with the terminal fingers of the corresponding terminals, each set of upper and lower incoming and outgoing terminals having aligned apertures, each set of upper and lower incoming and outgoing conductor fingers having aligned slots, a first insulated bolt and nut assembly extending through the aligned apertures of the upper set of terminal fingers and having insulating spacers between horizontally sp

Abstract: A fluidized bed system characterized by a fluidized bed chamber for coating objects dipped therein, the chamber having a bottom surface through which pressurized air is diffused uniformly throughout the cross sectional area of the chamber, and means for controlling the volume of air to effect a smooth suspended powder condition within the chamber during operation.

Abstract: A pushbutton switch structure characterized by a pushbutton switch handle and a plurality of switch blocks mounted in tandem, each switch block having an operating plunger for simultaneous operation by said switch handle carrier means associated with the plunger for carrying movable contacts between open and closed positions of stationary contacts, the plunger and carrier means having spaced complementary surface means engageable during movement of the plunger, whereby actuation of the pushbutton handle effects simultaneous operation of all of the plungers and a delay of movement of movable contacts from the normally closed position.

Abstract: A two-stage process for converting metal-bearing ore to a metal or an alloy characterized by the steps of, first, partially reducing an ore having a relatively higher valence state to an intermediate product of a lower valence and, second, treating the intermediate product in an arc heater having a carbon-bearing reductant atmosphere in an amount in excess of that required to reduce the intermediate product to the metal form, whereby to produce a substantially pure metal or an alloy, such as ferrochromium, and an unused excess reducing gas or derivative thereof which are recirculated to the first step to assist in the partial reduction.

Abstract: A rotary selector switch characterized by a rotatable switch actuating unit and two switch structures, the actuating unit having a shaft with multiple sides on which a cam is detachably mounted for operation in a plurality of modes to operate the switch structures in different combinations of open and closed conditions, whereby a single cam mounted on the shaft in different positions is useful to operate the switch structures in a plurality of switch combinations.

Abstract: A reset assembly for an overload relay adapted to function in conjunction with a contactor for controlling an electric load such as a three-phase motor. The overload reset assembly is characterized by a reset rod and an extension rod detachably mounted on the reset rod which rods comprise detachable interlocking means for assembly and disassembly whereby the extension rod extends from the reset rod to the access door of a metal enclosure containing the overload relay.

Abstract: A method for refining an iron-base metal such as pig iron which contains minor amounts of elements including silicon, manganese, phosphorus, carbon, sulfur, and other incidental impurities, characterized by the steps of containing molten iron-base metal in a metallurgical vessel, heating and oxidizing the molten metal to cause chemical reactions to remove excessive contents of the said elements, adding solid lime and a mixture of fluorspar and slag conditioners of relatively high basicity (lime-to-silica ratios of 2.5 to 4.0) which conditioners consist essentially of oxides of selected metals including iron, manganese, silicon, magnesium, and calcium, and which conditioners have a melting point of from about 2,000 to 2,800 F, and continuing to heat while oxidizing the mixture of the molten metal, slag conditioner, fluorspar and slag-forming materials until said minor amounts of elements are reduced to the desired percentages, and are retained in the slag formed.