Abstract: A key case is provided which contains an upper end portion with an opening, a lower end portion with an opening, and a sidewall extending between the upper and lower end portions and defining a cavity that is accessible through the opening of the upper end portion and through the opening of the lower end portion. The key case includes a key ring and apparatus, connected to the key ring, for raising the key ring into the cavity adjacent the upper end portion and lowering the key ring from the cavity through the opening of the lower end portion. The key case holds a plurality of keys in a neat, compact package that shields the keys from contact with a pocket or purse and minimizes jingling. Keys are easily added or removed from the key case and the key case is simple to operate.

Abstract: An apparatus and method for a game of skill has a bottom member with a plurality of pockets and a top member. The top member has a base with a plurality of openings therein, a sidewall attached to the base and a cover having a central opening attached to the sidewall. A spindle connects the top and bottom members, and the top member is rotatable about the spindle whereby each of the openings is vertically aligned with each of the pockets during each revolution of the top member. A flipper is attached to the base for hurling a projectile into a cup on the top member. Projectiles missing the cup pass through the openings into the plurality of pockets as the top member rotates.

Abstract: A bus bar stab insulator shroud cooperates with a bus bar stab housing to insulate and protect the stab fingers. The shroud includes an insulative member which has first and second side members connected by a central member which has first and second openings of a size sufficient for receiving stabs of a bus bar stab.

Abstract: A contact arrangement for switchgear with multiple disconnects by contact points connected in parallel of two contact bridges aligned in a contact actuation link uses a spring collar for a contact pressure spring. The spring collar has cutouts transverse to the spring-action direction into which the contact bridges with the spring collars can be inserted and locked in place transverse to their longitudinal direction. The spring collar is rounded at two facing sliding surfaces in the contact actuation link aligned transverse to the longitudinal direction of the contact bridges. This assures optimal fitting of the contact bridges to the fixed contact components without jamming the spring collar in the alignment.

Abstract: A three-phase load center which has a base pan including a first and a second bus bar for a first and a second phase. The bus bars are positioned on the top surface of the base pan. A third bar for a third phase is positioned beneath the base pan such that the bus bar is in contact with the bottom surface of the base pan. An insulator is connected to the base pan such that the third bus bar lies between the base pan and the insulator. The base pan and the third bus bar are each provided with ribs and grooves. These ribs and grooves cooperate to form ventilation passageways.

Abstract: In order for a coil winding head, preferably to be reinforced by the baked-lacquer process, to be compression-molded with no need for preliminary pre-positioning by tape-wrapping and with no damage to the winding wires, a form shell apparatus is provided with a form core, which radially confines the coil end forms shape on the inside, with a radially advanced confining form shell divided into at least two parts in the circumferential direction. This multi-part shell radially confines the coil end turns on the outside. A compression form shell axially advanceable against the coil end turns confines the coil end turns in an axial direction. It has, on its inner and outer circumferential surfaces, integrally molded guide fingers, which extend axially in the direction of the coil end turns to be shaped. Corresponding guide grooves are molded into the form core and the confining form shell, into which guide grooves the guide fingers extend.

Abstract: To supply various loads connected to a uninterruptible bus, a power supply system N is connected (when functioning normally) by means of a mechanical switch, keeping an energy storage unit charged by means of a static converter which also functions preferrably as a phase shifter to stabilize the supply voltage. In the event of a power system malfunction, the storage unit is discharged by means of the static converter arrangement, and the mechanical switch is opened. The opening of this switch is not critical since between the switch and uninterruptible bus there is an inductance arrangement and an auxiliary switch. In case of a power system malfunction (auxiliary switch open), a large inductance and its large corresponding impedance of the inductive impedance arrangement becomes effective which during proper operation of the power system is shunted.

Abstract: A shutter mechanism is provided for a motor control center of the type having a backwall with a stab opening for receiving a stab connector for making electrical contact with bus bars which are behind the panel. The shutter consists of two pieces, a stationary member which has a central opening and a vertical slit opening into the central opening and a movable member which has a guide thereon and is positioned between the motor control center and the stationary member with the guide extending through the slit and vertically movable therein. The stationary member is fastened to the motor control center with the central opening overlaying the stab opening. The movable member moves from a closed position to an open position and then from the open position to the closed position under the force of gravity alone without the use of springs.

Abstract: An improved switch head for engaging and making electrical contact between first and second stationary electrical conductors. The switch head comprises lower and upper insulating head sections, biasing means and a contact slug contained within the lower insulating head section for contacting and making electrical connection with the first and second stationary conductors, and clamping means for holding the lower and upper insulating head sections together. The clamping means places the lower and upper insulating head sections in compression when the switch head engages the first and second stationary conductors. The clamping means also applies a force to the lower head section to disengage the switch head from the first and second stationary conductors.

Abstract: A circuit breaker having an automatically adjusting magnetic armature is provided. The magnetic armature includes a spring-biasing means to automatically maintain one end of the armature in the contact with the electromagnet and the other end away from an adjacent electromagnet. The magnetic armature includes a pair of slightly curved arms which are disposed about a pivot guide post. When current through the circuit breaker exceeds a predetermined amount, the end of the armature normally biased away from the adjacent electromagnet is suddenly attracted to the electromagnet. The force from the spring-biasing means is overcome, and the slightly curved arms of the armature pivot about the pivot guide post so that the armature contacts the adjacent electromagnet. A latch holder at the end of the armature becomes disengaged from a latch means to cause the circuit breaker to open.

Abstract: A motor control center of the high voltage type which includes a set of three vertically-disposed cubicles. The two lower cubicles house a pair of contactor assemblies, the lowermost contactor assembly being longer than the upper one. The cubicle enclosing the upper contactor is provided with a partition behind which is a compartment containing vertical bus bars. The lowermost cubicle extends beneath this compartment so that the bus bars drop directly down to engage a set of connectors which are also engaged by the lowermost contactor assembly.

Abstract: A contactor of the high-voltage type utilizing an arc chute and aligned magnetic pole pieces for urging an arc into the chute for quenching. A pair of rigid bus bars extend upon either side of the arc chute assembly, and are projected along the edges of the pole piece to supplement the arc displacement capability of the pole pieces, particularly at higher current values.

Abstract: A current-limiting electrical apparatus is provided including a housing with first and second electrical terminals contained therein. A pair of electrical contacts is disposed within the housing and electrically connected in series with the first and second terminals. A biasing means applies a biasing force to the pair of electrical contacts to bias them to a closed position. The pair of electrical contacts is configured to cause the contacts to electromagnetically repel each other and to overcome the biasing force and open when the current flowing through the contacts exceeds a predetermined value. A mechanism is provided responsive to the current flowing through the pair of electrical contacts for decreasing the biasing force as the current flowing in the electrical contacts approaches the predetermined value, to thereby decrease the predetermined value causing the electrical contacts to immediately open.

Abstract: An inexpensive power supply for an electconic control system or the like which is capable of converting a wide range of applied AC voltages into a regulated output voltage. A thyristor is coupled in series with an input terminal and a threshold device, such as a Zener diode, placed across the input terminals and paralleled by an RC circuit coupled to the thyrisor gate. Another capacitor is coupled to the thyristor cathode. A ramp-like voltage impressed on the thyristor gate effects triggering at a phase angle which varies in accordance with output voltage. The electronic control system outputs a uniform train of pulses which serve to disable a circuit interrupter. Termination or disruption of the pulse train causes the interrupter to open the protected circuit.

Abstract: An improved drawout carriage assembly for the contactor of a high voltage controller. The controller carriage is fabricated from a pair of sheet metal sides, interconnected at their lower edge by formed sheet metal cross members. The upper portions of the sides are comprised of planar sheets of insulating material. A series of insulative cross members are bolted between the opposed faces of the carriage side pieces and locate elements of the contactor mechanism.

Abstract: An improved method of joining insulated conductors and providing a water-tight seal. The area about the joined conductors is filled with a putty-like insulation filler material and an O-ring placed on the conductor insulation, some distance from the joint. The joint, including the O-ring, is overtaped with resin-rich insulation tape and the tape is surrounded by a shrinkable polyester film. Heat is applied to partially cure the insulation tape, and to cause the polyester film to contract tightly about the joint.

Abstract: A lever-type handle for operating a racking mechanism and providing an interlock for a cabinet enclosing electrical equipment. The handle is comprised of two sections which are linked together by a throughbolt. A cover assembly retaining and enclosing a portion of the handle is provided with an opening oriented so that the bolt is only accessible when the handle is in an "on," or energized, position. By removing the through bolt the handle sections are disengaged so that one portion can be moved to a non-locking position and access gained to the cabinet interior.

Abstract: Aromatic aminosulphonic acids which have a reduced content of discoloring by-products are obtained when aromatic amines are reacted with a sulphonating agent in a reaction medium at least some of which consists of tetramethylene sulphone.

Abstract: A cabinet enclosing high voltage electrical apparatus is formed of a deformable, alignable framework made of structural steel or the like, and comprises at least one compartment for receiving a contactor carriage assembly. A rigid subchassis is separately constructed and mounted within each cubicle. The subchassis forms a high-integrity structure which supports and engages the contactor carriage, and maintains alignment of interengaging parts despite distortions of the cabinet framework.

Abstract: A control is provided for an AC circuit protection system or the like which is capable of monitoring either single phase or polyphase current flow. The composite current is periodically sampled at a frequency f.sub.s which is not a harmonic frequency of circuit current. The current sample values are converted into digital form and processed, then stored in an accumulator stage. When an overcurrent condition occurs the accumulator stage overflows and trips a circuit interrupter.