Abstract: A combined trip actuator and accessory module for molded case circuit breakers is accessible in the field for user selected accessory options. The trip actuator includes a U-shaped stator with a permanent magnet at the end of one leg. A spring-loaded armature member extends across both legs to form a closed-loop magnetic circuit. The over-current trip coil and shunt trip coil are arranged on one leg with the undervoltage coil arranged on the other leg. The accessory module is accessible from the top surface of the breaker cover for field installation of the undervoltage and shunt trip coils to provide the corresponding undervoltage and shunt trip functions.

Abstract: A fused disconnect switch is contained within a molded plastic cover pivotally attached to a molded plastic case. The switch contact blade is directly attached to the cover whereby movement of the cover in one direction slidingly connects the switch contact blade between the line and load stabs mounted within the case. Movement of the cover in an opposite direction slidingly disconnects the switch contact blade from the line and load stabs. Elongated slots integrally formed within the cover and the case cooperate to prevent access to the switch components when the switch blade is in its "ON" position. The configuration of the slots allow for locking the switch in either the "ON" or "OFF" position.

Abstract: An improved vehicle headlamp for developing forward illumination and having reduced dimensions relative to prior art headlamps is disclosed. The lamp comprises an enclosed concave parabolic reflector of a rectangular cross section type and having a single tungsten-halogen light source coaxially located within the enclosed reflector. The headlamp has a glare shield arranged around the light source when the headlamp is utilized for low beam application and a heat shield located about the light source for both low and high beam applications. The light source is of a tubular shape and has a bulbous portion preferably of an ellipsoidal shape. The efficacy of the light source is improved by means of an infrared reflective coating placed on its outer surface.

Abstract: An integrated protection unit is a circuit breaker which includes basic overcurrent protection facility along with selective electrical accessories. A molded plastic accessory access cover secured to the integrated protection unit cover protects the accessory components from the environment. The accessory cover includes means for cooperating with a load center or panelboard circuit breaker enclosure to prevent access to the accessory components within the load center or panelboard interior.

Abstract: A series ballast circuit for operating a gas discharge tube from a constant current alternating voltage source having a fundamental frequency is disclosed. The primary feature of the ballast circuit comprises a ballast transformer having a magnetic core and at least a primary coil and at least a secondary coil. The ballast transformer has parameters that are selected in accordance with the operational conditions, that is, the extinguished and non-extinguished states of the gas discharge lamp. The primary coil and the area of the core have parameters selected in accordance with the extinguished state of the gas discharge tube. The primary and secondary coils have a selected turn ratio so as to produce a current level sufficient to maintain the ionization condition of the gas discharge tube in its non-extinguished state.

Abstract: An adapter module allows circuit breakers and disconnect switches of varying ratings to be installed within a common power panel enclosure. The adapter consists of a plastic base member through which multiple contact jaws extend for plugging onto the individual phase buses of a multi-phase power system. The opposite ends of the jaws include means for connecting with the line terminal of both the electric circuit breakers as well as the electric disconnect switches.

Abstract: A first pattern of circular indicia of the same diameter and of equal spacing is superimposed with an overlapping second pattern of circular indicia of the same diameter as the first pattern indicia. The indicia of the second pattern are in progressively larger spacings in mirror image relation to a central reference indicia. Measurement indicia are adjacent to each indicia of the second pattern. Observation of the most closely aligned indicia of the first and second patterns and the measurement indicia corresponding to that most closely aligned indicia gives a quick visual measurement of the magnitude of the misalignment.

Abstract: A speaker having a slotted flange is attached by a robot to printed circuit board mounting posts. The posts are slotted and dimensioned so the post slots are slid into engagement with the flange slots in interlocking arrangement. The posts and flange are dimensioned so that a robot hand can slide the flange between the posts in interference fit such that the relatively rigid posts are torqued apart flexing the board. When the flange and post slots engage, the board flex forces snap the posts and flange in locked engagement.

Abstract: A power supply for a metal halide discharge lamp includes a circuit for applying a high voltage starting pulse to the arc tube of the lamp to initiate the discharge, a glow transition current to provide power transitioning the arc tube from its glow to its run mode, and a run power supply circuit to provide continuous controlled d-c current to the arc tube.

Abstract: A current limiting circuit breaker having a pair of separable contacts closely spaced for electrodynamic repulsion upon the occurrence of a short circuit overload condition utilizes an arc chute to cool and extinguish the arc that occurs when the contacts become separated. The arc chute contains a plurality of metal arc plates supported by side plates which also assist in cooling and extinguishing the arc. The side plates are formed from a three-layer configuration wherein the two outer layers have excellent arc extinguishing properties while the inner layer has good mechanical support strength.

Abstract: A method and apparatus for precision winding of coils on bobbins. Ideal positions for all portions of wire on the bobbin are predetermined on the basis of a planned winding profile taking into account number of turns, wire size and bobbin dimensions. Then incremental control of traverse, simultaneously with spin of a fly head winder, relative to the bobbin is utilized to put the wire down on the bobbin at the ideal positions independently of the lay of prelaid turns. The control is preferably done through a computer whose memory contains essential data on the winding profile. The computer is programmed to read feedback signals on instantaneous traverse and spin and provide control signals to cause the winder to duplicate the coil winding profile.

Abstract: A random access communication system forms messages to be transmitted into subpackets of fixed duration. A message packet includes two or more subpackets. Each subpacket includes information relating to the source transmitter-receiver and the number of subpackets in the message. The subpackets of the message packet are transmitted contiguously over the transmission path in a contention mode. Some subpackets are successfully received and some are lost due to collisions. After a period of asynchronous contention operation, a predetermined number of subpackets are successfully received, and the system switches to a short-term synchronous, scheduled operating mode. In the scheduled operating mode, those transmitter-receivers which were the sources of message packets including some successful and some unsuccessful subpackets retransmit the data from the unsuccessful subpackets, ordering themselves in accordance with the order of receipt of successful subpackets.

Abstract: A digital television transmitter has a buffer that receives a low resolution low pass filtered signal. A high resolution high pass filtered signal is applied to the buffer only when the buffer can accept it without overflowing. A digital television receiver receives a digital television picture signal and preferably a transmitter buffer occupancy state signal. A low resolution low pass filtered signal is applied to an adder. A high resolution high pass filtered signal is applied to the adder when the buffer state is low and also when it is intermediate and no substantial motion is present. The transmitter and receiver are useful in video teleconferencing.

Abstract: Molded case circuit breakers having rear mounted line connectors are provided with retainer clips and plates to prevent easy removal of the breakers from electric panel box load stab connectors. The breakers can be removed for replacement however, without disassembling the entire electrical panel box.

Abstract: A mounting arrangement for disposing a light source comprising an inner envelope within an outer envelope with both envelopes comprising a general service tungsten-halogen incandescent lamp is disclosed. The mounting arrangement has parameters which are selected in accordance with the ratio between the natural frequency characteristics of the filament of the light source and the mounting arrangement itself. The selected ratios of the natural frequencies of the filament and the mounting arrangement reduce the typically experienced shock vibrations of the general service lamp that are transmitted to the filament and thereby improves the overall life expectancy of the general service incandescent lamp.

Abstract: A molded case circuit breaker includes accessory functions such as an auxiliary switch and a shunt trip device mounted within the circuit breaker cover. A stain relief assembly interfaces the accessory wires with the circuit breaker case and cover. The strain relief fixture prevents inadvertent or intentional displacement of the wires from the accessory devices.

Abstract: A manually operated trip operator is inserted within a recess formed in a molded case circuit breaker cover, and extends down within the breaker case to interact with the circuit breaker trip bar. The trip operator is formed from a unitary thermoplastic configuration which integrally includes means for interacting with the circuit breaker trip bar and for biasing the trip operator back to its initial position. The unitary manual trip operator is down-loaded into the circuit breaker cover in an automated circuit breaker assembly process.

Abstract: The root mean square value of sensed current within a protected circuit is calculated. A frequency multiplying circuit produces a pulse stream having a frequency proportional to the square of the amplitude of an analog signal representation of the circuit current. A root mean square value over a prescribed interval is developed from the squared current value.

Abstract: A method is disclosed for making a termination between (a) a fiber optic cable having a centrally positioned optical fiber, a plurality of reinforcement strands positioned about the optical fiber, and a jacket positioned about the reinforcement strands; with (b) an electro-optic component housing having a tubular extension. In accordance with the method of this invention, in the initial step a predetermined length of the outer jacket is removed from the fiber optic cable to expose a length of optical fiber and reinforcement strands. The optical fiber is then inserted into and through a passage in the tubular extension to a point within the component housing and preferably fixed in place. The reinforcement strands are then positioned about the outer diameter surface of the tubular extension so that portions of the outer diameter of the tubular extension are covered with the reinforcement strands and other areas are left exposed.