Abstract: A protection circuit for a video display apparatus causes shutdown to occur at substantially the same high voltage level for all fault conditions. The video display apparatus incorporates an SCR regulator and a high voltage transformer tuned to the third harmonic. To counter the effect of shutdown to occur at a higher voltage level for a shorted SCR fault than for other faults, the SCR anode control pulse is processed to provide a signal having different voltage levels for normal SCR operation and shorted SCR operation. The voltage level which occurs during a shorted SCR condition is selected to cause shutdown of the video display apparatus at substantially the same high voltage level as that for other fault conditions.

Abstract: An apparatus and method for reducing material accumulation on processing equipment caused by electrostatic charge. By proper selection of materials, the equipment is designed to automatically develop a charge of the same polarity as that on the material being processed and thereby repel the material. The selection can be based on the relationship of the materials in the Triboelectric Series. The processing equipment is also electrically insulated from discharge paths so that the charge developed will not be dissipated or require high current generation to maintain the voltage required to repel the material particles.

Abstract: Portable electrostatic spraying apparatus having a low stored energy wherein the capacitor of the high voltage circuit is formed by the capacitance between a lead connecting the high voltage generator output to the spray nozzle and a lead connected to the other side of the generator output.

Abstract: An internally cooled semiconductor package including a wafer-like semiconductor body with at least two electrical elements, one at a relatively flat surface of the body. A wall of high electrical and heat conductive material abuts the flat surface of the semiconductor body to be in good heat conductive relation therewith and in electrical contact with the same. A fluid flow heat exchanger is on the other side of the wall in heat exchange relation therewith and along with the wall and other components serves to encapsulate the semiconductor.

Abstract: An improved dual aperture dipole electromagnet includes a second-harmonic frequency magnetic guide field winding which surrounds first harmonic frequency magnetic guide field windings associated with each aperture. The second harmonic winding and the first harmonic windings cooperate to produce resultant magnetic waveforms in the apertures which have extended acceleration and shortened reset portions of electromagnet operation.

Abstract: Disclosed is a dual-gap protector wherein both gaps will break down essentially simultaneously when a pulse of either polarity having a sufficient magnitude appears. An annular electrode is provided in the housing so as to form parallel gaps with respective end electrodes. The electrodes include a surface coating of a photoemissive and/or thermionic material so that light emission or heat resulting from the breakdown of one gap will influence the breakdown of the other gap.

Abstract: A short detection circuit and method for operatively controlling current in an electrical load such as an alternator field coil includes a driving device such as a Darlington transistor for driving the electrical load. Detecting means selectively withhold and provide operating current to the driving means when a shorted and not shorted condition of the electrical load is respectively detected at the driven terminal of the driving device.

Abstract: A connector is provided for the suppression of electromagnetic impulses traveling along a radio frequency transmission line. Paired first and second electrical connectors are provided for being operatively interposed along the transmission line. First and second conductors are provided for electrically coupling the primary conductors and secondary conductors of one connector to their counterparts in the other paired connector. A discharge device or tube having a known breakdown voltage and a known capacitance is coupled between the first and second conductors. First and second capacitors are coupled in series respectively with the first and second conductors for blocking the flow of dc energy therethrough.

Abstract: A permanent magnet with a split magnetic flux conductor between the pole shoes serves to attract a magnetizable load to the pole shoes of an electromagnet whose pole shoes constitute extensions of the pole shoes of the permanent magnet and whose split magnetic flux conductor extends between the respective pole shoes in parallel with the other conductor. An armature is movable into the gap between the parts of the magnetic flux conductor of the permanent magnet or between the parts of the magnetic conductor of the electromagnet by a fluid-operated motor or by the application of d-c current of proper polarity to the exciting coils of the electromagnet. The permanent magnet ceases to attract the load to the pole shoes of the electromagnet when the armature is moved into the gap between the portions of the magnetic flux conductor of the electromagnet.

Abstract: A transient voltage protector is provided for telephone lines and the like. An insulating plastic housing is provided with two pairs of terminals having female connections at the lower ends for association with selected terminals of a telephone terminal block. The upper ends of these terminals are of a male type and extend above the top of the housing for receipt of further elements such as bridging clips, plug-on fuse units, or line status indicators. An offset and raised portion of the housing carries a pair of zener diodes having lower wire terminals connected to two of the aforesaid terminals. The upper wire terminals of the zener diodes are connected to a grounding terminal having an upper portion extending above the housing in the form of two spaced tines for receipt of a common ground wire between the tines. The various terminals and the zener diodes and the housing have complementary structure for positioning of the terminals and the diodes within the housing.

Abstract: A plug (10) carries terminals (38) which also act as switch contacts and which insert into a receptacle (12) with essentially zero insertion force. The receptacle also carries terminals (84) which similarily double as switch contacts. After insertion of the plug into the receptacle, the plug terminals and receptacle terminals are electrically bridged by electrical bridges (68) driven forward by actuator means (62, 122) which also doubles as an integral part of an interlock arrangement. A first bayonet type of polarizing means ensures that the plug will only insert into the receptacle in a single orientation, whereas a second polarizing means permits keying a given plug to a given receptacle. The combining of switch and interlock into a minimum of parts provides simplicity and interlock protection as well as creates an exceptionally compact design.

Abstract: A method of isolating a spur line of an electrical power system protected by a multi-shot resetting circuit breaker wherein at least two successive current surges in the spur line which activate the circuit breakers are detected. In response to the detection the spur line is isolated during a subsequent current dead period.A sectionalizer is described for isolating a spur line of an electrical power system protected by a multi-shot resetting circuit breaker. The sectionalizer comprises a metal casing 22 providing a current path across a fuse mounting 10 while the sectionalizer is in a conducting position. An electrical circuit 23 inside the tube detects at least two successive current surges in the casing and during the following dead period actuates a chemical actuator 14 to trip the sectionalizer out of its conducting position.

Abstract: A device for neutralizing static electric charge on a surface comprising a support means, a plurality of resilient, flexible thin fibers having an electrical resistivity of from about 2.times.10.sup.3 ohm-cm to about 1.times.10.sup.6 ohm-cm., the fibers being supported by the support means in such manner that the fibers are oriented and extend in a uniform direction, in a brush like configuration from the support means so that the distal ends of the fibers may extend toward a surface which has a static charge which one wishes to neutralize. Preferably, the resilient fibers have a resistivity of from about 4.times.10.sup.4 ohm-cm. to about 4.times.10.sup.5 ohm-cm., and are arranged in a linear array of spaced discrete bundles of fibers in a conductive potting composition in the support holder. Preferably the fibers are made of a partially carbonized polyacrylonitrile fiber and the device may be used in an electrostatographic reproducing machine having at least one dicorotron charging device.

Abstract: The central locking installation for motor vehicles comprises a plurality of electric bolt drives (1) and a time control system (17, 19) trippable by at least one manually actuatable control switch (21). In a first switch position of the control switch (21) the system switches on the bolt drives (1) for a first pre-determined time period in the locking direction and in a second switch position of the control switch (21) switches them on for a second pre-determined time period in the unlocking direction. For automatic overload prevention a capacitor (27) is provided which is charged through a charging current circuit (29, 31, 33) enabled by the time control system (17, 19) during the pre-determined first and/or second time period. A threshold stage (37, 41, 43, 45) which blocks the time control system (17, 19) on reaching of a pre-determined value of the capacitor voltage for the switching on of the bolt drives (1) in the locking and/or unlocking direction is connected to the capacitor.

Abstract: Grounding apparatus for use in a telephone pedestal and the like and for use in selectively connecting and disconnecting electrically conductive shields of a telephone cable or the like to a ground rod. The grounding apparatus includes a ground block fixed to the front surface of a divider plate of the pedestal. The ground block also supports a cable ground bracket and connects the ground bracket to a ground rod. The ground bracket is adapted to facilitate grounding of the shields of service wires and the like.

Abstract: A container (10) for longitudinally receiving a plurality of electrostatic sensitive electronic components (12) having a rigid, transparent, elongated channel (14) being open on at least one end. The channel (14) has a transparent, insulative layer (22) and a transparent conductive layer (24) at least partially transversely surrounding the electrostatic sensitive electronic components (24). Optionally, the interior surface of the channel 14 may contain an antistatic layer (27). Further optionally, the exterior surface of the container may contain a transparent protective layer (26).

Abstract: A method for degaussing a magnetic storage medium, such as a reel of magnetic tape, is disclosed. In the disclosed method, the reel of magnetic tape is simultaneously rotated on its axis and subjected to an applied transverse magnetic field substantially in the plane of the reel. The transverse magnetic field is applied first in one direction and then in the opposite direction. An axial magnetic field, substantially parallel to the axis of the reel, is then applied, first in one direction and then in the opposite direction. In the preferred embodiment, the step of applying an axial magnetic field includes applying axial magnetic fields in alternating directions at successively decreasing amplitudes. In the disclosed apparatus, the transverse magnetic field is obtained using a lateral coil which passes over and under the reel and covers about half the reel. The axial magnetic field is obtained using a ring-shaped coil surrounding the periphery of the reel.

Abstract: A semiconductor switching circuit using power MOS transistor as a switching element a drain thereof being connected to a DC power supply through a load and a source thereof being grounded. The power MOS transistor is protected from destruction due to an excessive power dissipation when the load is short-circuited.

Abstract: A control circuit for a magnetic probe. A power supply connects the available power to the direct voltages required to control electronic circuitry, and a voltage required for the magnetic probe. A clock establishes a time base for the entire device. A current alternator changes the direction of current flow through the magnet to change the polarity, and a pulse rate control sets the frequency with which the polarity is changed. The current alternator is variable to allow one polarity to remain for a longer time than the other, and to vary the timing for each. The frequency of the pulsing is counted, and the particular frequency is displayed in readable form.

Abstract: A corona generating device together with a coronode wire end block assembly is described, wherein the end block includes a spring member adapted for connection to a coronode wire which operates as a circuit breaker at the contact point of the end block thereby terminating the power supply, and preventing a potentially dangerous and destructive arcing situation in the event the wire ruptures. In a preferred embodiment the end block assembly comprises a conductive electrode having at one end a coronode contact and, at the other end a conductive plug adapted for engagement with a power supply contact, with the electrode being positioned in an electrically insulating holder between the coronode contact and the conductive plug. The conductive spring is mounted to the electrically insulating holder on one side of the coronode contact with the other end of the conductive spring being connected to the coronode wire.