Abstract: A distributorless ignition system has an alternating current power source for providing power to fire the igniters. The alternating current power source is coupled through a capacitor to a plurality of ignition transformers, one transformer for each igniter. Each transformer has an electronic switch in its primary winding circuit initiated by independent logic means for each switch. A timer, driven by the engine, triggers one logic circuit at a time so that only one electronic switch and consequently one igniter is fired at such one time, maintaining the other logic circuits and electronic switches quiescent during such firing. The system has short lengths of high tension wires connecting each ignition transformer secondary winding to its respective igniter.

Abstract: The coil of a relay is activated by a DC voltage directly through a primary switch, which voltage is also applied through a diode to charge a capacitor. A transistor biased by the same DC voltage is connected across the charging diode, but poled for conduction in the opposite direction. When the power is removed from the relay coil and the charging diode, the transistor is forward biased and conducts the charge from the capacitor through the relay to keep the relay energized until such time as the capacitor charge equals the transistor bias; then the transistor cuts off and the relay opens immediately. Relay energization is independent of the transistor; if the transistor fails open, the relay is disenergized instantaneously; if the transistor fails shorted, the relay is deenergized when the capacitor voltage drops below the dropout voltage of the relay; therefore, the circuit is fail safe.

Abstract: An electrical circuit breaker comprising a pair of switches 40 connected in series in a power line L, a pair of drive coils 42 disposed adajcent the switches for electromagnetically repelling them when energized, and a remotely positioned transformer 44, 46 for energizing the coils, all disposed within grounded main and auxilliary tanks 38, 48 filled with a compressed, arc-suppressing gas. The primary winding of the transformer is energized by a storage capacitor 52 discharging through a spark gap 50 arced by a synchronous detector 62 and a pulse converter 58 in response to a line overage sensed by a coil 64 or an external control signal, and these latter components are disposed outside of the high voltage tanks.

Abstract: A fault indicator for alternating current distribution systems includes a pair of spaced pole pieces for receiving therebetween at one end the conductor and at the other end a pivoted permanent magnet carrying a target that is biased to a fault indicating position by a stationary permanent magnet. The pole pieces are demagnetized on flow of fault current in the conductor. They are remagnetized by a winding which is energized by discharge of a capacitor that is charged through a rectifier from an oscillator circuit. The winding is carried by a receptacle into which the other ends of the pole pieces are inserted and a circuit is completed thereby to charge the capacitor. The receptacle is carried at one end of a tubular housing the other end of which has an eye to receive a claw of a live line tool for applying the fault indicator to and removing it from the conductor.

Abstract: A pulse generator for energizing a coil with periodic bipolar current pulses of predetermined aplitude, period and repetition rate and of generally square wave form. The coil to be energized is connected in parallel with a capacitor to form a closed under damped tuned circuit of predetermined frequency. Current flowing through the coil is suddenly interrupted, causing a sinusoidal voltage to be generated across the tuned circuit. The current flowing through the coil rapidly changes according to a cosine function. At a time when the current has reached its maximum positive or negative value or slightly before, controlled rectifiers in the circuit between the power source and the tuned circuit are caused to conduct thus maintaining the current in the coil at a level substantially equal to the maximum value. At the end of a predetermined interval, the supply of direct current to the tuned circuit again abruptly is interrupted, thus defining another edge of a pulse.

Abstract: An electromagnetic force (EMF) machine with a universal portable power supply is disclosed. The universal portable power supply energizes either a multiple turn flux concentrator or a single turn flux concentrator. The flux concentrators produce magnetic fields that create an outward tension force adapted to perform non-destructive bond tests (tension proof loading) and/or dent removal operations on panels or the like. The power supply includes a slow current pulse subsystem; a fast current pulse subsystem; slow and fast crowbars; and, a firing control. The firing control controls the production of pulses by the slow and a fast current pulse subsystems, and, the operation of the slow and fast crowbars. The slow pulse subsystem, via the flux concentrator, slowly creates a magnetic field that penetrates the panel; the fast pulse subsystem, via the flux concentrator, rapidly decreases the magnetic field, whereby a negative field gradient is produced across the panel.

Abstract: A drive circuit for a solenoid pump comprises a series combination of a pump solenoid and a capacitor connected through a rectifier circuit with an a.c. source. The solenoid is shunted by another rectifier poled to pass a charging current to the capacitor. A thyristor is connected across the series combination, and is triggered into conduction, whereupon it short-circuits the series combination to permit a discharge of the capacitor through the solenoid and to prevent a current flow from the source to the capacitor, thus allowing a uniform control of the energy discharged by the capacitor. A trigger circuit for the thyristor comprises a relaxation oscillator including a programmable unijunction transistor, the conduction of which is controlled inversely to fluctuations in the source voltage.

Abstract: A control switch has a switch shaft carrying radially positioned contacts and mounted for reciprocal rotational movement about its axis. A cam profile is fixed to the shaft and has first and second opposed cam surfaces. A driver is mounted to selectively engage the first or second cam surface to drive the switch shaft into a first clockwise position or a second counterclockwise position by remote actuation. The driver is connected to a rotary solenoid and a linear solenoid which allow uni-directional drive translated into two directional drive by the driver.One form of control circuit operates a rotary solenoid and a linear solenoid through a trip and close switch. A first relay is responsive to actuation of the trip switch means or close switch means to energize the rotary solenoid and index the switch shaft to a preselected position holding that position for a preselected time after which the shaft returns to its original position regardless of whether or not the trip switch or close switch are deactuated.

Abstract: An automatic resetting subcircuit is disclosed in a remotely actuated power distribution switch control circuit characterized by a two-position electromechanical control for an automatic actuation mechanism for operating the switch. The control is provided with two elements, each for moving the control in an opposite direction between the open and closed positions of the switch. The circuit includes a first energy storage capacitor for storing energy received from a source remote from the circuit. A first thyristor, when triggered by a locally generated control signal, applies the energy stored in the first energy storage capacitor to one of the elements to cause the switch to be operated in a predetermined direction. The automatic resetting subcircuit includes a second energy storage capacitor for storing energy received from the remote source with the second energy storage capacitor being electrically isolated from the first thyristor.

Abstract: A magnetic control device comprising one pair of permanent magnets cooperating with armatures to form first and second air gaps and, means for inverting the direction of magnetization of one magnet. In a first direction of magnetization, the flux closes through the first air gap, while, in the opposite direction, the flux is at least partially cancelled in the first air gap and passes through the second air gap, which is substantially smaller than the first air gap. Such a device is adapted to actuate a two way valve.

Abstract: A circuit for energizing a fuel injector valve coil in response to a fuel injection pulse including a storage capacitor which is charged from a relatively high voltage source and which is discharged through the fuel injector valve coil through a controlled rectifier gated conductive upon the initiation of a fuel injection pulse signal. The charging circuit for the capacitor is disabled upon initiation of capacitor discharge for a time period at least greater than the time for the capacitor discharge current to decrease to a value to effect commutation of the controlled rectifier after which capacitor charging is reinitiated. A holding circuit is provided for holding the fuel injector valve coil energized for the duration of the fuel injection pulse signal.

Abstract: A control switch has a switch shaft mounted for reciprocal rotational movement about its axis. A cam profile is fixed to the shaft and has first and second opposed cam surfaces. A driver is mounted to selectively engage the first or second cam surface to drive the switch shaft into a first clockwise position or a second counterclockwise position by remote actuation. The driver is connected to a rotary solenoid which allows uni-directional drive translated into two directional drive by the driver.A control circuit provides rapid actuation and slow release of the rotary solenoid along with operation of a linear solenoid when desired to select between first and second directional movement of the cam profile. The control circuit permits charging a capacitor while rapidly actuating a relay to actuate the rotary solenoid. A resistor provides for slow discharge of the capacitor to maintain the relay actuated over a slow release period after disruption of the charging circuit.

Abstract: The invention relates to a device for generating a time-dependent current in a coil, for example, a magnetic coil. Such a magnetic coil can be used, in combination with a second coil of this kind, for generating rotary magnetic fields in a device for transporting magnetic bubbles along a bubble guide structure consisting of discrete elements on a plate of magnetic material. The device comprises two or more current connection terminals, an LC oscillator circuit, a switching element connected in series with the coil, and a control unit.

Abstract: A separate electronic switch controls energization of each of a plurality of parallel connected electromagnetic targets. An additional electronic switch controls energization of a circuit breaker trip solenoid. The individual trigger circuits for each target switch are common with the trigger circuit for the trip solenoid switch, such that a trigger signal to any one of the target switches is also applied to the solenoid switch to achieve concurrent, but independent energization of the associated target and the trip solenoid.

Abstract: A plurality of control stations spaced along conductor lines; a normally closed disconnect switch at each station for connecting or disconnecting said conductor lines; a fault detector at each station; a status indicator at each station to indicate the status of said fault detector and of said disconnect switch; an electrically actuated indicator device remote from said stations; remote power source; and remote control selector means for selectively connecting the status indicator of a selected station to said indicator device for indicating the status of said fault detector and of said disconnect switch; said selector means being also capable of connecting said remote power source to the disconnect switch a selected station for opening or closing said disconnect switch.

Abstract: Energization of a motor is controlled by a latching relay operated by switch means passing current from a capacitor to the winding of the relay. The capacitor is charged through a relatively large impedance unipolarity input.

Abstract: A phototransistor is coupled to a relay coil and the base of a switching transistor. Light impinging on the phototransistor will cause it to conduct, switching on the transistor causing current flow in the relay coil. Fluctuating light intensity on the phototransistor will cause a corresponding fluctuation of current in the relay coil. A predetermined level of current in the coil will maintain the relay closed.

Abstract: An arrangement for the production of a magnetic rotary field with the help of a crossed coil pair of separate capacitance connected across each of said coils to form respective parallel resonant circuits each of which is in series with a timing circuit, a controllable voltage source and a resonant circuit switch. A timing pulse succession is fed into a program generator which supplies two 90.degree. phase shifted groups of pulses respectively consisting of starting pulses, stopping pulses, and operational pulse successions. A first switching stage is controlled in each group by the starting and stopping pulses. The first switching stage is connected ahead of the resonant circuit in series with a controllable voltage source.

Abstract: A circuit providing a means of transferring and storing the energy from the collapsing field of a deenergized inductive load to a capacitor, and subsequently delivering this energy back to the inductive load to aid in its re-energization. A first circuit path is provided for transferring the energy from the inductive load to the capacitor, and a second circuit path is provided for transferring the energy from the capacitor to the inductive load, said second circuit path including a signal translating device, the conductivity of which is controlled by the charge on the capacitor at the time re-energization of the inductive load is initiated.