Abstract: A battery charge system for a transfer magnet (heretofore generally known as a lift magnet) and for a chuck control. In the case of the transfer magnet, the battery provides constant power, while in the case of the chuck control, it serves as a standby power. The charge system is automatically connected when the charge on the battery reaches a predetermined minimum, and disconnected when it is charged to a predetermined maximum. The battery in each case is connected with the usual utility source of AC, and upon the voltage of the battery reaching the levels mentioned, the AC source is respectively connected or disconnected.

Abstract: A system adapted to remotely control a transformer relay. The load switch of a transformer relay is controlled by controlling the direction of current flow in the secondary winding. A switch module is coupled with two wires to the secondary winding of the transformer relay providing a unidirectional current flow above a predetermined threshold in the secondary winding in response to a control signal. The unidirectional current flow may be selectively controlled in either direction or may be only purely unidirectional. A control module is then coupled to the switch module momentarily producing the control signal in response to an external stimulus. The switch module, the control module, or both draw a quiescent current from the secondary winding of the transformer relay when the switch module is not activated. The quiescent current is of an amount which is less than the predetermined threshold.

Abstract: A relay is activated by an A.C. signal that is supplied through two toroids, connected in series to a signal source. The signal is inductively coupled through each toroid and each toroid is controlled by a corresponding microprocessor. A voltage is applied to each toroid to drive it into a saturated state in which the signal is not transmitted through the toroid. The microprocessor supplies a signal to its respective toroid to drive it out of this saturated state. Both microprocessors simultaneously provide a signal that activates the A.C. signal source. Power to the relay is automatically discontinued if either microprocessor fails to provide the required coupling signals to the A.C. source or its respective toroid.

Abstract: A fuel injection system employs injectors having energizing coils and means for generating an actuating pulse to the injector. The system includes a correction means for applying a correction to the injector actuaing pulse to correct for the effect of at least one incidental system variable on the effective response of the injector to the actuating pulse. The incidental system variables are: the impedance of the energizng coil, the specific resistance of the wire used in the coil and the voltage supply in the fuel injection system. The correction means may be a constant current source drivng an output transistor biased to operate in a proportional conduction region.

Abstract: A contactless connector circuit for connecting two or more conductors with one another by means of reactance coupling, e.g., inductance coupling or capacitance coupling and transmitting electrical signals from one conductor to another by alternating current without contact between the conductors.

Abstract: A non-lethal protective system includes a defensive weapon, for example a gas canister, which may be rendered operative by means of actuating a remotely located electrical switch. Operation of the defensive weapon is effected by a solenoid which is controlled by a circuit including a pair of interlock switches which arm a main control switch.

Abstract: A flux concentrator has a pair of primary coils wrapped around a thin walled cylindrical portion of a secondary coil. The secondary coil has a conductive head at an end and the coil is slotted to generate a rapid high intensity axially acting flux at the head in response to a flow of current through the primary coils. A pulling force is generated as a result of a slow rise high amplitude current flow through one of the coils followed by a rapid rise reversed polarity current flow through the second primary coil.

Abstract: A system for supplying power to one or more electromagnets which includes a main power rectifier source and battery system including batteries charge controls and warning devices for one or more magnets such that in the event the main power source and/or the battery charger become inoperative power will be supplied to the magnets if energized at such time until the load on the magnet can be safely removed. Visual and/or audible indications are immediately given to the operator of the failure of either the main power rectifier or of the battery charger so that corrective and safety measures can be taken. A diode is provided between the battery and the load such that power flows from the battery only if the main power source voltage falls below that of the battery.