Aeci Limited

Peter Charles Seligmann

A circuit for use in the sequential initiation of explosives comprises an up-down counter having a first input terminal at which an up-count is initiated, a second input terminal at which a downcount is initiated, and an output terminal, an energy storage capacitor for powering the counter, a first resistor which has a low impedance for a fixed time to current of a particular value and of a first polarity and which thereafter has a high impedance connected to one of the input terminals of the counter so that when current of the first polarity and of the particular value is passed through the first resistor a signal is applied after the fixed time to the input terminal to initiate a count in an up direction, and a second resistor which has a low impedance to a predetermined voltage of a given polarity connected to the other input terminal of the counter so that when the predetermined voltage of the given polarity is applied to the second resistor a count is initiated in a down direction, the counter generating an output signal at its output terminal for actuating a detonator when the count in the down direction reaches zero.

Sequential initiation of explosives

A plug and socket connector and connection assembly formed by two mating plug and socket connectors. Each plug and socket connector comprises an insulator body of elastomeric material having a base partially encircled about its periphery by a wall extending vertically from the base and a peg extending vertically from the base. The peg is disposed in spaced relationship relative to the wall and defines an open socket between it and the wall. An electric contact pin is provided for each connector composed of the spirally wound core on the peg of the uninsulated terminal portion of an insulated lead wire positioned through the insulator body and its base. Each connector may comprise a plurality of pins, with corresponding pegs, if desired.

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Lombardy East, South Africa

Peter Charles Seligmann