Mine-actuating system using one-shot mv timing circuit and timed mv feedback inhibitor

Claim 1

A mine actuating system for detonating a plurality of mines upon receiving a plurality of electrical pulses from a proximity detector comprising: an eleCtronic gating means having an input terminal and an output terminal operatively responsive to said first three electrical pulses of said proximity detector, for providing an initiating voltage pulse, which includes; a first mono-stable multivibrator having an input terminal and an output terminal, said input terminal electrically coupled to a common input junction; a first ''''And '''' gate having three input terminals, an inhibit input terminal, and one output terminal, a first of said three input terminals electrically connected to said first monostable multivibrator output, a second of said three input terminals electrically connected to said common input junction; a second ''''And'''' gate having a first input electrically coupled to said common input junction, a second input electrically coupled to said first mono-stable multivibrator output terminal, and an output terminal, said ''''And'''' gate provides an output when the second input voltage pulse is present, at said input terminals of the second ''''And'''' gate, at the same time that the first mono-stable multivibrator is operating; a second mono-stable multivibrator having an input terminal electrically coupled to the output of said second ''''And'''' gate, an output terminal electrically connected to a third input terminal of said first ''''And'''' gate permitting said first ''''And'''' gate to provide an output at its output terminal, the coincidence of pulse voltage on said first, second and third input terminals of said first ''''And'''' gate actuates said inhibiting means and said fire control means; means for temporarily inhibiting said gating means electrically coupled to said gating means after said gating means is responsive to said first three pulses; and fire control means, electrically coupled to said gating means output, for sequentially firing a plurality of electrically connected electro-explosive devices.