F - Mech Eng,Light,Heat,Weapons – 42 – D
Patent
F - Mech Eng,Light,Heat,Weapons
42
D
342/47
F42D 1/06 (2006.01)
Patent
CA 1234205
A B S T R A C T This invention relates to sequential blasting utilising electronic circuitry to steer detonating pulses to suc- cessive detonators. Modules are provided which contain a two-terminal element that has the characteristic that in its first normal state it has a high resistance in at least one direction and it may be changed into a second state in which it has a low resistance in both direc- tions by a suitable pulse. Further, a detonating signal does not flow from one power line to the other through the particular module that is being addressed, but from one side of one module through a connecting link and then through the other module. Thus, each module has an input steering terminal and an output steering terminal, with the output steering terminal of each module connec- ted to the input steering terminal of the next module. Then, in use, current flows from one power line to a power terminal of one module, through its output steer- ing terminal to the input terminal of the next module, through that module and to the other power line. Thus, with each detonating pulse, a detonator is fused and one of the elements passes into its second conducting state. As the detonator goes into a non-conducting configura- tion the next pulse is steered via the element that is now conducting to the next module.
469085
Johannesburg Construction Corporation (proprietary) Limited
Sim & Mcburney
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