Mining method

专利名称：Mining method

发明人：Stafford A. Smithies,Raymond C. Atkins申请号：US07/069210申请日：19870701公开号：US04796531A公开日：190110

摘要：System for the electrical sequential initiation of explosions comprising a seriesof initiating modules connected to one another and connectable to a power supply, and acorresponding series of electrically actuable initiators. Each initiating module isconnected to an initiator and embodies a non-latching switch for actuating the initiatorassociated with that initiating module. The non-latching switch comprises a solid stateelectronic device having an emitter, a gate and a collector, and comprises a short circuitbetween the gate and the emitter for holding the device in an \"off\" state to a voltageapplied to the collector. The device also comprises an open circuit between the gate andthe emitter for turning the device \"on\" to a voltage applied to the collector, while adiode integrated on the device blocks a reverse supply voltage. The non- latching switchof each initiating module save the first in the series is connected to the initiatorassociated with the preceding initiating module in the series. The arrangement is suchthat, in operation of the system, the non-latching switch of each initiating module isdisabled until the initiator associated with the preceding initiating module in the serieshas been actuated by that initiating module. The initiating modules in the series areactuable sequentially by the power supply so as to sequentially initiate the series ofinitiators.

申请人：GERNAL MINING UNION CORPORATION LIMITED

代理机构：Armstrong, Nikaido, Marmelstein & Kubovcik

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