초록 ▼

A carrier for supporting a primer explosive charge in operative relationship to initiating means therefor comprises a cup having a recessed portion in its closed bottom end for engaging an explosive-containing plastic connecting block, used to explosively couple a low-energy detonating cord (LEDC),

A carrier for supporting a primer explosive charge in operative relationship to initiating means therefor comprises a cup having a recessed portion in its closed bottom end for engaging an explosive-containing plastic connecting block, used to explosively couple a low-energy detonating cord (LEDC), threaded through a tunnel in the cup, to a percussion-actuated detonator seated in a cavity (cap well) in the cup. A number of such primers can be made to slide on a single LEDC downline for placement in decked explosive charges in a borehole. Two tubular members project into the cup from the recessed portion, forming one or two cord-threading tunnels and a cap well. Besides initiation of a detonator by an LEDC downline via the explosive coupler, the carrier allows the primer charge to be initiated by a high-energy detonating cord or an electric detonator in an axial tunnel in the cup, or by a length of LEDC threaded through a tunnel and connected to a non-electric detonator seated in the cap well.

대표청구항 ▼

A carrier for supporting a primer explosive charge in operative relationship to an initiating means therefor, said carrier comprising a cup having (a) an open top end and a closed bottom end, said bottom end being provided with a recessed portion; (b) first and second tubular members projecting into

A carrier for supporting a primer explosive charge in operative relationship to an initiating means therefor, said carrier comprising a cup having (a) an open top end and a closed bottom end, said bottom end being provided with a recessed portion; (b) first and second tubular members projecting into said cup from said recessed portion on axes substantially parallel to said cup\s longitudinal axis, (1) the first of said tubular members having an open top end located in the vicinity of said cup\s open top end and an open bore which extends from said first tubular member\s top end and terminates at the bottom end of said cup in said recessed portion so as to form an opening therein and a first threading tunnel in said cup, and (2) the second of said tubular members having (A) a closed end located inside said cup and a bore which extends from said closed end and terminates at the bottom end of said cup in said recessed portion so as to form an opening therein and a detonator-positioning cavity in said cup, or (B) an open top end located in the vicinity of said cup\s open top end and an open bore which extends from said second tubular member\s top end and terminates at the bottom end of said cup in said recessed portion so as to form an opening therein and a second threading tunnel or a detonator-positioning cavity in said cup; and (c) means in said recessed portion for engaging an explosive-containing plastic connecting block.