초록 ▼

A surface delay device which exhibits good precision in delay timing when it is ignited from the side output of a low-energy detonating cord (LEDC) trunkline and end-initiates an LEDC trunkline or downline has a percussion-sensitive ignition charge wedged between the integrally closed end of a metal

A surface delay device which exhibits good precision in delay timing when it is ignited from the side output of a low-energy detonating cord (LEDC) trunkline and end-initiates an LEDC trunkline or downline has a percussion-sensitive ignition charge wedged between the integrally closed end of a metal shell and the end of a delay capsule, which houses the delay and priming charges. An orifice in the end of the delay capsule between the ignition and delay charges is kept free of the ignition charge, e.g., by providing an axial recess in the end of the shell extending at least as far as the orifice. In the field the end of a cord is fitted into a well which is seated in the main detonating charge, adapted to be initiated by the priming charge; and another cord is positioned transversely against the ignition end of the shell.

대표청구항 ▼

A nonelectric delay initiator comprising a first tubular metal shell integrally closed at one end and containing, in sequence from the closed end: (a) a percussion-sensitive ignition charge; (b) a tubular metal capsule having one open extremity and a closure at the other extremity provided with an a

A nonelectric delay initiator comprising a first tubular metal shell integrally closed at one end and containing, in sequence from the closed end: (a) a percussion-sensitive ignition charge; (b) a tubular metal capsule having one open extremity and a closure at the other extremity provided with an axial orifice therethrough, said capsule being nested within said first shell with its closed end innermost and seated against said ignition charge, substantially all of said ignition charge being wedged between said first shell and said capsule; (c) a delay charge of an exothermic-burning composition within said capsule at the orifice-containing closed end thereof; (d) a priming charge of a heat-sensitive detonating explosive composition within said capsule and adjacent to said delay charge; (e) a second tubular metal shell integrally closed at one end and positioned coaxially within said first shell in a manner such as to produce an annular spacing around said second shell; and (f) a main charge of a detonating explosive composition in said annular spacing and between the closed end of said second shell and said priming charge; means being provided for sealing off said charges from the atmosphere and for preventing the venting of gases resulting from the burning of said ignition and delay charges, an open cavity extending from one end to the other of said second shell for receiving a low-energy detonating cord adapted to be detonated by the pressure pulse applied thereto by the detonation of the main charge adjacent to said second shell, and said cavity being provided with a cord-retention means for holding said cord coaxially therein.