Abstract: An ignition system for the firing of a plurality of electrically actuable igniters (16) and methods for construction and use of the assembly. The ignition leading wire (17) of each electrically actuable igniter (16) is formed from a continuous length of insulated wire connecting its two electrical connection terminals. The leading wire is looped around a transformer core (14) having a movable portion (15) that is opened to admit the loop. A firing cable (12) coupled to a source of electrical firing energy (11) is also looped around the transformer core completing the formation of a transformer for coupling electrical firing energy from the source to each of the igniters to be fired. A plurality of transformer cores can be coupled to a single firing energy source by looping a continuous wire from the source, through each transformer and then back to the source, thereby electromagnetically coupling firing energy to each transformer.

Abstract: Disclosed is a binary electroexplosive device including an explosive lead and a pyrotechnic explosive which may be selectively positioned to initiate the explosive lead upon combustion of the pyrotechnic material. The pyrotechnic material is contained in an initiator assembly which may be inserted within a combination socket and housing which also holds the explosive lead facing the pyrotechnic material but spaced therefrom. Insertion of the initiator assembly within the socket completes electrical connections between a power source and a bridgewire within the initiator assembly embedded in the pyrotechnic material. In a particular embodiment shown, the electroexplosive device is utilized as a blasting cap for a well jet perforating gun wherein the gun may be completely assembled with the exception of the insertion of the initiator assembly in the socket.

Abstract: An electrically ignited load such as a fusehead is connected to the secondary winding of a transformer. The secondary winding is magnetically linked to a primary winding through a magnetic circuit and the transformer is constructed so as to provide a substantial leakage inductance associated with the secondary winding and effectively connected in series with the load to be ignited. The structure selectively passes electrical ignition energy to the load only in response to input electrical energy having predetermined magnitude and frequency characteristics.

Abstract: An ac initiation system which uses three ac transmission signals interloc for safety by frequency, phase and power discrimination. The ac initiation system is pre-armed by the application of two ac signals having the proper phases, and activates a load when an ac power signal of the proper frequency and power level is applied.

Abstract: In an electronic fuze for a projectile the ignition energy, upon firing of the projectile, is produced by a generator and stored in a storage capacitor. An electronic circuit serving for the barrel safety i.e. to prevent premature detonation of the projectile in front of the barrel, delaying ignition upon impact, the delay-free ignition upon impact and the self-destruction of the projectile, controls the delivery of the energy stored in the capacitor to the detonator or ignition cap. To ensure that the energy of the storage capacitor is sufficient the electronic circuit of the fuze must work with extremely low current. This is realized by providing for the circuit a stabilizer, a switching-on element, resetting elements, blocking elements and time-delay elements, the stabilizer and time-delay elements being structured as solid-state circuits.

Abstract: A fuze for projectiles having electronic circuitry therein for receiving radiated signals having a fusible link connected to the electronic circuitry for altering the operation of the electronic circuitry and a threshold detector for sensing the rupture of the link to place the fuze in a first mode of operation when the link is ruptured prior to firing of the projectile and in a second mode of operation when the link is ruptured within a predetermined time period subsequent to firing of the projectile.

Abstract: A method and device for the initiating of a number of electrical detonators by a blasting machine of the type in which a capacitor is charged, the level of the charge being measured by level-sensing units and detonators are initiating by the electrical energy stored in the capacitor by firing after the charge level has reached a given level. The charge level of the capacitor is limited to a range which takes into account the variations of the load between different initiation moments such that the current impulse provided to each detonator assumes a value between a minimum and maximum limit. The limits for each individual load within the operating range of the apparatus is regulated in accordance with the electrical and physical characteristics of the detonators so that safe initiation and a disburance-free firing process are obtained.

Abstract: An electric detonator cap has a casing, which accommodates an explosive detonator charge, an electrically ignitable means for firing the detonator charge, a chargeable and dischargeable electric energy source for igniting the firing means, and an electric circuit arrangement, including a controllable switch means connected between the energy source and the firing means, an electric delay circuit, and a decoder. The energy source is connectable via connecting wires extending out from the casing, to an electric current source for charging the energy source, and the decoder is electrically connectable to said connecting wires and is adapted upon receipt of a specific electric firing command signal supplied through said connecting wires to actuate the delay circuit in a manner to close the switch means after a predetermined delay time.

Abstract: This invention relates to an ignition circuit assembly for an explosive device of the kind in which an electric heating element is energizable from a transformer secondary winding to ignite the explosive. A transformer primary winding, which in use is magnetically coupled to the secondary winding, is contained in a casing, together with a generator circuit which is operable to energize the primary winding and an inhibiting circuit which inhibits operation of the generator circuit until a trigger signal is applied to the inhibiting circuit to cancel the inhibition.

Abstract: An electric detonator is fired by energy stored in the circuit upon arming f the system. A bridgewire grounds the trigger signal until sufficient input is present to blow out the bridgewire. The trigger signal then passes through a time delay circuit which gates a silicon controlled rectifier. This permits a closed circuit loop between the detonator and the stored energy.

Abstract: A method of manufacture of a tape reader utilizing spring contacts particularly adapted to ordnance use, wherein the spring contacts are closely and accurately spaced apart and comprise a reliable assembly of very few parts.

Abstract: A peelaway flat cable for providing electrical connection to a missile. First and second flat cables, each having a plurality of spaced conductors, are electrically connected together and are bonded to one another. A breakaway joint is provided in the cable to provide ready separation after the cable has performed its desired function.

Abstract: 1.