Abstract: A reliable delay detonator device is disclosed which is thermally and chemically stable and which is also insensitive to mechanical shock and electrostatic charge. The device can be made with differing time delays and can be interconnected with other detonator devices for achieving multiple delay characteristics. A modification of the device is particularly suited to high temperature use. None of the devices contain any primary explosives, the device relying upon pyrotechnic delay materials and secondary explosives.

Abstract: A reliable delay detonator device is disclosed which is thermally and chemically stable and which is also insensitive to mechanical shock and electrostatic charge. The device can be made with differing time delays and can be interconnected with other detonator devices for achieving multiple delay characteristics. A modification of the device is particularly suited to high temperature use. None of the devices contain any primary explosives, the device relying upon pyrotechnic delay materials and secondary explosives.

Abstract: A reliable low voltage, electrically actuated, all secondary explosive detonator device is disclosed which is thermally and chemically stable and is relatively insensitive to shock and electrostatic charge. The device includes a cylindrical body having a chamber containing a donor secondary explosive, an elongated bore extending from the donor explosive to an acceptor secondary explosive, with a generally flat annular shoulder located at the junction of the bore and the chamber, an impactor disc positioned within the chamber against the shoulder and blocking the bore and low voltage electrical deflagration initiating means positioned within the chamber and extending outwardly of the body. Application of low voltage current to the conductors initiates deflagration of the donor explosive so that the central portion of the impactor disc is sheared and accelerated through the bore striking the acceptor explosive with sufficient velocity to detonate the acceptor explosive.