Abstract: An apparatus for detonating explosive charges at a given location in response to an initiation at a remote location and after a preselected delay comprises a non-electrical initiation device for generating a non-electrical energy input by detonation or pyrotechnical combustion at the given location and initiated at the remote location, and an electrical igniter also at the given location responsive to the initiation device for time-delayed ignition of the explosive charge. The electrical igniter includes a transducer for generating an electrical output signal in response to the non-electrical energy input, an electronic variable time delay igniter in close proximity to the transducer for setting a preselected time delay and for generating a time delayed electrical output signal and an igniter also in close proximity to the electronic time delay means for initiating the ignition of the explosive charge.

Abstract: A detonator for non-electric detonation systems for blasting charges intended to be initiated by a detonating fuse includes a passage provided in the body of the detonator for passing a detonating fuse through the passage. The detonator includes a conventional percussion cap which is immediately initiated by the detonating fuse for initiating the detonator. Also a booster charge intended for the detonator is provided with a reinforced central channel for the detonating fuse.