Detnet South Africa (pty) Limited

Dyno Nobel Inc.

Richard Joseph Michna

Andre Louis Koekemoer

Christopher Malcolm Birkin

Michiel Jacobus Kruger

Daniel Auguste Maurissens

Tyson James Plitt

Mark Ivan Jurras, Iii

Paul Richard Strebel

Daniel Auguste Maurlssens

A detonator which is responsive to a shock tube event which is validated if a link is fused at a predetermined time interval after a light signal produced by the event is detected and if, at the end of a subsequent time interval, the link is still fused and the light signal is absent.

Method of validating a shock tube event

A detonator assembly method wherein a base charge is placed into a tube to abut a closed end of the tube, an electronic module is positioned inside the tube, a displacement member with a stop formation is used to move the module, against a frictional restraining force, to a location at which the stop formation abuts a rim of the tube and wherein the module is held in position by deforming the tube into engagement with the module.

Method of assembling a detonator

A detonator which includes a housing which has a passage with an inlet and an outlet and which is of reducing cross sectional area from the inlet to the outlet and wherein the inlet is configured to be exposed to an end of a shock tube, and a fusible link is located at the outlet.

Detonator sensing arrangement

A detonator which includes a tube with an open end, a shock tube, secured to a plug which is fixed to an open end of the tube, an electronic module inside the tube, the module including a substrate which carries electronic components, and sensing structure mounted to the substrate spaced from an opposing end of the shock tube.

Detonator construction

A booster explosive () comprises a canister bodywithin which is a cap well () having disposed therein a detonator (). A protective sleeve () encloses the cap well () except for that portion of the cap well, the active portion (), which encloses the explosive end section () of detonator (). The protective sleeve serves to attenuate the force of shock waves from nearby prior explosions acting on the detonator (). An annular air space () may be provided between protective sleeve () and cap well () to further attenuate the force of such shock waves. Attenuation of the shock waves reduces the likelihood of damage to detonators () by prior nearby explosions.

Growing community of inventors

Barkhamsted, CT, United States of America

Richard Joseph Michna