Shock Tube Systems, Inc.

Detotec North America, Inc.

John P O'Brien

Stephen W Bartholomew

Timothy J O'Brien

Thomas A Nadeau

A Jonathan Bawabe

Raymond G Niederwerfer

A small diameter shock tube of unique internal surface configuration such that the powder loading per meter of tubing can be higher than achieved with conventional shock tube. The outside diameter of the tube is less than 0.10&#x2033;, preferably 0.085&#x2033; with inner and outer layers of different polymeric material bonded together in a coextrusion process. The inside surface of the shock tube has radially inwardly projecting ribs or protuberances that result in an increase of the internal perphi of the inner surface cross section achieving a 30% increase so that powder loading per meter of the tube can be kept in a safe range.

Signal transmission fuse

A block molded from a polymeric material has a through passageway to contain a percussive shock wave. Angularly related channels communicate with the containment passageway for receiving arcuate segments of detonation cord. Alignment of a plurality of blocks provides a convenient packaging setup for the cord. A percussive signal traveling along the cord can be short-circuited in the packaging setup. A diode version of the block can react to the signal in a given direction of travel.

Diode cutoff and safe packaging system for detonating cord

Percussive signal transmission tubes, of contrasting color, are joined along adjacent longitudinally extending portions by an adhesive bead of polymeric material. The tubes can be separated in the field and are provided on spools without any sheath. A small diameter (0.10 inch) tube can be used to reduce the size of the spool, or increase the length of tubing wound on the spool. An apparatus for assembling the product is also disclosed.

Redundant signal transmission system and development method

Redundant signal transmission system and deployment means

An in-line initiator and firing device assembly includes a shock tube assembly. An in-line initiator is provided for initiating a shock wave along the shock tube assembly, and includes an end sleeve having a bore extending between input and output ends. At least a portion of a surface defining the bore toward the output end of the end sleeve is threaded for threadably receiving and forming threads on an outer surface of the input end of the shock tube assembly. A first retaining device is associated with the end sleeve for receiving a shock wave triggering device and securing the triggering device to the input end of the end sleeve. A firing device assembly is activated by a shock wave transmitted through the shock tube assembly. The firing device includes a barrel having a bore extending between input and output ends. The input end of the barrel communicates with the output end of the shock tube assembly and the output end communicates with a firing device. A firing pin piston is movably disposed within the bore of the barrel, and defines a cavity communicating with the input end of the barrel for storing a propellant charge to be initiated by shock waves transmitted from the shock tube assembly. A second retaining device is associated with the barrel for coupling the firing device to the barrel.

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Pawcatuck, CT, United States of America

John P O'Brien