Coreless-coil shock tube package system
View Patent ↗A coreless-coil shock tube package system includes a “coreless” bundle of shock tubing, meaning that the tubing is not wrapped around a spool. The bundle may be a generally cylindrical coil of shock tubing. Optionally, two washer-like end plates abut the ends of the tubing coil for axial support. A layer of shrink-wrap or other polymer film partially covers the coil and end plates. A detonator is attached to one end of the tubing and lies tucked into the coil, through an end plate, for storage and transport. An igniter is attached to the tubing's other end. In use, the detonator is removed from the coil and attached to an explosive device. Then, the package is pulled away from the detonator and explosive, thereby uncoiling the tubing through the end plate for deployment. The igniter is actuated for igniting the shock tubing and activating the detonator and explosive.
1. A shock tube package system comprising:
a generally cylindrical coil of shock tubing having a lateral side surface and two end surfaces, said cylindrical coil of shock tubing defining a longitudinal open interior space;
an envelope covering the lateral side surface and at least part of both end surfaces of the bundle of shock tubing;
first and second end plates respectively abutting the end surfaces of the coil of shock tubing and disposed between the coil and envelope, the first end plate having a central opening for accessing the interior space, and a first end of the shock tubing being accessible through the central opening in the first end plate;
a shock tube device operably connected to the first end of the shock tubing and tucked into the interior space of the coil of shock tubing through the central opening in the first end plate; and
a second shock tube device operably connected to a second end of the shock tubing and attached to an outside of the envelope.
2. The shock tube package system of claim 1 wherein:
the second end plate is provided with an outer notch for facilitating passage of the second end of the shock tubing between the envelope and second end plate.
3. The shock tube package system of claim 1 wherein:
the second shock tube device is attached to the outside of the envelope by a second envelope.
4. The shock tube package system of claim 1 wherein:
the coil of shock tubing defines a longitudinal open interior space;
a first end of the shock tubing is accessible through the interior space; and
the system further comprises a shock tube device operably connected to the first end of the shock tubing and tucked into the interior space of the coil of shock tubing.
5. The shock tube package system of claim 4 further comprising:
a second shock tube device operably connected to a second end of the shock tubing and attached to an outside of the envelope.
6. The shock tube package system of claim 5 wherein:
the second shock tube device is attached to the outside of the envelope by a second envelope.
7. The shock tube package system of claim 1 wherein the envelope is a polymer envelope comprising at least one layer of heat shrink wrapping.