F - Mech Eng,Light,Heat,Weapons – 42 – B
Patent
F - Mech Eng,Light,Heat,Weapons
42
B
102/37
F42B 3/16 (2006.01)
Patent
CA 1261202
A B S T R A C T An electric delay detonator 10 has a base charge 14, an ignition charge 16 and a fuse element 26 formed from a strip of zirconium. The zirconium strip 26 is forked at both ends having forks 36 which define an ignition portion and forks 34 which define a fuse portion. The forks 34 and 36 have a body portion 38 between them. The fuse portion is adjacent the ignition charge. The fuse element 26 is mounted in a carrier 24 by means of the forked portions 34 and 36. In one embodiment the forked portions 36 are attached to firing wires 28. In another embodiment the detonator has three forks 44.1, 44.2 and 44.3 at its ignition portion, two of the forks being connected to firing wires and the third fork being connected to a control wire. In a further embodiment one firing wire is connected to one end of the fuse element and the other firing wire to the other end. In still a further embodiment, a filament having an incendiary bead is connected to the firing wires, the bead being close to the ignition end of the zirconium strip. Finally there is a space between the fuse portion and the ignition charge to provide electrostatic protection with a bead of lead styphnate being provided on the fuse element to bridge the space and ignite the ignition charge. In use the zirconium strip is ignited at its ignition end and burns along its length at a controlled rate and after a predetermined period it ignites the ignition charge.
453408
Johannesburg Construction Corporation (proprietary) Limited
Sim & Mcburney
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