Alternate signal path isolation member and non-electric detonato

Details Alternate signal path isolation member and non-electric detonato Alternate signal path isolation member and non-electric detonato

1994-10-21

1996-03-26

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Fuse cord

1022753, 10227512, C06C 504, C06C 700

Patent

active

055011519

ABSTRACT:
An isolation member (34) for use in a non-electric detonator cap (10) is of substantially cylindrical shape and has an interior passageway (40) extending therethrough and defining a positioning region (44) and a discharge port (56). Positioning region (44) is dimensioned and configured to snugly receive and seat therein a signal transmission line (30) and to orient the signal-emitting end (30a) thereof to aim along the longitudinal axis of cap (10) through a diaphragm (42) at the target provided by receptor charge (14). The isolation member is positioned between, and spaces the signal-emitting end (30a) of the signal transmission line (30) from, the receptor charge (14) contained in the detonator cap. The isolation member comprises grooves (58, 58a, 58b) to provide an alternate flow path through which a signal emitted by the discharge end (30a) of a signal transmission line (30) can reach the receptor charge (14) should the signal fail to burst the diaphragm (42 ). The isolation member is preferably made of a semi-conductive material to bleed off to the shell (12) any static electricity charges transmitted through the signal transmission line (shock tube 30) so as to prevent static discharge initiation of the charge.

REFERENCES:
patent: 3981240 (1976-09-01), Gladden
patent: 4742773 (1988-05-01), Bartholomew et al.
patent: 5031538 (1991-07-01), Dufrane et al.
patent: 5365851 (1994-11-01), Shaw
Drawing No. 92C 349D of The Ensign-Bickford Company.

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