Safety circuit for electric detonator element

Details Safety circuit for electric detonator element Safety circuit for electric detonator element

1985-08-30

1988-09-06

Leung, Philip H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 1022024, H02H 904

Patent

active

047697342

ABSTRACT:
A safety circuit for an electric detonator element connected to two electrical leads and having a subsequently arranged detonable charge. The safety circuit includes an electrical component connected in parallel to the detonator element between the two leads, the electrical component having an initial condition wherein the electrical component is at least substantially electrically non-conductive. The electrical component is responsive to a signal having a voltage value above a maximum ignition voltage value for enabling triggering of a detonator element for being converted from the initial condition thereof to a final condition wherein the electrical component provides a short circuit path in parallel to the detonator element so as to prevent improper initiation of the electrical detonator element.

REFERENCES:
patent: 3793535 (1974-02-01), Chowdhuri
patent: 3934175 (1976-01-01), Clark
patent: 3986560 (1976-10-01), Heath et al.
patent: 4061088 (1977-12-01), Ueda
patent: 4393779 (1983-07-01), Brede et al.
patent: 4520419 (1985-05-01), Locher et al.
patent: 4563720 (1986-01-01), Clark
patent: 4584622 (1986-04-01), Crosby et al.
patent: 4587588 (1986-05-01), Goldstein

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