Title: Safe rocket motor igniter using sequenced initiation to an explosive logic network

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Claims: What is claimed is:

1. A safing apparatus for use in fail safing a squib used to fire a rocket motor comprising:

a support plate of inert material having first and second continuous uniform explosive trails formed thereon;

first and second electrically actuated igniting means attached to said first and second explosive trails respectively;

said first explosive trail branching at an angle of 30 degrees or less into a curved branch and a straight branch with said curved branch meeting said straight branch in a first right angled junction at their extremities to form a single first output explosive trail;

said second explosive trail branching into a first and second time delay means with said first time delay means meeting at its extremity said first explosive trail straight branch to form a second right angled junction;

said second time delay means having a substantially longer time delay than said first time delay means and meeting at its extremity said first output explosive trail to form a third right angled junction;

transfer charge means attached to said first output explosive trail and to a squib for firing said squib upon the arrival of a detonation wave at said transfer charge;

said safing apparatus operative to provide said detonation wave along said first output explosive trail only when said first and second ignition means are electrically actuated in a predetermined time sequence.

2. The safing apparatus of claim 1, and further including a third continuous uniform explosive trail formed on said support plate, and

a third electrically actuated igniting means attached to said third explosive trail, and

said first output explosive trail branching into a curved branch and a straight branch with said curved branch meeting said straight branch in a fourth right angled junction to form a single second output explosive trail, and;

said third explosive trail branching into a straight branch and a third time delay means with said third time delay means having substantially longer length than said straight branch and meeting at its extremity said first output explosive trail to form a fifth right angled junction and

said third explosive trail straight branch meeting at its extremity said first output explosive trail straight branch to form a sixth right angled junction and

said transfer change means attached to said second output explosive trail, and

said safing apparatus operative to provide said detonation wave along said second output explosive trail only when said first, second and third igniting means are electrically actuated in a predetermined time sequence.

Other info:

Inventors: Anderson, Matthew E. (China Lake, CA, US)
Menz, Fredric L. (Ridgecrest, CA, US)

Application Number: 501101
Filing Date: 1974-08-27
Publication_date: 1976-08-10
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Class(es): 102/202 102/200, 102/306, 102/701
Other Classes:
US Patent Ref:

3392673	Jul, 1968	King	102/70.
3430564	Mar, 1969	Silvia et al.	102/DIG.
3703865	Nov, 1972	Gilbertson et al.	102/DIG.
3753402	Aug, 1973	Menz et al.	102/DIG.
3768409	Oct, 1973	Menz et al.	102/DIG.

Other Refs:
Primary Examiner: Pendegrass, Verlin R.
Assistant Examiner:
Attorney: Sciascia; R. S., Miller; Roy