Electrical timing arrangements and methods
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United States of America Patent
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-
Jul 16, 1991
Grant Date -
N/A
app pub date -
Nov 16, 1989
filing date -
Nov 18, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit arrangement for electrically firing a load, such as the rocket motor of a projectile, at a predetermined time after it has been ejected from a predetermined path (such as the barrel of a gun) comprises a capacitor which is charged up through bore-rider contacts sensing ejection of the projectile, a resistor and two diodes. A further diode blocks a capacitor discharge path in which the load is connected. Closure of the bore-rider contacts initiates two timers. These are of different type, so as to minimize the risk of double failure, and have the same predetermined time period. At the end of this period, they respectively close switches which abruptly shifting the potential on the positive plate of the capacitor to zero. The diode 32 in the capacitor discharge path is now unblocked and discharge current passes through the load and fires it.
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