Dual safing for base element fuze

Details Dual safing for base element fuze Dual safing for base element fuze

1984-12-17

1986-08-05

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Ignition or detonation circuit

102209, 102254, 102256, F42C 1540

Patent

active

046036350

ABSTRACT:
A base element fuze having dual safing is disclosed. The fuze is useful with an explosive type shell propelled into a ballistic trajectory from the barrel of a gun. The fuze is actuated to move from first safety to the armed condition after experiencing the inertial setback forces of gun firing followed by the drag forces of deceleration during the ballistic flight phase before target impact. The firing circuit contains an inertial magnetic power supply or setback generator which produces a voltage pulse when the gun is fired, a storage capacitor to receive and store the pulse which is later used to initiate a detonator, and switch closure interface circuitry encircuiting the capacitor with the detonator at target impact. The sequence of events within the fuze is programmed by a spring driven rotor which is latched in first safety when assembled, is released when the gun fires, and moves to the armed position in about 18 ms. To protect against the possibility that the rotor may have become unlatched and in the armed condition at firing of the gun, a normally open relay is encircuited across the capacitor. A notch in the face of the rotor is positioned such that it will allow shell acceleration down the gun barrel to bring about closing of the relay contacts and thereby rapidly and harmlessly dissipate the charge generated by the setback generator. Secondly, a G-switch is added between one side of the capacitor and the first side of the electrical detonator element. The G-switch maintains an open circuit between the capacitor and the detonator during the time the shell is accelerating down the gun barrel. Only after the shell leaves the gun barrel and begins to slow down due to its encounter with the air, will the G-switch close to enable detonation to take place.

REFERENCES:
patent: 2647465 (1953-08-01), Rabinow
patent: 3140662 (1964-07-01), Zaugg
patent: 4407201 (1983-10-01), Jensen

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