US 7,320,285 B1
Safe and arm device and method of using the same
Terrence Lane Munsinger, Ridgecrest, Calif. (US); and David L. Riggs, Ridgecrest, Calif. (US)
Assigned to The United States of America as represented by the Secretary of the Navy, Washington, D.C. (US)
Filed on Mar. 31, 2005, as Appl. No. 11/100,234.
Int. Cl. F42C 15/32 (2006.01)
U.S. Cl. 102—229  [102/225] 11 Claims
OG exemplary drawing
 
1. A safe and arm detonation device comprising:
a housing;
a cylindrical low pressure chamber located within said housing, said low pressure chamber having an interior first end and an interior second end;
a high pressure diaphragm in contact with said interior first end of said low pressure chamber;
a high pressure channel connecting said high pressure diaphragm to a high pressure inlet port wherein said high pressure inlet port is exposed to an atmospheric pressure;
a piston having a first end in direct contact with said diaphragm and a second end in direct contact with a first end of a biasing spring;
a second end of said biasing spring being in direct contact with said interior second end of said low pressure chamber;
a low pressure channel connecting said low pressure chamber to a low pressure vent wherein a needle valve is positioned within said low pressure channel;
a cylindrical shaft extending through an exterior wall of said housing, passing through said low pressure chamber and protruding into a cylindrical rotor chamber wherein said cylindrical rotor chamber is within said housing;
a firing pin axially aligned within said cylindrical shaft and said firing pin having a shear pin passing through said firing pin where said shear pin is anchored to said cylindrical shaft, said firing pin having a sealing plug connected to said firing pin;
said cylindrical rotor chamber having a first interior end and a second interior end;
a piezo electric crystal unit mounted to said second interior end of said rotor chamber and axially aligned with said firing pin wherein said piezo electric crystal unit is electrically connected to a plurality of electrically initiated detonators when said safe and arm detonation device is in an armed mode;
a disk shaped rotor rotatably mounted in said rotor chamber, said disk shaped rotor axially aligned with said cylindrical shaft and having mounted thereon said plurality of electrically initiated detonators;
a plurality of shorting contacts mounted on an interior wall of said rotor chamber and electrically connected to each of said electrically initiated detonators when said safe and arm detonation device is in a safe mode; and
a drive spring coupled between said piston and said rotor.