IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0692357
(2003-10-24)
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발명자
/ 주소 |
- Wong,Roger S.
- Rand, Jr.,Henry T.
- Ranu,Jeff
- Oakley,Charles William
- Ivankoe, Jr.,Michael E.
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출원인 / 주소 |
- The United States of America as represented by the Secretary of the Army
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인용정보 |
피인용 횟수 :
10 인용 특허 :
9 |
초록
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A new mechanism substantially reduces the vulnerability of explosive load munitions to thermal stimuli, such as fire or heat during transport and storage, thus enhancing personnel safety and the survivability of adjacent munitions. The mechanism includes a threaded fuze adapter made of plastic and h
A new mechanism substantially reduces the vulnerability of explosive load munitions to thermal stimuli, such as fire or heat during transport and storage, thus enhancing personnel safety and the survivability of adjacent munitions. The mechanism includes a threaded fuze adapter made of plastic and having a melting temperature that is lower than the auto-ignition temperature of the explosive. The adapter secures a fuze or metal closing plug to an explosive loaded projectile and is designed to permit venting of combustion gases through the nose of the projectile upon auto-ignition of the explosive, thereby preventing detonation of the explosive and fragmentation of the projectile body. A plastic or metal ring is utilized to support the body of an explosive loaded projectile within a fiberboard packing tube, thus allowing the fuze to readily separate from the projectile body upon the melting of the plastic threaded fuze adapter and subsequent combustion of the explosive during an unplanned thermal stimulus event. An intumescent coating is deposited on the metal ammunition container that is used to package explosive loaded cartridges, to reduce the rate of thermal stimuli to the munitions, thereby ensuring that the plastic fuze adapter of the present invention reaches its melting temperature prior to the explosive attaining its auto-ignition temperature.
대표청구항
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What is claimed is: 1. A system of explosive loaded projectiles protected from chain explosion caused by possibility of fire, with reduced probability of accidental detonation of the projectiles when subjected to an unplanned thermal stimulus, comprising projectiles that have: a projectile body hav
What is claimed is: 1. A system of explosive loaded projectiles protected from chain explosion caused by possibility of fire, with reduced probability of accidental detonation of the projectiles when subjected to an unplanned thermal stimulus, comprising projectiles that have: a projectile body having a forward end, an aft region, and an inner surface, said forward end having a cylindrical opening for placement of a fuze, said opening having internal threads disposed therein, said projectile body having explosive disposed within the inner surface thereof; said fuze comprising a plug end, said plug end having external threads thereon; an annular cylindrically shaped ionomer plastic member, said plastic member having external threads which are sized so as to mate with said internal threads of said projectile body cylindrical opening, and said plastic member having internal threads to match the fuze plug external threads, said plastic member being disposed wholly internal to said fuze body cylindrical opening annuarly surrounding said plug region of said fuze, so as to secure said fuze to said projectile body and support the fuze therein, wherein said plastic member softens at a temperature substantially below the auto-ignition temperature of said explosive and by a factor of at least 40% below such auto-ignition temperature, said plastic member softening at a temperature of 200 degrees Fahrenheit to about 206 degrees Fahrenheit, such that during an unplanned thermal stimulus the plastic member softens or melts so as to no longer firmly secure and support said fuze within said projectile body, whereby if combustion gases are generated by an auto-ignition of said explosive, such gases can vent around said fuze plug or cause said fuze to detach or be expelled to likewise vent such gases; said allowance for venting of such gases preventing a more seriously potent explosion of the projectile body were it a fully sealed device if completely closed by the fuze without possibility of venting of gases; wherein the explosive loaded projectiles are stored in an accompanying box, said box fully coated externally and internally with an intumescent paint, said intumescent paint slowing the advance of a fire external to said box, such that the temperature of the projectiles in the box advances at a slower rate of heating to more assuredly allow heat to be adequately absorbed in each projectile plastic member sufficient to soften such members prior to the time that the explosive of a projectile can reach its auto-ignition temperature thus more assuredly allowing for the possibility of venting of combustion gases at such time when the explosive might reach its auto-ignition temperature. 2. The system of claim 1, wherein the plastic member has a diameter of approximately 1.5 inches. 3. The system of claim 2, wherein the plastic member has a length of approximately 0.64 inch. 4. The system of claim 1, wherein the projectile body is made of a steel shell having an ogival shape. 5. The system of claim claim 1, further including an obturating ring secured to the body. 6. The system according to claim 5, further including a tail fin. 7. The system of claim 6, wherein the body is secured to the tail fin via a threaded portion. 8. The system of claim 7, wherein the tail fin comprises a plurality of fins that maintain a flight path of the projectile. 9. The system of claim 8, wherein the tail section further comprises an ignition cartridge. 10. The system of claim 9, wherein the tail fin further comprises a plurality of vent holes. 11. The system of claim 10, wherein the tail section further comprises a plurality of propelling charge containers for holding a propelling charge; and wherein upon firing of the projectile, the ignition cartridge is impacted to cause the propelling charge to combust inside the tail fin, which, in turn, causes the propelling charge outside the tail fin to combust and to generate a combustible gas and pressure to propel the projectile forward in flight. 12. A system of explosive loaded projectiles protected from chain explosion caused by possibility of fire, with reduced probability of accidental detonation of the projectiles when subjected to an unplanned thermal stimulus, comprising projectiles that have: a. projectile body having a forward end, an aft region, and an inner surface, said forward end having a cylindrical opening for placement of a fuze, said opening having internal threads disposed therein, said projectile body having COMP B explosive disposed within the inner surface thereof; said fuze comprising a plug end, said plug end having external threads thereon; an annular cylindrically shaped ionomer plastic member, said plastic member having external threads which are sized so as to mate with said internal threads of said projectile body cylindrical opening, and said plastic member having internal threads to match the fuze plug external threads, said plastic member being disposed wholly internal to said fuze body cylindrical opening annuarly surrounding said plug region of said fuze, so as to secure said fuze to said projectile body and support the fuze therein, wherein said plastic member softens at a temperature substantially below the auto-ignition temperature of said explosive and by a factor of at least 40% below such auto-ignition temperature, said plastic member softening at a temperature of 200 degrees Fahrenheit to about 206 degrees Fahrenheit, such that during an unplanned thermal stimulus the plastic member softens or melts so as to no longer firmly secure and support said fuze within said projectile body, whereby if combustion gases are generated by an auto-ignition of said explosive, such gases can vent around said fuze plug or cause said fuze to detach or be expelled to likewise vent such gases; said allowance for venting of such gases preventing a more seriously potent explosion of the projectile body were it a fully sealed device if completely closed by the fuze without possibility of venting of gases.
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