Initiator with an internal sleeve retaining a pyrotechnic charge and methods of making same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F42B-00310
F42C-01912
출원번호
US-0188003
(2002-07-01)
발명자
/ 주소
Avetisian, Vahan
Bonas, Andrew
Rosin, Todd
Kajita, Eishi
출원인 / 주소
Special Devices, Inc.
대리인 / 주소
Law Offices of Thomas J. Brindisi
인용정보
피인용 횟수 :
3인용 특허 :
9
초록▼
A pyrotechnic initiator having an internal sleeve that facilitates the loading and durable retention of a pyrotechnic charge in place on the header surface within the initiator. The sleeve beneficially retains the charge either in conjunction with the upper interior surface of the charge can, or thr
A pyrotechnic initiator having an internal sleeve that facilitates the loading and durable retention of a pyrotechnic charge in place on the header surface within the initiator. The sleeve beneficially retains the charge either in conjunction with the upper interior surface of the charge can, or through the use of a monolithic charge and a narrowed top end of the sleeve.
대표청구항▼
1. An initiator comprising:a) a header assembly including an eyelet, a top surface, and an exposed electrical initiating element on said top surface; b) a charge sleeve projecting upwardly above said top surface of said eyelet and having a narrowed top end with an inner diameter; c) a charge within
1. An initiator comprising:a) a header assembly including an eyelet, a top surface, and an exposed electrical initiating element on said top surface; b) a charge sleeve projecting upwardly above said top surface of said eyelet and having a narrowed top end with an inner diameter; c) a charge within said charge sleeve, said charge being a monolithic solid mass and having a largest outer diameter that is greater than said inner diameter of said narrowed top end of said charge sleeve, said charge being in firm contact with said charge sleeve and said exposed electrical initiating element; and, d) a charge can attached to said header assembly and surrounding said charge sleeve and charge, said charge can being hermetic so as to separate said charge from the ambient environment exterior to said charge can. 2. The initiator subassembly of claim 1, wherein said electrical initiating element is a bridgewire.3. The initiator of claim 2, wherein said charge is formed from a slurry that includes a binder at less than one percent by weight and a solvent at between ten to thirty percent by weight.4. The initiator of claim 3, wherein said charge has a top surface that is concave.5. The initiator of claim 1, wherein said charge sleeve is generally cup-shaped and includes a generally flat bottom having a hole located in the region of said electrical initiating element, said hole having a circumferential rim formed to create a primer charge dam, said primer charge dam being loaded with a primer charge.6. The initiator of claim 1, wherein said charge can has an interior upper surface, said interior upper surface being in intimate contact with said charge.7. The initiator of claim 1, wherein said eyelet further comprises a circumferential recess, the bottom of said charge sleeve being sawaged into said circumferential recess.8. The initiator of claim 1, wherein said charge can and said charge sleeve are both circumferentially welded to said eyelet.9. A method for making an initiator, comprising the steps of:a) providing a header assembly including an eyelet, a top surface, and an exposed electrical initiating element on said top surface; b) providing a charge sleeve projecting upwardly above said top surface of said eyelet; c) loading a charge in the form of a liquid or slurry within said charge sleeve; d) drying said liquid or slurry charge; and, e) attaching a charge can to said header assembly so as to surround said charge sleeve and said charge and hermetically separate said charge from the ambient environment exterior to said charge can. 10. The method of claim 9, further comprising the step of providing a narrowed top end on said sleeve.11. The method of claim 9, wherein said charge sleeve is generally cup-shaped and includes a hole in its bottom, said method further comprising the step of attaching the bottom of said charge sleeve to the top surface of said header assembly.12. The method of claim 9, wherein said eyelet has an outer diameter and said charge sleeve has a lower region having an inner diameter that is approximately the same as said outer diameter of said eyelet, said method further comprising the step of sliding said charge can down over said charge sleeve after said charge sleeve is loaded with said charge, said step of sliding continuing at least until the upper interior surface of said charge can is in intimate contact with said charge.13. The method of claim 12, wherein said step of sliding continues until said charge is consolidated under a pressure of at least 1000 psi.14. The method of claim 9, wherein step f) is performed before or after step c).15. A method for making an initiator, comprising the steps of:a) poviding a header assembly including an eyelet having an outer diameter, a top surface, and an exposed electrical initiating element on said top surface; b) providing a charge sleeve that has a lower region having an inner diameter approximately the same as said outer diameter of said eyelet, said charge sleeve projecting upwardly above said top surface of said eyelet; c) loading a charge within said charge sleeve in the form of a liquid or slurry and forming one or more protruding portions at the top of said charge; d) after step c), sliding a charge can having an upper interior surface down over said charge a sleeve at least until the upper interior surface of said charge can is in intimate contact with said charge, and flattening said one or more protruding portions against the upper interior surface of said charge can; e) attaching said charge can to said header assembly so as to surround said charge sleeve and said charge and hermetically separate said charge from the ambient environment exterior to said charge can. 16. The method of claim 15, wherein said eyelet includes a circumferential shoulder, and said step of sliding includes sliding said charge can downwardly so as to cause said charge sleeve to slide downwardly until it abuts said shoulder.17. The method of claim 15, wherein said step of sliding continues until said charge in consolidated under a pressure of at least 1000 psi.18. The method of claim 15, wherein said charge sleeve includes a readily deformable crumple zone, and said step of sliding continues until said charge sleeve deforms along said crumple zone.19. The method of claim 15, wherein said charge sleeve has an open top end that is substantially straight.20. The method of claim 15, wherein said eyelet further comprises a circumferential shoulder formed to abut the bottom of said charge sleeve.21. The method of claim 20, further comprising of circumferentially welding said charge ran and the steps said charge sleeve to said eyelet.22. The initiator made by the method of claim 9.23. The initiator made by the method of claim 15.
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