IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0441755
(1982-11-15)
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발명자
/ 주소 |
- Rucker Klaus G. (Kinnelon NJ)
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출원인 / 주소 |
- E. I. Du Pont de Nemours and Company (Wilmington DE 02)
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인용정보 |
피인용 횟수 :
23 인용 특허 :
0 |
초록
▼
An RF-filter for an electric blasting cap comprises, in sequence from the cap\s bridgewire, a first series-wired inductance plug (e.g., one or more ferrite beads), a shunt-wired resistance slug (e.g., conductive silicone rubber), two series-wired resistors (e.g., 27 ohm) in parallel geometry, and a
An RF-filter for an electric blasting cap comprises, in sequence from the cap\s bridgewire, a first series-wired inductance plug (e.g., one or more ferrite beads), a shunt-wired resistance slug (e.g., conductive silicone rubber), two series-wired resistors (e.g., 27 ohm) in parallel geometry, and a second series-wired inductance plug adjacent the sealing plug on the cap. The filter elements are sheathed in a heat-resistant insulating and supporting sleeve, and an electrostatic flashover point is provided between the sealing plug and the inductance plug. The filter affords RF protection of 25 db between 1 and 4000 MHz, and withstands high current or voltage surges over a wide temperature range without permanent impairment.
대표청구항
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In an electric initiator having a metal shell integrally closed at one end and closed at its opposite end by a sealing plug, and containing an ignition composition and an electrical ignition assembly including, in sequence from said ignition composition, an inductance plug of a magnetic inductance c
In an electric initiator having a metal shell integrally closed at one end and closed at its opposite end by a sealing plug, and containing an ignition composition and an electrical ignition assembly including, in sequence from said ignition composition, an inductance plug of a magnetic inductance composition and a resistance slug adjacent thereto, said inductance plug being slidably threaded, and said resistance slug being adherently threaded, on a first pair of separate electrical conductors, said pair of conductors being parallel to the longitudinal axis of said metal shell, in electrical contact with said resistance slug, and joined at a first one of their ends by a bridgewire contacting said ignition composition, the improvement comprising (a) an entrance inductance plug of a magnetic inductance composition adjacent said sealing plug; and (b) a pair of separate resistors between, and adjacent, said entrance inductance plug and said resistance slug, each of said resistors having (1), seated in the end thereof adjacent said resistance slug, the second end of one of said first pair of electrical conductors and (2), seated in the end thereof adjacent said entrance inductance plug, a first end of one of a second pair of separate electrical conductors, said second pair of conductors being parallel to the longitudinal axis of said metal shell, having said entrance inductance plug slidably threaded thereon, and each having a second end joined to a leg wire.
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