US3788227A - Jet ignition device for a pyrotechnic fuze - Google Patents
Jet ignition device for a pyrotechnic fuze Download PDFInfo
- Publication number
- US3788227A US3788227A US00321435A US3788227DA US3788227A US 3788227 A US3788227 A US 3788227A US 00321435 A US00321435 A US 00321435A US 3788227D A US3788227D A US 3788227DA US 3788227 A US3788227 A US 3788227A
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- US
- United States
- Prior art keywords
- nozzle
- closing
- primer
- ignition
- ignition device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/0807—Primers; Detonators characterised by the particular configuration of the transmission channels from the priming energy source to the charge to be ignited, e.g. multiple channels, nozzles, diaphragms or filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/0815—Intermediate ignition capsules, i.e. self-contained primary pyrotechnic module transmitting the initial firing signal to the secondary explosive, e.g. using electric, radio frequency, optical or percussion signals to the secondary explosive
Definitions
- Cited UNITED STATES PATENTS 8/1949 Carr 60/256 Primary Examiner-Verlin R. Pendegrass Attorney, Agent, or Firm-R. S. Sciascia; Paul S.
- ABSTRACT An ignition device having an open-ended case with a primer closing one end and a nozzle closing the opposite end. An orifice is provided in the nozzle and the orifice is closed by a frangible disk attached to the outer end of said nozzle. An ignition pellet is contained in said case adjacent said nozzle and detonation of said primer ruptures said frangible disk and ignites said ignition pellet.
- the present invention relates to a jet ignition system and more particularly to an ignition system for a pyrotechnic item, such as an aircraft parachute flare.
- a primer is positioned in one end of a holder and an ejection plunger is positioned in the opposite end.
- the ejection plunger contains a quantity of black powder and has a pointed forward end and has a passageway so that heat and flame from a burning of the black powder can pass into the forward end and exit'through a plurality of holes in the pointed end.
- Detonation of the primer drives the ejection plunger into a delay fuze and simultaneously ignites a fixed delay which subsequently ignites the black powder.
- the device shown and described in the abovereferenced patent application has several disadvantages.
- the pointed ejection plunger was required to hit the center of the delay fuze in order to insure reliable ignition and thus accurate positioning of the ignition device was necessary.
- the pyrotechnic delay elements and the black powder was very susceptible to moisture intrusion which caused excessive delay times and duds.
- a cylindrical case is provided and has a center bore therethrough.
- a primer closes the aft end of the case and a nozzle closes the forward end of the case.
- nozzle is provided with an orifice whose length is partly a pyrotechnic fuze.
- FIG. 1 is an end view of a preferred embodiment of the present invention.
- FIG. 2 is a sectional view taken on line 2--2 of FIG. 1.
- case 11 having a central bore 12 therethrough, and a primer l3 closes the aft end of case 11.
- a nozzle 14 is attached to the forward end of case 11 by crimping.
- nozzle 14 is provided with an orifice 15 that has a flared portion 16 and an ignition pellet 17 is contained in bore 12 adjacent nozzle 14.
- a frangible disk 18 is attached, as by cementing, to the front face of nozzle 14 thereby closing bore 12 to prevent any moisture from entering and affecting ignition pellet 17.
- case 11 might be aluminum
- nozzle 14 might be brass and disk 18 might be plastic, such as polyester film.
- Ignition pellet 17 might be comprised of powdered magnesium and tef- Ion.
- a firing pin detonates primer l3 and the pressure and flame from primer 13 ruptures frangible disk 18.
- the flame from primer 13 also ignites ignition pellet 17, and the hot gases and flame generated by the burning of ignition pellet 17 are directed outwardly through orifice 15 of nozzle 14 and are used to ignite a pyrotechnic delay element.
- An ignition device for a pyrotechnic fuze comprising,
- a nozzle crimped to the other end and closing said central bore, said nozzle having a circular orifice in the forward end thereof and an outwardly extending flared portion in the aft end thereof,
- a frangible disk attached to the outer end of said nozzle and closing said circular orifice of said nozzle.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
Abstract
An ignition device having an open-ended case with a primer closing one end and a nozzle closing the opposite end. An orifice is provided in the nozzle and the orifice is closed by a frangible disk attached to the outer end of said nozzle. An ignition pellet is contained in said case adjacent said nozzle and detonation of said primer ruptures said frangible disk and ignites said ignition pellet.
Description
United States Patent 1191 Clifton et al.
JET IGNITION DEVICE FOR A PYROTECHNIC FUZE Inventors: John R. Clifton; Gary S. Edwards,
both of Bedford, Ind.
The United States of America as represented by the Secretary of the Navy, Washington, DC.
Filed: Jan. 5, 1973 Appl. No.: 321,435
Assignee:
US. Cl. 102/70 R, 102/49.7 Int. Cl. F42c 19/08 Field of Search 102/49.7, 70, 70.2, 86.5;
References Cited UNITED STATES PATENTS 8/1949 Carr 60/256 Primary Examiner-Verlin R. Pendegrass Attorney, Agent, or Firm-R. S. Sciascia; Paul S.
Collignon [5 7] ABSTRACT An ignition device having an open-ended case with a primer closing one end and a nozzle closing the opposite end. An orifice is provided in the nozzle and the orifice is closed by a frangible disk attached to the outer end of said nozzle. An ignition pellet is contained in said case adjacent said nozzle and detonation of said primer ruptures said frangible disk and ignites said ignition pellet.
1 Claim, 2. Drawing Figures JET IGNITION DEVICE FOR A PYROTECI'INIC FUZE CROSS-REFERENCE TO RELATED APPLICATION BACKGROUND OF THE INVENTION The present invention relates to a jet ignition system and more particularly to an ignition system for a pyrotechnic item, such as an aircraft parachute flare.
In the above-referenced patent application, there is shown a device for igniting a delay fuze in an aircraft parachute flare. A primer is positioned in one end of a holder and an ejection plunger is positioned in the opposite end. The ejection plunger contains a quantity of black powder and has a pointed forward end and has a passageway so that heat and flame from a burning of the black powder can pass into the forward end and exit'through a plurality of holes in the pointed end. Detonation of the primer drives the ejection plunger into a delay fuze and simultaneously ignites a fixed delay which subsequently ignites the black powder.
The device shown and described in the abovereferenced patent application has several disadvantages. The pointed ejection plunger was required to hit the center of the delay fuze in order to insure reliable ignition and thus accurate positioning of the ignition device was necessary. Also the pyrotechnic delay elements and the black powder was very susceptible to moisture intrusion which caused excessive delay times and duds.
SUMMARY OF THE INVENTION A cylindrical case is provided and has a center bore therethrough. A primer closes the aft end of the case and a nozzle closes the forward end of the case. The
nozzle is provided with an orifice whose length is partly a pyrotechnic fuze.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is an end view of a preferred embodiment of the present invention; and
FIG. 2 is a sectional view taken on line 2--2 of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing, there is shown a case 11 having a central bore 12 therethrough, and a primer l3 closes the aft end of case 11. A nozzle 14 is attached to the forward end of case 11 by crimping. As best shown in FIG. 2 of the drawing, nozzle 14 is provided with an orifice 15 that has a flared portion 16 and an ignition pellet 17 is contained in bore 12 adjacent nozzle 14. A frangible disk 18 is attached, as by cementing, to the front face of nozzle 14 thereby closing bore 12 to prevent any moisture from entering and affecting ignition pellet 17. By way of example, case 11 might be aluminum, nozzle 14 might be brass and disk 18 might be plastic, such as polyester film. Ignition pellet 17 might be comprised of powdered magnesium and tef- Ion.
OPERATION In operation, a firing pin detonates primer l3 and the pressure and flame from primer 13 ruptures frangible disk 18. The flame from primer 13 also ignites ignition pellet 17, and the hot gases and flame generated by the burning of ignition pellet 17 are directed outwardly through orifice 15 of nozzle 14 and are used to ignite a pyrotechnic delay element.
We claim:
1. An ignition device for a pyrotechnic fuze comprising,
a case having a central bore therethrough,
a primer closing one end of said central bore,
a nozzle crimped to the other end and closing said central bore, said nozzle having a circular orifice in the forward end thereof and an outwardly extending flared portion in the aft end thereof,
an ignition pellet positioned in said central bore adjacent said flared portion of said nozzle, and
a frangible disk attached to the outer end of said nozzle and closing said circular orifice of said nozzle.
Claims (1)
1. An ignition device for a pyrotechnic fuze comprising, a case having a central bore therethrough, a primer closing one end of said central bore, a nozzle crimped to the other end and closing said central bore, said nozzle having a circular orifice in the forward end thereof and an outwardly extending flared portion in the aft end thereof, an ignition pellet positioned in said central bore adjacent said flared portion of said nozzle, and a frangible disk attached to the outer end of said nozzle and closing said circular orifice of said nozzle.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US32143573A | 1973-01-05 | 1973-01-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3788227A true US3788227A (en) | 1974-01-29 |
Family
ID=23250594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00321435A Expired - Lifetime US3788227A (en) | 1973-01-05 | 1973-01-05 | Jet ignition device for a pyrotechnic fuze |
Country Status (1)
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US (1) | US3788227A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4378739A (en) * | 1981-03-23 | 1983-04-05 | The United States Of America As Represented By The Secretary Of The Navy | Primer firing means |
EP0263800A2 (en) * | 1986-04-30 | 1988-04-13 | BePAB, Bergslagens Produktutveckling AB | Detonator for a non-electric detonation system for blasting charges |
US5345871A (en) * | 1989-04-13 | 1994-09-13 | Buck Werke Gmbh & Co. | Igniter-destructor device |
US20190249970A1 (en) * | 2018-02-15 | 2019-08-15 | Goodrich Corporation | High explosive firing mechanism |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2479470A (en) * | 1944-03-13 | 1949-08-16 | Union Oil Co | Asphaltic jet propulsion fuel |
US2681619A (en) * | 1954-06-22 | Rocket projectile | ||
US3210931A (en) * | 1962-02-16 | 1965-10-12 | Atlantic Res Corp | Gas generator |
US3392673A (en) * | 1967-05-29 | 1968-07-16 | Navy Usa | Consumable pyrogen igniter |
US3392672A (en) * | 1967-05-29 | 1968-07-16 | Navy Usa | Flare lighter |
-
1973
- 1973-01-05 US US00321435A patent/US3788227A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2681619A (en) * | 1954-06-22 | Rocket projectile | ||
US2479470A (en) * | 1944-03-13 | 1949-08-16 | Union Oil Co | Asphaltic jet propulsion fuel |
US3210931A (en) * | 1962-02-16 | 1965-10-12 | Atlantic Res Corp | Gas generator |
US3392673A (en) * | 1967-05-29 | 1968-07-16 | Navy Usa | Consumable pyrogen igniter |
US3392672A (en) * | 1967-05-29 | 1968-07-16 | Navy Usa | Flare lighter |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4378739A (en) * | 1981-03-23 | 1983-04-05 | The United States Of America As Represented By The Secretary Of The Navy | Primer firing means |
EP0263800A2 (en) * | 1986-04-30 | 1988-04-13 | BePAB, Bergslagens Produktutveckling AB | Detonator for a non-electric detonation system for blasting charges |
EP0263800A3 (en) * | 1986-04-30 | 1988-08-10 | Nobel Kemi Ab | Detonator for a non-electric detonation system for blasting charges |
US5345871A (en) * | 1989-04-13 | 1994-09-13 | Buck Werke Gmbh & Co. | Igniter-destructor device |
US20190249970A1 (en) * | 2018-02-15 | 2019-08-15 | Goodrich Corporation | High explosive firing mechanism |
US10837747B2 (en) * | 2018-02-15 | 2020-11-17 | Goodrich Corporation | High explosive firing mechanism |
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