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US3750581A - Missile motor igniter assembly - Google Patents

Missile motor igniter assembly Download PDF

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Publication number
US3750581A
US3750581A US00181784A US3750581DA US3750581A US 3750581 A US3750581 A US 3750581A US 00181784 A US00181784 A US 00181784A US 3750581D A US3750581D A US 3750581DA US 3750581 A US3750581 A US 3750581A
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US
United States
Prior art keywords
cartridge case
cap
holder
percussion primer
motor
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
Application number
US00181784A
Inventor
R Betts
N Williams
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United States Department of the Army
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United States Department of the Army
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Publication date
Application filed by United States Department of the Army filed Critical United States Department of the Army
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Publication of US3750581A publication Critical patent/US3750581A/en
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    • 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
    • F42C19/0823—Primers or igniters for the initiation or the propellant charge in a cartridged ammunition
    • F42C19/0826—Primers or igniters for the initiation or the propellant charge in a cartridged ammunition comprising an elongated perforated tube, i.e. flame tube, for the transmission of the initial energy to the propellant charge, e.g. used for artillery shells and kinetic energy penetrators
    • 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
    • F42C19/0819—Primers or igniters for the initiation of rocket motors, i.e. pyrotechnical aspects thereof

Definitions

  • 39-82 E is used to transfer ignition from the primer to the igniter charge.
  • the end of the detonating cord adjacent References Cited the cartridge case is retained in position by a holder UNITED STATES PATENTS mounted in the cartridge case. 3,103,884 9/1963 Ciccone et al. 102/27 R 2 Claims, 2 Drawing Fi PATENTED M13 7 FIG. I
  • MISSILE MOTOR IGNITER ASSEMBLY BACKGROUND OF THE INVENTION This invention relates to the field of missile motor igniters.
  • Existing missile motor igniter assemblies are rather detailed in design and hence very costly. These igniters require extensive screw machining of the cap end of igniter and other machine operations to fit a detonating cord in the igniter which causes a high cost.
  • the present invention has utilized a cartridge case provided with a percussion primer at the cap end of the igniter assembly to actuate the igniter charge.
  • the use of this cartridge case in conjunction with a percussion primer has resulted in a much cheaper cap for missile motor igniters.
  • FIG. I is a diagrammative view showing the igniter assembly mounted in position on a missile.
  • FIG. 2 is a enlarged sectional view of the igniter assembly removed from the missile motor.
  • the assembly includes a tube 3 attached to a cap 5 which is provided with means 7 thereon for mounting the assembly on the missile motor.
  • An igniter charge 9 is located in the tube which is vented by several openings 11 for allowing the igniter charge gases to escape thus enhancing the burning rate of the charge.
  • the cap is provided with a central opening 13 and a cartridge case 15 is located in this opening.
  • the cartridge case includes a portion 17 to provide a support for mounting a PLEXIGLAS holder 19 thereon. This holder is fitted snug in the cartridge case and is sealed thereto by a sealing means 20 such as epoxy.
  • a sealing means 22 By sealing the holder to the cartridge case protection is provided against external environmental effects on the igniter charge and against deterioration of the end of the detonating cord.
  • One end of the cord is disposed adjacent a percussion primer 23 located in the end of the cartridge case.
  • This stand-off distance is in the range of 20 thousands of an inch to one-fourth of an inch.
  • the opposite end of the cord extends into the igniter charge 9 for transferring the ignition from the primer to the igniter charge.
  • a member 25, provided with a firing pin opening 27, is located in an enlarged section of opening 13 and is provided with means 29 for engaging cap 3 to retain the cartridge case in the cap.
  • a firing pin (not shown) strikes the percussion primer and causes it to fire and ignite the detonating cord.
  • the ignited cord then burns until it ignites the igniter charge which in turn ignites a propellant 51 of the missile motor.
  • An assembly for igniting a missile motor comprising: a cartridge case provided with a percussion primer; a PLEXIGLAS holder mounted in said case in spaced relationship to said percussion primer cartridge, and a detonating cord secured to said holder with one of its ends at a predetermined distance from said percussion primer to enhance ignition of said cord and its opposite end extending away from said holder and into the motor igniter charge.
  • An assembly for igniting a missile motor comprising: a cap provided with means for mounting said assembly in said missile motor; a cartridge case supported in said cap and provided with a percussion primer; said cap having a member for retaining the cartridge case in said cap, said member having an opening juxtaposition said percussion primer; a tube connected to said cap and provided with an igniter charge; said tube having a plurality of openings to enhance the burning rate of the igniter charge; a PLEXIGLAS holder mounted in said cartridge case in spaced relationship to said percussion primer, and a detonating cord secured to said holder with one of its ends at a predetermined distance from said percussion primer to enhance ignition of said cord and its opposite end extending away from said holder and into the motor igniter charge.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Abstract

An assembly for igniting a missile motor from a percussion primer carried in a cartridge case to an igniter charge located in the missle motor. A detonating cord, having one of its ends positioned in the cartridge case, is used to transfer ignition from the primer to the igniter charge. The end of the detonating cord adjacent the cartridge case is retained in position by a holder mounted in the cartridge case.

Description

United States Patent 1 i 3,750,581 Betts et al. Aug. 7, 1973 [54] MISSILE MOTOR IGNITER ASSEMBLY 3,446,022 5/1969 Olliff, Jr. et al. 60/256 [75] Inventors: Robert E. Betts; Nathan P. Williams, 1 3:51;: 222 both of Humsvllle, 2,39l,865 H1946 Chandler 60/256 [73] Assignee: The United States of America as represented b th secretary of h Primary Examiner-Benjamin A. Borchelt Army, W hi C Assistant Examiner-G. E. Monto ne Attorney-- Harry M. Saragovitz, Edward J. [22] Filed: Sept. 20, 1971 Kelly et al [2] I App]; No.: 181,784 7 ABSTRACT An assembly for igniting a missile motor from a percus- [52] US. Cl 102/49-7, 60/256, 102/27 ign primer carried in a cartridge case to an ignite! [51] Int. Cl. F42b 15/00, FOZk 9/04 h r lo ated in the missle motor. A detonating cord, [58] Field of Search l02/49.7, 27 R; h i n of it ends positioned in the cartridge case,
39-82 E is used to transfer ignition from the primer to the igniter charge. The end of the detonating cord adjacent References Cited the cartridge case is retained in position by a holder UNITED STATES PATENTS mounted in the cartridge case. 3,103,884 9/1963 Ciccone et al. 102/27 R 2 Claims, 2 Drawing Fi PATENTED M13 7 FIG. I
Robert E Befls Nathan P. Williams, INVENTORY;
MISSILE MOTOR IGNITER ASSEMBLY BACKGROUND OF THE INVENTION This invention relates to the field of missile motor igniters. Existing missile motor igniter assemblies are rather detailed in design and hence very costly. These igniters require extensive screw machining of the cap end of igniter and other machine operations to fit a detonating cord in the igniter which causes a high cost.
SUMMARY OF THE INVENTION The present invention has utilized a cartridge case provided with a percussion primer at the cap end of the igniter assembly to actuate the igniter charge. The use of this cartridge case in conjunction with a percussion primer has resulted in a much cheaper cap for missile motor igniters.
The invention may be better understood from the following detailed description taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a diagrammative view showing the igniter assembly mounted in position on a missile.
FIG. 2 is a enlarged sectional view of the igniter assembly removed from the missile motor.
DESCRIPTION OF THE PREFERRED EMBODIMENT Reference numeral generally indicates an igniter assembly for igniting a motor of a missile 50. The assembly includes a tube 3 attached to a cap 5 which is provided with means 7 thereon for mounting the assembly on the missile motor. An igniter charge 9 is located in the tube which is vented by several openings 11 for allowing the igniter charge gases to escape thus enhancing the burning rate of the charge. The cap is provided with a central opening 13 and a cartridge case 15 is located in this opening. The cartridge case includes a portion 17 to provide a support for mounting a PLEXIGLAS holder 19 thereon. This holder is fitted snug in the cartridge case and is sealed thereto by a sealing means 20 such as epoxy. A detonating cord 21, such as pyrocore or a mild detonating fuse, is fixedly mounted in the holder by a sealing means 22. By sealing the holder to the cartridge case protection is provided against external environmental effects on the igniter charge and against deterioration of the end of the detonating cord. One end of the cord is disposed adjacent a percussion primer 23 located in the end of the cartridge case. Experimentation has determined that the proper stand-off distance of the detonating cord from the percussion primer will insure reliable ignition of the detonating cord. This stand-off distance is in the range of 20 thousands of an inch to one-fourth of an inch. The opposite end of the cord extends into the igniter charge 9 for transferring the ignition from the primer to the igniter charge. A member 25, provided with a firing pin opening 27, is located in an enlarged section of opening 13 and is provided with means 29 for engaging cap 3 to retain the cartridge case in the cap.
In operation a firing pin (not shown) strikes the percussion primer and causes it to fire and ignite the detonating cord. The ignited cord then burns until it ignites the igniter charge which in turn ignites a propellant 51 of the missile motor.
We claim:
I. An assembly for igniting a missile motor comprising: a cartridge case provided with a percussion primer; a PLEXIGLAS holder mounted in said case in spaced relationship to said percussion primer cartridge, and a detonating cord secured to said holder with one of its ends at a predetermined distance from said percussion primer to enhance ignition of said cord and its opposite end extending away from said holder and into the motor igniter charge.
2. An assembly for igniting a missile motor comprising: a cap provided with means for mounting said assembly in said missile motor; a cartridge case supported in said cap and provided with a percussion primer; said cap having a member for retaining the cartridge case in said cap, said member having an opening juxtaposition said percussion primer; a tube connected to said cap and provided with an igniter charge; said tube having a plurality of openings to enhance the burning rate of the igniter charge; a PLEXIGLAS holder mounted in said cartridge case in spaced relationship to said percussion primer, and a detonating cord secured to said holder with one of its ends at a predetermined distance from said percussion primer to enhance ignition of said cord and its opposite end extending away from said holder and into the motor igniter charge.

Claims (2)

1. An assembly for igniting a missile motor comprising: a cartridge case provided with a percussion primer; a PLEXIGLAS holder mounted in said case in spaced relationship to said percussion primer cartridge, and a detonating cord secured to said holder with one of its ends at a predetermined distance from said percussion primer to enhance ignition of said cord and its opposite end extending away from said holder and into the motor igniter charge.
2. An assembly for igniting a missile motor comprising: a cap provided with means for mounting said assembly in said missile motor; a cartridge case supported in said cap and provided with a percussion primer; said cap having a member for retaining the cartridge case in said cap, said member having an opening juxtaposition said percussion primer; a tube connected to said cap and provided with an igniter charge; said tube having a plurality of openings to enhance the burning rate of the igniter charge; a PLEXIGLAS holder mounted in said cartridge case in spaced relationship to said percussion primer, and a detonating cord secured to said holder with one of its ends at a predetermined distance from said percussion primer to enhance ignition of said cord and its opposite end extending away from said holder and into the motor igniter charge.
US00181784A 1971-09-20 1971-09-20 Missile motor igniter assembly Expired - Lifetime US3750581A (en)

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US18178471A 1971-09-20 1971-09-20

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325900A1 (en) * 1975-09-27 1977-04-22 Rheinmetall Gmbh PRIMING CHAIN
US4068591A (en) * 1976-03-10 1978-01-17 The United States Of America As Represented By The Secretary Of The Army Ignition system used in testing solid propellant compositions for smokelessness
EP0204623A1 (en) * 1985-06-06 1986-12-10 Societe Nationale Des Poudres Et Explosifs Igniter for an additional charge in a shell
FR2591735A1 (en) * 1985-12-17 1987-06-19 Thomson Brandt Armements Pyrotechnic gas generator and use in a device for ejecting sub-munitions from a warhead
US6474239B2 (en) * 1999-12-08 2002-11-05 Giat Industries Igniter tube for artillery ammunition
US6857370B1 (en) * 2002-04-10 2005-02-22 General Dynamics Ordnance And Tactical Systems, Inc. Primer body
RU2476712C1 (en) * 2011-08-12 2013-02-27 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" Method to start pyrotechnical devices and device for its realisation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2391865A (en) * 1942-02-14 1946-01-01 Edward F Chandler Self-propelled projectile
US3062147A (en) * 1959-09-28 1962-11-06 Du Pont Igniter for solid propellant grains
US3103884A (en) * 1962-03-16 1963-09-17 Thomas Q Ciccone Cartridge for more nearly uniform projectile velocities
US3388666A (en) * 1966-03-22 1968-06-18 Karlsruhe Augsburg Iweka Rifle grenade
US3446022A (en) * 1967-02-06 1969-05-27 Thiokol Chemical Corp Integral motor case and nozzle for solid propellant rocket motors

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2391865A (en) * 1942-02-14 1946-01-01 Edward F Chandler Self-propelled projectile
US3062147A (en) * 1959-09-28 1962-11-06 Du Pont Igniter for solid propellant grains
US3103884A (en) * 1962-03-16 1963-09-17 Thomas Q Ciccone Cartridge for more nearly uniform projectile velocities
US3388666A (en) * 1966-03-22 1968-06-18 Karlsruhe Augsburg Iweka Rifle grenade
US3446022A (en) * 1967-02-06 1969-05-27 Thiokol Chemical Corp Integral motor case and nozzle for solid propellant rocket motors

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325900A1 (en) * 1975-09-27 1977-04-22 Rheinmetall Gmbh PRIMING CHAIN
US4068591A (en) * 1976-03-10 1978-01-17 The United States Of America As Represented By The Secretary Of The Army Ignition system used in testing solid propellant compositions for smokelessness
EP0204623A1 (en) * 1985-06-06 1986-12-10 Societe Nationale Des Poudres Et Explosifs Igniter for an additional charge in a shell
FR2583157A1 (en) * 1985-06-06 1986-12-12 Poudres & Explosifs Ste Nale IGNITER FOR GAS GENERATOR CHARGERS OF OBUS
US4691633A (en) * 1985-06-06 1987-09-08 Societe Nationale Des Poudres Et Explosifs Igniter intended for gas-generating charges in shells
FR2591735A1 (en) * 1985-12-17 1987-06-19 Thomson Brandt Armements Pyrotechnic gas generator and use in a device for ejecting sub-munitions from a warhead
US6474239B2 (en) * 1999-12-08 2002-11-05 Giat Industries Igniter tube for artillery ammunition
US6857370B1 (en) * 2002-04-10 2005-02-22 General Dynamics Ordnance And Tactical Systems, Inc. Primer body
RU2476712C1 (en) * 2011-08-12 2013-02-27 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" Method to start pyrotechnical devices and device for its realisation

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