EP0530241A1 - Anneau etanche pour projectile amorce pyrotechniquement. - Google Patents

Anneau etanche pour projectile amorce pyrotechniquement.

Info

Publication number
EP0530241A1
EP0530241A1 EP91909413A EP91909413A EP0530241A1 EP 0530241 A1 EP0530241 A1 EP 0530241A1 EP 91909413 A EP91909413 A EP 91909413A EP 91909413 A EP91909413 A EP 91909413A EP 0530241 A1 EP0530241 A1 EP 0530241A1
Authority
EP
European Patent Office
Prior art keywords
jacket
projectile
seal
penetrator
incendiary
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.)
Granted
Application number
EP91909413A
Other languages
German (de)
English (en)
Other versions
EP0530241B1 (fr
EP0530241A4 (en
Inventor
David K Schluckebier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olin Corp
Original Assignee
Olin Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US07/537,190 external-priority patent/US5133259A/en
Application filed by Olin Corp filed Critical Olin Corp
Publication of EP0530241A1 publication Critical patent/EP0530241A1/fr
Publication of EP0530241A4 publication Critical patent/EP0530241A4/en
Application granted granted Critical
Publication of EP0530241B1 publication Critical patent/EP0530241B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/20—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type
    • F42B12/201—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type characterised by target class
    • F42B12/204—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type characterised by target class for attacking structures, e.g. specific buildings or fortifications, ships or vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
    • F42B12/44—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information of incendiary type

Definitions

  • This invention generally relates to projectiles having explosive charges therein and more particularly to a pyrotechnically initiatied explosive (PIE) projectile which is ignited by a pyrotechnic incendiary charge located in the nose of the projectile. More specifically, the invention relates to a barrier which prevents preignition of the pyrotechnic charge from relative frictional movement between the projectile components.
  • PIE pyrotechnically initiatied explosive
  • US Patent No. 47,544 to Hotchkiss discloses an explosive ordnance shell having transverse ribs to partition the explosive charge so as to limit friction between the shell contents during spin up.
  • US Patent No. 373,459 to Howell also discloses an explosive shell having transverse diaphrarns between and separating the explosive charge.
  • US Patent No. 383,223 to Graydon discloses an explosive shell containing separated explosive charges.
  • the charges are separated by transverse partitions which also may have perforations to conduct the flame between the charges.
  • US Patent No. 3,720,169 to Johnson et al discloses a projectile having two nose incendiary charges separated from one another by a partition disk.
  • US Patent No. 4,876,964 to Strandli et al discloses an incendiary containing projectile which has an interior coating or lining to prevent inadvertant ignition of the incendiary if the projectile is dropped.
  • This copper jacketed explosive bullet for penetrating light armor has an inner tubular hard heavy metal penetrator body filled with a high explosive. It has a nose portion forward of the penetrator which is filled with an incendiary material. The incendiary is designed to ignite upon target impact, in turn igniting the explosive after penetrating light armor. Around the outside of the penetrator and nose portion is an outer copper jacket which forms the final aerodynamic shape of the bullet.
  • the cause of the preignition is not the relative movement per se. It is due to the presence of small amounts of incendiary material between the jacket and the tubular body at the location of relative movement.
  • the incendiary material may frictionally cling to the jacket sidewall as a result of the charging operation. Under assembly pressures, the material may also flow into undesired locations where normal part tolerances provide an opening. The friction from relative movement, occuring during spin-up, ignites this small amount of incendiary which in turn ignites the main incendiary and/or explosive charge.
  • the present invention prevents preignition by providing a flexible seal ring partition between the tubular body and the jacket where the incendiary joins with the tubular body and the jacket, and by designing the seal ring to scrape the inner wall of the jacket during installation to remove residual incendiary material from the wall of the jacket.
  • the shape of the seal ring tends to guide itself during insertion into the jacket to ensure coaxial alignment of the seal ring with the jacket.
  • the seal ring of the present invention comprises a ring shaped plastic body generally symmetrical about a central axis.
  • the body has an outwardly flared front collar portion and an outwardly flared rear skirt portion which are integrally joined to a central tubular portion.
  • the central portion has an inwardly projecting curved lip protruding inward toward the central axis.
  • the curved lip has a smooth concave surface oriented forwardly toward the projectile nose.
  • the seal ring is designed to be installed within the jacket after the incendiary material is deposited in the nose end of the jacket and prior to the insertion of the tubular hard metal body containing the high explosive.
  • the seal ring is sized so as to frictionally fit into the projectile jacket.
  • the front collar portion is sufficiently large in diameter so that it is constricted during insertion within the jacket to scrape or swab along the inner wall of the jacket to remove any incendiary material which has adhered to the inner wall. Thus, all of the residual incendiary is moved to the forward, proper location during component assembly.
  • the front collar portion is also short enough in length so that the material of the collar does not wrinkle when it conforms to the inner wall of the jacket.
  • the rear skirt portion is sized slightly larger in diameter than the front collar portion so as to act like a shuttle cock during seal insertion. This keeps the seal in proper axial alignment.
  • the rear portion is also segmented or provided with cutout portions to avoid wrinkling when it is constricted during insertion.
  • the rear portion is sized to fit over the front end of the tubular body and is ultimately swaged between the tubular metal body and the jacket to seal this interface.
  • a central bore through the seal ring permits an incendiary interface with the high explosive charge to maintain continuity of the explosive train. The size of this bore may be varied to control the detonation efficiency by providing greater confinement of the high explosive.
  • Figure 1 is a longitudinal sectional view of a PIE projectile incorporating one preferred embodiment of the seal ring in accordance with the present invention.
  • Figure 2 is an enlarged view of a portion of the projectile in Figure 1.
  • Figure 3 is a separate rear end view of the seal ring shown prior to insertion into the projectile of Figure 1.
  • FIG 4 is a sectional view of the seal ring taken on the line 4-4 in Figure 3.
  • a PIE projectile 10, shown in Figure 1 preferably comprises a copper/zinc jacket 12, a hard metal tubular penetrator body 14 coaxially within the jacket 12, a base plug 16 closing the rear of the penetrator 14, a nose incendiary 18 in front of the penetrator 14, and a high explosive 20 packed within the penetrator 14. Behind the base plug 16 is a lead seal 22.
  • the penetrator 14 is preferably a tungsten alloy tubular body having the shape of a hollow cylinder tapered front and rear.
  • the penetrator 14 is preferably filled with .
  • a plasticised high explosive 20 which is designed to fragment the tubular penetrator 14 upon detonation.
  • the high explosive is preferably sufficient to fill at least 80% of the internal volume defined by the internal wall of the penetrator body.
  • the nose incendiary 18 is located immediately forward of the high explosive 20 and can project either partly within penetrator 14 as shown in Figure 1 or reside wholly forward of penetrator 14.
  • the nose incendiary 18 is designed to ignite when the projectile 10 impacts a target at a sufficient velocity and to thereby ignite the high explosive 20 after a sufficient amount of delay time for the penetrator 14 to pass through at least an initial layer of " target material. Accordingly, the high explosive will detonate and fragment the penetrator 14 behind the initial target layer.
  • a seal means is installed which precludes incendiary material from being trapped between the penetrator 14 and the inner wall surface of the copper jacket 12.
  • This seal means a flexible, generally circular seal ring 24 in accordance with the present invention, is installed between the penetrator 14 and the nose incendiary 18. It comprises a generally ring shaped body 26 which is inwardly compressible, outwardly resiliantly biased and which is symmetrical about a central longitudinal axis A.
  • the body 26 has an outwardly flared front collar portion 28 and an outwardly flared rear skirt portion 30 which are integrally joined to a central ring portion 32.
  • the central portion 32 has an inwardly projecting curved lip 34 protruding from its inner side toward the central axis.
  • the curved lip 34 is designed to form a smooth, curved forwardly concave surface against the incendiary material 18 when the seal ring 24 is installed into the jacket 12 so that no sharp breaks or corners are present against the incendiary material 18 to create a frictional pinching location during projectile assembly and during acceleration and spin up.
  • the interior front collar portion 28 of the seal ring 24 is accordingly sized to frictionally conform to the projectile jacket 12 interior profile and still maintain a smooth contour after insertion.
  • the ring 24 is designed to be installed within the jacket 12 after the incendiary material 18 is deposited -in the nose end of the jacket. It may be installed along with or prior to the insertion of the tubular hard metal body 14 containing the high explosive 20.
  • the front collar portion 28 of the seal ring 24 has a maximum outer diameter greater than the inside diameter of the jacket so that it flexibly engages with the inner wall surface of the jacket 12 during seal insertion to scrape or swab any residual incendiary material from the wall to ensure that there is no incendiary present on the wall when the penetrator 14 is inserted into the jacket 12. Thus, all of the residual incendiary material is moved to the proper forward location during assembly.
  • the front collar portion 28 is short enough in length so that the material of the collar uniformly deforms and does not wrinkle when it is compressed and constricted to conform to the inner wall surface of the jacket 12.
  • the rear skirt portion 30 is sized slightly larger than the collar portion 28 and has a maximum outer diameter greater than the inside diameter of the jacket 12 so as to act like a shuttle cock during seal insertion. This shape maintains the seal ring 24 in proper axial alignment.
  • the rear, portion 30 is also provided with cutout portions 36 to form segments to avoid wrinkling and/or unwanted material thickening when it is constricted during insertion.
  • the interior of the rear portion 30 is also sized to fit around the front end of the penetrator 14.
  • the rear skirt portion 30 is ultimately swaged between the tubular metal body of the penetrator 14 and the jacket 12 to seal this interface.
  • the curved lip 34 extends over the front end of the penetrator 14 so that the seal ring 24 presents a smooth contoured surface 38 in contact with the rear of the nose incendiary charge 18.
  • a central bore 40 through the seal ring 24 permits an interface between the incendiary 18 and the high explosive charge 20 to maintain continuity of the explosive train.
  • the size of bore 40 may be varied to control the detonation efficiency by providing greater or lesser confinement of the high explosive.
  • the base plug 16 preferably has a central blind bore 42 which contains a portion of the high explosive charge 20. This arrangement facilitates disintegration of the base plug upon explosive detonation.
  • the base plug is preferably made of sintered zirconium so that it fragments into many burning particles upon detonation.
  • the base plug 16 has an outwardly and forwardly flared front portion 44 which engages a tapered rear portion 46 of the tubular penetrator 14 so as to interlock the base plug 16 and penetrator 14 together.
  • the interface between the high explosive charge 20 and the incendiary charge 18 may be a flat transverse surface or preferably is a recessed, stepped surface 48 as shown in Figure 1. Such a recessed, stepped surface 48 presents a large surface area contact between the high explosive and the incendiary for efficient detonation.
  • the seal ring 24 is basically a swab to clean any residual incendiary material from the jacket as the seal or swab is passed through the jacket and lodged against the incendiary charge.
  • the penetrator 14, base plug 16, high explosive 20, and lead seal 22 are assembled together and then installed so that the forward end of the penetrator 14 butts against the flat rear of the curved lip 34 of the seal ring 24.
  • the rear portion 30 is swaged between the penetrator 14 and the jacket 12.
  • the seal ring 24 may be installed on the front end of the penetrator assembly first and then both inserted together into the jacket 12.
  • the recessed surface 46 may be filled with a partial charge of incendiary material prior to installation of the penetrator 14 in the jacket 12.
  • the rest of the incendiary material will already have been installed in the jacket as just described.
  • the seal ring 24 is preferably installed on the front end of the penetrator assembly containing the high explosive and the partial incendiary charge and then installed within the jacket 12.
  • the collar portion wipes or scrapes the inside of the jacket clean of incendiary material as it is inserted.
  • the jacket 12 is crimped over the rear of the lead seal 22 to complete the assembly of the projectile 10.
  • any relative movement between the penetrator 14 and the jacket 12 during acceleration or spin up in the weapon bore will not involve contact with the incendiary to cause premature detonation of the high explosive because of the presence of the seal ring 24.
  • This ring thus cushions the penetrator and partitions and prevents any contact between the incendiary and the front end of the penetrator. Further, the seal will desensitize the round to rough handling and dropping.
  • the seal ring 24 preferably has a relatively large central bore 40 therethrough so that the incendiary 18 has direct contact with the high explosive 20. In some applications, however, it may be desirable to restrict the size of the bore to provide a greater initial confinement of the high explosive hence, more efficient detonation. The detonation efficiency may be controlled by an appropriate choice of seal ring bore size.
  • the seal ring 24 is preferably made of a highly moldable material such as low density polyethylene.
  • a highly combustible material such as a moldable nitrocellulose material may also be used which can minimize the parasitic mass in the projectile.
  • the installed seal ring 24 also prevents particles of incendiary material from lodging between the front end of the penetrator and the jacket during storage, transport, and handling. This can substantially reduce the probability of ignitions due to mishandling and dropping the rounds. Further, the seal permits a more severe taper at the front end of the penetrator than would otherwise be permitted, as shown in Figure 2, which may be advantageous against some armor targets. While the invention has been described above with reference to specific embodiments thereof, it is apparent that many changes, modifications and variations can be made without departing from the inventive concept disclosed herein.
  • the penetrator may be solid or tubular and the projectile may or may not contain a high explosive charge.
  • the seal ring 24 may or may not have cutouts in the collar portion to prevent wrinkling as in the rear portion, thus allowing the collar portion to be longer, extending further between the incendiary 18 and the jacket 12 forward of the penetrator body 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Air Bags (AREA)
  • Credit Cards Or The Like (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

Projectile explosif amorcé pyrotechniquement (10) comportant, disposés coaxialement, une tête incendiaire (18), un noyau pénétrant (14), une matière hautement explosive (20), et une enveloppe globale (12). Un anneau d'étanchéité (24) est placé entre la tête incendiaire (18) et le noyau pénétrant (14) pour éviter un mouvement relatif entre le noyau et l'enveloppe (12) pendant le montage du projectile (10), l'accélération et l'entrée en rotation dues à un allumage prématuré de la charge incendiaire. L'anneau d'étanchéité (24) a une partie frontale en collier (28) qui, de préférence, a un diamètre plus grand que le diamètre intérieur de l'enveloppe (12) de sorte que le collier (28) racle la paroi intérieure de l'enveloppe (12) pendant l'insertion pour éliminer des résidus incendiaires afin qu'aucune matière incendiaire ne puisse se loger entre l'enveloppe (12) et le noyau pénétrant (14).
EP91909413A 1990-05-23 1991-04-22 Anneau etanche pour projectile amorce pyrotechniquement Expired - Lifetime EP0530241B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US52800990A 1990-05-23 1990-05-23
US528009 1990-05-23
US07/537,190 US5133259A (en) 1990-05-23 1990-06-12 Seal ring for pyrotechnically initiated projectile
PCT/US1991/002723 WO1991018227A1 (fr) 1990-05-23 1991-04-22 Anneau etanche pour projectile amorce pyrotechniquement
US537190 2000-03-29

Publications (3)

Publication Number Publication Date
EP0530241A1 true EP0530241A1 (fr) 1993-03-10
EP0530241A4 EP0530241A4 (en) 1993-06-30
EP0530241B1 EP0530241B1 (fr) 1996-08-14

Family

ID=27062582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91909413A Expired - Lifetime EP0530241B1 (fr) 1990-05-23 1991-04-22 Anneau etanche pour projectile amorce pyrotechniquement

Country Status (5)

Country Link
EP (1) EP0530241B1 (fr)
AU (1) AU7865291A (fr)
DE (1) DE69121404T2 (fr)
NO (1) NO177366C (fr)
WO (1) WO1991018227A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2738909B1 (fr) * 1995-09-15 1997-12-05 Giat Ind Sa Dispositif d'etancheite monte entre l'enveloppe et le culot d'un obus cargo
DE19700349C2 (de) * 1997-01-08 2002-02-07 Futurtec Ag Geschoß oder Gefechtskopf zur Bekämpfung gepanzerter Ziele

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2402018A (en) * 1943-03-11 1946-06-11 Remington Arms Co Inc Method of making incendiary bullets

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE572462A (fr) *
US2889183A (en) * 1955-12-07 1959-06-02 Renault Packing ring
DE1131561B (de) * 1960-06-11 1962-06-14 Diehl Fa Leuchtspurmunition
DE1240760B (de) * 1962-12-24 1967-05-18 Diehl Fa Panzerbrandgeschoss
NL175341C (nl) * 1970-10-28 1984-10-16 Eurometaal Nv Werkwijze voor het samenstellen van een uit een vuurwapen te verschieten kogel met een kern van hard materiaal, alsmede kogel vervaardigd onder toepassing van die werkwijze.
US4045055A (en) * 1974-02-13 1977-08-30 Olin Corporation Quick-connect coupling
AU2400477A (en) * 1976-04-30 1978-10-12 David P W Puchy Sealing device
US4625650A (en) * 1984-10-29 1986-12-02 Olin Corporation Multiple effect ammunition
JPS63232996A (ja) * 1987-03-20 1988-09-28 菱和株式会社 食品スライス機における可動スタツカ−

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2402018A (en) * 1943-03-11 1946-06-11 Remington Arms Co Inc Method of making incendiary bullets

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9118227A1 *

Also Published As

Publication number Publication date
NO924490L (no) 1992-11-20
NO924490D0 (no) 1992-11-20
EP0530241B1 (fr) 1996-08-14
DE69121404D1 (de) 1996-09-19
NO177366B (no) 1995-05-22
AU7865291A (en) 1991-12-10
NO177366C (no) 1995-08-30
EP0530241A4 (en) 1993-06-30
DE69121404T2 (de) 1997-03-27
WO1991018227A1 (fr) 1991-11-28

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